IN MY PREVIOUS articles off-water flying concentrated identifying ba sic requirements activity discussed flying sites retrieval systems design parameters peculiar water concluding suggestions several models con vert nicely seaplanes present article follows up dis cussion float design strut assembly hardware design installation ex plains several modifications necessary setting up seaplane Although air plane capable taking off landing water generically defined seaplane emphasis will floatplane conver sions brief nod flying boats broad terms lets identify what good seaplane ought addition being waterproof aircraft should stable dur ing normal landings takeoffs moderate wind conditions should plane little no up elevator able turn across wind burying float Flying boats often suffer re spect because tip floats both too small too high arangement al lows strong crosswinds pick up wing bury opposite float During takeoff landing runouts good seaplane design should exhibit no ten dency porpoise symptom large cut away angles and/or short heels Finally well-designed seaplane floats will properly aligned airstream minimizes frontal area impact cruising speed Floats Full-scale airplanes equipped require floats will support about twice gross weight float lengths average about 83% fuselage length positioned approximately 44% centerline centerline lengths apart steps vary 47% 53% float lengths Fuselage float lengths usually about equal singlefloat craft dimensions stack up model world Pretty well actually Model airplanes seem quite well float length 75% fuselage buoy ancy factor 80% 100% greater total model weight fliS close-up snows inree %e x s-in spruce skid fins installed step improve on-step turning flat-bottomed floats Perhaps tacky some eyes simple ex tension air rudder still makes very ef fective water rudder lower hinge air rudder must however reinforced der compensate added drag loads arrive proper float length given model youll need some draw ing plans airplane Drop line vertically down 40% mean aerody namic chord MAC point another point lying one-third prop diameter ahead prop Twice distance tween two lines becomes float length should come out fairly close 75% fuselage length Youll notice step will positioned little rear center-of-gravity some reason have compro mise move step forward centerof-gravity rather moving tips back now have enough data obtain floats will fit model havent flown off-water before yourself favor purchase first floats Once youve gained some experience have better feel sizing may want design own names addresses float man ufacturers see listings end article Sending card should get brochure evaluating literature main factors consider length corres ponding weight range engine sizes youre lucky cost finishing floats key successful seaplaning obtain ing floats right length Since floats designed considerable buoy ancy reserve theyre long enough theyll support airplane host other fac tors however such time ability cost appearance may influence choice floats youre short time Gee Bee Beck man Westphal have ready-made floats sure check weight within prescribed limits molded floats tend heavier built-up ones cov ered foam As ability can build model floats piece cakeprovided dont get carried away covering process Floats need heavy Whats heavy 31-in 44-plywood-covered foam floats including attach fittings cover ing paint weigh 15 oz carry Se-TEIN& ARM /- A-~x rxr WAT PDR U Fo AA WAThR PA/ETI 0rA 5OLP6~ T0 TO VIEW left good close-up shot kickup rudder Sea Seniorita right drawing describing parts con struction details kickup feature quite worthwile protecting rudder against submerged obstructions especially ground handling size water rudder could have little larger however will turn airplane adequately light wind conditions 94 Model Aviation Left Close-up simple effective spray rail important keeping spray away prop Its nothing piece plastic tape found Radio Shack discount store Its installed inboard front floats extend about 1/8 below chines Right Throt tle cable used controlling water rudder seen wired N strut Note float vent made Nyrod protruding hardback typicai water rudder installation tfle back ot tne TlOt singie rudder usuaiiy quite aa equate models Suggested rudder sizes various model sizes listed text 1 1 1OAT 5rkJT5I 4I4c Ji& Left Detail drawing fitting jig used assemble float struts jig important enables strut assembly built true straight Right assembled float struts mounted jig successful strut system must lightweight flexible yet strong niorita all-up weight 74 oz 40-in floats same configuration weigh 2 lb ready go carry 95-lb Super Kadet However have another set 40-in floats Kadet builtup yet still weigh 2 lb Covered foam has twin advantages easier construction being less prone leaks still weighing same built-ups What cost Balsa USA sells 30in set around $12 set source weighs 7 oz apiece com plete doped silkspan Formula U Since Theyre built-up floats must sealed carefully foam core kits will cost twice Balsa USA price build ing time cut half Finally plastic molded floats heaviest ex pensive completely ready go box water 29-in Beckmans weigh 30 oz cost $77 plus shipping Gee Bee offers much less expensive alter native about $30 33-in set Gee Bee floats dont look much like fullscale counterparts work well shouldnt discounted Speaking appearance some folks care assembled float struts Sea Senior ita shown still mounted fitting jig shadows photograph can cause little confusion wire diameters used particular size airplane struts % N struts October 1989 95 4INGJ 6 ht & Up screams low flyby model will plane almost instantly application power Its equipped 31-in floats meet 750/o-of-the fuselage-length-rule Close-up full-scale Capri 2550 floats mounted Cessna 172 showing spray deflec tor keeps water away propeller during takeoff Also note sway cables under fuselage walk-across engine off course cables stretched across float tips about others dont modelers demand scale-looking floats oth ers simply want get off water Most us lie somewhere middle sug gestion go set floats closely matches airplane question realism youll find some full-scale floats bit clunky own right Note example flat tops slab sides Capri floats Cessna 172 shown photos Yes floats V-bottomed surfaces too flat rather curved manner Edo Pee Kay have Citabria floats resem bling Edos would really dress up Like full-scale brothers model floats either slab-sided variety D______ -iEC PiZ4LLl have single-curvature tops bottom sur faces however usually flat ease construction quick planing well minimize ground handling abrasion Theres no question however V bottomed floats have good scale appearance track well takeoff addition land ings accompanied slap flat surfaces produce choice yours Covering instructions cluded floats float kit dont pro vide much information covering fol lowing supplementary material might useful Appropriate covering materials run gamut plywood glass-and-resin balsa sheet MonoKote doped silkspan Formula U Ive tried have found plas tic film lightest film does tend loosen up however step area must carefully sealed Also bot tom sheet should applied last can lapped up sides prevent water seeping under edge Doped silkspan final painting Formula U works quite well achieving al much lightness plastic film Attractive trim designs easily applied over silkspan Glass-and-resin probably dur able method has beautiful finish painted glassing try spreading thin layer epoxy surface rolling float onto glass Smooth out apply second coat epoxy dry trick start sanding before epoxy has totally hardened allowing excess roll off surface clogging paper everything finished little trim stripe can really dress up ugly float Continued page 191 FL5FLl&PORPIAM FLOAT LN&tI-i LFL simplified drawing can help determining size position angles dimensions particular installation Refer text details working out own calculations H 5TL/T HEIGHT k Fl-I F- FLOAT L-eNGTh$ 96 Model Aviation ne autnors aaughter Lee Ann noaing inc 35-lb Step-Up model equipped 30-in built-up floats covered Mono Kote floats including fittings weigh 11 oz Getting up step requires some up elevator particular airplane dual water rudder actuating system modified Super Kadet almost hidden Slimline Pius-style muffler Two water rudders necessary particular installation Completed struts mounted set Balsa USA 30-in floats glassed ready painting AMA District VI VP Burgin KY trusty Associate VP Ron Ballard Decatur IN both hand greet modelers AMA booth Jim presented South Bend RC Club AMA Award Service recognition its con tinued efforts staging Pot-O-Gold show recognition extraordinary nature its accomplishments plaque states Pot-O-Gold So much lit tle time Club President Ron Vander Molen accepted plaque behalf SBRC Club separate awards ceremony Jim Sears presented 25-Year Service Award plaque Tn-Valley RC Club Club president Bob Kyle accepted award TnValley South Bend RC groups sister clubs representing best interests mod elers both north south sides South Bend St Joseph County memberships span border area between AMA districts VI VII Throughout two-day show SBRC maintained solid frequency control coor dinated demonstration activity mishap occurred event coordinator constant contact scannerequipped control center D&J Electronics Howell MI also assisted frequency control during busy periods SBRC Club delighted receive participation four corners USA broad array dealers man ufacturers hobby-related businesses 75 alloccupying 118 booths state Washington California New York Florida represented Hazel Sig Hester promised display full-size Space Walker next year Midwest well known density its modeling popu lation considerable percentage resides within 150-mile radius South Bend demographics like SBRC Club poised greater growth its future Pot-O-Gold shows Floats-Fitti ngs/Westwood Continued page 96 Correct positioning floats model important Positioning must worked out before mounting fittings considered youll need re turn plans adding sketch made determine float length Starting airplanes prop its cor rect position take 15% prop diameter measure distance below bottom prop Draw line parallel longitudinal axis fuselage marks position top floats Seniorita using 10 x 4 10 x 5 prop top floats will 1 bottom prop An Eagle 63 turning 11 x 5 prop will require dis tance 1% Position step 40% MACor 40% chord wing rectangu lar everything done correctly youll have fairly conventional installation no surprises tips floats should about half little less prop di ameter forward prop Obviously farther forward bows better planing characteristics crucial point have enough float forward prop stopping short excessive amount Both Seniorita Light & Up have 31-in floats meet 75% rule application power no elevator control floats get plane almost im mediately task remains draw position hardbacks Most built-up floats will have internal hardbacks have type youre home free since can install spreaders anywhere please Exposed hardbacks used floats such Gee Bee require careful planning Though still allow consid erable adjustment youll need determine location exposed hardbacks beforehand draw Fittings can now considered almost designs fittings Newest Ailane Full Size Aerobatic World. .Now Available Three Size Model Kits EXTRA 230 Gtandoff Scala 33% 96 Span Wing Awe 1300 St 30% 87 Span Wing Am 117 sq 25% 75 Span Wing Aa 558 sq 229 1 $15 ship 219 I-i $l5shipl 179 hip October 1989 191 magnificently crafted tool reduces temperature drift 50 ciZ7~ THE BLACK BARON IRON Advanced hi-tech thermostat reduces temperature drift 50 Ordinary irons vary up 400 Exclusive roil bars fit fillets & under cambers Flat sole bevelled edges provides constant heat marks Coating 100% Blackstone big improvement over lessBoNus! expensive coatings slides almost noTwo stands adhesive ui1u ruy magnificent tooincluding j,j TI1ethat attaches iron Iont have CGVERE look 420 Babylon Rd Horsham PA 19044 100% Blackstone coating slides like butter Exclusive roll-bars roll fillets & undercambers responding advertisers mention read about ModelAviation G Duane Coles T- 199 1 SlOshipping R/C EXTRAS 1404 Vandenburg Cir W Sergeant Bluff IA 51054 Phone 1 712 943 4102 Cash Money Orden Ceditied Chenh VISA o \IZI1MasCad oceptdNo COD Odes lJ *PwyonM Cheohn two weeks HANGAR-7 R/C & C/L MODELS Proffesional Neans quality Results Cozoenpietre Lzit PreCut AAA Balsa & Ply PrePorned Landing Gear Spruce & Maple Bond PoIISone Rolled Plans Instructions Wheels Controls Etc Rot Included P1crcs PJnas Kitr ahove escept UCUT parts 00th handy teoplate cheet provided C P1nnas Otoly Foilsize rolled plans template sheet instractoons shlpped first class nail Free Catalog $59 $35 C $11 RIO cORSAIR 25 Distinctive lieU Wins Pavorite SemiScale Wong Span ii Wing Area iSO Sq Length 341/2 Loading II Sz/Sq Pt Weight 31/20 Engine 25 Co In. Radio iChannel Std B $25 C $7 B/C iJORtIET 074 Spurt Bipi. ~ldnl Wing Span 27 Bong Area 27i Sq In. Length 25 Loading 13 Sn Sq Pt. Weight 11/20 Engine 074 Coo Qaeen Bee Radio iChannel Micro Servos $49 B $30 C $9 B/C ALLcICAIi Ii AileronOF Spurt PlyrcI Wing Span Wing Area 375 sq on. LesEth 351/2 Weight 20 $25 C $9 Profile Fuselage & InsltUp Sheeted Wing Wing Span 58I/i Area 540 Sq In. Engi:e iS $39 $25 C $9 C/LI CESSNA AEROBAT 35 Enique lepreunive Sight Profile Faselage & Boiltip Sheeted Wing wing Span 52 Area iii Sq togise 35 Stunt C/LI hEIR 2 ecU Plyer/Tcaieect ciScUp Sheeted Wiogs selage Wing Span$ 1 3 II Area 200 Sq Engine 15 Cu In ntroductory prices above good until Oct 1 1989 ORDER YOURS TODAY Pleane add $4 shipping & handling 3 Send chech money order VISA & MC accepted Gice sreet addrons kiln nod phone credit cardt GEL ENTERPRISES P Q BOX 336 PB 414 5454172 WAUKESHA WISCONSIN 53187-0336 MEMBEREAA AC models real key simplic ity Simple fittings properly made will give maximum lightness strength have attractive appear ance major differences between fullscale model fittings model float fit tings down struts N drag struts spreaders normally designed flexible enough withstand bending loads whereas full-scale fittings spread ers made withstand bending manned water flight wheeled dolly picks up entire aircraft using two pad ded rails slipped under spreaders just board floats hollow extruded alu minum spreaders filled wood ex panded foam simply keep col lapsing during ground handling fullscale down struts N struts pinjointed can carry tension com pression loads Side loads carried cable cross bracing Another cable stretched across front bollards serves footbridge afloat engine off course Since full-scale installation rigid need V bottomed configuration floats comes obvious float-equipped models down struts one-piece designed carry side loads N struts carry drag loads just full-scale applications spreaders holding floats parallel resisting separation loads Youll probably struck apparent flimsiness frame attaches floats model never cease amazed much system flexes both during ground handling water thats what makes work rigid youd breaking something time made not-so-gentle landings wed rather talk about As stuff get away envy full-scale operator Using back plans sketch fuselage cross section wing lead ing edge Draw float tops below fuselage centerlines floats should positioned half length apart Determine location hardbacks floats equipped sketch Draw down strut have ready-made floats attachfitting stock begin taking measure ments point fittings provided can t bent fit drawing make new ones Dont pressured working wrong size fittings just because came kit high-wing planes rear strut usually same dimension front positioned about three-fourths wing chord back Sig Cub excep tion its rear strut slightly longer fuselage bottom isnt horizontal between front rear down struts youll have draw another fuselage cross section rear strut attaches fashion slightly different rear strut Now comes fun part bending wire making struts use 5A2-dia wire planes under 3 lb %-dia air192 Model Aviation planes up 6 lb %2-dia wire ships up 10 lb quarter-scale machine like Cub will require Y18-dia wire must heated sufficient pliability Heat ing wire takes temper out bend doesnt seem create prob lems 40-size plane requires A-dia wire single 36-in-long piece will enough both struts After cutting wire Dremel cut off wheel marking masking tape move big vise hammer Using cardboard template made draw ings start banging pulling wire about six inches bend check bend against pattern usually overbending slightly pull back eliminate residual stresses Continuing other bends similar fashion end up two custom-made down struts make N struts wire size smaller used down struts larger size isnt necessary drag loads spreaders made out same-diameter wire down struts can wrapped No 24 copper wire soldered directly across bot toms prefer put bends end just inboard flats way rear N strut can wrapped si multaneously rear spreader Another type spreader prefer arrow shaft available several diameters 32 long use 4-in-dia shafts small planes /lh-dia shafts 40 through 60-size ma chines Fiberglass shafts virtually inde structible after drilling holes fit ting struts Fabrication sequence Review accom panying drawings familiarize yourself assembly procedure using ar row shaft spreader cut shafts spreader width Airplanes 40-size range usually take 16-in spreaders both spreaders can made shaft Drill holes down strut axles MAJERIOG catalog .a -$100 wS-- ff43LU1 RIDGE nnaa Hurricane VVV 25528 MACIUNERY& TOOLS P0 Boa 536-Y Lj 304-562-3538 otter complete selBctiOn lathes mills tools Aviation Modeler THE WIREMASTER em benderbooder extra large handle bends 1/81/4 coils 5/ 32-3/16 music wire Wire creep eliminated ANTI-KREEP WIRE LOCK free catalog has hundreds new items free micro bender offer JCM COMPANY 114 Washington Tert Waukegan IL 60085 Ii L:v Thone Aecnhat -ccscceosecane & inlid Ralsa Wiogs Wnng spat: 253/h aria 300 40 In. Engine 15 Co ends Twist drill elongate holes slit end shaft cut off wheel working hole partway edge File some notches axle ar eas down struts put tufts cot ton shafts just inboard holes Slide axle end hole has slit grasping firmly bend strut inserting other axle slit hole may find necessary bevel top axle aid insertion Mix up batch JB Weld warm up joint heat gun Using piece wire small nail coax JB Weld joint JB going argue rest assured itll go Put piece masking tape over end fit re maining axles using same procedure point youll need build fitting jig absolutely essential getting whole assembly straight Follow gen eral dimensions accompanying draw ing jig can made about 20 min utes table saw Lock spreader assemblies place jig fit solder N struts Since critical part job its important take time cer tain struts fit binding before wrapping soldering use coat hanger make master hangers bend easily course can afford waste couple getting shape just right youre completely satisfied use master pattern guide cutting bending N struts spreader assemblies still locked jig buff solder areas N strut ends wrap place No 24 copper wire Youll need about 20 copper wire joint Use sol dering gun torch intense heat torch would deposit carbon joint keep solder sticking After cleaning up soldered joints strut sembly ready mounting onto floats effective mounting method Please send 1 current ha catalog hating kite accessories Walt Moucha ModelsPO Box 1 12A 906-863-1225 e Menominee Ml 49858 WOSLOS 0100057 SCALE PHOTO OSSOtOS 000 0100 SACOS PLANS 3 vIEWS PLANS ENLAHONG SASE 5n1relfle 500*0 Jim Popinos Catalog 400 60 paqeSCALE PlANS ad PHOTO SEHOICE 3209 Mdtson GeenobOO NC 27403 phone ss2925239 NO collect Bob FiorenzeI Hobby Center Inc Dealer Yellow Aircraft Complete Line Mail Order Hobby Suppliea Now eveilable Feetoover Covering Materiel Visit Showroom 135 mm Disney WorIdi OmegalCool Power Fuels Discounted____ 420 Weet SR 434-407 3274353 winter Springe FL 32705 Fax 407 327-7143 place floats board lock down position strut assembly floats Attach latter small strapsor have exposed hardbacks through prepared holes Securing entire assembly airplane simply matter screwing appropriate size landing gear straps over down struts fu selage always mount strut first back out screws fill holes cyano acrylate CyA glue resecure screws Water rudders Whether airplane steers nose wheel taildragger making water rudders easy part former case replace nose wheel stub shaft extends 1/2 below fuselage install another steering arm Run length throttle cable steering arm along nose down N strut along length float tail-dragger hook length throttle cable rudder horn attach fuselage small aluminum clips tape Bend sleeve down past rear down strut along float securing two landing gear straps An extension below air rudder makes simplest water ruddersomewhat tackylooking effective 40-size model will require 3A2-dia wire reinforced lower air rudder hinge have subrudder make double duty running shaft extension through lower bearing reduce drag loads lower hinge air rudder kickup feature shown accompa nying drawing worth effort takes make allows rudder trail water kick up obstructions ground handling Goldberg Cub float kit incorporates feature Perhaps sufficient pressure readers Gold berg company might agree package sep arately modelers using different size floats Williams Brothers makes very small kickup unit must reworked operate freely requires steering arm extension make water rudder need A-in Du-Bro Goldberg nose wheel steer ing block stub shaft collar another arm little brass stock John Sullivan sug gests following rudder sizes matched indicated airplane sizes will effective job steering model through water 125 sq-in rudder 20-size planes 225 sq 40 325 sq 60 4 sq 90 45 sq in for 12-size models Although fullscale airplanes equipped two water rudders wont see paired installa tions models However should de cide use two rudders order improve turning moment use sizes indicated above Last Hints Department waterproof ing apply finger fillet clear silicone along juncture fuselage stabi lizer little around hinges Dont use silicone around steel struts its youre using may well kiss nuts goodbye ZAP LOCI ultimate thread-locking compound \MDrks metal wood plastic combination surlces Available ri medium blue label high green label strength ZAP THE TOTAL ADHESIVE SYSTEM pacer d Calbrida iSA PRODUCTS FOR ThE DISCERNING MODELER Complete Line Exhaust Systems d Pipes Muffled Tuned P10cm Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems IinsupaSi Woi October 1989 193 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX AH Designs61 AMA Membership13 Ace Radio Control11 Aerospace Composite Prod22 Aerotrol46 Air Flair20 Airline Supply Co50 Airtronics2 174 AI-Tec & Su-Pr-Line182 Altech Marketing175 177 Coy 3 American Sailplane Des162 B&P Associates4 BLB178 Quay Barber Models165 Big Sky153 Blue Ridge Mach & Tools192 Bolar Heli Research45 Bridi Aircraft9 Bru Line Industries61 Byron Originals22 83 183 CH Electronics46 Campbell Tools Co190 Campbells Custom Kits146 Carroll Consulting157 Channel 1 Productions165 Chicago Model Hobby Show181 Cleveland Model Supply12 Composite Aircraft Eng49 Control Systems Labs51 Coverite191 Cox Hobbies148 Craftsman Models Inc180 Crenshaw Aero57 Culpepper Models Inc188 Cygnet Software20 D&R Aircraft Mfg55 DGA Designs169 Doylejet190 Du-Bro Products Inc21 Duracraft180 E&G Enterprises184 Elden-Ken Electronics180 FHS Supply Inc18-19 Farnsworth & Elroy158 Fiorenze Hobby Center192 Fitzpatrick53 Flights Fancy Aeromodel188 Flyline Models .16 Fourmost Products178 Fults Dual Struts148 Futaba Corp America98-99 G&A Products 190 G&P Sales49 GM Precision Products180 Gas Model Products182 Gator RC Products166 Carl Goldberg Models23 92 Golden Gate Hobbies163 Philip Good Engine Repair10 Gorham Model Products12 Great American Hobbies16 Great Planes84 Paul K Guillow Inc59 High Sky163 Harry Higley & Sons189 Hobby Barn150-151 Hobby Dynamics17 105 179 Hobby Horn10 Hobby Lobby International 70-173 Hobby Woods57 Bob Holman Plans182 Hotel Harrington53 Ikon Northwest Co16 Indy RC Sales Inc154-156 JCM Company193 JR Radios105 179 JTec59 Larry Jolly Model Products51 Jomar20 K&B Mfg146 K&S Engineering153 Kalt17 Kingsway Enterprises167 Kraft Midwest162 Kustom Kraftsmanship164 Lone Star Models149 MACS Products193 MGA Enterprises57 Maral Technologies33 McDaniel RC Service55 Memphis Bell Classic190 Jim Messers176 Micro Mark6-7 Midwest Products. 1 Model Products Corp166 Model Rectifier CorpCoy 2 Walt Moucha Models193 Mutchlers Hobbies160-161 Nor-Ray Products Inc55 Northeast Aerodynamics4 Northeast Screen Graphics49 Pacer Tech97 176 188 193 Parrish Aircraft178 Pattern Tek168 John Peck Leisure Prod45 Peck-Polymers59 Penn Valley Hobby Center190 Perkins Avionics 148 Pica Products Plane Video 16 Planes & Things 168 Plasti-Kote Polks Hobby 90-91 Progress Mfg Co 44 QSAA 159 RAM59 RC Buyers Guide189 RC Designs 184 RC Extras191 RC Soaring Digest164 RJL Industries22 Radio South47 Ragan/Barker Group152 Red Max Fuel18-19 Robart37 Robbe Model Sport8 Rons Model Building12 Roun Tuit61 SAC 8 SR Batteries Safety Plus 4 22 Satellite City15 Scale Glider Components158 Scale Model Research192 Scale Plans & Photo Ser193 Sceptor Models32 Sermos RC Snap Connectors10 Shamrock Competition Imports47 Sheldons Hobby Shop20 Sig Mfg Co59 106-107 195 Bob Smith Industries46 163 Stangel Enterprises192 Star Kraft170 Superior Aircraft50 Sure Flite49 Suretech61 T&D Fiberglass Spec157 Tatone Products Co57 Tidewater Hobby Enterprises53 Todays Hobbies Inc45 Top Flite Models Inc108 Tower Hobbies185-187 Tru-Turn146 VL Products 12 WE Technical Services195 WW Models169 Wandit Mfg153 Williams Brothers167 Windsor Propeller Co37 World EnginesCover 4 Zenith Aviation5 very corrosive Skid fins battens flat-bottomed floats extending steps forward couple inches will give water rudder better leverage turning Spray rails deflect water inside bottom float away prop plastic tape find discount stores Radio Shack works very well Put strip along inboard fronts trim ex tend below chines Although four-stroke engines quite well prefer two-strokes because give better power-to-weight ratio Since long low-pitch props available wood theyre kind use Though chip two average season Ive found can trim off tip rebalance prop little loss fact discovered best prop 61 long-stroke acci dent cut /2 off 14 x 5 RevUp prop following prop/two-stroke matchups work best 10 x 4 20size engines 11 x 5 cut down 10 x 5 25 engines 11 x 5 12 x 4 can find 35-to-40 engines 13 x 5 14 x 5 cut down 13 x 5 60-size 194 Model Aviation engines however use Master Airscrew 10 x 6 North Star because length constraints after following suggestions find plane still wont lift off less 100 ft first make certain youre using seaplane prop isnt problem try following 1 remove little downthrust present 2 Put small shims under front down struts raise nose slightly youll see fullsize installations quite often offset power loss added weight drag floats causes 3 Go engine size larger always good idea first start building Very light planes like Seniorita will fly beautifully K&B 20 Sportster relatively heavy planes like Aero Stars really require big ger engine Ill wager once youve brought floatplane taxied right up shore youll wonder took long Go Model Float Manufacturers Ace R/C 116W t9th St PO Box 511 Higginsville MO 64037 Balsa USA PO Box 164 Marinette WS 54143 Beckman Floats Hobby Lobby Interna tional 5615 Franklin Pike Circle Brentwood TN 37027 Bill Westphal Floats Float Place 6301 234th Place SW Mountain Lake Ter race WA 98043 Carl Goldberg Models Inc 4734 West Chicago Ave Chicago IL 60651 Gee Bee Products PO Box 18 E Longmeadow MA 01028 Great Planes Model Mfr Co PO Box 721 Urbana IL 61801 John Sullivan Model Floatplane Products 1421 Second Street Callistoga CA 94515 Lens RC Enterprises Box 214 Mon trose BC Canada VOG lPO Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 sI KHAMPION 2-STROV IEK PINTQUART GALLON 0% Nitromethane $1075 5% Nitromethane $365$525$1275 10% Nitromethane $415$550$1475 15% Nitromethane $430$635$1675 25% Nitromethane $515$795$2195 35% Nitromethane $595$925$2695 10% Nitromethane$1425 15% Nitromethane$1625 -*/rn over 20 years SIG has blending finest quality model engine fuel available using st quality ingredients instance anol use 995% pure very best grade W money can buy also use real 100% pure t Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tam 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourself Prices subject change notice See aealer first available order direct Call _____ 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO IA 50171 Etfinger * says OnlyPlane Petterove Sets give assorted designs yoc WOt have selectod best classic dodges time noose choose fsm patfens tsr pan ae importans coclusive feature Golden Age Y Scale curtisa Hawk~ ength wingspan 2266 sq iv wing area 323 engines -4 channel RIC RCOS-14 8 /e Scale cuntiss Falcon I- \IA-A-J 83 length wing spae WI- 3t66sqinwingaea4ch RIG/ Y RCQS-t3 5 116 Scale cessna ing span sq wing area 26 66 engiens 43-4 channel RIG RC6S-t 8 113 Scale Piper cub J-3 11-9 wing span ength 2856 sq wing area 26 30 cid engines annel RIG RC3S-2 8 Quarter Scale WW SE-SA go wing span sq wing area 78 22 engines gCOS7 5 SPAD c-xlll 78 Ye spas 6 5s wing nine 13 1031 engines Capable flynt-it captores iwaginanion RCO6-8 5 FOKKER DR-i TRIPLANE 72 wing span sq wing area 78 166 engines RCOS-8 82495 SOPWITH CAMEL F1 84 wingspan 2t66 sq wisgareaett lhswloRIC Py wood ft balsa conettoction use 6$ sq 601 drawings RCOStt 5 N eWPiper Tn-Pacer PA-22 t 16-318 wing span sq wing area 20 30 cid esgines 4-h channel RIG nc t2 lbs 81116 scetall length Plswoodlbalsu fulselage removeable wing poonlo steerable nose wheel designed fo easy ground handling autbeotic scale tlight portormanve $C3S36299$ aill Effinger Feaediee Meerbar AMA NFFS Halt e$ Fame Prices $or camplele plans sub assembly aed detailed parts lists Add 8250 fee Mailing Tube Send ter brechure ahead 01 thu vrowd new boohun showing new Plan Sets 101986 Send St refundable 1st orderl WE TECHNICAL SERVICES PO Box 76884-A Atlanta GA 30328 October 1989 195
Edition: Model Aviation - 1989/10
Page Numbers: 93, 94, 95, 96, 191, 192, 193, 194, 195
IN MY PREVIOUS articles off-water flying concentrated identifying ba sic requirements activity discussed flying sites retrieval systems design parameters peculiar water concluding suggestions several models con vert nicely seaplanes present article follows up dis cussion float design strut assembly hardware design installation ex plains several modifications necessary setting up seaplane Although air plane capable taking off landing water generically defined seaplane emphasis will floatplane conver sions brief nod flying boats broad terms lets identify what good seaplane ought addition being waterproof aircraft should stable dur ing normal landings takeoffs moderate wind conditions should plane little no up elevator able turn across wind burying float Flying boats often suffer re spect because tip floats both too small too high arangement al lows strong crosswinds pick up wing bury opposite float During takeoff landing runouts good seaplane design should exhibit no ten dency porpoise symptom large cut away angles and/or short heels Finally well-designed seaplane floats will properly aligned airstream minimizes frontal area impact cruising speed Floats Full-scale airplanes equipped require floats will support about twice gross weight float lengths average about 83% fuselage length positioned approximately 44% centerline centerline lengths apart steps vary 47% 53% float lengths Fuselage float lengths usually about equal singlefloat craft dimensions stack up model world Pretty well actually Model airplanes seem quite well float length 75% fuselage buoy ancy factor 80% 100% greater total model weight fliS close-up snows inree %e x s-in spruce skid fins installed step improve on-step turning flat-bottomed floats Perhaps tacky some eyes simple ex tension air rudder still makes very ef fective water rudder lower hinge air rudder must however reinforced der compensate added drag loads arrive proper float length given model youll need some draw ing plans airplane Drop line vertically down 40% mean aerody namic chord MAC point another point lying one-third prop diameter ahead prop Twice distance tween two lines becomes float length should come out fairly close 75% fuselage length Youll notice step will positioned little rear center-of-gravity some reason have compro mise move step forward centerof-gravity rather moving tips back now have enough data obtain floats will fit model havent flown off-water before yourself favor purchase first floats Once youve gained some experience have better feel sizing may want design own names addresses float man ufacturers see listings end article Sending card should get brochure evaluating literature main factors consider length corres ponding weight range engine sizes youre lucky cost finishing floats key successful seaplaning obtain ing floats right length Since floats designed considerable buoy ancy reserve theyre long enough theyll support airplane host other fac tors however such time ability cost appearance may influence choice floats youre short time Gee Bee Beck man Westphal have ready-made floats sure check weight within prescribed limits molded floats tend heavier built-up ones cov ered foam As ability can build model floats piece cakeprovided dont get carried away covering process Floats need heavy Whats heavy 31-in 44-plywood-covered foam floats including attach fittings cover ing paint weigh 15 oz carry Se-TEIN& ARM /- A-~x rxr WAT PDR U Fo AA WAThR PA/ETI 0rA 5OLP6~ T0 TO VIEW left good close-up shot kickup rudder Sea Seniorita right drawing describing parts con struction details kickup feature quite worthwile protecting rudder against submerged obstructions especially ground handling size water rudder could have little larger however will turn airplane adequately light wind conditions 94 Model Aviation Left Close-up simple effective spray rail important keeping spray away prop Its nothing piece plastic tape found Radio Shack discount store Its installed inboard front floats extend about 1/8 below chines Right Throt tle cable used controlling water rudder seen wired N strut Note float vent made Nyrod protruding hardback typicai water rudder installation tfle back ot tne TlOt singie rudder usuaiiy quite aa equate models Suggested rudder sizes various model sizes listed text 1 1 1OAT 5rkJT5I 4I4c Ji& Left Detail drawing fitting jig used assemble float struts jig important enables strut assembly built true straight Right assembled float struts mounted jig successful strut system must lightweight flexible yet strong niorita all-up weight 74 oz 40-in floats same configuration weigh 2 lb ready go carry 95-lb Super Kadet However have another set 40-in floats Kadet builtup yet still weigh 2 lb Covered foam has twin advantages easier construction being less prone leaks still weighing same built-ups What cost Balsa USA sells 30in set around $12 set source weighs 7 oz apiece com plete doped silkspan Formula U Since Theyre built-up floats must sealed carefully foam core kits will cost twice Balsa USA price build ing time cut half Finally plastic molded floats heaviest ex pensive completely ready go box water 29-in Beckmans weigh 30 oz cost $77 plus shipping Gee Bee offers much less expensive alter native about $30 33-in set Gee Bee floats dont look much like fullscale counterparts work well shouldnt discounted Speaking appearance some folks care assembled float struts Sea Senior ita shown still mounted fitting jig shadows photograph can cause little confusion wire diameters used particular size airplane struts % N struts October 1989 95 4INGJ 6 ht & Up screams low flyby model will plane almost instantly application power Its equipped 31-in floats meet 750/o-of-the fuselage-length-rule Close-up full-scale Capri 2550 floats mounted Cessna 172 showing spray deflec tor keeps water away propeller during takeoff Also note sway cables under fuselage walk-across engine off course cables stretched across float tips about others dont modelers demand scale-looking floats oth ers simply want get off water Most us lie somewhere middle sug gestion go set floats closely matches airplane question realism youll find some full-scale floats bit clunky own right Note example flat tops slab sides Capri floats Cessna 172 shown photos Yes floats V-bottomed surfaces too flat rather curved manner Edo Pee Kay have Citabria floats resem bling Edos would really dress up Like full-scale brothers model floats either slab-sided variety D______ -iEC PiZ4LLl have single-curvature tops bottom sur faces however usually flat ease construction quick planing well minimize ground handling abrasion Theres no question however V bottomed floats have good scale appearance track well takeoff addition land ings accompanied slap flat surfaces produce choice yours Covering instructions cluded floats float kit dont pro vide much information covering fol lowing supplementary material might useful Appropriate covering materials run gamut plywood glass-and-resin balsa sheet MonoKote doped silkspan Formula U Ive tried have found plas tic film lightest film does tend loosen up however step area must carefully sealed Also bot tom sheet should applied last can lapped up sides prevent water seeping under edge Doped silkspan final painting Formula U works quite well achieving al much lightness plastic film Attractive trim designs easily applied over silkspan Glass-and-resin probably dur able method has beautiful finish painted glassing try spreading thin layer epoxy surface rolling float onto glass Smooth out apply second coat epoxy dry trick start sanding before epoxy has totally hardened allowing excess roll off surface clogging paper everything finished little trim stripe can really dress up ugly float Continued page 191 FL5FLl&PORPIAM FLOAT LN&tI-i LFL simplified drawing can help determining size position angles dimensions particular installation Refer text details working out own calculations H 5TL/T HEIGHT k Fl-I F- FLOAT L-eNGTh$ 96 Model Aviation ne autnors aaughter Lee Ann noaing inc 35-lb Step-Up model equipped 30-in built-up floats covered Mono Kote floats including fittings weigh 11 oz Getting up step requires some up elevator particular airplane dual water rudder actuating system modified Super Kadet almost hidden Slimline Pius-style muffler Two water rudders necessary particular installation Completed struts mounted set Balsa USA 30-in floats glassed ready painting AMA District VI VP Burgin KY trusty Associate VP Ron Ballard Decatur IN both hand greet modelers AMA booth Jim presented South Bend RC Club AMA Award Service recognition its con tinued efforts staging Pot-O-Gold show recognition extraordinary nature its accomplishments plaque states Pot-O-Gold So much lit tle time Club President Ron Vander Molen accepted plaque behalf SBRC Club separate awards ceremony Jim Sears presented 25-Year Service Award plaque Tn-Valley RC Club Club president Bob Kyle accepted award TnValley South Bend RC groups sister clubs representing best interests mod elers both north south sides South Bend St Joseph County memberships span border area between AMA districts VI VII Throughout two-day show SBRC maintained solid frequency control coor dinated demonstration activity mishap occurred event coordinator constant contact scannerequipped control center D&J Electronics Howell MI also assisted frequency control during busy periods SBRC Club delighted receive participation four corners USA broad array dealers man ufacturers hobby-related businesses 75 alloccupying 118 booths state Washington California New York Florida represented Hazel Sig Hester promised display full-size Space Walker next year Midwest well known density its modeling popu lation considerable percentage resides within 150-mile radius South Bend demographics like SBRC Club poised greater growth its future Pot-O-Gold shows Floats-Fitti ngs/Westwood Continued page 96 Correct positioning floats model important Positioning must worked out before mounting fittings considered youll need re turn plans adding sketch made determine float length Starting airplanes prop its cor rect position take 15% prop diameter measure distance below bottom prop Draw line parallel longitudinal axis fuselage marks position top floats Seniorita using 10 x 4 10 x 5 prop top floats will 1 bottom prop An Eagle 63 turning 11 x 5 prop will require dis tance 1% Position step 40% MACor 40% chord wing rectangu lar everything done correctly youll have fairly conventional installation no surprises tips floats should about half little less prop di ameter forward prop Obviously farther forward bows better planing characteristics crucial point have enough float forward prop stopping short excessive amount Both Seniorita Light & Up have 31-in floats meet 75% rule application power no elevator control floats get plane almost im mediately task remains draw position hardbacks Most built-up floats will have internal hardbacks have type youre home free since can install spreaders anywhere please Exposed hardbacks used floats such Gee Bee require careful planning Though still allow consid erable adjustment youll need determine location exposed hardbacks beforehand draw Fittings can now considered almost designs fittings Newest Ailane Full Size Aerobatic World. .Now Available Three Size Model Kits EXTRA 230 Gtandoff Scala 33% 96 Span Wing Awe 1300 St 30% 87 Span Wing Am 117 sq 25% 75 Span Wing Aa 558 sq 229 1 $15 ship 219 I-i $l5shipl 179 hip October 1989 191 magnificently crafted tool reduces temperature drift 50 ciZ7~ THE BLACK BARON IRON Advanced hi-tech thermostat reduces temperature drift 50 Ordinary irons vary up 400 Exclusive roil bars fit fillets & under cambers Flat sole bevelled edges provides constant heat marks Coating 100% Blackstone big improvement over lessBoNus! expensive coatings slides almost noTwo stands adhesive ui1u ruy magnificent tooincluding j,j TI1ethat attaches iron Iont have CGVERE look 420 Babylon Rd Horsham PA 19044 100% Blackstone coating slides like butter Exclusive roll-bars roll fillets & undercambers responding advertisers mention read about ModelAviation G Duane Coles T- 199 1 SlOshipping R/C EXTRAS 1404 Vandenburg Cir W Sergeant Bluff IA 51054 Phone 1 712 943 4102 Cash Money Orden Ceditied Chenh VISA o \IZI1MasCad oceptdNo COD Odes lJ *PwyonM Cheohn two weeks HANGAR-7 R/C & C/L MODELS Proffesional Neans quality Results Cozoenpietre Lzit PreCut AAA Balsa & Ply PrePorned Landing Gear Spruce & Maple Bond PoIISone Rolled Plans Instructions Wheels Controls Etc Rot Included P1crcs PJnas Kitr ahove escept UCUT parts 00th handy teoplate cheet provided C P1nnas Otoly Foilsize rolled plans template sheet instractoons shlpped first class nail Free Catalog $59 $35 C $11 RIO cORSAIR 25 Distinctive lieU Wins Pavorite SemiScale Wong Span ii Wing Area iSO Sq Length 341/2 Loading II Sz/Sq Pt Weight 31/20 Engine 25 Co In. Radio iChannel Std B $25 C $7 B/C iJORtIET 074 Spurt Bipi. ~ldnl Wing Span 27 Bong Area 27i Sq In. Length 25 Loading 13 Sn Sq Pt. Weight 11/20 Engine 074 Coo Qaeen Bee Radio iChannel Micro Servos $49 B $30 C $9 B/C ALLcICAIi Ii AileronOF Spurt PlyrcI Wing Span Wing Area 375 sq on. LesEth 351/2 Weight 20 $25 C $9 Profile Fuselage & InsltUp Sheeted Wing Wing Span 58I/i Area 540 Sq In. Engi:e iS $39 $25 C $9 C/LI CESSNA AEROBAT 35 Enique lepreunive Sight Profile Faselage & Boiltip Sheeted Wing wing Span 52 Area iii Sq togise 35 Stunt C/LI hEIR 2 ecU Plyer/Tcaieect ciScUp Sheeted Wiogs selage Wing Span$ 1 3 II Area 200 Sq Engine 15 Cu In ntroductory prices above good until Oct 1 1989 ORDER YOURS TODAY Pleane add $4 shipping & handling 3 Send chech money order VISA & MC accepted Gice sreet addrons kiln nod phone credit cardt GEL ENTERPRISES P Q BOX 336 PB 414 5454172 WAUKESHA WISCONSIN 53187-0336 MEMBEREAA AC models real key simplic ity Simple fittings properly made will give maximum lightness strength have attractive appear ance major differences between fullscale model fittings model float fit tings down struts N drag struts spreaders normally designed flexible enough withstand bending loads whereas full-scale fittings spread ers made withstand bending manned water flight wheeled dolly picks up entire aircraft using two pad ded rails slipped under spreaders just board floats hollow extruded alu minum spreaders filled wood ex panded foam simply keep col lapsing during ground handling fullscale down struts N struts pinjointed can carry tension com pression loads Side loads carried cable cross bracing Another cable stretched across front bollards serves footbridge afloat engine off course Since full-scale installation rigid need V bottomed configuration floats comes obvious float-equipped models down struts one-piece designed carry side loads N struts carry drag loads just full-scale applications spreaders holding floats parallel resisting separation loads Youll probably struck apparent flimsiness frame attaches floats model never cease amazed much system flexes both during ground handling water thats what makes work rigid youd breaking something time made not-so-gentle landings wed rather talk about As stuff get away envy full-scale operator Using back plans sketch fuselage cross section wing lead ing edge Draw float tops below fuselage centerlines floats should positioned half length apart Determine location hardbacks floats equipped sketch Draw down strut have ready-made floats attachfitting stock begin taking measure ments point fittings provided can t bent fit drawing make new ones Dont pressured working wrong size fittings just because came kit high-wing planes rear strut usually same dimension front positioned about three-fourths wing chord back Sig Cub excep tion its rear strut slightly longer fuselage bottom isnt horizontal between front rear down struts youll have draw another fuselage cross section rear strut attaches fashion slightly different rear strut Now comes fun part bending wire making struts use 5A2-dia wire planes under 3 lb %-dia air192 Model Aviation planes up 6 lb %2-dia wire ships up 10 lb quarter-scale machine like Cub will require Y18-dia wire must heated sufficient pliability Heat ing wire takes temper out bend doesnt seem create prob lems 40-size plane requires A-dia wire single 36-in-long piece will enough both struts After cutting wire Dremel cut off wheel marking masking tape move big vise hammer Using cardboard template made draw ings start banging pulling wire about six inches bend check bend against pattern usually overbending slightly pull back eliminate residual stresses Continuing other bends similar fashion end up two custom-made down struts make N struts wire size smaller used down struts larger size isnt necessary drag loads spreaders made out same-diameter wire down struts can wrapped No 24 copper wire soldered directly across bot toms prefer put bends end just inboard flats way rear N strut can wrapped si multaneously rear spreader Another type spreader prefer arrow shaft available several diameters 32 long use 4-in-dia shafts small planes /lh-dia shafts 40 through 60-size ma chines Fiberglass shafts virtually inde structible after drilling holes fit ting struts Fabrication sequence Review accom panying drawings familiarize yourself assembly procedure using ar row shaft spreader cut shafts spreader width Airplanes 40-size range usually take 16-in spreaders both spreaders can made shaft Drill holes down strut axles MAJERIOG catalog .a -$100 wS-- ff43LU1 RIDGE nnaa Hurricane VVV 25528 MACIUNERY& TOOLS P0 Boa 536-Y Lj 304-562-3538 otter complete selBctiOn lathes mills tools Aviation Modeler THE WIREMASTER em benderbooder extra large handle bends 1/81/4 coils 5/ 32-3/16 music wire Wire creep eliminated ANTI-KREEP WIRE LOCK free catalog has hundreds new items free micro bender offer JCM COMPANY 114 Washington Tert Waukegan IL 60085 Ii L:v Thone Aecnhat -ccscceosecane & inlid Ralsa Wiogs Wnng spat: 253/h aria 300 40 In. Engine 15 Co ends Twist drill elongate holes slit end shaft cut off wheel working hole partway edge File some notches axle ar eas down struts put tufts cot ton shafts just inboard holes Slide axle end hole has slit grasping firmly bend strut inserting other axle slit hole may find necessary bevel top axle aid insertion Mix up batch JB Weld warm up joint heat gun Using piece wire small nail coax JB Weld joint JB going argue rest assured itll go Put piece masking tape over end fit re maining axles using same procedure point youll need build fitting jig absolutely essential getting whole assembly straight Follow gen eral dimensions accompanying draw ing jig can made about 20 min utes table saw Lock spreader assemblies place jig fit solder N struts Since critical part job its important take time cer tain struts fit binding before wrapping soldering use coat hanger make master hangers bend easily course can afford waste couple getting shape just right youre completely satisfied use master pattern guide cutting bending N struts spreader assemblies still locked jig buff solder areas N strut ends wrap place No 24 copper wire Youll need about 20 copper wire joint Use sol dering gun torch intense heat torch would deposit carbon joint keep solder sticking After cleaning up soldered joints strut sembly ready mounting onto floats effective mounting method Please send 1 current ha catalog hating kite accessories Walt Moucha ModelsPO Box 1 12A 906-863-1225 e Menominee Ml 49858 WOSLOS 0100057 SCALE PHOTO OSSOtOS 000 0100 SACOS PLANS 3 vIEWS PLANS ENLAHONG SASE 5n1relfle 500*0 Jim Popinos Catalog 400 60 paqeSCALE PlANS ad PHOTO SEHOICE 3209 Mdtson GeenobOO NC 27403 phone ss2925239 NO collect Bob FiorenzeI Hobby Center Inc Dealer Yellow Aircraft Complete Line Mail Order Hobby Suppliea Now eveilable Feetoover Covering Materiel Visit Showroom 135 mm Disney WorIdi OmegalCool Power Fuels Discounted____ 420 Weet SR 434-407 3274353 winter Springe FL 32705 Fax 407 327-7143 place floats board lock down position strut assembly floats Attach latter small strapsor have exposed hardbacks through prepared holes Securing entire assembly airplane simply matter screwing appropriate size landing gear straps over down struts fu selage always mount strut first back out screws fill holes cyano acrylate CyA glue resecure screws Water rudders Whether airplane steers nose wheel taildragger making water rudders easy part former case replace nose wheel stub shaft extends 1/2 below fuselage install another steering arm Run length throttle cable steering arm along nose down N strut along length float tail-dragger hook length throttle cable rudder horn attach fuselage small aluminum clips tape Bend sleeve down past rear down strut along float securing two landing gear straps An extension below air rudder makes simplest water ruddersomewhat tackylooking effective 40-size model will require 3A2-dia wire reinforced lower air rudder hinge have subrudder make double duty running shaft extension through lower bearing reduce drag loads lower hinge air rudder kickup feature shown accompa nying drawing worth effort takes make allows rudder trail water kick up obstructions ground handling Goldberg Cub float kit incorporates feature Perhaps sufficient pressure readers Gold berg company might agree package sep arately modelers using different size floats Williams Brothers makes very small kickup unit must reworked operate freely requires steering arm extension make water rudder need A-in Du-Bro Goldberg nose wheel steer ing block stub shaft collar another arm little brass stock John Sullivan sug gests following rudder sizes matched indicated airplane sizes will effective job steering model through water 125 sq-in rudder 20-size planes 225 sq 40 325 sq 60 4 sq 90 45 sq in for 12-size models Although fullscale airplanes equipped two water rudders wont see paired installa tions models However should de cide use two rudders order improve turning moment use sizes indicated above Last Hints Department waterproof ing apply finger fillet clear silicone along juncture fuselage stabi lizer little around hinges Dont use silicone around steel struts its youre using may well kiss nuts goodbye ZAP LOCI ultimate thread-locking compound \MDrks metal wood plastic combination surlces Available ri medium blue label high green label strength ZAP THE TOTAL ADHESIVE SYSTEM pacer d Calbrida iSA PRODUCTS FOR ThE DISCERNING MODELER Complete Line Exhaust Systems d Pipes Muffled Tuned P10cm Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems IinsupaSi Woi October 1989 193 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX AH Designs61 AMA Membership13 Ace Radio Control11 Aerospace Composite Prod22 Aerotrol46 Air Flair20 Airline Supply Co50 Airtronics2 174 AI-Tec & Su-Pr-Line182 Altech Marketing175 177 Coy 3 American Sailplane Des162 B&P Associates4 BLB178 Quay Barber Models165 Big Sky153 Blue Ridge Mach & Tools192 Bolar Heli Research45 Bridi Aircraft9 Bru Line Industries61 Byron Originals22 83 183 CH Electronics46 Campbell Tools Co190 Campbells Custom Kits146 Carroll Consulting157 Channel 1 Productions165 Chicago Model Hobby Show181 Cleveland Model Supply12 Composite Aircraft Eng49 Control Systems Labs51 Coverite191 Cox Hobbies148 Craftsman Models Inc180 Crenshaw Aero57 Culpepper Models Inc188 Cygnet Software20 D&R Aircraft Mfg55 DGA Designs169 Doylejet190 Du-Bro Products Inc21 Duracraft180 E&G Enterprises184 Elden-Ken Electronics180 FHS Supply Inc18-19 Farnsworth & Elroy158 Fiorenze Hobby Center192 Fitzpatrick53 Flights Fancy Aeromodel188 Flyline Models .16 Fourmost Products178 Fults Dual Struts148 Futaba Corp America98-99 G&A Products 190 G&P Sales49 GM Precision Products180 Gas Model Products182 Gator RC Products166 Carl Goldberg Models23 92 Golden Gate Hobbies163 Philip Good Engine Repair10 Gorham Model Products12 Great American Hobbies16 Great Planes84 Paul K Guillow Inc59 High Sky163 Harry Higley & Sons189 Hobby Barn150-151 Hobby Dynamics17 105 179 Hobby Horn10 Hobby Lobby International 70-173 Hobby Woods57 Bob Holman Plans182 Hotel Harrington53 Ikon Northwest Co16 Indy RC Sales Inc154-156 JCM Company193 JR Radios105 179 JTec59 Larry Jolly Model Products51 Jomar20 K&B Mfg146 K&S Engineering153 Kalt17 Kingsway Enterprises167 Kraft Midwest162 Kustom Kraftsmanship164 Lone Star Models149 MACS Products193 MGA Enterprises57 Maral Technologies33 McDaniel RC Service55 Memphis Bell Classic190 Jim Messers176 Micro Mark6-7 Midwest Products. 1 Model Products Corp166 Model Rectifier CorpCoy 2 Walt Moucha Models193 Mutchlers Hobbies160-161 Nor-Ray Products Inc55 Northeast Aerodynamics4 Northeast Screen Graphics49 Pacer Tech97 176 188 193 Parrish Aircraft178 Pattern Tek168 John Peck Leisure Prod45 Peck-Polymers59 Penn Valley Hobby Center190 Perkins Avionics 148 Pica Products Plane Video 16 Planes & Things 168 Plasti-Kote Polks Hobby 90-91 Progress Mfg Co 44 QSAA 159 RAM59 RC Buyers Guide189 RC Designs 184 RC Extras191 RC Soaring Digest164 RJL Industries22 Radio South47 Ragan/Barker Group152 Red Max Fuel18-19 Robart37 Robbe Model Sport8 Rons Model Building12 Roun Tuit61 SAC 8 SR Batteries Safety Plus 4 22 Satellite City15 Scale Glider Components158 Scale Model Research192 Scale Plans & Photo Ser193 Sceptor Models32 Sermos RC Snap Connectors10 Shamrock Competition Imports47 Sheldons Hobby Shop20 Sig Mfg Co59 106-107 195 Bob Smith Industries46 163 Stangel Enterprises192 Star Kraft170 Superior Aircraft50 Sure Flite49 Suretech61 T&D Fiberglass Spec157 Tatone Products Co57 Tidewater Hobby Enterprises53 Todays Hobbies Inc45 Top Flite Models Inc108 Tower Hobbies185-187 Tru-Turn146 VL Products 12 WE Technical Services195 WW Models169 Wandit Mfg153 Williams Brothers167 Windsor Propeller Co37 World EnginesCover 4 Zenith Aviation5 very corrosive Skid fins battens flat-bottomed floats extending steps forward couple inches will give water rudder better leverage turning Spray rails deflect water inside bottom float away prop plastic tape find discount stores Radio Shack works very well Put strip along inboard fronts trim ex tend below chines Although four-stroke engines quite well prefer two-strokes because give better power-to-weight ratio Since long low-pitch props available wood theyre kind use Though chip two average season Ive found can trim off tip rebalance prop little loss fact discovered best prop 61 long-stroke acci dent cut /2 off 14 x 5 RevUp prop following prop/two-stroke matchups work best 10 x 4 20size engines 11 x 5 cut down 10 x 5 25 engines 11 x 5 12 x 4 can find 35-to-40 engines 13 x 5 14 x 5 cut down 13 x 5 60-size 194 Model Aviation engines however use Master Airscrew 10 x 6 North Star because length constraints after following suggestions find plane still wont lift off less 100 ft first make certain youre using seaplane prop isnt problem try following 1 remove little downthrust present 2 Put small shims under front down struts raise nose slightly youll see fullsize installations quite often offset power loss added weight drag floats causes 3 Go engine size larger always good idea first start building Very light planes like Seniorita will fly beautifully K&B 20 Sportster relatively heavy planes like Aero Stars really require big ger engine Ill wager once youve brought floatplane taxied right up shore youll wonder took long Go Model Float Manufacturers Ace R/C 116W t9th St PO Box 511 Higginsville MO 64037 Balsa USA PO Box 164 Marinette WS 54143 Beckman Floats Hobby Lobby Interna tional 5615 Franklin Pike Circle Brentwood TN 37027 Bill Westphal Floats Float Place 6301 234th Place SW Mountain Lake Ter race WA 98043 Carl Goldberg Models Inc 4734 West Chicago Ave Chicago IL 60651 Gee Bee Products PO Box 18 E Longmeadow MA 01028 Great Planes Model Mfr Co PO Box 721 Urbana IL 61801 John Sullivan Model Floatplane Products 1421 Second Street Callistoga CA 94515 Lens RC Enterprises Box 214 Mon trose BC Canada VOG lPO Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 sI KHAMPION 2-STROV IEK PINTQUART GALLON 0% Nitromethane $1075 5% Nitromethane $365$525$1275 10% Nitromethane $415$550$1475 15% Nitromethane $430$635$1675 25% Nitromethane $515$795$2195 35% Nitromethane $595$925$2695 10% Nitromethane$1425 15% Nitromethane$1625 -*/rn over 20 years SIG has blending finest quality model engine fuel available using st quality ingredients instance anol use 995% pure very best grade W money can buy also use real 100% pure t Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tam 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourself Prices subject change notice See aealer first available order direct Call _____ 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO IA 50171 Etfinger * says OnlyPlane Petterove Sets give assorted designs yoc WOt have selectod best classic dodges time noose choose fsm patfens tsr pan ae importans coclusive feature Golden Age Y Scale curtisa Hawk~ ength wingspan 2266 sq iv wing area 323 engines -4 channel RIC RCOS-14 8 /e Scale cuntiss Falcon I- \IA-A-J 83 length wing spae WI- 3t66sqinwingaea4ch RIG/ Y RCQS-t3 5 116 Scale cessna ing span sq wing area 26 66 engiens 43-4 channel RIG RC6S-t 8 113 Scale Piper cub J-3 11-9 wing span ength 2856 sq wing area 26 30 cid engines annel RIG RC3S-2 8 Quarter Scale WW SE-SA go wing span sq wing area 78 22 engines gCOS7 5 SPAD c-xlll 78 Ye spas 6 5s wing nine 13 1031 engines Capable flynt-it captores iwaginanion RCO6-8 5 FOKKER DR-i TRIPLANE 72 wing span sq wing area 78 166 engines RCOS-8 82495 SOPWITH CAMEL F1 84 wingspan 2t66 sq wisgareaett lhswloRIC Py wood ft balsa conettoction use 6$ sq 601 drawings RCOStt 5 N eWPiper Tn-Pacer PA-22 t 16-318 wing span sq wing area 20 30 cid esgines 4-h channel RIG nc t2 lbs 81116 scetall length Plswoodlbalsu fulselage removeable wing poonlo steerable nose wheel designed fo easy ground handling autbeotic scale tlight portormanve $C3S36299$ aill Effinger Feaediee Meerbar AMA NFFS Halt e$ Fame Prices $or camplele plans sub assembly aed detailed parts lists Add 8250 fee Mailing Tube Send ter brechure ahead 01 thu vrowd new boohun showing new Plan Sets 101986 Send St refundable 1st orderl WE TECHNICAL SERVICES PO Box 76884-A Atlanta GA 30328 October 1989 195
Edition: Model Aviation - 1989/10
Page Numbers: 93, 94, 95, 96, 191, 192, 193, 194, 195
IN MY PREVIOUS articles off-water flying concentrated identifying ba sic requirements activity discussed flying sites retrieval systems design parameters peculiar water concluding suggestions several models con vert nicely seaplanes present article follows up dis cussion float design strut assembly hardware design installation ex plains several modifications necessary setting up seaplane Although air plane capable taking off landing water generically defined seaplane emphasis will floatplane conver sions brief nod flying boats broad terms lets identify what good seaplane ought addition being waterproof aircraft should stable dur ing normal landings takeoffs moderate wind conditions should plane little no up elevator able turn across wind burying float Flying boats often suffer re spect because tip floats both too small too high arangement al lows strong crosswinds pick up wing bury opposite float During takeoff landing runouts good seaplane design should exhibit no ten dency porpoise symptom large cut away angles and/or short heels Finally well-designed seaplane floats will properly aligned airstream minimizes frontal area impact cruising speed Floats Full-scale airplanes equipped require floats will support about twice gross weight float lengths average about 83% fuselage length positioned approximately 44% centerline centerline lengths apart steps vary 47% 53% float lengths Fuselage float lengths usually about equal singlefloat craft dimensions stack up model world Pretty well actually Model airplanes seem quite well float length 75% fuselage buoy ancy factor 80% 100% greater total model weight fliS close-up snows inree %e x s-in spruce skid fins installed step improve on-step turning flat-bottomed floats Perhaps tacky some eyes simple ex tension air rudder still makes very ef fective water rudder lower hinge air rudder must however reinforced der compensate added drag loads arrive proper float length given model youll need some draw ing plans airplane Drop line vertically down 40% mean aerody namic chord MAC point another point lying one-third prop diameter ahead prop Twice distance tween two lines becomes float length should come out fairly close 75% fuselage length Youll notice step will positioned little rear center-of-gravity some reason have compro mise move step forward centerof-gravity rather moving tips back now have enough data obtain floats will fit model havent flown off-water before yourself favor purchase first floats Once youve gained some experience have better feel sizing may want design own names addresses float man ufacturers see listings end article Sending card should get brochure evaluating literature main factors consider length corres ponding weight range engine sizes youre lucky cost finishing floats key successful seaplaning obtain ing floats right length Since floats designed considerable buoy ancy reserve theyre long enough theyll support airplane host other fac tors however such time ability cost appearance may influence choice floats youre short time Gee Bee Beck man Westphal have ready-made floats sure check weight within prescribed limits molded floats tend heavier built-up ones cov ered foam As ability can build model floats piece cakeprovided dont get carried away covering process Floats need heavy Whats heavy 31-in 44-plywood-covered foam floats including attach fittings cover ing paint weigh 15 oz carry Se-TEIN& ARM /- A-~x rxr WAT PDR U Fo AA WAThR PA/ETI 0rA 5OLP6~ T0 TO VIEW left good close-up shot kickup rudder Sea Seniorita right drawing describing parts con struction details kickup feature quite worthwile protecting rudder against submerged obstructions especially ground handling size water rudder could have little larger however will turn airplane adequately light wind conditions 94 Model Aviation Left Close-up simple effective spray rail important keeping spray away prop Its nothing piece plastic tape found Radio Shack discount store Its installed inboard front floats extend about 1/8 below chines Right Throt tle cable used controlling water rudder seen wired N strut Note float vent made Nyrod protruding hardback typicai water rudder installation tfle back ot tne TlOt singie rudder usuaiiy quite aa equate models Suggested rudder sizes various model sizes listed text 1 1 1OAT 5rkJT5I 4I4c Ji& Left Detail drawing fitting jig used assemble float struts jig important enables strut assembly built true straight Right assembled float struts mounted jig successful strut system must lightweight flexible yet strong niorita all-up weight 74 oz 40-in floats same configuration weigh 2 lb ready go carry 95-lb Super Kadet However have another set 40-in floats Kadet builtup yet still weigh 2 lb Covered foam has twin advantages easier construction being less prone leaks still weighing same built-ups What cost Balsa USA sells 30in set around $12 set source weighs 7 oz apiece com plete doped silkspan Formula U Since Theyre built-up floats must sealed carefully foam core kits will cost twice Balsa USA price build ing time cut half Finally plastic molded floats heaviest ex pensive completely ready go box water 29-in Beckmans weigh 30 oz cost $77 plus shipping Gee Bee offers much less expensive alter native about $30 33-in set Gee Bee floats dont look much like fullscale counterparts work well shouldnt discounted Speaking appearance some folks care assembled float struts Sea Senior ita shown still mounted fitting jig shadows photograph can cause little confusion wire diameters used particular size airplane struts % N struts October 1989 95 4INGJ 6 ht & Up screams low flyby model will plane almost instantly application power Its equipped 31-in floats meet 750/o-of-the fuselage-length-rule Close-up full-scale Capri 2550 floats mounted Cessna 172 showing spray deflec tor keeps water away propeller during takeoff Also note sway cables under fuselage walk-across engine off course cables stretched across float tips about others dont modelers demand scale-looking floats oth ers simply want get off water Most us lie somewhere middle sug gestion go set floats closely matches airplane question realism youll find some full-scale floats bit clunky own right Note example flat tops slab sides Capri floats Cessna 172 shown photos Yes floats V-bottomed surfaces too flat rather curved manner Edo Pee Kay have Citabria floats resem bling Edos would really dress up Like full-scale brothers model floats either slab-sided variety D______ -iEC PiZ4LLl have single-curvature tops bottom sur faces however usually flat ease construction quick planing well minimize ground handling abrasion Theres no question however V bottomed floats have good scale appearance track well takeoff addition land ings accompanied slap flat surfaces produce choice yours Covering instructions cluded floats float kit dont pro vide much information covering fol lowing supplementary material might useful Appropriate covering materials run gamut plywood glass-and-resin balsa sheet MonoKote doped silkspan Formula U Ive tried have found plas tic film lightest film does tend loosen up however step area must carefully sealed Also bot tom sheet should applied last can lapped up sides prevent water seeping under edge Doped silkspan final painting Formula U works quite well achieving al much lightness plastic film Attractive trim designs easily applied over silkspan Glass-and-resin probably dur able method has beautiful finish painted glassing try spreading thin layer epoxy surface rolling float onto glass Smooth out apply second coat epoxy dry trick start sanding before epoxy has totally hardened allowing excess roll off surface clogging paper everything finished little trim stripe can really dress up ugly float Continued page 191 FL5FLl&PORPIAM FLOAT LN&tI-i LFL simplified drawing can help determining size position angles dimensions particular installation Refer text details working out own calculations H 5TL/T HEIGHT k Fl-I F- FLOAT L-eNGTh$ 96 Model Aviation ne autnors aaughter Lee Ann noaing inc 35-lb Step-Up model equipped 30-in built-up floats covered Mono Kote floats including fittings weigh 11 oz Getting up step requires some up elevator particular airplane dual water rudder actuating system modified Super Kadet almost hidden Slimline Pius-style muffler Two water rudders necessary particular installation Completed struts mounted set Balsa USA 30-in floats glassed ready painting AMA District VI VP Burgin KY trusty Associate VP Ron Ballard Decatur IN both hand greet modelers AMA booth Jim presented South Bend RC Club AMA Award Service recognition its con tinued efforts staging Pot-O-Gold show recognition extraordinary nature its accomplishments plaque states Pot-O-Gold So much lit tle time Club President Ron Vander Molen accepted plaque behalf SBRC Club separate awards ceremony Jim Sears presented 25-Year Service Award plaque Tn-Valley RC Club Club president Bob Kyle accepted award TnValley South Bend RC groups sister clubs representing best interests mod elers both north south sides South Bend St Joseph County memberships span border area between AMA districts VI VII Throughout two-day show SBRC maintained solid frequency control coor dinated demonstration activity mishap occurred event coordinator constant contact scannerequipped control center D&J Electronics Howell MI also assisted frequency control during busy periods SBRC Club delighted receive participation four corners USA broad array dealers man ufacturers hobby-related businesses 75 alloccupying 118 booths state Washington California New York Florida represented Hazel Sig Hester promised display full-size Space Walker next year Midwest well known density its modeling popu lation considerable percentage resides within 150-mile radius South Bend demographics like SBRC Club poised greater growth its future Pot-O-Gold shows Floats-Fitti ngs/Westwood Continued page 96 Correct positioning floats model important Positioning must worked out before mounting fittings considered youll need re turn plans adding sketch made determine float length Starting airplanes prop its cor rect position take 15% prop diameter measure distance below bottom prop Draw line parallel longitudinal axis fuselage marks position top floats Seniorita using 10 x 4 10 x 5 prop top floats will 1 bottom prop An Eagle 63 turning 11 x 5 prop will require dis tance 1% Position step 40% MACor 40% chord wing rectangu lar everything done correctly youll have fairly conventional installation no surprises tips floats should about half little less prop di ameter forward prop Obviously farther forward bows better planing characteristics crucial point have enough float forward prop stopping short excessive amount Both Seniorita Light & Up have 31-in floats meet 75% rule application power no elevator control floats get plane almost im mediately task remains draw position hardbacks Most built-up floats will have internal hardbacks have type youre home free since can install spreaders anywhere please Exposed hardbacks used floats such Gee Bee require careful planning Though still allow consid erable adjustment youll need determine location exposed hardbacks beforehand draw Fittings can now considered almost designs fittings Newest Ailane Full Size Aerobatic World. .Now Available Three Size Model Kits EXTRA 230 Gtandoff Scala 33% 96 Span Wing Awe 1300 St 30% 87 Span Wing Am 117 sq 25% 75 Span Wing Aa 558 sq 229 1 $15 ship 219 I-i $l5shipl 179 hip October 1989 191 magnificently crafted tool reduces temperature drift 50 ciZ7~ THE BLACK BARON IRON Advanced hi-tech thermostat reduces temperature drift 50 Ordinary irons vary up 400 Exclusive roil bars fit fillets & under cambers Flat sole bevelled edges provides constant heat marks Coating 100% Blackstone big improvement over lessBoNus! expensive coatings slides almost noTwo stands adhesive ui1u ruy magnificent tooincluding j,j TI1ethat attaches iron Iont have CGVERE look 420 Babylon Rd Horsham PA 19044 100% Blackstone coating slides like butter Exclusive roll-bars roll fillets & undercambers responding advertisers mention read about ModelAviation G Duane Coles T- 199 1 SlOshipping R/C EXTRAS 1404 Vandenburg Cir W Sergeant Bluff IA 51054 Phone 1 712 943 4102 Cash Money Orden Ceditied Chenh VISA o \IZI1MasCad oceptdNo COD Odes lJ *PwyonM Cheohn two weeks HANGAR-7 R/C & C/L MODELS Proffesional Neans quality Results Cozoenpietre Lzit PreCut AAA Balsa & Ply PrePorned Landing Gear Spruce & Maple Bond PoIISone Rolled Plans Instructions Wheels Controls Etc Rot Included P1crcs PJnas Kitr ahove escept UCUT parts 00th handy teoplate cheet provided C P1nnas Otoly Foilsize rolled plans template sheet instractoons shlpped first class nail Free Catalog $59 $35 C $11 RIO cORSAIR 25 Distinctive lieU Wins Pavorite SemiScale Wong Span ii Wing Area iSO Sq Length 341/2 Loading II Sz/Sq Pt Weight 31/20 Engine 25 Co In. Radio iChannel Std B $25 C $7 B/C iJORtIET 074 Spurt Bipi. ~ldnl Wing Span 27 Bong Area 27i Sq In. Length 25 Loading 13 Sn Sq Pt. Weight 11/20 Engine 074 Coo Qaeen Bee Radio iChannel Micro Servos $49 B $30 C $9 B/C ALLcICAIi Ii AileronOF Spurt PlyrcI Wing Span Wing Area 375 sq on. LesEth 351/2 Weight 20 $25 C $9 Profile Fuselage & InsltUp Sheeted Wing Wing Span 58I/i Area 540 Sq In. Engi:e iS $39 $25 C $9 C/LI CESSNA AEROBAT 35 Enique lepreunive Sight Profile Faselage & Boiltip Sheeted Wing wing Span 52 Area iii Sq togise 35 Stunt C/LI hEIR 2 ecU Plyer/Tcaieect ciScUp Sheeted Wiogs selage Wing Span$ 1 3 II Area 200 Sq Engine 15 Cu In ntroductory prices above good until Oct 1 1989 ORDER YOURS TODAY Pleane add $4 shipping & handling 3 Send chech money order VISA & MC accepted Gice sreet addrons kiln nod phone credit cardt GEL ENTERPRISES P Q BOX 336 PB 414 5454172 WAUKESHA WISCONSIN 53187-0336 MEMBEREAA AC models real key simplic ity Simple fittings properly made will give maximum lightness strength have attractive appear ance major differences between fullscale model fittings model float fit tings down struts N drag struts spreaders normally designed flexible enough withstand bending loads whereas full-scale fittings spread ers made withstand bending manned water flight wheeled dolly picks up entire aircraft using two pad ded rails slipped under spreaders just board floats hollow extruded alu minum spreaders filled wood ex panded foam simply keep col lapsing during ground handling fullscale down struts N struts pinjointed can carry tension com pression loads Side loads carried cable cross bracing Another cable stretched across front bollards serves footbridge afloat engine off course Since full-scale installation rigid need V bottomed configuration floats comes obvious float-equipped models down struts one-piece designed carry side loads N struts carry drag loads just full-scale applications spreaders holding floats parallel resisting separation loads Youll probably struck apparent flimsiness frame attaches floats model never cease amazed much system flexes both during ground handling water thats what makes work rigid youd breaking something time made not-so-gentle landings wed rather talk about As stuff get away envy full-scale operator Using back plans sketch fuselage cross section wing lead ing edge Draw float tops below fuselage centerlines floats should positioned half length apart Determine location hardbacks floats equipped sketch Draw down strut have ready-made floats attachfitting stock begin taking measure ments point fittings provided can t bent fit drawing make new ones Dont pressured working wrong size fittings just because came kit high-wing planes rear strut usually same dimension front positioned about three-fourths wing chord back Sig Cub excep tion its rear strut slightly longer fuselage bottom isnt horizontal between front rear down struts youll have draw another fuselage cross section rear strut attaches fashion slightly different rear strut Now comes fun part bending wire making struts use 5A2-dia wire planes under 3 lb %-dia air192 Model Aviation planes up 6 lb %2-dia wire ships up 10 lb quarter-scale machine like Cub will require Y18-dia wire must heated sufficient pliability Heat ing wire takes temper out bend doesnt seem create prob lems 40-size plane requires A-dia wire single 36-in-long piece will enough both struts After cutting wire Dremel cut off wheel marking masking tape move big vise hammer Using cardboard template made draw ings start banging pulling wire about six inches bend check bend against pattern usually overbending slightly pull back eliminate residual stresses Continuing other bends similar fashion end up two custom-made down struts make N struts wire size smaller used down struts larger size isnt necessary drag loads spreaders made out same-diameter wire down struts can wrapped No 24 copper wire soldered directly across bot toms prefer put bends end just inboard flats way rear N strut can wrapped si multaneously rear spreader Another type spreader prefer arrow shaft available several diameters 32 long use 4-in-dia shafts small planes /lh-dia shafts 40 through 60-size ma chines Fiberglass shafts virtually inde structible after drilling holes fit ting struts Fabrication sequence Review accom panying drawings familiarize yourself assembly procedure using ar row shaft spreader cut shafts spreader width Airplanes 40-size range usually take 16-in spreaders both spreaders can made shaft Drill holes down strut axles MAJERIOG catalog .a -$100 wS-- ff43LU1 RIDGE nnaa Hurricane VVV 25528 MACIUNERY& TOOLS P0 Boa 536-Y Lj 304-562-3538 otter complete selBctiOn lathes mills tools Aviation Modeler THE WIREMASTER em benderbooder extra large handle bends 1/81/4 coils 5/ 32-3/16 music wire Wire creep eliminated ANTI-KREEP WIRE LOCK free catalog has hundreds new items free micro bender offer JCM COMPANY 114 Washington Tert Waukegan IL 60085 Ii L:v Thone Aecnhat -ccscceosecane & inlid Ralsa Wiogs Wnng spat: 253/h aria 300 40 In. Engine 15 Co ends Twist drill elongate holes slit end shaft cut off wheel working hole partway edge File some notches axle ar eas down struts put tufts cot ton shafts just inboard holes Slide axle end hole has slit grasping firmly bend strut inserting other axle slit hole may find necessary bevel top axle aid insertion Mix up batch JB Weld warm up joint heat gun Using piece wire small nail coax JB Weld joint JB going argue rest assured itll go Put piece masking tape over end fit re maining axles using same procedure point youll need build fitting jig absolutely essential getting whole assembly straight Follow gen eral dimensions accompanying draw ing jig can made about 20 min utes table saw Lock spreader assemblies place jig fit solder N struts Since critical part job its important take time cer tain struts fit binding before wrapping soldering use coat hanger make master hangers bend easily course can afford waste couple getting shape just right youre completely satisfied use master pattern guide cutting bending N struts spreader assemblies still locked jig buff solder areas N strut ends wrap place No 24 copper wire Youll need about 20 copper wire joint Use sol dering gun torch intense heat torch would deposit carbon joint keep solder sticking After cleaning up soldered joints strut sembly ready mounting onto floats effective mounting method Please send 1 current ha catalog hating kite accessories Walt Moucha ModelsPO Box 1 12A 906-863-1225 e Menominee Ml 49858 WOSLOS 0100057 SCALE PHOTO OSSOtOS 000 0100 SACOS PLANS 3 vIEWS PLANS ENLAHONG SASE 5n1relfle 500*0 Jim Popinos Catalog 400 60 paqeSCALE PlANS ad PHOTO SEHOICE 3209 Mdtson GeenobOO NC 27403 phone ss2925239 NO collect Bob FiorenzeI Hobby Center Inc Dealer Yellow Aircraft Complete Line Mail Order Hobby Suppliea Now eveilable Feetoover Covering Materiel Visit Showroom 135 mm Disney WorIdi OmegalCool Power Fuels Discounted____ 420 Weet SR 434-407 3274353 winter Springe FL 32705 Fax 407 327-7143 place floats board lock down position strut assembly floats Attach latter small strapsor have exposed hardbacks through prepared holes Securing entire assembly airplane simply matter screwing appropriate size landing gear straps over down struts fu selage always mount strut first back out screws fill holes cyano acrylate CyA glue resecure screws Water rudders Whether airplane steers nose wheel taildragger making water rudders easy part former case replace nose wheel stub shaft extends 1/2 below fuselage install another steering arm Run length throttle cable steering arm along nose down N strut along length float tail-dragger hook length throttle cable rudder horn attach fuselage small aluminum clips tape Bend sleeve down past rear down strut along float securing two landing gear straps An extension below air rudder makes simplest water ruddersomewhat tackylooking effective 40-size model will require 3A2-dia wire reinforced lower air rudder hinge have subrudder make double duty running shaft extension through lower bearing reduce drag loads lower hinge air rudder kickup feature shown accompa nying drawing worth effort takes make allows rudder trail water kick up obstructions ground handling Goldberg Cub float kit incorporates feature Perhaps sufficient pressure readers Gold berg company might agree package sep arately modelers using different size floats Williams Brothers makes very small kickup unit must reworked operate freely requires steering arm extension make water rudder need A-in Du-Bro Goldberg nose wheel steer ing block stub shaft collar another arm little brass stock John Sullivan sug gests following rudder sizes matched indicated airplane sizes will effective job steering model through water 125 sq-in rudder 20-size planes 225 sq 40 325 sq 60 4 sq 90 45 sq in for 12-size models Although fullscale airplanes equipped two water rudders wont see paired installa tions models However should de cide use two rudders order improve turning moment use sizes indicated above Last Hints Department waterproof ing apply finger fillet clear silicone along juncture fuselage stabi lizer little around hinges Dont use silicone around steel struts its youre using may well kiss nuts goodbye ZAP LOCI ultimate thread-locking compound \MDrks metal wood plastic combination surlces Available ri medium blue label high green label strength ZAP THE TOTAL ADHESIVE SYSTEM pacer d Calbrida iSA PRODUCTS FOR ThE DISCERNING MODELER Complete Line Exhaust Systems d Pipes Muffled Tuned P10cm Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems IinsupaSi Woi October 1989 193 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX AH Designs61 AMA Membership13 Ace Radio Control11 Aerospace Composite Prod22 Aerotrol46 Air Flair20 Airline Supply Co50 Airtronics2 174 AI-Tec & Su-Pr-Line182 Altech Marketing175 177 Coy 3 American Sailplane Des162 B&P Associates4 BLB178 Quay Barber Models165 Big Sky153 Blue Ridge Mach & Tools192 Bolar Heli Research45 Bridi Aircraft9 Bru Line Industries61 Byron Originals22 83 183 CH Electronics46 Campbell Tools Co190 Campbells Custom Kits146 Carroll Consulting157 Channel 1 Productions165 Chicago Model Hobby Show181 Cleveland Model Supply12 Composite Aircraft Eng49 Control Systems Labs51 Coverite191 Cox Hobbies148 Craftsman Models Inc180 Crenshaw Aero57 Culpepper Models Inc188 Cygnet Software20 D&R Aircraft Mfg55 DGA Designs169 Doylejet190 Du-Bro Products Inc21 Duracraft180 E&G Enterprises184 Elden-Ken Electronics180 FHS Supply Inc18-19 Farnsworth & Elroy158 Fiorenze Hobby Center192 Fitzpatrick53 Flights Fancy Aeromodel188 Flyline Models .16 Fourmost Products178 Fults Dual Struts148 Futaba Corp America98-99 G&A Products 190 G&P Sales49 GM Precision Products180 Gas Model Products182 Gator RC Products166 Carl Goldberg Models23 92 Golden Gate Hobbies163 Philip Good Engine Repair10 Gorham Model Products12 Great American Hobbies16 Great Planes84 Paul K Guillow Inc59 High Sky163 Harry Higley & Sons189 Hobby Barn150-151 Hobby Dynamics17 105 179 Hobby Horn10 Hobby Lobby International 70-173 Hobby Woods57 Bob Holman Plans182 Hotel Harrington53 Ikon Northwest Co16 Indy RC Sales Inc154-156 JCM Company193 JR Radios105 179 JTec59 Larry Jolly Model Products51 Jomar20 K&B Mfg146 K&S Engineering153 Kalt17 Kingsway Enterprises167 Kraft Midwest162 Kustom Kraftsmanship164 Lone Star Models149 MACS Products193 MGA Enterprises57 Maral Technologies33 McDaniel RC Service55 Memphis Bell Classic190 Jim Messers176 Micro Mark6-7 Midwest Products. 1 Model Products Corp166 Model Rectifier CorpCoy 2 Walt Moucha Models193 Mutchlers Hobbies160-161 Nor-Ray Products Inc55 Northeast Aerodynamics4 Northeast Screen Graphics49 Pacer Tech97 176 188 193 Parrish Aircraft178 Pattern Tek168 John Peck Leisure Prod45 Peck-Polymers59 Penn Valley Hobby Center190 Perkins Avionics 148 Pica Products Plane Video 16 Planes & Things 168 Plasti-Kote Polks Hobby 90-91 Progress Mfg Co 44 QSAA 159 RAM59 RC Buyers Guide189 RC Designs 184 RC Extras191 RC Soaring Digest164 RJL Industries22 Radio South47 Ragan/Barker Group152 Red Max Fuel18-19 Robart37 Robbe Model Sport8 Rons Model Building12 Roun Tuit61 SAC 8 SR Batteries Safety Plus 4 22 Satellite City15 Scale Glider Components158 Scale Model Research192 Scale Plans & Photo Ser193 Sceptor Models32 Sermos RC Snap Connectors10 Shamrock Competition Imports47 Sheldons Hobby Shop20 Sig Mfg Co59 106-107 195 Bob Smith Industries46 163 Stangel Enterprises192 Star Kraft170 Superior Aircraft50 Sure Flite49 Suretech61 T&D Fiberglass Spec157 Tatone Products Co57 Tidewater Hobby Enterprises53 Todays Hobbies Inc45 Top Flite Models Inc108 Tower Hobbies185-187 Tru-Turn146 VL Products 12 WE Technical Services195 WW Models169 Wandit Mfg153 Williams Brothers167 Windsor Propeller Co37 World EnginesCover 4 Zenith Aviation5 very corrosive Skid fins battens flat-bottomed floats extending steps forward couple inches will give water rudder better leverage turning Spray rails deflect water inside bottom float away prop plastic tape find discount stores Radio Shack works very well Put strip along inboard fronts trim ex tend below chines Although four-stroke engines quite well prefer two-strokes because give better power-to-weight ratio Since long low-pitch props available wood theyre kind use Though chip two average season Ive found can trim off tip rebalance prop little loss fact discovered best prop 61 long-stroke acci dent cut /2 off 14 x 5 RevUp prop following prop/two-stroke matchups work best 10 x 4 20size engines 11 x 5 cut down 10 x 5 25 engines 11 x 5 12 x 4 can find 35-to-40 engines 13 x 5 14 x 5 cut down 13 x 5 60-size 194 Model Aviation engines however use Master Airscrew 10 x 6 North Star because length constraints after following suggestions find plane still wont lift off less 100 ft first make certain youre using seaplane prop isnt problem try following 1 remove little downthrust present 2 Put small shims under front down struts raise nose slightly youll see fullsize installations quite often offset power loss added weight drag floats causes 3 Go engine size larger always good idea first start building Very light planes like Seniorita will fly beautifully K&B 20 Sportster relatively heavy planes like Aero Stars really require big ger engine Ill wager once youve brought floatplane taxied right up shore youll wonder took long Go Model Float Manufacturers Ace R/C 116W t9th St PO Box 511 Higginsville MO 64037 Balsa USA PO Box 164 Marinette WS 54143 Beckman Floats Hobby Lobby Interna tional 5615 Franklin Pike Circle Brentwood TN 37027 Bill Westphal Floats Float Place 6301 234th Place SW Mountain Lake Ter race WA 98043 Carl Goldberg Models Inc 4734 West Chicago Ave Chicago IL 60651 Gee Bee Products PO Box 18 E Longmeadow MA 01028 Great Planes Model Mfr Co PO Box 721 Urbana IL 61801 John Sullivan Model Floatplane Products 1421 Second Street Callistoga CA 94515 Lens RC Enterprises Box 214 Mon trose BC Canada VOG lPO Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 sI KHAMPION 2-STROV IEK PINTQUART GALLON 0% Nitromethane $1075 5% Nitromethane $365$525$1275 10% Nitromethane $415$550$1475 15% Nitromethane $430$635$1675 25% Nitromethane $515$795$2195 35% Nitromethane $595$925$2695 10% Nitromethane$1425 15% Nitromethane$1625 -*/rn over 20 years SIG has blending finest quality model engine fuel available using st quality ingredients instance anol use 995% pure very best grade W money can buy also use real 100% pure t Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tam 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourself Prices subject change notice See aealer first available order direct Call _____ 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO IA 50171 Etfinger * says OnlyPlane Petterove Sets give assorted designs yoc WOt have selectod best classic dodges time noose choose fsm patfens tsr pan ae importans coclusive feature Golden Age Y Scale curtisa Hawk~ ength wingspan 2266 sq iv wing area 323 engines -4 channel RIC RCOS-14 8 /e Scale cuntiss Falcon I- \IA-A-J 83 length wing spae WI- 3t66sqinwingaea4ch RIG/ Y RCQS-t3 5 116 Scale cessna ing span sq wing area 26 66 engiens 43-4 channel RIG RC6S-t 8 113 Scale Piper cub J-3 11-9 wing span ength 2856 sq wing area 26 30 cid engines annel RIG RC3S-2 8 Quarter Scale WW SE-SA go wing span sq wing area 78 22 engines gCOS7 5 SPAD c-xlll 78 Ye spas 6 5s wing nine 13 1031 engines Capable flynt-it captores iwaginanion RCO6-8 5 FOKKER DR-i TRIPLANE 72 wing span sq wing area 78 166 engines RCOS-8 82495 SOPWITH CAMEL F1 84 wingspan 2t66 sq wisgareaett lhswloRIC Py wood ft balsa conettoction use 6$ sq 601 drawings RCOStt 5 N eWPiper Tn-Pacer PA-22 t 16-318 wing span sq wing area 20 30 cid esgines 4-h channel RIG nc t2 lbs 81116 scetall length Plswoodlbalsu fulselage removeable wing poonlo steerable nose wheel designed fo easy ground handling autbeotic scale tlight portormanve $C3S36299$ aill Effinger Feaediee Meerbar AMA NFFS Halt e$ Fame Prices $or camplele plans sub assembly aed detailed parts lists Add 8250 fee Mailing Tube Send ter brechure ahead 01 thu vrowd new boohun showing new Plan Sets 101986 Send St refundable 1st orderl WE TECHNICAL SERVICES PO Box 76884-A Atlanta GA 30328 October 1989 195
Edition: Model Aviation - 1989/10
Page Numbers: 93, 94, 95, 96, 191, 192, 193, 194, 195
IN MY PREVIOUS articles off-water flying concentrated identifying ba sic requirements activity discussed flying sites retrieval systems design parameters peculiar water concluding suggestions several models con vert nicely seaplanes present article follows up dis cussion float design strut assembly hardware design installation ex plains several modifications necessary setting up seaplane Although air plane capable taking off landing water generically defined seaplane emphasis will floatplane conver sions brief nod flying boats broad terms lets identify what good seaplane ought addition being waterproof aircraft should stable dur ing normal landings takeoffs moderate wind conditions should plane little no up elevator able turn across wind burying float Flying boats often suffer re spect because tip floats both too small too high arangement al lows strong crosswinds pick up wing bury opposite float During takeoff landing runouts good seaplane design should exhibit no ten dency porpoise symptom large cut away angles and/or short heels Finally well-designed seaplane floats will properly aligned airstream minimizes frontal area impact cruising speed Floats Full-scale airplanes equipped require floats will support about twice gross weight float lengths average about 83% fuselage length positioned approximately 44% centerline centerline lengths apart steps vary 47% 53% float lengths Fuselage float lengths usually about equal singlefloat craft dimensions stack up model world Pretty well actually Model airplanes seem quite well float length 75% fuselage buoy ancy factor 80% 100% greater total model weight fliS close-up snows inree %e x s-in spruce skid fins installed step improve on-step turning flat-bottomed floats Perhaps tacky some eyes simple ex tension air rudder still makes very ef fective water rudder lower hinge air rudder must however reinforced der compensate added drag loads arrive proper float length given model youll need some draw ing plans airplane Drop line vertically down 40% mean aerody namic chord MAC point another point lying one-third prop diameter ahead prop Twice distance tween two lines becomes float length should come out fairly close 75% fuselage length Youll notice step will positioned little rear center-of-gravity some reason have compro mise move step forward centerof-gravity rather moving tips back now have enough data obtain floats will fit model havent flown off-water before yourself favor purchase first floats Once youve gained some experience have better feel sizing may want design own names addresses float man ufacturers see listings end article Sending card should get brochure evaluating literature main factors consider length corres ponding weight range engine sizes youre lucky cost finishing floats key successful seaplaning obtain ing floats right length Since floats designed considerable buoy ancy reserve theyre long enough theyll support airplane host other fac tors however such time ability cost appearance may influence choice floats youre short time Gee Bee Beck man Westphal have ready-made floats sure check weight within prescribed limits molded floats tend heavier built-up ones cov ered foam As ability can build model floats piece cakeprovided dont get carried away covering process Floats need heavy Whats heavy 31-in 44-plywood-covered foam floats including attach fittings cover ing paint weigh 15 oz carry Se-TEIN& ARM /- A-~x rxr WAT PDR U Fo AA WAThR PA/ETI 0rA 5OLP6~ T0 TO VIEW left good close-up shot kickup rudder Sea Seniorita right drawing describing parts con struction details kickup feature quite worthwile protecting rudder against submerged obstructions especially ground handling size water rudder could have little larger however will turn airplane adequately light wind conditions 94 Model Aviation Left Close-up simple effective spray rail important keeping spray away prop Its nothing piece plastic tape found Radio Shack discount store Its installed inboard front floats extend about 1/8 below chines Right Throt tle cable used controlling water rudder seen wired N strut Note float vent made Nyrod protruding hardback typicai water rudder installation tfle back ot tne TlOt singie rudder usuaiiy quite aa equate models Suggested rudder sizes various model sizes listed text 1 1 1OAT 5rkJT5I 4I4c Ji& Left Detail drawing fitting jig used assemble float struts jig important enables strut assembly built true straight Right assembled float struts mounted jig successful strut system must lightweight flexible yet strong niorita all-up weight 74 oz 40-in floats same configuration weigh 2 lb ready go carry 95-lb Super Kadet However have another set 40-in floats Kadet builtup yet still weigh 2 lb Covered foam has twin advantages easier construction being less prone leaks still weighing same built-ups What cost Balsa USA sells 30in set around $12 set source weighs 7 oz apiece com plete doped silkspan Formula U Since Theyre built-up floats must sealed carefully foam core kits will cost twice Balsa USA price build ing time cut half Finally plastic molded floats heaviest ex pensive completely ready go box water 29-in Beckmans weigh 30 oz cost $77 plus shipping Gee Bee offers much less expensive alter native about $30 33-in set Gee Bee floats dont look much like fullscale counterparts work well shouldnt discounted Speaking appearance some folks care assembled float struts Sea Senior ita shown still mounted fitting jig shadows photograph can cause little confusion wire diameters used particular size airplane struts % N struts October 1989 95 4INGJ 6 ht & Up screams low flyby model will plane almost instantly application power Its equipped 31-in floats meet 750/o-of-the fuselage-length-rule Close-up full-scale Capri 2550 floats mounted Cessna 172 showing spray deflec tor keeps water away propeller during takeoff Also note sway cables under fuselage walk-across engine off course cables stretched across float tips about others dont modelers demand scale-looking floats oth ers simply want get off water Most us lie somewhere middle sug gestion go set floats closely matches airplane question realism youll find some full-scale floats bit clunky own right Note example flat tops slab sides Capri floats Cessna 172 shown photos Yes floats V-bottomed surfaces too flat rather curved manner Edo Pee Kay have Citabria floats resem bling Edos would really dress up Like full-scale brothers model floats either slab-sided variety D______ -iEC PiZ4LLl have single-curvature tops bottom sur faces however usually flat ease construction quick planing well minimize ground handling abrasion Theres no question however V bottomed floats have good scale appearance track well takeoff addition land ings accompanied slap flat surfaces produce choice yours Covering instructions cluded floats float kit dont pro vide much information covering fol lowing supplementary material might useful Appropriate covering materials run gamut plywood glass-and-resin balsa sheet MonoKote doped silkspan Formula U Ive tried have found plas tic film lightest film does tend loosen up however step area must carefully sealed Also bot tom sheet should applied last can lapped up sides prevent water seeping under edge Doped silkspan final painting Formula U works quite well achieving al much lightness plastic film Attractive trim designs easily applied over silkspan Glass-and-resin probably dur able method has beautiful finish painted glassing try spreading thin layer epoxy surface rolling float onto glass Smooth out apply second coat epoxy dry trick start sanding before epoxy has totally hardened allowing excess roll off surface clogging paper everything finished little trim stripe can really dress up ugly float Continued page 191 FL5FLl&PORPIAM FLOAT LN&tI-i LFL simplified drawing can help determining size position angles dimensions particular installation Refer text details working out own calculations H 5TL/T HEIGHT k Fl-I F- FLOAT L-eNGTh$ 96 Model Aviation ne autnors aaughter Lee Ann noaing inc 35-lb Step-Up model equipped 30-in built-up floats covered Mono Kote floats including fittings weigh 11 oz Getting up step requires some up elevator particular airplane dual water rudder actuating system modified Super Kadet almost hidden Slimline Pius-style muffler Two water rudders necessary particular installation Completed struts mounted set Balsa USA 30-in floats glassed ready painting AMA District VI VP Burgin KY trusty Associate VP Ron Ballard Decatur IN both hand greet modelers AMA booth Jim presented South Bend RC Club AMA Award Service recognition its con tinued efforts staging Pot-O-Gold show recognition extraordinary nature its accomplishments plaque states Pot-O-Gold So much lit tle time Club President Ron Vander Molen accepted plaque behalf SBRC Club separate awards ceremony Jim Sears presented 25-Year Service Award plaque Tn-Valley RC Club Club president Bob Kyle accepted award TnValley South Bend RC groups sister clubs representing best interests mod elers both north south sides South Bend St Joseph County memberships span border area between AMA districts VI VII Throughout two-day show SBRC maintained solid frequency control coor dinated demonstration activity mishap occurred event coordinator constant contact scannerequipped control center D&J Electronics Howell MI also assisted frequency control during busy periods SBRC Club delighted receive participation four corners USA broad array dealers man ufacturers hobby-related businesses 75 alloccupying 118 booths state Washington California New York Florida represented Hazel Sig Hester promised display full-size Space Walker next year Midwest well known density its modeling popu lation considerable percentage resides within 150-mile radius South Bend demographics like SBRC Club poised greater growth its future Pot-O-Gold shows Floats-Fitti ngs/Westwood Continued page 96 Correct positioning floats model important Positioning must worked out before mounting fittings considered youll need re turn plans adding sketch made determine float length Starting airplanes prop its cor rect position take 15% prop diameter measure distance below bottom prop Draw line parallel longitudinal axis fuselage marks position top floats Seniorita using 10 x 4 10 x 5 prop top floats will 1 bottom prop An Eagle 63 turning 11 x 5 prop will require dis tance 1% Position step 40% MACor 40% chord wing rectangu lar everything done correctly youll have fairly conventional installation no surprises tips floats should about half little less prop di ameter forward prop Obviously farther forward bows better planing characteristics crucial point have enough float forward prop stopping short excessive amount Both Seniorita Light & Up have 31-in floats meet 75% rule application power no elevator control floats get plane almost im mediately task remains draw position hardbacks Most built-up floats will have internal hardbacks have type youre home free since can install spreaders anywhere please Exposed hardbacks used floats such Gee Bee require careful planning Though still allow consid erable adjustment youll need determine location exposed hardbacks beforehand draw Fittings can now considered almost designs fittings Newest Ailane Full Size Aerobatic World. .Now Available Three Size Model Kits EXTRA 230 Gtandoff Scala 33% 96 Span Wing Awe 1300 St 30% 87 Span Wing Am 117 sq 25% 75 Span Wing Aa 558 sq 229 1 $15 ship 219 I-i $l5shipl 179 hip October 1989 191 magnificently crafted tool reduces temperature drift 50 ciZ7~ THE BLACK BARON IRON Advanced hi-tech thermostat reduces temperature drift 50 Ordinary irons vary up 400 Exclusive roil bars fit fillets & under cambers Flat sole bevelled edges provides constant heat marks Coating 100% Blackstone big improvement over lessBoNus! expensive coatings slides almost noTwo stands adhesive ui1u ruy magnificent tooincluding j,j TI1ethat attaches iron Iont have CGVERE look 420 Babylon Rd Horsham PA 19044 100% Blackstone coating slides like butter Exclusive roll-bars roll fillets & undercambers responding advertisers mention read about ModelAviation G Duane Coles T- 199 1 SlOshipping R/C EXTRAS 1404 Vandenburg Cir W Sergeant Bluff IA 51054 Phone 1 712 943 4102 Cash Money Orden Ceditied Chenh VISA o \IZI1MasCad oceptdNo COD Odes lJ *PwyonM Cheohn two weeks HANGAR-7 R/C & C/L MODELS Proffesional Neans quality Results Cozoenpietre Lzit PreCut AAA Balsa & Ply PrePorned Landing Gear Spruce & Maple Bond PoIISone Rolled Plans Instructions Wheels Controls Etc Rot Included P1crcs PJnas Kitr ahove escept UCUT parts 00th handy teoplate cheet provided C P1nnas Otoly Foilsize rolled plans template sheet instractoons shlpped first class nail Free Catalog $59 $35 C $11 RIO cORSAIR 25 Distinctive lieU Wins Pavorite SemiScale Wong Span ii Wing Area iSO Sq Length 341/2 Loading II Sz/Sq Pt Weight 31/20 Engine 25 Co In. Radio iChannel Std B $25 C $7 B/C iJORtIET 074 Spurt Bipi. ~ldnl Wing Span 27 Bong Area 27i Sq In. Length 25 Loading 13 Sn Sq Pt. Weight 11/20 Engine 074 Coo Qaeen Bee Radio iChannel Micro Servos $49 B $30 C $9 B/C ALLcICAIi Ii AileronOF Spurt PlyrcI Wing Span Wing Area 375 sq on. LesEth 351/2 Weight 20 $25 C $9 Profile Fuselage & InsltUp Sheeted Wing Wing Span 58I/i Area 540 Sq In. Engi:e iS $39 $25 C $9 C/LI CESSNA AEROBAT 35 Enique lepreunive Sight Profile Faselage & Boiltip Sheeted Wing wing Span 52 Area iii Sq togise 35 Stunt C/LI hEIR 2 ecU Plyer/Tcaieect ciScUp Sheeted Wiogs selage Wing Span$ 1 3 II Area 200 Sq Engine 15 Cu In ntroductory prices above good until Oct 1 1989 ORDER YOURS TODAY Pleane add $4 shipping & handling 3 Send chech money order VISA & MC accepted Gice sreet addrons kiln nod phone credit cardt GEL ENTERPRISES P Q BOX 336 PB 414 5454172 WAUKESHA WISCONSIN 53187-0336 MEMBEREAA AC models real key simplic ity Simple fittings properly made will give maximum lightness strength have attractive appear ance major differences between fullscale model fittings model float fit tings down struts N drag struts spreaders normally designed flexible enough withstand bending loads whereas full-scale fittings spread ers made withstand bending manned water flight wheeled dolly picks up entire aircraft using two pad ded rails slipped under spreaders just board floats hollow extruded alu minum spreaders filled wood ex panded foam simply keep col lapsing during ground handling fullscale down struts N struts pinjointed can carry tension com pression loads Side loads carried cable cross bracing Another cable stretched across front bollards serves footbridge afloat engine off course Since full-scale installation rigid need V bottomed configuration floats comes obvious float-equipped models down struts one-piece designed carry side loads N struts carry drag loads just full-scale applications spreaders holding floats parallel resisting separation loads Youll probably struck apparent flimsiness frame attaches floats model never cease amazed much system flexes both during ground handling water thats what makes work rigid youd breaking something time made not-so-gentle landings wed rather talk about As stuff get away envy full-scale operator Using back plans sketch fuselage cross section wing lead ing edge Draw float tops below fuselage centerlines floats should positioned half length apart Determine location hardbacks floats equipped sketch Draw down strut have ready-made floats attachfitting stock begin taking measure ments point fittings provided can t bent fit drawing make new ones Dont pressured working wrong size fittings just because came kit high-wing planes rear strut usually same dimension front positioned about three-fourths wing chord back Sig Cub excep tion its rear strut slightly longer fuselage bottom isnt horizontal between front rear down struts youll have draw another fuselage cross section rear strut attaches fashion slightly different rear strut Now comes fun part bending wire making struts use 5A2-dia wire planes under 3 lb %-dia air192 Model Aviation planes up 6 lb %2-dia wire ships up 10 lb quarter-scale machine like Cub will require Y18-dia wire must heated sufficient pliability Heat ing wire takes temper out bend doesnt seem create prob lems 40-size plane requires A-dia wire single 36-in-long piece will enough both struts After cutting wire Dremel cut off wheel marking masking tape move big vise hammer Using cardboard template made draw ings start banging pulling wire about six inches bend check bend against pattern usually overbending slightly pull back eliminate residual stresses Continuing other bends similar fashion end up two custom-made down struts make N struts wire size smaller used down struts larger size isnt necessary drag loads spreaders made out same-diameter wire down struts can wrapped No 24 copper wire soldered directly across bot toms prefer put bends end just inboard flats way rear N strut can wrapped si multaneously rear spreader Another type spreader prefer arrow shaft available several diameters 32 long use 4-in-dia shafts small planes /lh-dia shafts 40 through 60-size ma chines Fiberglass shafts virtually inde structible after drilling holes fit ting struts Fabrication sequence Review accom panying drawings familiarize yourself assembly procedure using ar row shaft spreader cut shafts spreader width Airplanes 40-size range usually take 16-in spreaders both spreaders can made shaft Drill holes down strut axles MAJERIOG catalog .a -$100 wS-- ff43LU1 RIDGE nnaa Hurricane VVV 25528 MACIUNERY& TOOLS P0 Boa 536-Y Lj 304-562-3538 otter complete selBctiOn lathes mills tools Aviation Modeler THE WIREMASTER em benderbooder extra large handle bends 1/81/4 coils 5/ 32-3/16 music wire Wire creep eliminated ANTI-KREEP WIRE LOCK free catalog has hundreds new items free micro bender offer JCM COMPANY 114 Washington Tert Waukegan IL 60085 Ii L:v Thone Aecnhat -ccscceosecane & inlid Ralsa Wiogs Wnng spat: 253/h aria 300 40 In. Engine 15 Co ends Twist drill elongate holes slit end shaft cut off wheel working hole partway edge File some notches axle ar eas down struts put tufts cot ton shafts just inboard holes Slide axle end hole has slit grasping firmly bend strut inserting other axle slit hole may find necessary bevel top axle aid insertion Mix up batch JB Weld warm up joint heat gun Using piece wire small nail coax JB Weld joint JB going argue rest assured itll go Put piece masking tape over end fit re maining axles using same procedure point youll need build fitting jig absolutely essential getting whole assembly straight Follow gen eral dimensions accompanying draw ing jig can made about 20 min utes table saw Lock spreader assemblies place jig fit solder N struts Since critical part job its important take time cer tain struts fit binding before wrapping soldering use coat hanger make master hangers bend easily course can afford waste couple getting shape just right youre completely satisfied use master pattern guide cutting bending N struts spreader assemblies still locked jig buff solder areas N strut ends wrap place No 24 copper wire Youll need about 20 copper wire joint Use sol dering gun torch intense heat torch would deposit carbon joint keep solder sticking After cleaning up soldered joints strut sembly ready mounting onto floats effective mounting method Please send 1 current ha catalog hating kite accessories Walt Moucha ModelsPO Box 1 12A 906-863-1225 e Menominee Ml 49858 WOSLOS 0100057 SCALE PHOTO OSSOtOS 000 0100 SACOS PLANS 3 vIEWS PLANS ENLAHONG SASE 5n1relfle 500*0 Jim Popinos Catalog 400 60 paqeSCALE PlANS ad PHOTO SEHOICE 3209 Mdtson GeenobOO NC 27403 phone ss2925239 NO collect Bob FiorenzeI Hobby Center Inc Dealer Yellow Aircraft Complete Line Mail Order Hobby Suppliea Now eveilable Feetoover Covering Materiel Visit Showroom 135 mm Disney WorIdi OmegalCool Power Fuels Discounted____ 420 Weet SR 434-407 3274353 winter Springe FL 32705 Fax 407 327-7143 place floats board lock down position strut assembly floats Attach latter small strapsor have exposed hardbacks through prepared holes Securing entire assembly airplane simply matter screwing appropriate size landing gear straps over down struts fu selage always mount strut first back out screws fill holes cyano acrylate CyA glue resecure screws Water rudders Whether airplane steers nose wheel taildragger making water rudders easy part former case replace nose wheel stub shaft extends 1/2 below fuselage install another steering arm Run length throttle cable steering arm along nose down N strut along length float tail-dragger hook length throttle cable rudder horn attach fuselage small aluminum clips tape Bend sleeve down past rear down strut along float securing two landing gear straps An extension below air rudder makes simplest water ruddersomewhat tackylooking effective 40-size model will require 3A2-dia wire reinforced lower air rudder hinge have subrudder make double duty running shaft extension through lower bearing reduce drag loads lower hinge air rudder kickup feature shown accompa nying drawing worth effort takes make allows rudder trail water kick up obstructions ground handling Goldberg Cub float kit incorporates feature Perhaps sufficient pressure readers Gold berg company might agree package sep arately modelers using different size floats Williams Brothers makes very small kickup unit must reworked operate freely requires steering arm extension make water rudder need A-in Du-Bro Goldberg nose wheel steer ing block stub shaft collar another arm little brass stock John Sullivan sug gests following rudder sizes matched indicated airplane sizes will effective job steering model through water 125 sq-in rudder 20-size planes 225 sq 40 325 sq 60 4 sq 90 45 sq in for 12-size models Although fullscale airplanes equipped two water rudders wont see paired installa tions models However should de cide use two rudders order improve turning moment use sizes indicated above Last Hints Department waterproof ing apply finger fillet clear silicone along juncture fuselage stabi lizer little around hinges Dont use silicone around steel struts its youre using may well kiss nuts goodbye ZAP LOCI ultimate thread-locking compound \MDrks metal wood plastic combination surlces Available ri medium blue label high green label strength ZAP THE TOTAL ADHESIVE SYSTEM pacer d Calbrida iSA PRODUCTS FOR ThE DISCERNING MODELER Complete Line Exhaust Systems d Pipes Muffled Tuned P10cm Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems IinsupaSi Woi October 1989 193 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX AH Designs61 AMA Membership13 Ace Radio Control11 Aerospace Composite Prod22 Aerotrol46 Air Flair20 Airline Supply Co50 Airtronics2 174 AI-Tec & Su-Pr-Line182 Altech Marketing175 177 Coy 3 American Sailplane Des162 B&P Associates4 BLB178 Quay Barber Models165 Big Sky153 Blue Ridge Mach & Tools192 Bolar Heli Research45 Bridi Aircraft9 Bru Line Industries61 Byron Originals22 83 183 CH Electronics46 Campbell Tools Co190 Campbells Custom Kits146 Carroll Consulting157 Channel 1 Productions165 Chicago Model Hobby Show181 Cleveland Model Supply12 Composite Aircraft Eng49 Control Systems Labs51 Coverite191 Cox Hobbies148 Craftsman Models Inc180 Crenshaw Aero57 Culpepper Models Inc188 Cygnet Software20 D&R Aircraft Mfg55 DGA Designs169 Doylejet190 Du-Bro Products Inc21 Duracraft180 E&G Enterprises184 Elden-Ken Electronics180 FHS Supply Inc18-19 Farnsworth & Elroy158 Fiorenze Hobby Center192 Fitzpatrick53 Flights Fancy Aeromodel188 Flyline Models .16 Fourmost Products178 Fults Dual Struts148 Futaba Corp America98-99 G&A Products 190 G&P Sales49 GM Precision Products180 Gas Model Products182 Gator RC Products166 Carl Goldberg Models23 92 Golden Gate Hobbies163 Philip Good Engine Repair10 Gorham Model Products12 Great American Hobbies16 Great Planes84 Paul K Guillow Inc59 High Sky163 Harry Higley & Sons189 Hobby Barn150-151 Hobby Dynamics17 105 179 Hobby Horn10 Hobby Lobby International 70-173 Hobby Woods57 Bob Holman Plans182 Hotel Harrington53 Ikon Northwest Co16 Indy RC Sales Inc154-156 JCM Company193 JR Radios105 179 JTec59 Larry Jolly Model Products51 Jomar20 K&B Mfg146 K&S Engineering153 Kalt17 Kingsway Enterprises167 Kraft Midwest162 Kustom Kraftsmanship164 Lone Star Models149 MACS Products193 MGA Enterprises57 Maral Technologies33 McDaniel RC Service55 Memphis Bell Classic190 Jim Messers176 Micro Mark6-7 Midwest Products. 1 Model Products Corp166 Model Rectifier CorpCoy 2 Walt Moucha Models193 Mutchlers Hobbies160-161 Nor-Ray Products Inc55 Northeast Aerodynamics4 Northeast Screen Graphics49 Pacer Tech97 176 188 193 Parrish Aircraft178 Pattern Tek168 John Peck Leisure Prod45 Peck-Polymers59 Penn Valley Hobby Center190 Perkins Avionics 148 Pica Products Plane Video 16 Planes & Things 168 Plasti-Kote Polks Hobby 90-91 Progress Mfg Co 44 QSAA 159 RAM59 RC Buyers Guide189 RC Designs 184 RC Extras191 RC Soaring Digest164 RJL Industries22 Radio South47 Ragan/Barker Group152 Red Max Fuel18-19 Robart37 Robbe Model Sport8 Rons Model Building12 Roun Tuit61 SAC 8 SR Batteries Safety Plus 4 22 Satellite City15 Scale Glider Components158 Scale Model Research192 Scale Plans & Photo Ser193 Sceptor Models32 Sermos RC Snap Connectors10 Shamrock Competition Imports47 Sheldons Hobby Shop20 Sig Mfg Co59 106-107 195 Bob Smith Industries46 163 Stangel Enterprises192 Star Kraft170 Superior Aircraft50 Sure Flite49 Suretech61 T&D Fiberglass Spec157 Tatone Products Co57 Tidewater Hobby Enterprises53 Todays Hobbies Inc45 Top Flite Models Inc108 Tower Hobbies185-187 Tru-Turn146 VL Products 12 WE Technical Services195 WW Models169 Wandit Mfg153 Williams Brothers167 Windsor Propeller Co37 World EnginesCover 4 Zenith Aviation5 very corrosive Skid fins battens flat-bottomed floats extending steps forward couple inches will give water rudder better leverage turning Spray rails deflect water inside bottom float away prop plastic tape find discount stores Radio Shack works very well Put strip along inboard fronts trim ex tend below chines Although four-stroke engines quite well prefer two-strokes because give better power-to-weight ratio Since long low-pitch props available wood theyre kind use Though chip two average season Ive found can trim off tip rebalance prop little loss fact discovered best prop 61 long-stroke acci dent cut /2 off 14 x 5 RevUp prop following prop/two-stroke matchups work best 10 x 4 20size engines 11 x 5 cut down 10 x 5 25 engines 11 x 5 12 x 4 can find 35-to-40 engines 13 x 5 14 x 5 cut down 13 x 5 60-size 194 Model Aviation engines however use Master Airscrew 10 x 6 North Star because length constraints after following suggestions find plane still wont lift off less 100 ft first make certain youre using seaplane prop isnt problem try following 1 remove little downthrust present 2 Put small shims under front down struts raise nose slightly youll see fullsize installations quite often offset power loss added weight drag floats causes 3 Go engine size larger always good idea first start building Very light planes like Seniorita will fly beautifully K&B 20 Sportster relatively heavy planes like Aero Stars really require big ger engine Ill wager once youve brought floatplane taxied right up shore youll wonder took long Go Model Float Manufacturers Ace R/C 116W t9th St PO Box 511 Higginsville MO 64037 Balsa USA PO Box 164 Marinette WS 54143 Beckman Floats Hobby Lobby Interna tional 5615 Franklin Pike Circle Brentwood TN 37027 Bill Westphal Floats Float Place 6301 234th Place SW Mountain Lake Ter race WA 98043 Carl Goldberg Models Inc 4734 West Chicago Ave Chicago IL 60651 Gee Bee Products PO Box 18 E Longmeadow MA 01028 Great Planes Model Mfr Co PO Box 721 Urbana IL 61801 John Sullivan Model Floatplane Products 1421 Second Street Callistoga CA 94515 Lens RC Enterprises Box 214 Mon trose BC Canada VOG lPO Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 sI KHAMPION 2-STROV IEK PINTQUART GALLON 0% Nitromethane $1075 5% Nitromethane $365$525$1275 10% Nitromethane $415$550$1475 15% Nitromethane $430$635$1675 25% Nitromethane $515$795$2195 35% Nitromethane $595$925$2695 10% Nitromethane$1425 15% Nitromethane$1625 -*/rn over 20 years SIG has blending finest quality model engine fuel available using st quality ingredients instance anol use 995% pure very best grade W money can buy also use real 100% pure t Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tam 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourself Prices subject change notice See aealer first available order direct Call _____ 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO IA 50171 Etfinger * says OnlyPlane Petterove Sets give assorted designs yoc WOt have selectod best classic dodges time noose choose fsm patfens tsr pan ae importans coclusive feature Golden Age Y Scale curtisa Hawk~ ength wingspan 2266 sq iv wing area 323 engines -4 channel RIC RCOS-14 8 /e Scale cuntiss Falcon I- \IA-A-J 83 length wing spae WI- 3t66sqinwingaea4ch RIG/ Y RCQS-t3 5 116 Scale cessna ing span sq wing area 26 66 engiens 43-4 channel RIG RC6S-t 8 113 Scale Piper cub J-3 11-9 wing span ength 2856 sq wing area 26 30 cid engines annel RIG RC3S-2 8 Quarter Scale WW SE-SA go wing span sq wing area 78 22 engines gCOS7 5 SPAD c-xlll 78 Ye spas 6 5s wing nine 13 1031 engines Capable flynt-it captores iwaginanion RCO6-8 5 FOKKER DR-i TRIPLANE 72 wing span sq wing area 78 166 engines RCOS-8 82495 SOPWITH CAMEL F1 84 wingspan 2t66 sq wisgareaett lhswloRIC Py wood ft balsa conettoction use 6$ sq 601 drawings RCOStt 5 N eWPiper Tn-Pacer PA-22 t 16-318 wing span sq wing area 20 30 cid esgines 4-h channel RIG nc t2 lbs 81116 scetall length Plswoodlbalsu fulselage removeable wing poonlo steerable nose wheel designed fo easy ground handling autbeotic scale tlight portormanve $C3S36299$ aill Effinger Feaediee Meerbar AMA NFFS Halt e$ Fame Prices $or camplele plans sub assembly aed detailed parts lists Add 8250 fee Mailing Tube Send ter brechure ahead 01 thu vrowd new boohun showing new Plan Sets 101986 Send St refundable 1st orderl WE TECHNICAL SERVICES PO Box 76884-A Atlanta GA 30328 October 1989 195
Edition: Model Aviation - 1989/10
Page Numbers: 93, 94, 95, 96, 191, 192, 193, 194, 195
IN MY PREVIOUS articles off-water flying concentrated identifying ba sic requirements activity discussed flying sites retrieval systems design parameters peculiar water concluding suggestions several models con vert nicely seaplanes present article follows up dis cussion float design strut assembly hardware design installation ex plains several modifications necessary setting up seaplane Although air plane capable taking off landing water generically defined seaplane emphasis will floatplane conver sions brief nod flying boats broad terms lets identify what good seaplane ought addition being waterproof aircraft should stable dur ing normal landings takeoffs moderate wind conditions should plane little no up elevator able turn across wind burying float Flying boats often suffer re spect because tip floats both too small too high arangement al lows strong crosswinds pick up wing bury opposite float During takeoff landing runouts good seaplane design should exhibit no ten dency porpoise symptom large cut away angles and/or short heels Finally well-designed seaplane floats will properly aligned airstream minimizes frontal area impact cruising speed Floats Full-scale airplanes equipped require floats will support about twice gross weight float lengths average about 83% fuselage length positioned approximately 44% centerline centerline lengths apart steps vary 47% 53% float lengths Fuselage float lengths usually about equal singlefloat craft dimensions stack up model world Pretty well actually Model airplanes seem quite well float length 75% fuselage buoy ancy factor 80% 100% greater total model weight fliS close-up snows inree %e x s-in spruce skid fins installed step improve on-step turning flat-bottomed floats Perhaps tacky some eyes simple ex tension air rudder still makes very ef fective water rudder lower hinge air rudder must however reinforced der compensate added drag loads arrive proper float length given model youll need some draw ing plans airplane Drop line vertically down 40% mean aerody namic chord MAC point another point lying one-third prop diameter ahead prop Twice distance tween two lines becomes float length should come out fairly close 75% fuselage length Youll notice step will positioned little rear center-of-gravity some reason have compro mise move step forward centerof-gravity rather moving tips back now have enough data obtain floats will fit model havent flown off-water before yourself favor purchase first floats Once youve gained some experience have better feel sizing may want design own names addresses float man ufacturers see listings end article Sending card should get brochure evaluating literature main factors consider length corres ponding weight range engine sizes youre lucky cost finishing floats key successful seaplaning obtain ing floats right length Since floats designed considerable buoy ancy reserve theyre long enough theyll support airplane host other fac tors however such time ability cost appearance may influence choice floats youre short time Gee Bee Beck man Westphal have ready-made floats sure check weight within prescribed limits molded floats tend heavier built-up ones cov ered foam As ability can build model floats piece cakeprovided dont get carried away covering process Floats need heavy Whats heavy 31-in 44-plywood-covered foam floats including attach fittings cover ing paint weigh 15 oz carry Se-TEIN& ARM /- A-~x rxr WAT PDR U Fo AA WAThR PA/ETI 0rA 5OLP6~ T0 TO VIEW left good close-up shot kickup rudder Sea Seniorita right drawing describing parts con struction details kickup feature quite worthwile protecting rudder against submerged obstructions especially ground handling size water rudder could have little larger however will turn airplane adequately light wind conditions 94 Model Aviation Left Close-up simple effective spray rail important keeping spray away prop Its nothing piece plastic tape found Radio Shack discount store Its installed inboard front floats extend about 1/8 below chines Right Throt tle cable used controlling water rudder seen wired N strut Note float vent made Nyrod protruding hardback typicai water rudder installation tfle back ot tne TlOt singie rudder usuaiiy quite aa equate models Suggested rudder sizes various model sizes listed text 1 1 1OAT 5rkJT5I 4I4c Ji& Left Detail drawing fitting jig used assemble float struts jig important enables strut assembly built true straight Right assembled float struts mounted jig successful strut system must lightweight flexible yet strong niorita all-up weight 74 oz 40-in floats same configuration weigh 2 lb ready go carry 95-lb Super Kadet However have another set 40-in floats Kadet builtup yet still weigh 2 lb Covered foam has twin advantages easier construction being less prone leaks still weighing same built-ups What cost Balsa USA sells 30in set around $12 set source weighs 7 oz apiece com plete doped silkspan Formula U Since Theyre built-up floats must sealed carefully foam core kits will cost twice Balsa USA price build ing time cut half Finally plastic molded floats heaviest ex pensive completely ready go box water 29-in Beckmans weigh 30 oz cost $77 plus shipping Gee Bee offers much less expensive alter native about $30 33-in set Gee Bee floats dont look much like fullscale counterparts work well shouldnt discounted Speaking appearance some folks care assembled float struts Sea Senior ita shown still mounted fitting jig shadows photograph can cause little confusion wire diameters used particular size airplane struts % N struts October 1989 95 4INGJ 6 ht & Up screams low flyby model will plane almost instantly application power Its equipped 31-in floats meet 750/o-of-the fuselage-length-rule Close-up full-scale Capri 2550 floats mounted Cessna 172 showing spray deflec tor keeps water away propeller during takeoff Also note sway cables under fuselage walk-across engine off course cables stretched across float tips about others dont modelers demand scale-looking floats oth ers simply want get off water Most us lie somewhere middle sug gestion go set floats closely matches airplane question realism youll find some full-scale floats bit clunky own right Note example flat tops slab sides Capri floats Cessna 172 shown photos Yes floats V-bottomed surfaces too flat rather curved manner Edo Pee Kay have Citabria floats resem bling Edos would really dress up Like full-scale brothers model floats either slab-sided variety D______ -iEC PiZ4LLl have single-curvature tops bottom sur faces however usually flat ease construction quick planing well minimize ground handling abrasion Theres no question however V bottomed floats have good scale appearance track well takeoff addition land ings accompanied slap flat surfaces produce choice yours Covering instructions cluded floats float kit dont pro vide much information covering fol lowing supplementary material might useful Appropriate covering materials run gamut plywood glass-and-resin balsa sheet MonoKote doped silkspan Formula U Ive tried have found plas tic film lightest film does tend loosen up however step area must carefully sealed Also bot tom sheet should applied last can lapped up sides prevent water seeping under edge Doped silkspan final painting Formula U works quite well achieving al much lightness plastic film Attractive trim designs easily applied over silkspan Glass-and-resin probably dur able method has beautiful finish painted glassing try spreading thin layer epoxy surface rolling float onto glass Smooth out apply second coat epoxy dry trick start sanding before epoxy has totally hardened allowing excess roll off surface clogging paper everything finished little trim stripe can really dress up ugly float Continued page 191 FL5FLl&PORPIAM FLOAT LN&tI-i LFL simplified drawing can help determining size position angles dimensions particular installation Refer text details working out own calculations H 5TL/T HEIGHT k Fl-I F- FLOAT L-eNGTh$ 96 Model Aviation ne autnors aaughter Lee Ann noaing inc 35-lb Step-Up model equipped 30-in built-up floats covered Mono Kote floats including fittings weigh 11 oz Getting up step requires some up elevator particular airplane dual water rudder actuating system modified Super Kadet almost hidden Slimline Pius-style muffler Two water rudders necessary particular installation Completed struts mounted set Balsa USA 30-in floats glassed ready painting AMA District VI VP Burgin KY trusty Associate VP Ron Ballard Decatur IN both hand greet modelers AMA booth Jim presented South Bend RC Club AMA Award Service recognition its con tinued efforts staging Pot-O-Gold show recognition extraordinary nature its accomplishments plaque states Pot-O-Gold So much lit tle time Club President Ron Vander Molen accepted plaque behalf SBRC Club separate awards ceremony Jim Sears presented 25-Year Service Award plaque Tn-Valley RC Club Club president Bob Kyle accepted award TnValley South Bend RC groups sister clubs representing best interests mod elers both north south sides South Bend St Joseph County memberships span border area between AMA districts VI VII Throughout two-day show SBRC maintained solid frequency control coor dinated demonstration activity mishap occurred event coordinator constant contact scannerequipped control center D&J Electronics Howell MI also assisted frequency control during busy periods SBRC Club delighted receive participation four corners USA broad array dealers man ufacturers hobby-related businesses 75 alloccupying 118 booths state Washington California New York Florida represented Hazel Sig Hester promised display full-size Space Walker next year Midwest well known density its modeling popu lation considerable percentage resides within 150-mile radius South Bend demographics like SBRC Club poised greater growth its future Pot-O-Gold shows Floats-Fitti ngs/Westwood Continued page 96 Correct positioning floats model important Positioning must worked out before mounting fittings considered youll need re turn plans adding sketch made determine float length Starting airplanes prop its cor rect position take 15% prop diameter measure distance below bottom prop Draw line parallel longitudinal axis fuselage marks position top floats Seniorita using 10 x 4 10 x 5 prop top floats will 1 bottom prop An Eagle 63 turning 11 x 5 prop will require dis tance 1% Position step 40% MACor 40% chord wing rectangu lar everything done correctly youll have fairly conventional installation no surprises tips floats should about half little less prop di ameter forward prop Obviously farther forward bows better planing characteristics crucial point have enough float forward prop stopping short excessive amount Both Seniorita Light & Up have 31-in floats meet 75% rule application power no elevator control floats get plane almost im mediately task remains draw position hardbacks Most built-up floats will have internal hardbacks have type youre home free since can install spreaders anywhere please Exposed hardbacks used floats such Gee Bee require careful planning Though still allow consid erable adjustment youll need determine location exposed hardbacks beforehand draw Fittings can now considered almost designs fittings Newest Ailane Full Size Aerobatic World. .Now Available Three Size Model Kits EXTRA 230 Gtandoff Scala 33% 96 Span Wing Awe 1300 St 30% 87 Span Wing Am 117 sq 25% 75 Span Wing Aa 558 sq 229 1 $15 ship 219 I-i $l5shipl 179 hip October 1989 191 magnificently crafted tool reduces temperature drift 50 ciZ7~ THE BLACK BARON IRON Advanced hi-tech thermostat reduces temperature drift 50 Ordinary irons vary up 400 Exclusive roil bars fit fillets & under cambers Flat sole bevelled edges provides constant heat marks Coating 100% Blackstone big improvement over lessBoNus! expensive coatings slides almost noTwo stands adhesive ui1u ruy magnificent tooincluding j,j TI1ethat attaches iron Iont have CGVERE look 420 Babylon Rd Horsham PA 19044 100% Blackstone coating slides like butter Exclusive roll-bars roll fillets & undercambers responding advertisers mention read about ModelAviation G Duane Coles T- 199 1 SlOshipping R/C EXTRAS 1404 Vandenburg Cir W Sergeant Bluff IA 51054 Phone 1 712 943 4102 Cash Money Orden Ceditied Chenh VISA o \IZI1MasCad oceptdNo COD Odes lJ *PwyonM Cheohn two weeks HANGAR-7 R/C & C/L MODELS Proffesional Neans quality Results Cozoenpietre Lzit PreCut AAA Balsa & Ply PrePorned Landing Gear Spruce & Maple Bond PoIISone Rolled Plans Instructions Wheels Controls Etc Rot Included P1crcs PJnas Kitr ahove escept UCUT parts 00th handy teoplate cheet provided C P1nnas Otoly Foilsize rolled plans template sheet instractoons shlpped first class nail Free Catalog $59 $35 C $11 RIO cORSAIR 25 Distinctive lieU Wins Pavorite SemiScale Wong Span ii Wing Area iSO Sq Length 341/2 Loading II Sz/Sq Pt Weight 31/20 Engine 25 Co In. Radio iChannel Std B $25 C $7 B/C iJORtIET 074 Spurt Bipi. ~ldnl Wing Span 27 Bong Area 27i Sq In. Length 25 Loading 13 Sn Sq Pt. Weight 11/20 Engine 074 Coo Qaeen Bee Radio iChannel Micro Servos $49 B $30 C $9 B/C ALLcICAIi Ii AileronOF Spurt PlyrcI Wing Span Wing Area 375 sq on. LesEth 351/2 Weight 20 $25 C $9 Profile Fuselage & InsltUp Sheeted Wing Wing Span 58I/i Area 540 Sq In. Engi:e iS $39 $25 C $9 C/LI CESSNA AEROBAT 35 Enique lepreunive Sight Profile Faselage & Boiltip Sheeted Wing wing Span 52 Area iii Sq togise 35 Stunt C/LI hEIR 2 ecU Plyer/Tcaieect ciScUp Sheeted Wiogs selage Wing Span$ 1 3 II Area 200 Sq Engine 15 Cu In ntroductory prices above good until Oct 1 1989 ORDER YOURS TODAY Pleane add $4 shipping & handling 3 Send chech money order VISA & MC accepted Gice sreet addrons kiln nod phone credit cardt GEL ENTERPRISES P Q BOX 336 PB 414 5454172 WAUKESHA WISCONSIN 53187-0336 MEMBEREAA AC models real key simplic ity Simple fittings properly made will give maximum lightness strength have attractive appear ance major differences between fullscale model fittings model float fit tings down struts N drag struts spreaders normally designed flexible enough withstand bending loads whereas full-scale fittings spread ers made withstand bending manned water flight wheeled dolly picks up entire aircraft using two pad ded rails slipped under spreaders just board floats hollow extruded alu minum spreaders filled wood ex panded foam simply keep col lapsing during ground handling fullscale down struts N struts pinjointed can carry tension com pression loads Side loads carried cable cross bracing Another cable stretched across front bollards serves footbridge afloat engine off course Since full-scale installation rigid need V bottomed configuration floats comes obvious float-equipped models down struts one-piece designed carry side loads N struts carry drag loads just full-scale applications spreaders holding floats parallel resisting separation loads Youll probably struck apparent flimsiness frame attaches floats model never cease amazed much system flexes both during ground handling water thats what makes work rigid youd breaking something time made not-so-gentle landings wed rather talk about As stuff get away envy full-scale operator Using back plans sketch fuselage cross section wing lead ing edge Draw float tops below fuselage centerlines floats should positioned half length apart Determine location hardbacks floats equipped sketch Draw down strut have ready-made floats attachfitting stock begin taking measure ments point fittings provided can t bent fit drawing make new ones Dont pressured working wrong size fittings just because came kit high-wing planes rear strut usually same dimension front positioned about three-fourths wing chord back Sig Cub excep tion its rear strut slightly longer fuselage bottom isnt horizontal between front rear down struts youll have draw another fuselage cross section rear strut attaches fashion slightly different rear strut Now comes fun part bending wire making struts use 5A2-dia wire planes under 3 lb %-dia air192 Model Aviation planes up 6 lb %2-dia wire ships up 10 lb quarter-scale machine like Cub will require Y18-dia wire must heated sufficient pliability Heat ing wire takes temper out bend doesnt seem create prob lems 40-size plane requires A-dia wire single 36-in-long piece will enough both struts After cutting wire Dremel cut off wheel marking masking tape move big vise hammer Using cardboard template made draw ings start banging pulling wire about six inches bend check bend against pattern usually overbending slightly pull back eliminate residual stresses Continuing other bends similar fashion end up two custom-made down struts make N struts wire size smaller used down struts larger size isnt necessary drag loads spreaders made out same-diameter wire down struts can wrapped No 24 copper wire soldered directly across bot toms prefer put bends end just inboard flats way rear N strut can wrapped si multaneously rear spreader Another type spreader prefer arrow shaft available several diameters 32 long use 4-in-dia shafts small planes /lh-dia shafts 40 through 60-size ma chines Fiberglass shafts virtually inde structible after drilling holes fit ting struts Fabrication sequence Review accom panying drawings familiarize yourself assembly procedure using ar row shaft spreader cut shafts spreader width Airplanes 40-size range usually take 16-in spreaders both spreaders can made shaft Drill holes down strut axles MAJERIOG catalog .a -$100 wS-- ff43LU1 RIDGE nnaa Hurricane VVV 25528 MACIUNERY& TOOLS P0 Boa 536-Y Lj 304-562-3538 otter complete selBctiOn lathes mills tools Aviation Modeler THE WIREMASTER em benderbooder extra large handle bends 1/81/4 coils 5/ 32-3/16 music wire Wire creep eliminated ANTI-KREEP WIRE LOCK free catalog has hundreds new items free micro bender offer JCM COMPANY 114 Washington Tert Waukegan IL 60085 Ii L:v Thone Aecnhat -ccscceosecane & inlid Ralsa Wiogs Wnng spat: 253/h aria 300 40 In. Engine 15 Co ends Twist drill elongate holes slit end shaft cut off wheel working hole partway edge File some notches axle ar eas down struts put tufts cot ton shafts just inboard holes Slide axle end hole has slit grasping firmly bend strut inserting other axle slit hole may find necessary bevel top axle aid insertion Mix up batch JB Weld warm up joint heat gun Using piece wire small nail coax JB Weld joint JB going argue rest assured itll go Put piece masking tape over end fit re maining axles using same procedure point youll need build fitting jig absolutely essential getting whole assembly straight Follow gen eral dimensions accompanying draw ing jig can made about 20 min utes table saw Lock spreader assemblies place jig fit solder N struts Since critical part job its important take time cer tain struts fit binding before wrapping soldering use coat hanger make master hangers bend easily course can afford waste couple getting shape just right youre completely satisfied use master pattern guide cutting bending N struts spreader assemblies still locked jig buff solder areas N strut ends wrap place No 24 copper wire Youll need about 20 copper wire joint Use sol dering gun torch intense heat torch would deposit carbon joint keep solder sticking After cleaning up soldered joints strut sembly ready mounting onto floats effective mounting method Please send 1 current ha catalog hating kite accessories Walt Moucha ModelsPO Box 1 12A 906-863-1225 e Menominee Ml 49858 WOSLOS 0100057 SCALE PHOTO OSSOtOS 000 0100 SACOS PLANS 3 vIEWS PLANS ENLAHONG SASE 5n1relfle 500*0 Jim Popinos Catalog 400 60 paqeSCALE PlANS ad PHOTO SEHOICE 3209 Mdtson GeenobOO NC 27403 phone ss2925239 NO collect Bob FiorenzeI Hobby Center Inc Dealer Yellow Aircraft Complete Line Mail Order Hobby Suppliea Now eveilable Feetoover Covering Materiel Visit Showroom 135 mm Disney WorIdi OmegalCool Power Fuels Discounted____ 420 Weet SR 434-407 3274353 winter Springe FL 32705 Fax 407 327-7143 place floats board lock down position strut assembly floats Attach latter small strapsor have exposed hardbacks through prepared holes Securing entire assembly airplane simply matter screwing appropriate size landing gear straps over down struts fu selage always mount strut first back out screws fill holes cyano acrylate CyA glue resecure screws Water rudders Whether airplane steers nose wheel taildragger making water rudders easy part former case replace nose wheel stub shaft extends 1/2 below fuselage install another steering arm Run length throttle cable steering arm along nose down N strut along length float tail-dragger hook length throttle cable rudder horn attach fuselage small aluminum clips tape Bend sleeve down past rear down strut along float securing two landing gear straps An extension below air rudder makes simplest water ruddersomewhat tackylooking effective 40-size model will require 3A2-dia wire reinforced lower air rudder hinge have subrudder make double duty running shaft extension through lower bearing reduce drag loads lower hinge air rudder kickup feature shown accompa nying drawing worth effort takes make allows rudder trail water kick up obstructions ground handling Goldberg Cub float kit incorporates feature Perhaps sufficient pressure readers Gold berg company might agree package sep arately modelers using different size floats Williams Brothers makes very small kickup unit must reworked operate freely requires steering arm extension make water rudder need A-in Du-Bro Goldberg nose wheel steer ing block stub shaft collar another arm little brass stock John Sullivan sug gests following rudder sizes matched indicated airplane sizes will effective job steering model through water 125 sq-in rudder 20-size planes 225 sq 40 325 sq 60 4 sq 90 45 sq in for 12-size models Although fullscale airplanes equipped two water rudders wont see paired installa tions models However should de cide use two rudders order improve turning moment use sizes indicated above Last Hints Department waterproof ing apply finger fillet clear silicone along juncture fuselage stabi lizer little around hinges Dont use silicone around steel struts its youre using may well kiss nuts goodbye ZAP LOCI ultimate thread-locking compound \MDrks metal wood plastic combination surlces Available ri medium blue label high green label strength ZAP THE TOTAL ADHESIVE SYSTEM pacer d Calbrida iSA PRODUCTS FOR ThE DISCERNING MODELER Complete Line Exhaust Systems d Pipes Muffled Tuned P10cm Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems IinsupaSi Woi October 1989 193 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX AH Designs61 AMA Membership13 Ace Radio Control11 Aerospace Composite Prod22 Aerotrol46 Air Flair20 Airline Supply Co50 Airtronics2 174 AI-Tec & Su-Pr-Line182 Altech Marketing175 177 Coy 3 American Sailplane Des162 B&P Associates4 BLB178 Quay Barber Models165 Big Sky153 Blue Ridge Mach & Tools192 Bolar Heli Research45 Bridi Aircraft9 Bru Line Industries61 Byron Originals22 83 183 CH Electronics46 Campbell Tools Co190 Campbells Custom Kits146 Carroll Consulting157 Channel 1 Productions165 Chicago Model Hobby Show181 Cleveland Model Supply12 Composite Aircraft Eng49 Control Systems Labs51 Coverite191 Cox Hobbies148 Craftsman Models Inc180 Crenshaw Aero57 Culpepper Models Inc188 Cygnet Software20 D&R Aircraft Mfg55 DGA Designs169 Doylejet190 Du-Bro Products Inc21 Duracraft180 E&G Enterprises184 Elden-Ken Electronics180 FHS Supply Inc18-19 Farnsworth & Elroy158 Fiorenze Hobby Center192 Fitzpatrick53 Flights Fancy Aeromodel188 Flyline Models .16 Fourmost Products178 Fults Dual Struts148 Futaba Corp America98-99 G&A Products 190 G&P Sales49 GM Precision Products180 Gas Model Products182 Gator RC Products166 Carl Goldberg Models23 92 Golden Gate Hobbies163 Philip Good Engine Repair10 Gorham Model Products12 Great American Hobbies16 Great Planes84 Paul K Guillow Inc59 High Sky163 Harry Higley & Sons189 Hobby Barn150-151 Hobby Dynamics17 105 179 Hobby Horn10 Hobby Lobby International 70-173 Hobby Woods57 Bob Holman Plans182 Hotel Harrington53 Ikon Northwest Co16 Indy RC Sales Inc154-156 JCM Company193 JR Radios105 179 JTec59 Larry Jolly Model Products51 Jomar20 K&B Mfg146 K&S Engineering153 Kalt17 Kingsway Enterprises167 Kraft Midwest162 Kustom Kraftsmanship164 Lone Star Models149 MACS Products193 MGA Enterprises57 Maral Technologies33 McDaniel RC Service55 Memphis Bell Classic190 Jim Messers176 Micro Mark6-7 Midwest Products. 1 Model Products Corp166 Model Rectifier CorpCoy 2 Walt Moucha Models193 Mutchlers Hobbies160-161 Nor-Ray Products Inc55 Northeast Aerodynamics4 Northeast Screen Graphics49 Pacer Tech97 176 188 193 Parrish Aircraft178 Pattern Tek168 John Peck Leisure Prod45 Peck-Polymers59 Penn Valley Hobby Center190 Perkins Avionics 148 Pica Products Plane Video 16 Planes & Things 168 Plasti-Kote Polks Hobby 90-91 Progress Mfg Co 44 QSAA 159 RAM59 RC Buyers Guide189 RC Designs 184 RC Extras191 RC Soaring Digest164 RJL Industries22 Radio South47 Ragan/Barker Group152 Red Max Fuel18-19 Robart37 Robbe Model Sport8 Rons Model Building12 Roun Tuit61 SAC 8 SR Batteries Safety Plus 4 22 Satellite City15 Scale Glider Components158 Scale Model Research192 Scale Plans & Photo Ser193 Sceptor Models32 Sermos RC Snap Connectors10 Shamrock Competition Imports47 Sheldons Hobby Shop20 Sig Mfg Co59 106-107 195 Bob Smith Industries46 163 Stangel Enterprises192 Star Kraft170 Superior Aircraft50 Sure Flite49 Suretech61 T&D Fiberglass Spec157 Tatone Products Co57 Tidewater Hobby Enterprises53 Todays Hobbies Inc45 Top Flite Models Inc108 Tower Hobbies185-187 Tru-Turn146 VL Products 12 WE Technical Services195 WW Models169 Wandit Mfg153 Williams Brothers167 Windsor Propeller Co37 World EnginesCover 4 Zenith Aviation5 very corrosive Skid fins battens flat-bottomed floats extending steps forward couple inches will give water rudder better leverage turning Spray rails deflect water inside bottom float away prop plastic tape find discount stores Radio Shack works very well Put strip along inboard fronts trim ex tend below chines Although four-stroke engines quite well prefer two-strokes because give better power-to-weight ratio Since long low-pitch props available wood theyre kind use Though chip two average season Ive found can trim off tip rebalance prop little loss fact discovered best prop 61 long-stroke acci dent cut /2 off 14 x 5 RevUp prop following prop/two-stroke matchups work best 10 x 4 20size engines 11 x 5 cut down 10 x 5 25 engines 11 x 5 12 x 4 can find 35-to-40 engines 13 x 5 14 x 5 cut down 13 x 5 60-size 194 Model Aviation engines however use Master Airscrew 10 x 6 North Star because length constraints after following suggestions find plane still wont lift off less 100 ft first make certain youre using seaplane prop isnt problem try following 1 remove little downthrust present 2 Put small shims under front down struts raise nose slightly youll see fullsize installations quite often offset power loss added weight drag floats causes 3 Go engine size larger always good idea first start building Very light planes like Seniorita will fly beautifully K&B 20 Sportster relatively heavy planes like Aero Stars really require big ger engine Ill wager once youve brought floatplane taxied right up shore youll wonder took long Go Model Float Manufacturers Ace R/C 116W t9th St PO Box 511 Higginsville MO 64037 Balsa USA PO Box 164 Marinette WS 54143 Beckman Floats Hobby Lobby Interna tional 5615 Franklin Pike Circle Brentwood TN 37027 Bill Westphal Floats Float Place 6301 234th Place SW Mountain Lake Ter race WA 98043 Carl Goldberg Models Inc 4734 West Chicago Ave Chicago IL 60651 Gee Bee Products PO Box 18 E Longmeadow MA 01028 Great Planes Model Mfr Co PO Box 721 Urbana IL 61801 John Sullivan Model Floatplane Products 1421 Second Street Callistoga CA 94515 Lens RC Enterprises Box 214 Mon trose BC Canada VOG lPO Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 sI KHAMPION 2-STROV IEK PINTQUART GALLON 0% Nitromethane $1075 5% Nitromethane $365$525$1275 10% Nitromethane $415$550$1475 15% Nitromethane $430$635$1675 25% Nitromethane $515$795$2195 35% Nitromethane $595$925$2695 10% Nitromethane$1425 15% Nitromethane$1625 -*/rn over 20 years SIG has blending finest quality model engine fuel available using st quality ingredients instance anol use 995% pure very best grade W money can buy also use real 100% pure t Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tam 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourself Prices subject change notice See aealer first available order direct Call _____ 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO IA 50171 Etfinger * says OnlyPlane Petterove Sets give assorted designs yoc WOt have selectod best classic dodges time noose choose fsm patfens tsr pan ae importans coclusive feature Golden Age Y Scale curtisa Hawk~ ength wingspan 2266 sq iv wing area 323 engines -4 channel RIC RCOS-14 8 /e Scale cuntiss Falcon I- \IA-A-J 83 length wing spae WI- 3t66sqinwingaea4ch RIG/ Y RCQS-t3 5 116 Scale cessna ing span sq wing area 26 66 engiens 43-4 channel RIG RC6S-t 8 113 Scale Piper cub J-3 11-9 wing span ength 2856 sq wing area 26 30 cid engines annel RIG RC3S-2 8 Quarter Scale WW SE-SA go wing span sq wing area 78 22 engines gCOS7 5 SPAD c-xlll 78 Ye spas 6 5s wing nine 13 1031 engines Capable flynt-it captores iwaginanion RCO6-8 5 FOKKER DR-i TRIPLANE 72 wing span sq wing area 78 166 engines RCOS-8 82495 SOPWITH CAMEL F1 84 wingspan 2t66 sq wisgareaett lhswloRIC Py wood ft balsa conettoction use 6$ sq 601 drawings RCOStt 5 N eWPiper Tn-Pacer PA-22 t 16-318 wing span sq wing area 20 30 cid esgines 4-h channel RIG nc t2 lbs 81116 scetall length Plswoodlbalsu fulselage removeable wing poonlo steerable nose wheel designed fo easy ground handling autbeotic scale tlight portormanve $C3S36299$ aill Effinger Feaediee Meerbar AMA NFFS Halt e$ Fame Prices $or camplele plans sub assembly aed detailed parts lists Add 8250 fee Mailing Tube Send ter brechure ahead 01 thu vrowd new boohun showing new Plan Sets 101986 Send St refundable 1st orderl WE TECHNICAL SERVICES PO Box 76884-A Atlanta GA 30328 October 1989 195
Edition: Model Aviation - 1989/10
Page Numbers: 93, 94, 95, 96, 191, 192, 193, 194, 195
IN MY PREVIOUS articles off-water flying concentrated identifying ba sic requirements activity discussed flying sites retrieval systems design parameters peculiar water concluding suggestions several models con vert nicely seaplanes present article follows up dis cussion float design strut assembly hardware design installation ex plains several modifications necessary setting up seaplane Although air plane capable taking off landing water generically defined seaplane emphasis will floatplane conver sions brief nod flying boats broad terms lets identify what good seaplane ought addition being waterproof aircraft should stable dur ing normal landings takeoffs moderate wind conditions should plane little no up elevator able turn across wind burying float Flying boats often suffer re spect because tip floats both too small too high arangement al lows strong crosswinds pick up wing bury opposite float During takeoff landing runouts good seaplane design should exhibit no ten dency porpoise symptom large cut away angles and/or short heels Finally well-designed seaplane floats will properly aligned airstream minimizes frontal area impact cruising speed Floats Full-scale airplanes equipped require floats will support about twice gross weight float lengths average about 83% fuselage length positioned approximately 44% centerline centerline lengths apart steps vary 47% 53% float lengths Fuselage float lengths usually about equal singlefloat craft dimensions stack up model world Pretty well actually Model airplanes seem quite well float length 75% fuselage buoy ancy factor 80% 100% greater total model weight fliS close-up snows inree %e x s-in spruce skid fins installed step improve on-step turning flat-bottomed floats Perhaps tacky some eyes simple ex tension air rudder still makes very ef fective water rudder lower hinge air rudder must however reinforced der compensate added drag loads arrive proper float length given model youll need some draw ing plans airplane Drop line vertically down 40% mean aerody namic chord MAC point another point lying one-third prop diameter ahead prop Twice distance tween two lines becomes float length should come out fairly close 75% fuselage length Youll notice step will positioned little rear center-of-gravity some reason have compro mise move step forward centerof-gravity rather moving tips back now have enough data obtain floats will fit model havent flown off-water before yourself favor purchase first floats Once youve gained some experience have better feel sizing may want design own names addresses float man ufacturers see listings end article Sending card should get brochure evaluating literature main factors consider length corres ponding weight range engine sizes youre lucky cost finishing floats key successful seaplaning obtain ing floats right length Since floats designed considerable buoy ancy reserve theyre long enough theyll support airplane host other fac tors however such time ability cost appearance may influence choice floats youre short time Gee Bee Beck man Westphal have ready-made floats sure check weight within prescribed limits molded floats tend heavier built-up ones cov ered foam As ability can build model floats piece cakeprovided dont get carried away covering process Floats need heavy Whats heavy 31-in 44-plywood-covered foam floats including attach fittings cover ing paint weigh 15 oz carry Se-TEIN& ARM /- A-~x rxr WAT PDR U Fo AA WAThR PA/ETI 0rA 5OLP6~ T0 TO VIEW left good close-up shot kickup rudder Sea Seniorita right drawing describing parts con struction details kickup feature quite worthwile protecting rudder against submerged obstructions especially ground handling size water rudder could have little larger however will turn airplane adequately light wind conditions 94 Model Aviation Left Close-up simple effective spray rail important keeping spray away prop Its nothing piece plastic tape found Radio Shack discount store Its installed inboard front floats extend about 1/8 below chines Right Throt tle cable used controlling water rudder seen wired N strut Note float vent made Nyrod protruding hardback typicai water rudder installation tfle back ot tne TlOt singie rudder usuaiiy quite aa equate models Suggested rudder sizes various model sizes listed text 1 1 1OAT 5rkJT5I 4I4c Ji& Left Detail drawing fitting jig used assemble float struts jig important enables strut assembly built true straight Right assembled float struts mounted jig successful strut system must lightweight flexible yet strong niorita all-up weight 74 oz 40-in floats same configuration weigh 2 lb ready go carry 95-lb Super Kadet However have another set 40-in floats Kadet builtup yet still weigh 2 lb Covered foam has twin advantages easier construction being less prone leaks still weighing same built-ups What cost Balsa USA sells 30in set around $12 set source weighs 7 oz apiece com plete doped silkspan Formula U Since Theyre built-up floats must sealed carefully foam core kits will cost twice Balsa USA price build ing time cut half Finally plastic molded floats heaviest ex pensive completely ready go box water 29-in Beckmans weigh 30 oz cost $77 plus shipping Gee Bee offers much less expensive alter native about $30 33-in set Gee Bee floats dont look much like fullscale counterparts work well shouldnt discounted Speaking appearance some folks care assembled float struts Sea Senior ita shown still mounted fitting jig shadows photograph can cause little confusion wire diameters used particular size airplane struts % N struts October 1989 95 4INGJ 6 ht & Up screams low flyby model will plane almost instantly application power Its equipped 31-in floats meet 750/o-of-the fuselage-length-rule Close-up full-scale Capri 2550 floats mounted Cessna 172 showing spray deflec tor keeps water away propeller during takeoff Also note sway cables under fuselage walk-across engine off course cables stretched across float tips about others dont modelers demand scale-looking floats oth ers simply want get off water Most us lie somewhere middle sug gestion go set floats closely matches airplane question realism youll find some full-scale floats bit clunky own right Note example flat tops slab sides Capri floats Cessna 172 shown photos Yes floats V-bottomed surfaces too flat rather curved manner Edo Pee Kay have Citabria floats resem bling Edos would really dress up Like full-scale brothers model floats either slab-sided variety D______ -iEC PiZ4LLl have single-curvature tops bottom sur faces however usually flat ease construction quick planing well minimize ground handling abrasion Theres no question however V bottomed floats have good scale appearance track well takeoff addition land ings accompanied slap flat surfaces produce choice yours Covering instructions cluded floats float kit dont pro vide much information covering fol lowing supplementary material might useful Appropriate covering materials run gamut plywood glass-and-resin balsa sheet MonoKote doped silkspan Formula U Ive tried have found plas tic film lightest film does tend loosen up however step area must carefully sealed Also bot tom sheet should applied last can lapped up sides prevent water seeping under edge Doped silkspan final painting Formula U works quite well achieving al much lightness plastic film Attractive trim designs easily applied over silkspan Glass-and-resin probably dur able method has beautiful finish painted glassing try spreading thin layer epoxy surface rolling float onto glass Smooth out apply second coat epoxy dry trick start sanding before epoxy has totally hardened allowing excess roll off surface clogging paper everything finished little trim stripe can really dress up ugly float Continued page 191 FL5FLl&PORPIAM FLOAT LN&tI-i LFL simplified drawing can help determining size position angles dimensions particular installation Refer text details working out own calculations H 5TL/T HEIGHT k Fl-I F- FLOAT L-eNGTh$ 96 Model Aviation ne autnors aaughter Lee Ann noaing inc 35-lb Step-Up model equipped 30-in built-up floats covered Mono Kote floats including fittings weigh 11 oz Getting up step requires some up elevator particular airplane dual water rudder actuating system modified Super Kadet almost hidden Slimline Pius-style muffler Two water rudders necessary particular installation Completed struts mounted set Balsa USA 30-in floats glassed ready painting AMA District VI VP Burgin KY trusty Associate VP Ron Ballard Decatur IN both hand greet modelers AMA booth Jim presented South Bend RC Club AMA Award Service recognition its con tinued efforts staging Pot-O-Gold show recognition extraordinary nature its accomplishments plaque states Pot-O-Gold So much lit tle time Club President Ron Vander Molen accepted plaque behalf SBRC Club separate awards ceremony Jim Sears presented 25-Year Service Award plaque Tn-Valley RC Club Club president Bob Kyle accepted award TnValley South Bend RC groups sister clubs representing best interests mod elers both north south sides South Bend St Joseph County memberships span border area between AMA districts VI VII Throughout two-day show SBRC maintained solid frequency control coor dinated demonstration activity mishap occurred event coordinator constant contact scannerequipped control center D&J Electronics Howell MI also assisted frequency control during busy periods SBRC Club delighted receive participation four corners USA broad array dealers man ufacturers hobby-related businesses 75 alloccupying 118 booths state Washington California New York Florida represented Hazel Sig Hester promised display full-size Space Walker next year Midwest well known density its modeling popu lation considerable percentage resides within 150-mile radius South Bend demographics like SBRC Club poised greater growth its future Pot-O-Gold shows Floats-Fitti ngs/Westwood Continued page 96 Correct positioning floats model important Positioning must worked out before mounting fittings considered youll need re turn plans adding sketch made determine float length Starting airplanes prop its cor rect position take 15% prop diameter measure distance below bottom prop Draw line parallel longitudinal axis fuselage marks position top floats Seniorita using 10 x 4 10 x 5 prop top floats will 1 bottom prop An Eagle 63 turning 11 x 5 prop will require dis tance 1% Position step 40% MACor 40% chord wing rectangu lar everything done correctly youll have fairly conventional installation no surprises tips floats should about half little less prop di ameter forward prop Obviously farther forward bows better planing characteristics crucial point have enough float forward prop stopping short excessive amount Both Seniorita Light & Up have 31-in floats meet 75% rule application power no elevator control floats get plane almost im mediately task remains draw position hardbacks Most built-up floats will have internal hardbacks have type youre home free since can install spreaders anywhere please Exposed hardbacks used floats such Gee Bee require careful planning Though still allow consid erable adjustment youll need determine location exposed hardbacks beforehand draw Fittings can now considered almost designs fittings Newest Ailane Full Size Aerobatic World. .Now Available Three Size Model Kits EXTRA 230 Gtandoff Scala 33% 96 Span Wing Awe 1300 St 30% 87 Span Wing Am 117 sq 25% 75 Span Wing Aa 558 sq 229 1 $15 ship 219 I-i $l5shipl 179 hip October 1989 191 magnificently crafted tool reduces temperature drift 50 ciZ7~ THE BLACK BARON IRON Advanced hi-tech thermostat reduces temperature drift 50 Ordinary irons vary up 400 Exclusive roil bars fit fillets & under cambers Flat sole bevelled edges provides constant heat marks Coating 100% Blackstone big improvement over lessBoNus! expensive coatings slides almost noTwo stands adhesive ui1u ruy magnificent tooincluding j,j TI1ethat attaches iron Iont have CGVERE look 420 Babylon Rd Horsham PA 19044 100% Blackstone coating slides like butter Exclusive roll-bars roll fillets & undercambers responding advertisers mention read about ModelAviation G Duane Coles T- 199 1 SlOshipping R/C EXTRAS 1404 Vandenburg Cir W Sergeant Bluff IA 51054 Phone 1 712 943 4102 Cash Money Orden Ceditied Chenh VISA o \IZI1MasCad oceptdNo COD Odes lJ *PwyonM Cheohn two weeks HANGAR-7 R/C & C/L MODELS Proffesional Neans quality Results Cozoenpietre Lzit PreCut AAA Balsa & Ply PrePorned Landing Gear Spruce & Maple Bond PoIISone Rolled Plans Instructions Wheels Controls Etc Rot Included P1crcs PJnas Kitr ahove escept UCUT parts 00th handy teoplate cheet provided C P1nnas Otoly Foilsize rolled plans template sheet instractoons shlpped first class nail Free Catalog $59 $35 C $11 RIO cORSAIR 25 Distinctive lieU Wins Pavorite SemiScale Wong Span ii Wing Area iSO Sq Length 341/2 Loading II Sz/Sq Pt Weight 31/20 Engine 25 Co In. Radio iChannel Std B $25 C $7 B/C iJORtIET 074 Spurt Bipi. ~ldnl Wing Span 27 Bong Area 27i Sq In. Length 25 Loading 13 Sn Sq Pt. Weight 11/20 Engine 074 Coo Qaeen Bee Radio iChannel Micro Servos $49 B $30 C $9 B/C ALLcICAIi Ii AileronOF Spurt PlyrcI Wing Span Wing Area 375 sq on. LesEth 351/2 Weight 20 $25 C $9 Profile Fuselage & InsltUp Sheeted Wing Wing Span 58I/i Area 540 Sq In. Engi:e iS $39 $25 C $9 C/LI CESSNA AEROBAT 35 Enique lepreunive Sight Profile Faselage & Boiltip Sheeted Wing wing Span 52 Area iii Sq togise 35 Stunt C/LI hEIR 2 ecU Plyer/Tcaieect ciScUp Sheeted Wiogs selage Wing Span$ 1 3 II Area 200 Sq Engine 15 Cu In ntroductory prices above good until Oct 1 1989 ORDER YOURS TODAY Pleane add $4 shipping & handling 3 Send chech money order VISA & MC accepted Gice sreet addrons kiln nod phone credit cardt GEL ENTERPRISES P Q BOX 336 PB 414 5454172 WAUKESHA WISCONSIN 53187-0336 MEMBEREAA AC models real key simplic ity Simple fittings properly made will give maximum lightness strength have attractive appear ance major differences between fullscale model fittings model float fit tings down struts N drag struts spreaders normally designed flexible enough withstand bending loads whereas full-scale fittings spread ers made withstand bending manned water flight wheeled dolly picks up entire aircraft using two pad ded rails slipped under spreaders just board floats hollow extruded alu minum spreaders filled wood ex panded foam simply keep col lapsing during ground handling fullscale down struts N struts pinjointed can carry tension com pression loads Side loads carried cable cross bracing Another cable stretched across front bollards serves footbridge afloat engine off course Since full-scale installation rigid need V bottomed configuration floats comes obvious float-equipped models down struts one-piece designed carry side loads N struts carry drag loads just full-scale applications spreaders holding floats parallel resisting separation loads Youll probably struck apparent flimsiness frame attaches floats model never cease amazed much system flexes both during ground handling water thats what makes work rigid youd breaking something time made not-so-gentle landings wed rather talk about As stuff get away envy full-scale operator Using back plans sketch fuselage cross section wing lead ing edge Draw float tops below fuselage centerlines floats should positioned half length apart Determine location hardbacks floats equipped sketch Draw down strut have ready-made floats attachfitting stock begin taking measure ments point fittings provided can t bent fit drawing make new ones Dont pressured working wrong size fittings just because came kit high-wing planes rear strut usually same dimension front positioned about three-fourths wing chord back Sig Cub excep tion its rear strut slightly longer fuselage bottom isnt horizontal between front rear down struts youll have draw another fuselage cross section rear strut attaches fashion slightly different rear strut Now comes fun part bending wire making struts use 5A2-dia wire planes under 3 lb %-dia air192 Model Aviation planes up 6 lb %2-dia wire ships up 10 lb quarter-scale machine like Cub will require Y18-dia wire must heated sufficient pliability Heat ing wire takes temper out bend doesnt seem create prob lems 40-size plane requires A-dia wire single 36-in-long piece will enough both struts After cutting wire Dremel cut off wheel marking masking tape move big vise hammer Using cardboard template made draw ings start banging pulling wire about six inches bend check bend against pattern usually overbending slightly pull back eliminate residual stresses Continuing other bends similar fashion end up two custom-made down struts make N struts wire size smaller used down struts larger size isnt necessary drag loads spreaders made out same-diameter wire down struts can wrapped No 24 copper wire soldered directly across bot toms prefer put bends end just inboard flats way rear N strut can wrapped si multaneously rear spreader Another type spreader prefer arrow shaft available several diameters 32 long use 4-in-dia shafts small planes /lh-dia shafts 40 through 60-size ma chines Fiberglass shafts virtually inde structible after drilling holes fit ting struts Fabrication sequence Review accom panying drawings familiarize yourself assembly procedure using ar row shaft spreader cut shafts spreader width Airplanes 40-size range usually take 16-in spreaders both spreaders can made shaft Drill holes down strut axles MAJERIOG catalog .a -$100 wS-- ff43LU1 RIDGE nnaa Hurricane VVV 25528 MACIUNERY& TOOLS P0 Boa 536-Y Lj 304-562-3538 otter complete selBctiOn lathes mills tools Aviation Modeler THE WIREMASTER em benderbooder extra large handle bends 1/81/4 coils 5/ 32-3/16 music wire Wire creep eliminated ANTI-KREEP WIRE LOCK free catalog has hundreds new items free micro bender offer JCM COMPANY 114 Washington Tert Waukegan IL 60085 Ii L:v Thone Aecnhat -ccscceosecane & inlid Ralsa Wiogs Wnng spat: 253/h aria 300 40 In. Engine 15 Co ends Twist drill elongate holes slit end shaft cut off wheel working hole partway edge File some notches axle ar eas down struts put tufts cot ton shafts just inboard holes Slide axle end hole has slit grasping firmly bend strut inserting other axle slit hole may find necessary bevel top axle aid insertion Mix up batch JB Weld warm up joint heat gun Using piece wire small nail coax JB Weld joint JB going argue rest assured itll go Put piece masking tape over end fit re maining axles using same procedure point youll need build fitting jig absolutely essential getting whole assembly straight Follow gen eral dimensions accompanying draw ing jig can made about 20 min utes table saw Lock spreader assemblies place jig fit solder N struts Since critical part job its important take time cer tain struts fit binding before wrapping soldering use coat hanger make master hangers bend easily course can afford waste couple getting shape just right youre completely satisfied use master pattern guide cutting bending N struts spreader assemblies still locked jig buff solder areas N strut ends wrap place No 24 copper wire Youll need about 20 copper wire joint Use sol dering gun torch intense heat torch would deposit carbon joint keep solder sticking After cleaning up soldered joints strut sembly ready mounting onto floats effective mounting method Please send 1 current ha catalog hating kite accessories Walt Moucha ModelsPO Box 1 12A 906-863-1225 e Menominee Ml 49858 WOSLOS 0100057 SCALE PHOTO OSSOtOS 000 0100 SACOS PLANS 3 vIEWS PLANS ENLAHONG SASE 5n1relfle 500*0 Jim Popinos Catalog 400 60 paqeSCALE PlANS ad PHOTO SEHOICE 3209 Mdtson GeenobOO NC 27403 phone ss2925239 NO collect Bob FiorenzeI Hobby Center Inc Dealer Yellow Aircraft Complete Line Mail Order Hobby Suppliea Now eveilable Feetoover Covering Materiel Visit Showroom 135 mm Disney WorIdi OmegalCool Power Fuels Discounted____ 420 Weet SR 434-407 3274353 winter Springe FL 32705 Fax 407 327-7143 place floats board lock down position strut assembly floats Attach latter small strapsor have exposed hardbacks through prepared holes Securing entire assembly airplane simply matter screwing appropriate size landing gear straps over down struts fu selage always mount strut first back out screws fill holes cyano acrylate CyA glue resecure screws Water rudders Whether airplane steers nose wheel taildragger making water rudders easy part former case replace nose wheel stub shaft extends 1/2 below fuselage install another steering arm Run length throttle cable steering arm along nose down N strut along length float tail-dragger hook length throttle cable rudder horn attach fuselage small aluminum clips tape Bend sleeve down past rear down strut along float securing two landing gear straps An extension below air rudder makes simplest water ruddersomewhat tackylooking effective 40-size model will require 3A2-dia wire reinforced lower air rudder hinge have subrudder make double duty running shaft extension through lower bearing reduce drag loads lower hinge air rudder kickup feature shown accompa nying drawing worth effort takes make allows rudder trail water kick up obstructions ground handling Goldberg Cub float kit incorporates feature Perhaps sufficient pressure readers Gold berg company might agree package sep arately modelers using different size floats Williams Brothers makes very small kickup unit must reworked operate freely requires steering arm extension make water rudder need A-in Du-Bro Goldberg nose wheel steer ing block stub shaft collar another arm little brass stock John Sullivan sug gests following rudder sizes matched indicated airplane sizes will effective job steering model through water 125 sq-in rudder 20-size planes 225 sq 40 325 sq 60 4 sq 90 45 sq in for 12-size models Although fullscale airplanes equipped two water rudders wont see paired installa tions models However should de cide use two rudders order improve turning moment use sizes indicated above Last Hints Department waterproof ing apply finger fillet clear silicone along juncture fuselage stabi lizer little around hinges Dont use silicone around steel struts its youre using may well kiss nuts goodbye ZAP LOCI ultimate thread-locking compound \MDrks metal wood plastic combination surlces Available ri medium blue label high green label strength ZAP THE TOTAL ADHESIVE SYSTEM pacer d Calbrida iSA PRODUCTS FOR ThE DISCERNING MODELER Complete Line Exhaust Systems d Pipes Muffled Tuned P10cm Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems IinsupaSi Woi October 1989 193 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX AH Designs61 AMA Membership13 Ace Radio Control11 Aerospace Composite Prod22 Aerotrol46 Air Flair20 Airline Supply Co50 Airtronics2 174 AI-Tec & Su-Pr-Line182 Altech Marketing175 177 Coy 3 American Sailplane Des162 B&P Associates4 BLB178 Quay Barber Models165 Big Sky153 Blue Ridge Mach & Tools192 Bolar Heli Research45 Bridi Aircraft9 Bru Line Industries61 Byron Originals22 83 183 CH Electronics46 Campbell Tools Co190 Campbells Custom Kits146 Carroll Consulting157 Channel 1 Productions165 Chicago Model Hobby Show181 Cleveland Model Supply12 Composite Aircraft Eng49 Control Systems Labs51 Coverite191 Cox Hobbies148 Craftsman Models Inc180 Crenshaw Aero57 Culpepper Models Inc188 Cygnet Software20 D&R Aircraft Mfg55 DGA Designs169 Doylejet190 Du-Bro Products Inc21 Duracraft180 E&G Enterprises184 Elden-Ken Electronics180 FHS Supply Inc18-19 Farnsworth & Elroy158 Fiorenze Hobby Center192 Fitzpatrick53 Flights Fancy Aeromodel188 Flyline Models .16 Fourmost Products178 Fults Dual Struts148 Futaba Corp America98-99 G&A Products 190 G&P Sales49 GM Precision Products180 Gas Model Products182 Gator RC Products166 Carl Goldberg Models23 92 Golden Gate Hobbies163 Philip Good Engine Repair10 Gorham Model Products12 Great American Hobbies16 Great Planes84 Paul K Guillow Inc59 High Sky163 Harry Higley & Sons189 Hobby Barn150-151 Hobby Dynamics17 105 179 Hobby Horn10 Hobby Lobby International 70-173 Hobby Woods57 Bob Holman Plans182 Hotel Harrington53 Ikon Northwest Co16 Indy RC Sales Inc154-156 JCM Company193 JR Radios105 179 JTec59 Larry Jolly Model Products51 Jomar20 K&B Mfg146 K&S Engineering153 Kalt17 Kingsway Enterprises167 Kraft Midwest162 Kustom Kraftsmanship164 Lone Star Models149 MACS Products193 MGA Enterprises57 Maral Technologies33 McDaniel RC Service55 Memphis Bell Classic190 Jim Messers176 Micro Mark6-7 Midwest Products. 1 Model Products Corp166 Model Rectifier CorpCoy 2 Walt Moucha Models193 Mutchlers Hobbies160-161 Nor-Ray Products Inc55 Northeast Aerodynamics4 Northeast Screen Graphics49 Pacer Tech97 176 188 193 Parrish Aircraft178 Pattern Tek168 John Peck Leisure Prod45 Peck-Polymers59 Penn Valley Hobby Center190 Perkins Avionics 148 Pica Products Plane Video 16 Planes & Things 168 Plasti-Kote Polks Hobby 90-91 Progress Mfg Co 44 QSAA 159 RAM59 RC Buyers Guide189 RC Designs 184 RC Extras191 RC Soaring Digest164 RJL Industries22 Radio South47 Ragan/Barker Group152 Red Max Fuel18-19 Robart37 Robbe Model Sport8 Rons Model Building12 Roun Tuit61 SAC 8 SR Batteries Safety Plus 4 22 Satellite City15 Scale Glider Components158 Scale Model Research192 Scale Plans & Photo Ser193 Sceptor Models32 Sermos RC Snap Connectors10 Shamrock Competition Imports47 Sheldons Hobby Shop20 Sig Mfg Co59 106-107 195 Bob Smith Industries46 163 Stangel Enterprises192 Star Kraft170 Superior Aircraft50 Sure Flite49 Suretech61 T&D Fiberglass Spec157 Tatone Products Co57 Tidewater Hobby Enterprises53 Todays Hobbies Inc45 Top Flite Models Inc108 Tower Hobbies185-187 Tru-Turn146 VL Products 12 WE Technical Services195 WW Models169 Wandit Mfg153 Williams Brothers167 Windsor Propeller Co37 World EnginesCover 4 Zenith Aviation5 very corrosive Skid fins battens flat-bottomed floats extending steps forward couple inches will give water rudder better leverage turning Spray rails deflect water inside bottom float away prop plastic tape find discount stores Radio Shack works very well Put strip along inboard fronts trim ex tend below chines Although four-stroke engines quite well prefer two-strokes because give better power-to-weight ratio Since long low-pitch props available wood theyre kind use Though chip two average season Ive found can trim off tip rebalance prop little loss fact discovered best prop 61 long-stroke acci dent cut /2 off 14 x 5 RevUp prop following prop/two-stroke matchups work best 10 x 4 20size engines 11 x 5 cut down 10 x 5 25 engines 11 x 5 12 x 4 can find 35-to-40 engines 13 x 5 14 x 5 cut down 13 x 5 60-size 194 Model Aviation engines however use Master Airscrew 10 x 6 North Star because length constraints after following suggestions find plane still wont lift off less 100 ft first make certain youre using seaplane prop isnt problem try following 1 remove little downthrust present 2 Put small shims under front down struts raise nose slightly youll see fullsize installations quite often offset power loss added weight drag floats causes 3 Go engine size larger always good idea first start building Very light planes like Seniorita will fly beautifully K&B 20 Sportster relatively heavy planes like Aero Stars really require big ger engine Ill wager once youve brought floatplane taxied right up shore youll wonder took long Go Model Float Manufacturers Ace R/C 116W t9th St PO Box 511 Higginsville MO 64037 Balsa USA PO Box 164 Marinette WS 54143 Beckman Floats Hobby Lobby Interna tional 5615 Franklin Pike Circle Brentwood TN 37027 Bill Westphal Floats Float Place 6301 234th Place SW Mountain Lake Ter race WA 98043 Carl Goldberg Models Inc 4734 West Chicago Ave Chicago IL 60651 Gee Bee Products PO Box 18 E Longmeadow MA 01028 Great Planes Model Mfr Co PO Box 721 Urbana IL 61801 John Sullivan Model Floatplane Products 1421 Second Street Callistoga CA 94515 Lens RC Enterprises Box 214 Mon trose BC Canada VOG lPO Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 sI KHAMPION 2-STROV IEK PINTQUART GALLON 0% Nitromethane $1075 5% Nitromethane $365$525$1275 10% Nitromethane $415$550$1475 15% Nitromethane $430$635$1675 25% Nitromethane $515$795$2195 35% Nitromethane $595$925$2695 10% Nitromethane$1425 15% Nitromethane$1625 -*/rn over 20 years SIG has blending finest quality model engine fuel available using st quality ingredients instance anol use 995% pure very best grade W money can buy also use real 100% pure t Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tam 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourself Prices subject change notice See aealer first available order direct Call _____ 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO IA 50171 Etfinger * says OnlyPlane Petterove Sets give assorted designs yoc WOt have selectod best classic dodges time noose choose fsm patfens tsr pan ae importans coclusive feature Golden Age Y Scale curtisa Hawk~ ength wingspan 2266 sq iv wing area 323 engines -4 channel RIC RCOS-14 8 /e Scale cuntiss Falcon I- \IA-A-J 83 length wing spae WI- 3t66sqinwingaea4ch RIG/ Y RCQS-t3 5 116 Scale cessna ing span sq wing area 26 66 engiens 43-4 channel RIG RC6S-t 8 113 Scale Piper cub J-3 11-9 wing span ength 2856 sq wing area 26 30 cid engines annel RIG RC3S-2 8 Quarter Scale WW SE-SA go wing span sq wing area 78 22 engines gCOS7 5 SPAD c-xlll 78 Ye spas 6 5s wing nine 13 1031 engines Capable flynt-it captores iwaginanion RCO6-8 5 FOKKER DR-i TRIPLANE 72 wing span sq wing area 78 166 engines RCOS-8 82495 SOPWITH CAMEL F1 84 wingspan 2t66 sq wisgareaett lhswloRIC Py wood ft balsa conettoction use 6$ sq 601 drawings RCOStt 5 N eWPiper Tn-Pacer PA-22 t 16-318 wing span sq wing area 20 30 cid esgines 4-h channel RIG nc t2 lbs 81116 scetall length Plswoodlbalsu fulselage removeable wing poonlo steerable nose wheel designed fo easy ground handling autbeotic scale tlight portormanve $C3S36299$ aill Effinger Feaediee Meerbar AMA NFFS Halt e$ Fame Prices $or camplele plans sub assembly aed detailed parts lists Add 8250 fee Mailing Tube Send ter brechure ahead 01 thu vrowd new boohun showing new Plan Sets 101986 Send St refundable 1st orderl WE TECHNICAL SERVICES PO Box 76884-A Atlanta GA 30328 October 1989 195
Edition: Model Aviation - 1989/10
Page Numbers: 93, 94, 95, 96, 191, 192, 193, 194, 195
IN MY PREVIOUS articles off-water flying concentrated identifying ba sic requirements activity discussed flying sites retrieval systems design parameters peculiar water concluding suggestions several models con vert nicely seaplanes present article follows up dis cussion float design strut assembly hardware design installation ex plains several modifications necessary setting up seaplane Although air plane capable taking off landing water generically defined seaplane emphasis will floatplane conver sions brief nod flying boats broad terms lets identify what good seaplane ought addition being waterproof aircraft should stable dur ing normal landings takeoffs moderate wind conditions should plane little no up elevator able turn across wind burying float Flying boats often suffer re spect because tip floats both too small too high arangement al lows strong crosswinds pick up wing bury opposite float During takeoff landing runouts good seaplane design should exhibit no ten dency porpoise symptom large cut away angles and/or short heels Finally well-designed seaplane floats will properly aligned airstream minimizes frontal area impact cruising speed Floats Full-scale airplanes equipped require floats will support about twice gross weight float lengths average about 83% fuselage length positioned approximately 44% centerline centerline lengths apart steps vary 47% 53% float lengths Fuselage float lengths usually about equal singlefloat craft dimensions stack up model world Pretty well actually Model airplanes seem quite well float length 75% fuselage buoy ancy factor 80% 100% greater total model weight fliS close-up snows inree %e x s-in spruce skid fins installed step improve on-step turning flat-bottomed floats Perhaps tacky some eyes simple ex tension air rudder still makes very ef fective water rudder lower hinge air rudder must however reinforced der compensate added drag loads arrive proper float length given model youll need some draw ing plans airplane Drop line vertically down 40% mean aerody namic chord MAC point another point lying one-third prop diameter ahead prop Twice distance tween two lines becomes float length should come out fairly close 75% fuselage length Youll notice step will positioned little rear center-of-gravity some reason have compro mise move step forward centerof-gravity rather moving tips back now have enough data obtain floats will fit model havent flown off-water before yourself favor purchase first floats Once youve gained some experience have better feel sizing may want design own names addresses float man ufacturers see listings end article Sending card should get brochure evaluating literature main factors consider length corres ponding weight range engine sizes youre lucky cost finishing floats key successful seaplaning obtain ing floats right length Since floats designed considerable buoy ancy reserve theyre long enough theyll support airplane host other fac tors however such time ability cost appearance may influence choice floats youre short time Gee Bee Beck man Westphal have ready-made floats sure check weight within prescribed limits molded floats tend heavier built-up ones cov ered foam As ability can build model floats piece cakeprovided dont get carried away covering process Floats need heavy Whats heavy 31-in 44-plywood-covered foam floats including attach fittings cover ing paint weigh 15 oz carry Se-TEIN& ARM /- A-~x rxr WAT PDR U Fo AA WAThR PA/ETI 0rA 5OLP6~ T0 TO VIEW left good close-up shot kickup rudder Sea Seniorita right drawing describing parts con struction details kickup feature quite worthwile protecting rudder against submerged obstructions especially ground handling size water rudder could have little larger however will turn airplane adequately light wind conditions 94 Model Aviation Left Close-up simple effective spray rail important keeping spray away prop Its nothing piece plastic tape found Radio Shack discount store Its installed inboard front floats extend about 1/8 below chines Right Throt tle cable used controlling water rudder seen wired N strut Note float vent made Nyrod protruding hardback typicai water rudder installation tfle back ot tne TlOt singie rudder usuaiiy quite aa equate models Suggested rudder sizes various model sizes listed text 1 1 1OAT 5rkJT5I 4I4c Ji& Left Detail drawing fitting jig used assemble float struts jig important enables strut assembly built true straight Right assembled float struts mounted jig successful strut system must lightweight flexible yet strong niorita all-up weight 74 oz 40-in floats same configuration weigh 2 lb ready go carry 95-lb Super Kadet However have another set 40-in floats Kadet builtup yet still weigh 2 lb Covered foam has twin advantages easier construction being less prone leaks still weighing same built-ups What cost Balsa USA sells 30in set around $12 set source weighs 7 oz apiece com plete doped silkspan Formula U Since Theyre built-up floats must sealed carefully foam core kits will cost twice Balsa USA price build ing time cut half Finally plastic molded floats heaviest ex pensive completely ready go box water 29-in Beckmans weigh 30 oz cost $77 plus shipping Gee Bee offers much less expensive alter native about $30 33-in set Gee Bee floats dont look much like fullscale counterparts work well shouldnt discounted Speaking appearance some folks care assembled float struts Sea Senior ita shown still mounted fitting jig shadows photograph can cause little confusion wire diameters used particular size airplane struts % N struts October 1989 95 4INGJ 6 ht & Up screams low flyby model will plane almost instantly application power Its equipped 31-in floats meet 750/o-of-the fuselage-length-rule Close-up full-scale Capri 2550 floats mounted Cessna 172 showing spray deflec tor keeps water away propeller during takeoff Also note sway cables under fuselage walk-across engine off course cables stretched across float tips about others dont modelers demand scale-looking floats oth ers simply want get off water Most us lie somewhere middle sug gestion go set floats closely matches airplane question realism youll find some full-scale floats bit clunky own right Note example flat tops slab sides Capri floats Cessna 172 shown photos Yes floats V-bottomed surfaces too flat rather curved manner Edo Pee Kay have Citabria floats resem bling Edos would really dress up Like full-scale brothers model floats either slab-sided variety D______ -iEC PiZ4LLl have single-curvature tops bottom sur faces however usually flat ease construction quick planing well minimize ground handling abrasion Theres no question however V bottomed floats have good scale appearance track well takeoff addition land ings accompanied slap flat surfaces produce choice yours Covering instructions cluded floats float kit dont pro vide much information covering fol lowing supplementary material might useful Appropriate covering materials run gamut plywood glass-and-resin balsa sheet MonoKote doped silkspan Formula U Ive tried have found plas tic film lightest film does tend loosen up however step area must carefully sealed Also bot tom sheet should applied last can lapped up sides prevent water seeping under edge Doped silkspan final painting Formula U works quite well achieving al much lightness plastic film Attractive trim designs easily applied over silkspan Glass-and-resin probably dur able method has beautiful finish painted glassing try spreading thin layer epoxy surface rolling float onto glass Smooth out apply second coat epoxy dry trick start sanding before epoxy has totally hardened allowing excess roll off surface clogging paper everything finished little trim stripe can really dress up ugly float Continued page 191 FL5FLl&PORPIAM FLOAT LN&tI-i LFL simplified drawing can help determining size position angles dimensions particular installation Refer text details working out own calculations H 5TL/T HEIGHT k Fl-I F- FLOAT L-eNGTh$ 96 Model Aviation ne autnors aaughter Lee Ann noaing inc 35-lb Step-Up model equipped 30-in built-up floats covered Mono Kote floats including fittings weigh 11 oz Getting up step requires some up elevator particular airplane dual water rudder actuating system modified Super Kadet almost hidden Slimline Pius-style muffler Two water rudders necessary particular installation Completed struts mounted set Balsa USA 30-in floats glassed ready painting AMA District VI VP Burgin KY trusty Associate VP Ron Ballard Decatur IN both hand greet modelers AMA booth Jim presented South Bend RC Club AMA Award Service recognition its con tinued efforts staging Pot-O-Gold show recognition extraordinary nature its accomplishments plaque states Pot-O-Gold So much lit tle time Club President Ron Vander Molen accepted plaque behalf SBRC Club separate awards ceremony Jim Sears presented 25-Year Service Award plaque Tn-Valley RC Club Club president Bob Kyle accepted award TnValley South Bend RC groups sister clubs representing best interests mod elers both north south sides South Bend St Joseph County memberships span border area between AMA districts VI VII Throughout two-day show SBRC maintained solid frequency control coor dinated demonstration activity mishap occurred event coordinator constant contact scannerequipped control center D&J Electronics Howell MI also assisted frequency control during busy periods SBRC Club delighted receive participation four corners USA broad array dealers man ufacturers hobby-related businesses 75 alloccupying 118 booths state Washington California New York Florida represented Hazel Sig Hester promised display full-size Space Walker next year Midwest well known density its modeling popu lation considerable percentage resides within 150-mile radius South Bend demographics like SBRC Club poised greater growth its future Pot-O-Gold shows Floats-Fitti ngs/Westwood Continued page 96 Correct positioning floats model important Positioning must worked out before mounting fittings considered youll need re turn plans adding sketch made determine float length Starting airplanes prop its cor rect position take 15% prop diameter measure distance below bottom prop Draw line parallel longitudinal axis fuselage marks position top floats Seniorita using 10 x 4 10 x 5 prop top floats will 1 bottom prop An Eagle 63 turning 11 x 5 prop will require dis tance 1% Position step 40% MACor 40% chord wing rectangu lar everything done correctly youll have fairly conventional installation no surprises tips floats should about half little less prop di ameter forward prop Obviously farther forward bows better planing characteristics crucial point have enough float forward prop stopping short excessive amount Both Seniorita Light & Up have 31-in floats meet 75% rule application power no elevator control floats get plane almost im mediately task remains draw position hardbacks Most built-up floats will have internal hardbacks have type youre home free since can install spreaders anywhere please Exposed hardbacks used floats such Gee Bee require careful planning Though still allow consid erable adjustment youll need determine location exposed hardbacks beforehand draw Fittings can now considered almost designs fittings Newest Ailane Full Size Aerobatic World. .Now Available Three Size Model Kits EXTRA 230 Gtandoff Scala 33% 96 Span Wing Awe 1300 St 30% 87 Span Wing Am 117 sq 25% 75 Span Wing Aa 558 sq 229 1 $15 ship 219 I-i $l5shipl 179 hip October 1989 191 magnificently crafted tool reduces temperature drift 50 ciZ7~ THE BLACK BARON IRON Advanced hi-tech thermostat reduces temperature drift 50 Ordinary irons vary up 400 Exclusive roil bars fit fillets & under cambers Flat sole bevelled edges provides constant heat marks Coating 100% Blackstone big improvement over lessBoNus! expensive coatings slides almost noTwo stands adhesive ui1u ruy magnificent tooincluding j,j TI1ethat attaches iron Iont have CGVERE look 420 Babylon Rd Horsham PA 19044 100% Blackstone coating slides like butter Exclusive roll-bars roll fillets & undercambers responding advertisers mention read about ModelAviation G Duane Coles T- 199 1 SlOshipping R/C EXTRAS 1404 Vandenburg Cir W Sergeant Bluff IA 51054 Phone 1 712 943 4102 Cash Money Orden Ceditied Chenh VISA o \IZI1MasCad oceptdNo COD Odes lJ *PwyonM Cheohn two weeks HANGAR-7 R/C & C/L MODELS Proffesional Neans quality Results Cozoenpietre Lzit PreCut AAA Balsa & Ply PrePorned Landing Gear Spruce & Maple Bond PoIISone Rolled Plans Instructions Wheels Controls Etc Rot Included P1crcs PJnas Kitr ahove escept UCUT parts 00th handy teoplate cheet provided C P1nnas Otoly Foilsize rolled plans template sheet instractoons shlpped first class nail Free Catalog $59 $35 C $11 RIO cORSAIR 25 Distinctive lieU Wins Pavorite SemiScale Wong Span ii Wing Area iSO Sq Length 341/2 Loading II Sz/Sq Pt Weight 31/20 Engine 25 Co In. Radio iChannel Std B $25 C $7 B/C iJORtIET 074 Spurt Bipi. ~ldnl Wing Span 27 Bong Area 27i Sq In. Length 25 Loading 13 Sn Sq Pt. Weight 11/20 Engine 074 Coo Qaeen Bee Radio iChannel Micro Servos $49 B $30 C $9 B/C ALLcICAIi Ii AileronOF Spurt PlyrcI Wing Span Wing Area 375 sq on. LesEth 351/2 Weight 20 $25 C $9 Profile Fuselage & InsltUp Sheeted Wing Wing Span 58I/i Area 540 Sq In. Engi:e iS $39 $25 C $9 C/LI CESSNA AEROBAT 35 Enique lepreunive Sight Profile Faselage & Boiltip Sheeted Wing wing Span 52 Area iii Sq togise 35 Stunt C/LI hEIR 2 ecU Plyer/Tcaieect ciScUp Sheeted Wiogs selage Wing Span$ 1 3 II Area 200 Sq Engine 15 Cu In ntroductory prices above good until Oct 1 1989 ORDER YOURS TODAY Pleane add $4 shipping & handling 3 Send chech money order VISA & MC accepted Gice sreet addrons kiln nod phone credit cardt GEL ENTERPRISES P Q BOX 336 PB 414 5454172 WAUKESHA WISCONSIN 53187-0336 MEMBEREAA AC models real key simplic ity Simple fittings properly made will give maximum lightness strength have attractive appear ance major differences between fullscale model fittings model float fit tings down struts N drag struts spreaders normally designed flexible enough withstand bending loads whereas full-scale fittings spread ers made withstand bending manned water flight wheeled dolly picks up entire aircraft using two pad ded rails slipped under spreaders just board floats hollow extruded alu minum spreaders filled wood ex panded foam simply keep col lapsing during ground handling fullscale down struts N struts pinjointed can carry tension com pression loads Side loads carried cable cross bracing Another cable stretched across front bollards serves footbridge afloat engine off course Since full-scale installation rigid need V bottomed configuration floats comes obvious float-equipped models down struts one-piece designed carry side loads N struts carry drag loads just full-scale applications spreaders holding floats parallel resisting separation loads Youll probably struck apparent flimsiness frame attaches floats model never cease amazed much system flexes both during ground handling water thats what makes work rigid youd breaking something time made not-so-gentle landings wed rather talk about As stuff get away envy full-scale operator Using back plans sketch fuselage cross section wing lead ing edge Draw float tops below fuselage centerlines floats should positioned half length apart Determine location hardbacks floats equipped sketch Draw down strut have ready-made floats attachfitting stock begin taking measure ments point fittings provided can t bent fit drawing make new ones Dont pressured working wrong size fittings just because came kit high-wing planes rear strut usually same dimension front positioned about three-fourths wing chord back Sig Cub excep tion its rear strut slightly longer fuselage bottom isnt horizontal between front rear down struts youll have draw another fuselage cross section rear strut attaches fashion slightly different rear strut Now comes fun part bending wire making struts use 5A2-dia wire planes under 3 lb %-dia air192 Model Aviation planes up 6 lb %2-dia wire ships up 10 lb quarter-scale machine like Cub will require Y18-dia wire must heated sufficient pliability Heat ing wire takes temper out bend doesnt seem create prob lems 40-size plane requires A-dia wire single 36-in-long piece will enough both struts After cutting wire Dremel cut off wheel marking masking tape move big vise hammer Using cardboard template made draw ings start banging pulling wire about six inches bend check bend against pattern usually overbending slightly pull back eliminate residual stresses Continuing other bends similar fashion end up two custom-made down struts make N struts wire size smaller used down struts larger size isnt necessary drag loads spreaders made out same-diameter wire down struts can wrapped No 24 copper wire soldered directly across bot toms prefer put bends end just inboard flats way rear N strut can wrapped si multaneously rear spreader Another type spreader prefer arrow shaft available several diameters 32 long use 4-in-dia shafts small planes /lh-dia shafts 40 through 60-size ma chines Fiberglass shafts virtually inde structible after drilling holes fit ting struts Fabrication sequence Review accom panying drawings familiarize yourself assembly procedure using ar row shaft spreader cut shafts spreader width Airplanes 40-size range usually take 16-in spreaders both spreaders can made shaft Drill holes down strut axles MAJERIOG catalog .a -$100 wS-- ff43LU1 RIDGE nnaa Hurricane VVV 25528 MACIUNERY& TOOLS P0 Boa 536-Y Lj 304-562-3538 otter complete selBctiOn lathes mills tools Aviation Modeler THE WIREMASTER em benderbooder extra large handle bends 1/81/4 coils 5/ 32-3/16 music wire Wire creep eliminated ANTI-KREEP WIRE LOCK free catalog has hundreds new items free micro bender offer JCM COMPANY 114 Washington Tert Waukegan IL 60085 Ii L:v Thone Aecnhat -ccscceosecane & inlid Ralsa Wiogs Wnng spat: 253/h aria 300 40 In. Engine 15 Co ends Twist drill elongate holes slit end shaft cut off wheel working hole partway edge File some notches axle ar eas down struts put tufts cot ton shafts just inboard holes Slide axle end hole has slit grasping firmly bend strut inserting other axle slit hole may find necessary bevel top axle aid insertion Mix up batch JB Weld warm up joint heat gun Using piece wire small nail coax JB Weld joint JB going argue rest assured itll go Put piece masking tape over end fit re maining axles using same procedure point youll need build fitting jig absolutely essential getting whole assembly straight Follow gen eral dimensions accompanying draw ing jig can made about 20 min utes table saw Lock spreader assemblies place jig fit solder N struts Since critical part job its important take time cer tain struts fit binding before wrapping soldering use coat hanger make master hangers bend easily course can afford waste couple getting shape just right youre completely satisfied use master pattern guide cutting bending N struts spreader assemblies still locked jig buff solder areas N strut ends wrap place No 24 copper wire Youll need about 20 copper wire joint Use sol dering gun torch intense heat torch would deposit carbon joint keep solder sticking After cleaning up soldered joints strut sembly ready mounting onto floats effective mounting method Please send 1 current ha catalog hating kite accessories Walt Moucha ModelsPO Box 1 12A 906-863-1225 e Menominee Ml 49858 WOSLOS 0100057 SCALE PHOTO OSSOtOS 000 0100 SACOS PLANS 3 vIEWS PLANS ENLAHONG SASE 5n1relfle 500*0 Jim Popinos Catalog 400 60 paqeSCALE PlANS ad PHOTO SEHOICE 3209 Mdtson GeenobOO NC 27403 phone ss2925239 NO collect Bob FiorenzeI Hobby Center Inc Dealer Yellow Aircraft Complete Line Mail Order Hobby Suppliea Now eveilable Feetoover Covering Materiel Visit Showroom 135 mm Disney WorIdi OmegalCool Power Fuels Discounted____ 420 Weet SR 434-407 3274353 winter Springe FL 32705 Fax 407 327-7143 place floats board lock down position strut assembly floats Attach latter small strapsor have exposed hardbacks through prepared holes Securing entire assembly airplane simply matter screwing appropriate size landing gear straps over down struts fu selage always mount strut first back out screws fill holes cyano acrylate CyA glue resecure screws Water rudders Whether airplane steers nose wheel taildragger making water rudders easy part former case replace nose wheel stub shaft extends 1/2 below fuselage install another steering arm Run length throttle cable steering arm along nose down N strut along length float tail-dragger hook length throttle cable rudder horn attach fuselage small aluminum clips tape Bend sleeve down past rear down strut along float securing two landing gear straps An extension below air rudder makes simplest water ruddersomewhat tackylooking effective 40-size model will require 3A2-dia wire reinforced lower air rudder hinge have subrudder make double duty running shaft extension through lower bearing reduce drag loads lower hinge air rudder kickup feature shown accompa nying drawing worth effort takes make allows rudder trail water kick up obstructions ground handling Goldberg Cub float kit incorporates feature Perhaps sufficient pressure readers Gold berg company might agree package sep arately modelers using different size floats Williams Brothers makes very small kickup unit must reworked operate freely requires steering arm extension make water rudder need A-in Du-Bro Goldberg nose wheel steer ing block stub shaft collar another arm little brass stock John Sullivan sug gests following rudder sizes matched indicated airplane sizes will effective job steering model through water 125 sq-in rudder 20-size planes 225 sq 40 325 sq 60 4 sq 90 45 sq in for 12-size models Although fullscale airplanes equipped two water rudders wont see paired installa tions models However should de cide use two rudders order improve turning moment use sizes indicated above Last Hints Department waterproof ing apply finger fillet clear silicone along juncture fuselage stabi lizer little around hinges Dont use silicone around steel struts its youre using may well kiss nuts goodbye ZAP LOCI ultimate thread-locking compound \MDrks metal wood plastic combination surlces Available ri medium blue label high green label strength ZAP THE TOTAL ADHESIVE SYSTEM pacer d Calbrida iSA PRODUCTS FOR ThE DISCERNING MODELER Complete Line Exhaust Systems d Pipes Muffled Tuned P10cm Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems IinsupaSi Woi October 1989 193 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX AH Designs61 AMA Membership13 Ace Radio Control11 Aerospace Composite Prod22 Aerotrol46 Air Flair20 Airline Supply Co50 Airtronics2 174 AI-Tec & Su-Pr-Line182 Altech Marketing175 177 Coy 3 American Sailplane Des162 B&P Associates4 BLB178 Quay Barber Models165 Big Sky153 Blue Ridge Mach & Tools192 Bolar Heli Research45 Bridi Aircraft9 Bru Line Industries61 Byron Originals22 83 183 CH Electronics46 Campbell Tools Co190 Campbells Custom Kits146 Carroll Consulting157 Channel 1 Productions165 Chicago Model Hobby Show181 Cleveland Model Supply12 Composite Aircraft Eng49 Control Systems Labs51 Coverite191 Cox Hobbies148 Craftsman Models Inc180 Crenshaw Aero57 Culpepper Models Inc188 Cygnet Software20 D&R Aircraft Mfg55 DGA Designs169 Doylejet190 Du-Bro Products Inc21 Duracraft180 E&G Enterprises184 Elden-Ken Electronics180 FHS Supply Inc18-19 Farnsworth & Elroy158 Fiorenze Hobby Center192 Fitzpatrick53 Flights Fancy Aeromodel188 Flyline Models .16 Fourmost Products178 Fults Dual Struts148 Futaba Corp America98-99 G&A Products 190 G&P Sales49 GM Precision Products180 Gas Model Products182 Gator RC Products166 Carl Goldberg Models23 92 Golden Gate Hobbies163 Philip Good Engine Repair10 Gorham Model Products12 Great American Hobbies16 Great Planes84 Paul K Guillow Inc59 High Sky163 Harry Higley & Sons189 Hobby Barn150-151 Hobby Dynamics17 105 179 Hobby Horn10 Hobby Lobby International 70-173 Hobby Woods57 Bob Holman Plans182 Hotel Harrington53 Ikon Northwest Co16 Indy RC Sales Inc154-156 JCM Company193 JR Radios105 179 JTec59 Larry Jolly Model Products51 Jomar20 K&B Mfg146 K&S Engineering153 Kalt17 Kingsway Enterprises167 Kraft Midwest162 Kustom Kraftsmanship164 Lone Star Models149 MACS Products193 MGA Enterprises57 Maral Technologies33 McDaniel RC Service55 Memphis Bell Classic190 Jim Messers176 Micro Mark6-7 Midwest Products. 1 Model Products Corp166 Model Rectifier CorpCoy 2 Walt Moucha Models193 Mutchlers Hobbies160-161 Nor-Ray Products Inc55 Northeast Aerodynamics4 Northeast Screen Graphics49 Pacer Tech97 176 188 193 Parrish Aircraft178 Pattern Tek168 John Peck Leisure Prod45 Peck-Polymers59 Penn Valley Hobby Center190 Perkins Avionics 148 Pica Products Plane Video 16 Planes & Things 168 Plasti-Kote Polks Hobby 90-91 Progress Mfg Co 44 QSAA 159 RAM59 RC Buyers Guide189 RC Designs 184 RC Extras191 RC Soaring Digest164 RJL Industries22 Radio South47 Ragan/Barker Group152 Red Max Fuel18-19 Robart37 Robbe Model Sport8 Rons Model Building12 Roun Tuit61 SAC 8 SR Batteries Safety Plus 4 22 Satellite City15 Scale Glider Components158 Scale Model Research192 Scale Plans & Photo Ser193 Sceptor Models32 Sermos RC Snap Connectors10 Shamrock Competition Imports47 Sheldons Hobby Shop20 Sig Mfg Co59 106-107 195 Bob Smith Industries46 163 Stangel Enterprises192 Star Kraft170 Superior Aircraft50 Sure Flite49 Suretech61 T&D Fiberglass Spec157 Tatone Products Co57 Tidewater Hobby Enterprises53 Todays Hobbies Inc45 Top Flite Models Inc108 Tower Hobbies185-187 Tru-Turn146 VL Products 12 WE Technical Services195 WW Models169 Wandit Mfg153 Williams Brothers167 Windsor Propeller Co37 World EnginesCover 4 Zenith Aviation5 very corrosive Skid fins battens flat-bottomed floats extending steps forward couple inches will give water rudder better leverage turning Spray rails deflect water inside bottom float away prop plastic tape find discount stores Radio Shack works very well Put strip along inboard fronts trim ex tend below chines Although four-stroke engines quite well prefer two-strokes because give better power-to-weight ratio Since long low-pitch props available wood theyre kind use Though chip two average season Ive found can trim off tip rebalance prop little loss fact discovered best prop 61 long-stroke acci dent cut /2 off 14 x 5 RevUp prop following prop/two-stroke matchups work best 10 x 4 20size engines 11 x 5 cut down 10 x 5 25 engines 11 x 5 12 x 4 can find 35-to-40 engines 13 x 5 14 x 5 cut down 13 x 5 60-size 194 Model Aviation engines however use Master Airscrew 10 x 6 North Star because length constraints after following suggestions find plane still wont lift off less 100 ft first make certain youre using seaplane prop isnt problem try following 1 remove little downthrust present 2 Put small shims under front down struts raise nose slightly youll see fullsize installations quite often offset power loss added weight drag floats causes 3 Go engine size larger always good idea first start building Very light planes like Seniorita will fly beautifully K&B 20 Sportster relatively heavy planes like Aero Stars really require big ger engine Ill wager once youve brought floatplane taxied right up shore youll wonder took long Go Model Float Manufacturers Ace R/C 116W t9th St PO Box 511 Higginsville MO 64037 Balsa USA PO Box 164 Marinette WS 54143 Beckman Floats Hobby Lobby Interna tional 5615 Franklin Pike Circle Brentwood TN 37027 Bill Westphal Floats Float Place 6301 234th Place SW Mountain Lake Ter race WA 98043 Carl Goldberg Models Inc 4734 West Chicago Ave Chicago IL 60651 Gee Bee Products PO Box 18 E Longmeadow MA 01028 Great Planes Model Mfr Co PO Box 721 Urbana IL 61801 John Sullivan Model Floatplane Products 1421 Second Street Callistoga CA 94515 Lens RC Enterprises Box 214 Mon trose BC Canada VOG lPO Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 sI KHAMPION 2-STROV IEK PINTQUART GALLON 0% Nitromethane $1075 5% Nitromethane $365$525$1275 10% Nitromethane $415$550$1475 15% Nitromethane $430$635$1675 25% Nitromethane $515$795$2195 35% Nitromethane $595$925$2695 10% Nitromethane$1425 15% Nitromethane$1625 -*/rn over 20 years SIG has blending finest quality model engine fuel available using st quality ingredients instance anol use 995% pure very best grade W money can buy also use real 100% pure t Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tam 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourself Prices subject change notice See aealer first available order direct Call _____ 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO IA 50171 Etfinger * says OnlyPlane Petterove Sets give assorted designs yoc WOt have selectod best classic dodges time noose choose fsm patfens tsr pan ae importans coclusive feature Golden Age Y Scale curtisa Hawk~ ength wingspan 2266 sq iv wing area 323 engines -4 channel RIC RCOS-14 8 /e Scale cuntiss Falcon I- \IA-A-J 83 length wing spae WI- 3t66sqinwingaea4ch RIG/ Y RCQS-t3 5 116 Scale cessna ing span sq wing area 26 66 engiens 43-4 channel RIG RC6S-t 8 113 Scale Piper cub J-3 11-9 wing span ength 2856 sq wing area 26 30 cid engines annel RIG RC3S-2 8 Quarter Scale WW SE-SA go wing span sq wing area 78 22 engines gCOS7 5 SPAD c-xlll 78 Ye spas 6 5s wing nine 13 1031 engines Capable flynt-it captores iwaginanion RCO6-8 5 FOKKER DR-i TRIPLANE 72 wing span sq wing area 78 166 engines RCOS-8 82495 SOPWITH CAMEL F1 84 wingspan 2t66 sq wisgareaett lhswloRIC Py wood ft balsa conettoction use 6$ sq 601 drawings RCOStt 5 N eWPiper Tn-Pacer PA-22 t 16-318 wing span sq wing area 20 30 cid esgines 4-h channel RIG nc t2 lbs 81116 scetall length Plswoodlbalsu fulselage removeable wing poonlo steerable nose wheel designed fo easy ground handling autbeotic scale tlight portormanve $C3S36299$ aill Effinger Feaediee Meerbar AMA NFFS Halt e$ Fame Prices $or camplele plans sub assembly aed detailed parts lists Add 8250 fee Mailing Tube Send ter brechure ahead 01 thu vrowd new boohun showing new Plan Sets 101986 Send St refundable 1st orderl WE TECHNICAL SERVICES PO Box 76884-A Atlanta GA 30328 October 1989 195
Edition: Model Aviation - 1989/10
Page Numbers: 93, 94, 95, 96, 191, 192, 193, 194, 195
IN MY PREVIOUS articles off-water flying concentrated identifying ba sic requirements activity discussed flying sites retrieval systems design parameters peculiar water concluding suggestions several models con vert nicely seaplanes present article follows up dis cussion float design strut assembly hardware design installation ex plains several modifications necessary setting up seaplane Although air plane capable taking off landing water generically defined seaplane emphasis will floatplane conver sions brief nod flying boats broad terms lets identify what good seaplane ought addition being waterproof aircraft should stable dur ing normal landings takeoffs moderate wind conditions should plane little no up elevator able turn across wind burying float Flying boats often suffer re spect because tip floats both too small too high arangement al lows strong crosswinds pick up wing bury opposite float During takeoff landing runouts good seaplane design should exhibit no ten dency porpoise symptom large cut away angles and/or short heels Finally well-designed seaplane floats will properly aligned airstream minimizes frontal area impact cruising speed Floats Full-scale airplanes equipped require floats will support about twice gross weight float lengths average about 83% fuselage length positioned approximately 44% centerline centerline lengths apart steps vary 47% 53% float lengths Fuselage float lengths usually about equal singlefloat craft dimensions stack up model world Pretty well actually Model airplanes seem quite well float length 75% fuselage buoy ancy factor 80% 100% greater total model weight fliS close-up snows inree %e x s-in spruce skid fins installed step improve on-step turning flat-bottomed floats Perhaps tacky some eyes simple ex tension air rudder still makes very ef fective water rudder lower hinge air rudder must however reinforced der compensate added drag loads arrive proper float length given model youll need some draw ing plans airplane Drop line vertically down 40% mean aerody namic chord MAC point another point lying one-third prop diameter ahead prop Twice distance tween two lines becomes float length should come out fairly close 75% fuselage length Youll notice step will positioned little rear center-of-gravity some reason have compro mise move step forward centerof-gravity rather moving tips back now have enough data obtain floats will fit model havent flown off-water before yourself favor purchase first floats Once youve gained some experience have better feel sizing may want design own names addresses float man ufacturers see listings end article Sending card should get brochure evaluating literature main factors consider length corres ponding weight range engine sizes youre lucky cost finishing floats key successful seaplaning obtain ing floats right length Since floats designed considerable buoy ancy reserve theyre long enough theyll support airplane host other fac tors however such time ability cost appearance may influence choice floats youre short time Gee Bee Beck man Westphal have ready-made floats sure check weight within prescribed limits molded floats tend heavier built-up ones cov ered foam As ability can build model floats piece cakeprovided dont get carried away covering process Floats need heavy Whats heavy 31-in 44-plywood-covered foam floats including attach fittings cover ing paint weigh 15 oz carry Se-TEIN& ARM /- A-~x rxr WAT PDR U Fo AA WAThR PA/ETI 0rA 5OLP6~ T0 TO VIEW left good close-up shot kickup rudder Sea Seniorita right drawing describing parts con struction details kickup feature quite worthwile protecting rudder against submerged obstructions especially ground handling size water rudder could have little larger however will turn airplane adequately light wind conditions 94 Model Aviation Left Close-up simple effective spray rail important keeping spray away prop Its nothing piece plastic tape found Radio Shack discount store Its installed inboard front floats extend about 1/8 below chines Right Throt tle cable used controlling water rudder seen wired N strut Note float vent made Nyrod protruding hardback typicai water rudder installation tfle back ot tne TlOt singie rudder usuaiiy quite aa equate models Suggested rudder sizes various model sizes listed text 1 1 1OAT 5rkJT5I 4I4c Ji& Left Detail drawing fitting jig used assemble float struts jig important enables strut assembly built true straight Right assembled float struts mounted jig successful strut system must lightweight flexible yet strong niorita all-up weight 74 oz 40-in floats same configuration weigh 2 lb ready go carry 95-lb Super Kadet However have another set 40-in floats Kadet builtup yet still weigh 2 lb Covered foam has twin advantages easier construction being less prone leaks still weighing same built-ups What cost Balsa USA sells 30in set around $12 set source weighs 7 oz apiece com plete doped silkspan Formula U Since Theyre built-up floats must sealed carefully foam core kits will cost twice Balsa USA price build ing time cut half Finally plastic molded floats heaviest ex pensive completely ready go box water 29-in Beckmans weigh 30 oz cost $77 plus shipping Gee Bee offers much less expensive alter native about $30 33-in set Gee Bee floats dont look much like fullscale counterparts work well shouldnt discounted Speaking appearance some folks care assembled float struts Sea Senior ita shown still mounted fitting jig shadows photograph can cause little confusion wire diameters used particular size airplane struts % N struts October 1989 95 4INGJ 6 ht & Up screams low flyby model will plane almost instantly application power Its equipped 31-in floats meet 750/o-of-the fuselage-length-rule Close-up full-scale Capri 2550 floats mounted Cessna 172 showing spray deflec tor keeps water away propeller during takeoff Also note sway cables under fuselage walk-across engine off course cables stretched across float tips about others dont modelers demand scale-looking floats oth ers simply want get off water Most us lie somewhere middle sug gestion go set floats closely matches airplane question realism youll find some full-scale floats bit clunky own right Note example flat tops slab sides Capri floats Cessna 172 shown photos Yes floats V-bottomed surfaces too flat rather curved manner Edo Pee Kay have Citabria floats resem bling Edos would really dress up Like full-scale brothers model floats either slab-sided variety D______ -iEC PiZ4LLl have single-curvature tops bottom sur faces however usually flat ease construction quick planing well minimize ground handling abrasion Theres no question however V bottomed floats have good scale appearance track well takeoff addition land ings accompanied slap flat surfaces produce choice yours Covering instructions cluded floats float kit dont pro vide much information covering fol lowing supplementary material might useful Appropriate covering materials run gamut plywood glass-and-resin balsa sheet MonoKote doped silkspan Formula U Ive tried have found plas tic film lightest film does tend loosen up however step area must carefully sealed Also bot tom sheet should applied last can lapped up sides prevent water seeping under edge Doped silkspan final painting Formula U works quite well achieving al much lightness plastic film Attractive trim designs easily applied over silkspan Glass-and-resin probably dur able method has beautiful finish painted glassing try spreading thin layer epoxy surface rolling float onto glass Smooth out apply second coat epoxy dry trick start sanding before epoxy has totally hardened allowing excess roll off surface clogging paper everything finished little trim stripe can really dress up ugly float Continued page 191 FL5FLl&PORPIAM FLOAT LN&tI-i LFL simplified drawing can help determining size position angles dimensions particular installation Refer text details working out own calculations H 5TL/T HEIGHT k Fl-I F- FLOAT L-eNGTh$ 96 Model Aviation ne autnors aaughter Lee Ann noaing inc 35-lb Step-Up model equipped 30-in built-up floats covered Mono Kote floats including fittings weigh 11 oz Getting up step requires some up elevator particular airplane dual water rudder actuating system modified Super Kadet almost hidden Slimline Pius-style muffler Two water rudders necessary particular installation Completed struts mounted set Balsa USA 30-in floats glassed ready painting AMA District VI VP Burgin KY trusty Associate VP Ron Ballard Decatur IN both hand greet modelers AMA booth Jim presented South Bend RC Club AMA Award Service recognition its con tinued efforts staging Pot-O-Gold show recognition extraordinary nature its accomplishments plaque states Pot-O-Gold So much lit tle time Club President Ron Vander Molen accepted plaque behalf SBRC Club separate awards ceremony Jim Sears presented 25-Year Service Award plaque Tn-Valley RC Club Club president Bob Kyle accepted award TnValley South Bend RC groups sister clubs representing best interests mod elers both north south sides South Bend St Joseph County memberships span border area between AMA districts VI VII Throughout two-day show SBRC maintained solid frequency control coor dinated demonstration activity mishap occurred event coordinator constant contact scannerequipped control center D&J Electronics Howell MI also assisted frequency control during busy periods SBRC Club delighted receive participation four corners USA broad array dealers man ufacturers hobby-related businesses 75 alloccupying 118 booths state Washington California New York Florida represented Hazel Sig Hester promised display full-size Space Walker next year Midwest well known density its modeling popu lation considerable percentage resides within 150-mile radius South Bend demographics like SBRC Club poised greater growth its future Pot-O-Gold shows Floats-Fitti ngs/Westwood Continued page 96 Correct positioning floats model important Positioning must worked out before mounting fittings considered youll need re turn plans adding sketch made determine float length Starting airplanes prop its cor rect position take 15% prop diameter measure distance below bottom prop Draw line parallel longitudinal axis fuselage marks position top floats Seniorita using 10 x 4 10 x 5 prop top floats will 1 bottom prop An Eagle 63 turning 11 x 5 prop will require dis tance 1% Position step 40% MACor 40% chord wing rectangu lar everything done correctly youll have fairly conventional installation no surprises tips floats should about half little less prop di ameter forward prop Obviously farther forward bows better planing characteristics crucial point have enough float forward prop stopping short excessive amount Both Seniorita Light & Up have 31-in floats meet 75% rule application power no elevator control floats get plane almost im mediately task remains draw position hardbacks Most built-up floats will have internal hardbacks have type youre home free since can install spreaders anywhere please Exposed hardbacks used floats such Gee Bee require careful planning Though still allow consid erable adjustment youll need determine location exposed hardbacks beforehand draw Fittings can now considered almost designs fittings Newest Ailane Full Size Aerobatic World. .Now Available Three Size Model Kits EXTRA 230 Gtandoff Scala 33% 96 Span Wing Awe 1300 St 30% 87 Span Wing Am 117 sq 25% 75 Span Wing Aa 558 sq 229 1 $15 ship 219 I-i $l5shipl 179 hip October 1989 191 magnificently crafted tool reduces temperature drift 50 ciZ7~ THE BLACK BARON IRON Advanced hi-tech thermostat reduces temperature drift 50 Ordinary irons vary up 400 Exclusive roil bars fit fillets & under cambers Flat sole bevelled edges provides constant heat marks Coating 100% Blackstone big improvement over lessBoNus! expensive coatings slides almost noTwo stands adhesive ui1u ruy magnificent tooincluding j,j TI1ethat attaches iron Iont have CGVERE look 420 Babylon Rd Horsham PA 19044 100% Blackstone coating slides like butter Exclusive roll-bars roll fillets & undercambers responding advertisers mention read about ModelAviation G Duane Coles T- 199 1 SlOshipping R/C EXTRAS 1404 Vandenburg Cir W Sergeant Bluff IA 51054 Phone 1 712 943 4102 Cash Money Orden Ceditied Chenh VISA o \IZI1MasCad oceptdNo COD Odes lJ *PwyonM Cheohn two weeks HANGAR-7 R/C & C/L MODELS Proffesional Neans quality Results Cozoenpietre Lzit PreCut AAA Balsa & Ply PrePorned Landing Gear Spruce & Maple Bond PoIISone Rolled Plans Instructions Wheels Controls Etc Rot Included P1crcs PJnas Kitr ahove escept UCUT parts 00th handy teoplate cheet provided C P1nnas Otoly Foilsize rolled plans template sheet instractoons shlpped first class nail Free Catalog $59 $35 C $11 RIO cORSAIR 25 Distinctive lieU Wins Pavorite SemiScale Wong Span ii Wing Area iSO Sq Length 341/2 Loading II Sz/Sq Pt Weight 31/20 Engine 25 Co In. Radio iChannel Std B $25 C $7 B/C iJORtIET 074 Spurt Bipi. ~ldnl Wing Span 27 Bong Area 27i Sq In. Length 25 Loading 13 Sn Sq Pt. Weight 11/20 Engine 074 Coo Qaeen Bee Radio iChannel Micro Servos $49 B $30 C $9 B/C ALLcICAIi Ii AileronOF Spurt PlyrcI Wing Span Wing Area 375 sq on. LesEth 351/2 Weight 20 $25 C $9 Profile Fuselage & InsltUp Sheeted Wing Wing Span 58I/i Area 540 Sq In. Engi:e iS $39 $25 C $9 C/LI CESSNA AEROBAT 35 Enique lepreunive Sight Profile Faselage & Boiltip Sheeted Wing wing Span 52 Area iii Sq togise 35 Stunt C/LI hEIR 2 ecU Plyer/Tcaieect ciScUp Sheeted Wiogs selage Wing Span$ 1 3 II Area 200 Sq Engine 15 Cu In ntroductory prices above good until Oct 1 1989 ORDER YOURS TODAY Pleane add $4 shipping & handling 3 Send chech money order VISA & MC accepted Gice sreet addrons kiln nod phone credit cardt GEL ENTERPRISES P Q BOX 336 PB 414 5454172 WAUKESHA WISCONSIN 53187-0336 MEMBEREAA AC models real key simplic ity Simple fittings properly made will give maximum lightness strength have attractive appear ance major differences between fullscale model fittings model float fit tings down struts N drag struts spreaders normally designed flexible enough withstand bending loads whereas full-scale fittings spread ers made withstand bending manned water flight wheeled dolly picks up entire aircraft using two pad ded rails slipped under spreaders just board floats hollow extruded alu minum spreaders filled wood ex panded foam simply keep col lapsing during ground handling fullscale down struts N struts pinjointed can carry tension com pression loads Side loads carried cable cross bracing Another cable stretched across front bollards serves footbridge afloat engine off course Since full-scale installation rigid need V bottomed configuration floats comes obvious float-equipped models down struts one-piece designed carry side loads N struts carry drag loads just full-scale applications spreaders holding floats parallel resisting separation loads Youll probably struck apparent flimsiness frame attaches floats model never cease amazed much system flexes both during ground handling water thats what makes work rigid youd breaking something time made not-so-gentle landings wed rather talk about As stuff get away envy full-scale operator Using back plans sketch fuselage cross section wing lead ing edge Draw float tops below fuselage centerlines floats should positioned half length apart Determine location hardbacks floats equipped sketch Draw down strut have ready-made floats attachfitting stock begin taking measure ments point fittings provided can t bent fit drawing make new ones Dont pressured working wrong size fittings just because came kit high-wing planes rear strut usually same dimension front positioned about three-fourths wing chord back Sig Cub excep tion its rear strut slightly longer fuselage bottom isnt horizontal between front rear down struts youll have draw another fuselage cross section rear strut attaches fashion slightly different rear strut Now comes fun part bending wire making struts use 5A2-dia wire planes under 3 lb %-dia air192 Model Aviation planes up 6 lb %2-dia wire ships up 10 lb quarter-scale machine like Cub will require Y18-dia wire must heated sufficient pliability Heat ing wire takes temper out bend doesnt seem create prob lems 40-size plane requires A-dia wire single 36-in-long piece will enough both struts After cutting wire Dremel cut off wheel marking masking tape move big vise hammer Using cardboard template made draw ings start banging pulling wire about six inches bend check bend against pattern usually overbending slightly pull back eliminate residual stresses Continuing other bends similar fashion end up two custom-made down struts make N struts wire size smaller used down struts larger size isnt necessary drag loads spreaders made out same-diameter wire down struts can wrapped No 24 copper wire soldered directly across bot toms prefer put bends end just inboard flats way rear N strut can wrapped si multaneously rear spreader Another type spreader prefer arrow shaft available several diameters 32 long use 4-in-dia shafts small planes /lh-dia shafts 40 through 60-size ma chines Fiberglass shafts virtually inde structible after drilling holes fit ting struts Fabrication sequence Review accom panying drawings familiarize yourself assembly procedure using ar row shaft spreader cut shafts spreader width Airplanes 40-size range usually take 16-in spreaders both spreaders can made shaft Drill holes down strut axles MAJERIOG catalog .a -$100 wS-- ff43LU1 RIDGE nnaa Hurricane VVV 25528 MACIUNERY& TOOLS P0 Boa 536-Y Lj 304-562-3538 otter complete selBctiOn lathes mills tools Aviation Modeler THE WIREMASTER em benderbooder extra large handle bends 1/81/4 coils 5/ 32-3/16 music wire Wire creep eliminated ANTI-KREEP WIRE LOCK free catalog has hundreds new items free micro bender offer JCM COMPANY 114 Washington Tert Waukegan IL 60085 Ii L:v Thone Aecnhat -ccscceosecane & inlid Ralsa Wiogs Wnng spat: 253/h aria 300 40 In. Engine 15 Co ends Twist drill elongate holes slit end shaft cut off wheel working hole partway edge File some notches axle ar eas down struts put tufts cot ton shafts just inboard holes Slide axle end hole has slit grasping firmly bend strut inserting other axle slit hole may find necessary bevel top axle aid insertion Mix up batch JB Weld warm up joint heat gun Using piece wire small nail coax JB Weld joint JB going argue rest assured itll go Put piece masking tape over end fit re maining axles using same procedure point youll need build fitting jig absolutely essential getting whole assembly straight Follow gen eral dimensions accompanying draw ing jig can made about 20 min utes table saw Lock spreader assemblies place jig fit solder N struts Since critical part job its important take time cer tain struts fit binding before wrapping soldering use coat hanger make master hangers bend easily course can afford waste couple getting shape just right youre completely satisfied use master pattern guide cutting bending N struts spreader assemblies still locked jig buff solder areas N strut ends wrap place No 24 copper wire Youll need about 20 copper wire joint Use sol dering gun torch intense heat torch would deposit carbon joint keep solder sticking After cleaning up soldered joints strut sembly ready mounting onto floats effective mounting method Please send 1 current ha catalog hating kite accessories Walt Moucha ModelsPO Box 1 12A 906-863-1225 e Menominee Ml 49858 WOSLOS 0100057 SCALE PHOTO OSSOtOS 000 0100 SACOS PLANS 3 vIEWS PLANS ENLAHONG SASE 5n1relfle 500*0 Jim Popinos Catalog 400 60 paqeSCALE PlANS ad PHOTO SEHOICE 3209 Mdtson GeenobOO NC 27403 phone ss2925239 NO collect Bob FiorenzeI Hobby Center Inc Dealer Yellow Aircraft Complete Line Mail Order Hobby Suppliea Now eveilable Feetoover Covering Materiel Visit Showroom 135 mm Disney WorIdi OmegalCool Power Fuels Discounted____ 420 Weet SR 434-407 3274353 winter Springe FL 32705 Fax 407 327-7143 place floats board lock down position strut assembly floats Attach latter small strapsor have exposed hardbacks through prepared holes Securing entire assembly airplane simply matter screwing appropriate size landing gear straps over down struts fu selage always mount strut first back out screws fill holes cyano acrylate CyA glue resecure screws Water rudders Whether airplane steers nose wheel taildragger making water rudders easy part former case replace nose wheel stub shaft extends 1/2 below fuselage install another steering arm Run length throttle cable steering arm along nose down N strut along length float tail-dragger hook length throttle cable rudder horn attach fuselage small aluminum clips tape Bend sleeve down past rear down strut along float securing two landing gear straps An extension below air rudder makes simplest water ruddersomewhat tackylooking effective 40-size model will require 3A2-dia wire reinforced lower air rudder hinge have subrudder make double duty running shaft extension through lower bearing reduce drag loads lower hinge air rudder kickup feature shown accompa nying drawing worth effort takes make allows rudder trail water kick up obstructions ground handling Goldberg Cub float kit incorporates feature Perhaps sufficient pressure readers Gold berg company might agree package sep arately modelers using different size floats Williams Brothers makes very small kickup unit must reworked operate freely requires steering arm extension make water rudder need A-in Du-Bro Goldberg nose wheel steer ing block stub shaft collar another arm little brass stock John Sullivan sug gests following rudder sizes matched indicated airplane sizes will effective job steering model through water 125 sq-in rudder 20-size planes 225 sq 40 325 sq 60 4 sq 90 45 sq in for 12-size models Although fullscale airplanes equipped two water rudders wont see paired installa tions models However should de cide use two rudders order improve turning moment use sizes indicated above Last Hints Department waterproof ing apply finger fillet clear silicone along juncture fuselage stabi lizer little around hinges Dont use silicone around steel struts its youre using may well kiss nuts goodbye ZAP LOCI ultimate thread-locking compound \MDrks metal wood plastic combination surlces Available ri medium blue label high green label strength ZAP THE TOTAL ADHESIVE SYSTEM pacer d Calbrida iSA PRODUCTS FOR ThE DISCERNING MODELER Complete Line Exhaust Systems d Pipes Muffled Tuned P10cm Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems IinsupaSi Woi October 1989 193 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX AH Designs61 AMA Membership13 Ace Radio Control11 Aerospace Composite Prod22 Aerotrol46 Air Flair20 Airline Supply Co50 Airtronics2 174 AI-Tec & Su-Pr-Line182 Altech Marketing175 177 Coy 3 American Sailplane Des162 B&P Associates4 BLB178 Quay Barber Models165 Big Sky153 Blue Ridge Mach & Tools192 Bolar Heli Research45 Bridi Aircraft9 Bru Line Industries61 Byron Originals22 83 183 CH Electronics46 Campbell Tools Co190 Campbells Custom Kits146 Carroll Consulting157 Channel 1 Productions165 Chicago Model Hobby Show181 Cleveland Model Supply12 Composite Aircraft Eng49 Control Systems Labs51 Coverite191 Cox Hobbies148 Craftsman Models Inc180 Crenshaw Aero57 Culpepper Models Inc188 Cygnet Software20 D&R Aircraft Mfg55 DGA Designs169 Doylejet190 Du-Bro Products Inc21 Duracraft180 E&G Enterprises184 Elden-Ken Electronics180 FHS Supply Inc18-19 Farnsworth & Elroy158 Fiorenze Hobby Center192 Fitzpatrick53 Flights Fancy Aeromodel188 Flyline Models .16 Fourmost Products178 Fults Dual Struts148 Futaba Corp America98-99 G&A Products 190 G&P Sales49 GM Precision Products180 Gas Model Products182 Gator RC Products166 Carl Goldberg Models23 92 Golden Gate Hobbies163 Philip Good Engine Repair10 Gorham Model Products12 Great American Hobbies16 Great Planes84 Paul K Guillow Inc59 High Sky163 Harry Higley & Sons189 Hobby Barn150-151 Hobby Dynamics17 105 179 Hobby Horn10 Hobby Lobby International 70-173 Hobby Woods57 Bob Holman Plans182 Hotel Harrington53 Ikon Northwest Co16 Indy RC Sales Inc154-156 JCM Company193 JR Radios105 179 JTec59 Larry Jolly Model Products51 Jomar20 K&B Mfg146 K&S Engineering153 Kalt17 Kingsway Enterprises167 Kraft Midwest162 Kustom Kraftsmanship164 Lone Star Models149 MACS Products193 MGA Enterprises57 Maral Technologies33 McDaniel RC Service55 Memphis Bell Classic190 Jim Messers176 Micro Mark6-7 Midwest Products. 1 Model Products Corp166 Model Rectifier CorpCoy 2 Walt Moucha Models193 Mutchlers Hobbies160-161 Nor-Ray Products Inc55 Northeast Aerodynamics4 Northeast Screen Graphics49 Pacer Tech97 176 188 193 Parrish Aircraft178 Pattern Tek168 John Peck Leisure Prod45 Peck-Polymers59 Penn Valley Hobby Center190 Perkins Avionics 148 Pica Products Plane Video 16 Planes & Things 168 Plasti-Kote Polks Hobby 90-91 Progress Mfg Co 44 QSAA 159 RAM59 RC Buyers Guide189 RC Designs 184 RC Extras191 RC Soaring Digest164 RJL Industries22 Radio South47 Ragan/Barker Group152 Red Max Fuel18-19 Robart37 Robbe Model Sport8 Rons Model Building12 Roun Tuit61 SAC 8 SR Batteries Safety Plus 4 22 Satellite City15 Scale Glider Components158 Scale Model Research192 Scale Plans & Photo Ser193 Sceptor Models32 Sermos RC Snap Connectors10 Shamrock Competition Imports47 Sheldons Hobby Shop20 Sig Mfg Co59 106-107 195 Bob Smith Industries46 163 Stangel Enterprises192 Star Kraft170 Superior Aircraft50 Sure Flite49 Suretech61 T&D Fiberglass Spec157 Tatone Products Co57 Tidewater Hobby Enterprises53 Todays Hobbies Inc45 Top Flite Models Inc108 Tower Hobbies185-187 Tru-Turn146 VL Products 12 WE Technical Services195 WW Models169 Wandit Mfg153 Williams Brothers167 Windsor Propeller Co37 World EnginesCover 4 Zenith Aviation5 very corrosive Skid fins battens flat-bottomed floats extending steps forward couple inches will give water rudder better leverage turning Spray rails deflect water inside bottom float away prop plastic tape find discount stores Radio Shack works very well Put strip along inboard fronts trim ex tend below chines Although four-stroke engines quite well prefer two-strokes because give better power-to-weight ratio Since long low-pitch props available wood theyre kind use Though chip two average season Ive found can trim off tip rebalance prop little loss fact discovered best prop 61 long-stroke acci dent cut /2 off 14 x 5 RevUp prop following prop/two-stroke matchups work best 10 x 4 20size engines 11 x 5 cut down 10 x 5 25 engines 11 x 5 12 x 4 can find 35-to-40 engines 13 x 5 14 x 5 cut down 13 x 5 60-size 194 Model Aviation engines however use Master Airscrew 10 x 6 North Star because length constraints after following suggestions find plane still wont lift off less 100 ft first make certain youre using seaplane prop isnt problem try following 1 remove little downthrust present 2 Put small shims under front down struts raise nose slightly youll see fullsize installations quite often offset power loss added weight drag floats causes 3 Go engine size larger always good idea first start building Very light planes like Seniorita will fly beautifully K&B 20 Sportster relatively heavy planes like Aero Stars really require big ger engine Ill wager once youve brought floatplane taxied right up shore youll wonder took long Go Model Float Manufacturers Ace R/C 116W t9th St PO Box 511 Higginsville MO 64037 Balsa USA PO Box 164 Marinette WS 54143 Beckman Floats Hobby Lobby Interna tional 5615 Franklin Pike Circle Brentwood TN 37027 Bill Westphal Floats Float Place 6301 234th Place SW Mountain Lake Ter race WA 98043 Carl Goldberg Models Inc 4734 West Chicago Ave Chicago IL 60651 Gee Bee Products PO Box 18 E Longmeadow MA 01028 Great Planes Model Mfr Co PO Box 721 Urbana IL 61801 John Sullivan Model Floatplane Products 1421 Second Street Callistoga CA 94515 Lens RC Enterprises Box 214 Mon trose BC Canada VOG lPO Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 sI KHAMPION 2-STROV IEK PINTQUART GALLON 0% Nitromethane $1075 5% Nitromethane $365$525$1275 10% Nitromethane $415$550$1475 15% Nitromethane $430$635$1675 25% Nitromethane $515$795$2195 35% Nitromethane $595$925$2695 10% Nitromethane$1425 15% Nitromethane$1625 -*/rn over 20 years SIG has blending finest quality model engine fuel available using st quality ingredients instance anol use 995% pure very best grade W money can buy also use real 100% pure t Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tam 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourself Prices subject change notice See aealer first available order direct Call _____ 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO IA 50171 Etfinger * says OnlyPlane Petterove Sets give assorted designs yoc WOt have selectod best classic dodges time noose choose fsm patfens tsr pan ae importans coclusive feature Golden Age Y Scale curtisa Hawk~ ength wingspan 2266 sq iv wing area 323 engines -4 channel RIC RCOS-14 8 /e Scale cuntiss Falcon I- \IA-A-J 83 length wing spae WI- 3t66sqinwingaea4ch RIG/ Y RCQS-t3 5 116 Scale cessna ing span sq wing area 26 66 engiens 43-4 channel RIG RC6S-t 8 113 Scale Piper cub J-3 11-9 wing span ength 2856 sq wing area 26 30 cid engines annel RIG RC3S-2 8 Quarter Scale WW SE-SA go wing span sq wing area 78 22 engines gCOS7 5 SPAD c-xlll 78 Ye spas 6 5s wing nine 13 1031 engines Capable flynt-it captores iwaginanion RCO6-8 5 FOKKER DR-i TRIPLANE 72 wing span sq wing area 78 166 engines RCOS-8 82495 SOPWITH CAMEL F1 84 wingspan 2t66 sq wisgareaett lhswloRIC Py wood ft balsa conettoction use 6$ sq 601 drawings RCOStt 5 N eWPiper Tn-Pacer PA-22 t 16-318 wing span sq wing area 20 30 cid esgines 4-h channel RIG nc t2 lbs 81116 scetall length Plswoodlbalsu fulselage removeable wing poonlo steerable nose wheel designed fo easy ground handling autbeotic scale tlight portormanve $C3S36299$ aill Effinger Feaediee Meerbar AMA NFFS Halt e$ Fame Prices $or camplele plans sub assembly aed detailed parts lists Add 8250 fee Mailing Tube Send ter brechure ahead 01 thu vrowd new boohun showing new Plan Sets 101986 Send St refundable 1st orderl WE TECHNICAL SERVICES PO Box 76884-A Atlanta GA 30328 October 1989 195
Edition: Model Aviation - 1989/10
Page Numbers: 93, 94, 95, 96, 191, 192, 193, 194, 195
IN MY PREVIOUS articles off-water flying concentrated identifying ba sic requirements activity discussed flying sites retrieval systems design parameters peculiar water concluding suggestions several models con vert nicely seaplanes present article follows up dis cussion float design strut assembly hardware design installation ex plains several modifications necessary setting up seaplane Although air plane capable taking off landing water generically defined seaplane emphasis will floatplane conver sions brief nod flying boats broad terms lets identify what good seaplane ought addition being waterproof aircraft should stable dur ing normal landings takeoffs moderate wind conditions should plane little no up elevator able turn across wind burying float Flying boats often suffer re spect because tip floats both too small too high arangement al lows strong crosswinds pick up wing bury opposite float During takeoff landing runouts good seaplane design should exhibit no ten dency porpoise symptom large cut away angles and/or short heels Finally well-designed seaplane floats will properly aligned airstream minimizes frontal area impact cruising speed Floats Full-scale airplanes equipped require floats will support about twice gross weight float lengths average about 83% fuselage length positioned approximately 44% centerline centerline lengths apart steps vary 47% 53% float lengths Fuselage float lengths usually about equal singlefloat craft dimensions stack up model world Pretty well actually Model airplanes seem quite well float length 75% fuselage buoy ancy factor 80% 100% greater total model weight fliS close-up snows inree %e x s-in spruce skid fins installed step improve on-step turning flat-bottomed floats Perhaps tacky some eyes simple ex tension air rudder still makes very ef fective water rudder lower hinge air rudder must however reinforced der compensate added drag loads arrive proper float length given model youll need some draw ing plans airplane Drop line vertically down 40% mean aerody namic chord MAC point another point lying one-third prop diameter ahead prop Twice distance tween two lines becomes float length should come out fairly close 75% fuselage length Youll notice step will positioned little rear center-of-gravity some reason have compro mise move step forward centerof-gravity rather moving tips back now have enough data obtain floats will fit model havent flown off-water before yourself favor purchase first floats Once youve gained some experience have better feel sizing may want design own names addresses float man ufacturers see listings end article Sending card should get brochure evaluating literature main factors consider length corres ponding weight range engine sizes youre lucky cost finishing floats key successful seaplaning obtain ing floats right length Since floats designed considerable buoy ancy reserve theyre long enough theyll support airplane host other fac tors however such time ability cost appearance may influence choice floats youre short time Gee Bee Beck man Westphal have ready-made floats sure check weight within prescribed limits molded floats tend heavier built-up ones cov ered foam As ability can build model floats piece cakeprovided dont get carried away covering process Floats need heavy Whats heavy 31-in 44-plywood-covered foam floats including attach fittings cover ing paint weigh 15 oz carry Se-TEIN& ARM /- A-~x rxr WAT PDR U Fo AA WAThR PA/ETI 0rA 5OLP6~ T0 TO VIEW left good close-up shot kickup rudder Sea Seniorita right drawing describing parts con struction details kickup feature quite worthwile protecting rudder against submerged obstructions especially ground handling size water rudder could have little larger however will turn airplane adequately light wind conditions 94 Model Aviation Left Close-up simple effective spray rail important keeping spray away prop Its nothing piece plastic tape found Radio Shack discount store Its installed inboard front floats extend about 1/8 below chines Right Throt tle cable used controlling water rudder seen wired N strut Note float vent made Nyrod protruding hardback typicai water rudder installation tfle back ot tne TlOt singie rudder usuaiiy quite aa equate models Suggested rudder sizes various model sizes listed text 1 1 1OAT 5rkJT5I 4I4c Ji& Left Detail drawing fitting jig used assemble float struts jig important enables strut assembly built true straight Right assembled float struts mounted jig successful strut system must lightweight flexible yet strong niorita all-up weight 74 oz 40-in floats same configuration weigh 2 lb ready go carry 95-lb Super Kadet However have another set 40-in floats Kadet builtup yet still weigh 2 lb Covered foam has twin advantages easier construction being less prone leaks still weighing same built-ups What cost Balsa USA sells 30in set around $12 set source weighs 7 oz apiece com plete doped silkspan Formula U Since Theyre built-up floats must sealed carefully foam core kits will cost twice Balsa USA price build ing time cut half Finally plastic molded floats heaviest ex pensive completely ready go box water 29-in Beckmans weigh 30 oz cost $77 plus shipping Gee Bee offers much less expensive alter native about $30 33-in set Gee Bee floats dont look much like fullscale counterparts work well shouldnt discounted Speaking appearance some folks care assembled float struts Sea Senior ita shown still mounted fitting jig shadows photograph can cause little confusion wire diameters used particular size airplane struts % N struts October 1989 95 4INGJ 6 ht & Up screams low flyby model will plane almost instantly application power Its equipped 31-in floats meet 750/o-of-the fuselage-length-rule Close-up full-scale Capri 2550 floats mounted Cessna 172 showing spray deflec tor keeps water away propeller during takeoff Also note sway cables under fuselage walk-across engine off course cables stretched across float tips about others dont modelers demand scale-looking floats oth ers simply want get off water Most us lie somewhere middle sug gestion go set floats closely matches airplane question realism youll find some full-scale floats bit clunky own right Note example flat tops slab sides Capri floats Cessna 172 shown photos Yes floats V-bottomed surfaces too flat rather curved manner Edo Pee Kay have Citabria floats resem bling Edos would really dress up Like full-scale brothers model floats either slab-sided variety D______ -iEC PiZ4LLl have single-curvature tops bottom sur faces however usually flat ease construction quick planing well minimize ground handling abrasion Theres no question however V bottomed floats have good scale appearance track well takeoff addition land ings accompanied slap flat surfaces produce choice yours Covering instructions cluded floats float kit dont pro vide much information covering fol lowing supplementary material might useful Appropriate covering materials run gamut plywood glass-and-resin balsa sheet MonoKote doped silkspan Formula U Ive tried have found plas tic film lightest film does tend loosen up however step area must carefully sealed Also bot tom sheet should applied last can lapped up sides prevent water seeping under edge Doped silkspan final painting Formula U works quite well achieving al much lightness plastic film Attractive trim designs easily applied over silkspan Glass-and-resin probably dur able method has beautiful finish painted glassing try spreading thin layer epoxy surface rolling float onto glass Smooth out apply second coat epoxy dry trick start sanding before epoxy has totally hardened allowing excess roll off surface clogging paper everything finished little trim stripe can really dress up ugly float Continued page 191 FL5FLl&PORPIAM FLOAT LN&tI-i LFL simplified drawing can help determining size position angles dimensions particular installation Refer text details working out own calculations H 5TL/T HEIGHT k Fl-I F- FLOAT L-eNGTh$ 96 Model Aviation ne autnors aaughter Lee Ann noaing inc 35-lb Step-Up model equipped 30-in built-up floats covered Mono Kote floats including fittings weigh 11 oz Getting up step requires some up elevator particular airplane dual water rudder actuating system modified Super Kadet almost hidden Slimline Pius-style muffler Two water rudders necessary particular installation Completed struts mounted set Balsa USA 30-in floats glassed ready painting AMA District VI VP Burgin KY trusty Associate VP Ron Ballard Decatur IN both hand greet modelers AMA booth Jim presented South Bend RC Club AMA Award Service recognition its con tinued efforts staging Pot-O-Gold show recognition extraordinary nature its accomplishments plaque states Pot-O-Gold So much lit tle time Club President Ron Vander Molen accepted plaque behalf SBRC Club separate awards ceremony Jim Sears presented 25-Year Service Award plaque Tn-Valley RC Club Club president Bob Kyle accepted award TnValley South Bend RC groups sister clubs representing best interests mod elers both north south sides South Bend St Joseph County memberships span border area between AMA districts VI VII Throughout two-day show SBRC maintained solid frequency control coor dinated demonstration activity mishap occurred event coordinator constant contact scannerequipped control center D&J Electronics Howell MI also assisted frequency control during busy periods SBRC Club delighted receive participation four corners USA broad array dealers man ufacturers hobby-related businesses 75 alloccupying 118 booths state Washington California New York Florida represented Hazel Sig Hester promised display full-size Space Walker next year Midwest well known density its modeling popu lation considerable percentage resides within 150-mile radius South Bend demographics like SBRC Club poised greater growth its future Pot-O-Gold shows Floats-Fitti ngs/Westwood Continued page 96 Correct positioning floats model important Positioning must worked out before mounting fittings considered youll need re turn plans adding sketch made determine float length Starting airplanes prop its cor rect position take 15% prop diameter measure distance below bottom prop Draw line parallel longitudinal axis fuselage marks position top floats Seniorita using 10 x 4 10 x 5 prop top floats will 1 bottom prop An Eagle 63 turning 11 x 5 prop will require dis tance 1% Position step 40% MACor 40% chord wing rectangu lar everything done correctly youll have fairly conventional installation no surprises tips floats should about half little less prop di ameter forward prop Obviously farther forward bows better planing characteristics crucial point have enough float forward prop stopping short excessive amount Both Seniorita Light & Up have 31-in floats meet 75% rule application power no elevator control floats get plane almost im mediately task remains draw position hardbacks Most built-up floats will have internal hardbacks have type youre home free since can install spreaders anywhere please Exposed hardbacks used floats such Gee Bee require careful planning Though still allow consid erable adjustment youll need determine location exposed hardbacks beforehand draw Fittings can now considered almost designs fittings Newest Ailane Full Size Aerobatic World. .Now Available Three Size Model Kits EXTRA 230 Gtandoff Scala 33% 96 Span Wing Awe 1300 St 30% 87 Span Wing Am 117 sq 25% 75 Span Wing Aa 558 sq 229 1 $15 ship 219 I-i $l5shipl 179 hip October 1989 191 magnificently crafted tool reduces temperature drift 50 ciZ7~ THE BLACK BARON IRON Advanced hi-tech thermostat reduces temperature drift 50 Ordinary irons vary up 400 Exclusive roil bars fit fillets & under cambers Flat sole bevelled edges provides constant heat marks Coating 100% Blackstone big improvement over lessBoNus! expensive coatings slides almost noTwo stands adhesive ui1u ruy magnificent tooincluding j,j TI1ethat attaches iron Iont have CGVERE look 420 Babylon Rd Horsham PA 19044 100% Blackstone coating slides like butter Exclusive roll-bars roll fillets & undercambers responding advertisers mention read about ModelAviation G Duane Coles T- 199 1 SlOshipping R/C EXTRAS 1404 Vandenburg Cir W Sergeant Bluff IA 51054 Phone 1 712 943 4102 Cash Money Orden Ceditied Chenh VISA o \IZI1MasCad oceptdNo COD Odes lJ *PwyonM Cheohn two weeks HANGAR-7 R/C & C/L MODELS Proffesional Neans quality Results Cozoenpietre Lzit PreCut AAA Balsa & Ply PrePorned Landing Gear Spruce & Maple Bond PoIISone Rolled Plans Instructions Wheels Controls Etc Rot Included P1crcs PJnas Kitr ahove escept UCUT parts 00th handy teoplate cheet provided C P1nnas Otoly Foilsize rolled plans template sheet instractoons shlpped first class nail Free Catalog $59 $35 C $11 RIO cORSAIR 25 Distinctive lieU Wins Pavorite SemiScale Wong Span ii Wing Area iSO Sq Length 341/2 Loading II Sz/Sq Pt Weight 31/20 Engine 25 Co In. Radio iChannel Std B $25 C $7 B/C iJORtIET 074 Spurt Bipi. ~ldnl Wing Span 27 Bong Area 27i Sq In. Length 25 Loading 13 Sn Sq Pt. Weight 11/20 Engine 074 Coo Qaeen Bee Radio iChannel Micro Servos $49 B $30 C $9 B/C ALLcICAIi Ii AileronOF Spurt PlyrcI Wing Span Wing Area 375 sq on. LesEth 351/2 Weight 20 $25 C $9 Profile Fuselage & InsltUp Sheeted Wing Wing Span 58I/i Area 540 Sq In. Engi:e iS $39 $25 C $9 C/LI CESSNA AEROBAT 35 Enique lepreunive Sight Profile Faselage & Boiltip Sheeted Wing wing Span 52 Area iii Sq togise 35 Stunt C/LI hEIR 2 ecU Plyer/Tcaieect ciScUp Sheeted Wiogs selage Wing Span$ 1 3 II Area 200 Sq Engine 15 Cu In ntroductory prices above good until Oct 1 1989 ORDER YOURS TODAY Pleane add $4 shipping & handling 3 Send chech money order VISA & MC accepted Gice sreet addrons kiln nod phone credit cardt GEL ENTERPRISES P Q BOX 336 PB 414 5454172 WAUKESHA WISCONSIN 53187-0336 MEMBEREAA AC models real key simplic ity Simple fittings properly made will give maximum lightness strength have attractive appear ance major differences between fullscale model fittings model float fit tings down struts N drag struts spreaders normally designed flexible enough withstand bending loads whereas full-scale fittings spread ers made withstand bending manned water flight wheeled dolly picks up entire aircraft using two pad ded rails slipped under spreaders just board floats hollow extruded alu minum spreaders filled wood ex panded foam simply keep col lapsing during ground handling fullscale down struts N struts pinjointed can carry tension com pression loads Side loads carried cable cross bracing Another cable stretched across front bollards serves footbridge afloat engine off course Since full-scale installation rigid need V bottomed configuration floats comes obvious float-equipped models down struts one-piece designed carry side loads N struts carry drag loads just full-scale applications spreaders holding floats parallel resisting separation loads Youll probably struck apparent flimsiness frame attaches floats model never cease amazed much system flexes both during ground handling water thats what makes work rigid youd breaking something time made not-so-gentle landings wed rather talk about As stuff get away envy full-scale operator Using back plans sketch fuselage cross section wing lead ing edge Draw float tops below fuselage centerlines floats should positioned half length apart Determine location hardbacks floats equipped sketch Draw down strut have ready-made floats attachfitting stock begin taking measure ments point fittings provided can t bent fit drawing make new ones Dont pressured working wrong size fittings just because came kit high-wing planes rear strut usually same dimension front positioned about three-fourths wing chord back Sig Cub excep tion its rear strut slightly longer fuselage bottom isnt horizontal between front rear down struts youll have draw another fuselage cross section rear strut attaches fashion slightly different rear strut Now comes fun part bending wire making struts use 5A2-dia wire planes under 3 lb %-dia air192 Model Aviation planes up 6 lb %2-dia wire ships up 10 lb quarter-scale machine like Cub will require Y18-dia wire must heated sufficient pliability Heat ing wire takes temper out bend doesnt seem create prob lems 40-size plane requires A-dia wire single 36-in-long piece will enough both struts After cutting wire Dremel cut off wheel marking masking tape move big vise hammer Using cardboard template made draw ings start banging pulling wire about six inches bend check bend against pattern usually overbending slightly pull back eliminate residual stresses Continuing other bends similar fashion end up two custom-made down struts make N struts wire size smaller used down struts larger size isnt necessary drag loads spreaders made out same-diameter wire down struts can wrapped No 24 copper wire soldered directly across bot toms prefer put bends end just inboard flats way rear N strut can wrapped si multaneously rear spreader Another type spreader prefer arrow shaft available several diameters 32 long use 4-in-dia shafts small planes /lh-dia shafts 40 through 60-size ma chines Fiberglass shafts virtually inde structible after drilling holes fit ting struts Fabrication sequence Review accom panying drawings familiarize yourself assembly procedure using ar row shaft spreader cut shafts spreader width Airplanes 40-size range usually take 16-in spreaders both spreaders can made shaft Drill holes down strut axles MAJERIOG catalog .a -$100 wS-- ff43LU1 RIDGE nnaa Hurricane VVV 25528 MACIUNERY& TOOLS P0 Boa 536-Y Lj 304-562-3538 otter complete selBctiOn lathes mills tools Aviation Modeler THE WIREMASTER em benderbooder extra large handle bends 1/81/4 coils 5/ 32-3/16 music wire Wire creep eliminated ANTI-KREEP WIRE LOCK free catalog has hundreds new items free micro bender offer JCM COMPANY 114 Washington Tert Waukegan IL 60085 Ii L:v Thone Aecnhat -ccscceosecane & inlid Ralsa Wiogs Wnng spat: 253/h aria 300 40 In. Engine 15 Co ends Twist drill elongate holes slit end shaft cut off wheel working hole partway edge File some notches axle ar eas down struts put tufts cot ton shafts just inboard holes Slide axle end hole has slit grasping firmly bend strut inserting other axle slit hole may find necessary bevel top axle aid insertion Mix up batch JB Weld warm up joint heat gun Using piece wire small nail coax JB Weld joint JB going argue rest assured itll go Put piece masking tape over end fit re maining axles using same procedure point youll need build fitting jig absolutely essential getting whole assembly straight Follow gen eral dimensions accompanying draw ing jig can made about 20 min utes table saw Lock spreader assemblies place jig fit solder N struts Since critical part job its important take time cer tain struts fit binding before wrapping soldering use coat hanger make master hangers bend easily course can afford waste couple getting shape just right youre completely satisfied use master pattern guide cutting bending N struts spreader assemblies still locked jig buff solder areas N strut ends wrap place No 24 copper wire Youll need about 20 copper wire joint Use sol dering gun torch intense heat torch would deposit carbon joint keep solder sticking After cleaning up soldered joints strut sembly ready mounting onto floats effective mounting method Please send 1 current ha catalog hating kite accessories Walt Moucha ModelsPO Box 1 12A 906-863-1225 e Menominee Ml 49858 WOSLOS 0100057 SCALE PHOTO OSSOtOS 000 0100 SACOS PLANS 3 vIEWS PLANS ENLAHONG SASE 5n1relfle 500*0 Jim Popinos Catalog 400 60 paqeSCALE PlANS ad PHOTO SEHOICE 3209 Mdtson GeenobOO NC 27403 phone ss2925239 NO collect Bob FiorenzeI Hobby Center Inc Dealer Yellow Aircraft Complete Line Mail Order Hobby Suppliea Now eveilable Feetoover Covering Materiel Visit Showroom 135 mm Disney WorIdi OmegalCool Power Fuels Discounted____ 420 Weet SR 434-407 3274353 winter Springe FL 32705 Fax 407 327-7143 place floats board lock down position strut assembly floats Attach latter small strapsor have exposed hardbacks through prepared holes Securing entire assembly airplane simply matter screwing appropriate size landing gear straps over down struts fu selage always mount strut first back out screws fill holes cyano acrylate CyA glue resecure screws Water rudders Whether airplane steers nose wheel taildragger making water rudders easy part former case replace nose wheel stub shaft extends 1/2 below fuselage install another steering arm Run length throttle cable steering arm along nose down N strut along length float tail-dragger hook length throttle cable rudder horn attach fuselage small aluminum clips tape Bend sleeve down past rear down strut along float securing two landing gear straps An extension below air rudder makes simplest water ruddersomewhat tackylooking effective 40-size model will require 3A2-dia wire reinforced lower air rudder hinge have subrudder make double duty running shaft extension through lower bearing reduce drag loads lower hinge air rudder kickup feature shown accompa nying drawing worth effort takes make allows rudder trail water kick up obstructions ground handling Goldberg Cub float kit incorporates feature Perhaps sufficient pressure readers Gold berg company might agree package sep arately modelers using different size floats Williams Brothers makes very small kickup unit must reworked operate freely requires steering arm extension make water rudder need A-in Du-Bro Goldberg nose wheel steer ing block stub shaft collar another arm little brass stock John Sullivan sug gests following rudder sizes matched indicated airplane sizes will effective job steering model through water 125 sq-in rudder 20-size planes 225 sq 40 325 sq 60 4 sq 90 45 sq in for 12-size models Although fullscale airplanes equipped two water rudders wont see paired installa tions models However should de cide use two rudders order improve turning moment use sizes indicated above Last Hints Department waterproof ing apply finger fillet clear silicone along juncture fuselage stabi lizer little around hinges Dont use silicone around steel struts its youre using may well kiss nuts goodbye ZAP LOCI ultimate thread-locking compound \MDrks metal wood plastic combination surlces Available ri medium blue label high green label strength ZAP THE TOTAL ADHESIVE SYSTEM pacer d Calbrida iSA PRODUCTS FOR ThE DISCERNING MODELER Complete Line Exhaust Systems d Pipes Muffled Tuned P10cm Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems IinsupaSi Woi October 1989 193 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX AH Designs61 AMA Membership13 Ace Radio Control11 Aerospace Composite Prod22 Aerotrol46 Air Flair20 Airline Supply Co50 Airtronics2 174 AI-Tec & Su-Pr-Line182 Altech Marketing175 177 Coy 3 American Sailplane Des162 B&P Associates4 BLB178 Quay Barber Models165 Big Sky153 Blue Ridge Mach & Tools192 Bolar Heli Research45 Bridi Aircraft9 Bru Line Industries61 Byron Originals22 83 183 CH Electronics46 Campbell Tools Co190 Campbells Custom Kits146 Carroll Consulting157 Channel 1 Productions165 Chicago Model Hobby Show181 Cleveland Model Supply12 Composite Aircraft Eng49 Control Systems Labs51 Coverite191 Cox Hobbies148 Craftsman Models Inc180 Crenshaw Aero57 Culpepper Models Inc188 Cygnet Software20 D&R Aircraft Mfg55 DGA Designs169 Doylejet190 Du-Bro Products Inc21 Duracraft180 E&G Enterprises184 Elden-Ken Electronics180 FHS Supply Inc18-19 Farnsworth & Elroy158 Fiorenze Hobby Center192 Fitzpatrick53 Flights Fancy Aeromodel188 Flyline Models .16 Fourmost Products178 Fults Dual Struts148 Futaba Corp America98-99 G&A Products 190 G&P Sales49 GM Precision Products180 Gas Model Products182 Gator RC Products166 Carl Goldberg Models23 92 Golden Gate Hobbies163 Philip Good Engine Repair10 Gorham Model Products12 Great American Hobbies16 Great Planes84 Paul K Guillow Inc59 High Sky163 Harry Higley & Sons189 Hobby Barn150-151 Hobby Dynamics17 105 179 Hobby Horn10 Hobby Lobby International 70-173 Hobby Woods57 Bob Holman Plans182 Hotel Harrington53 Ikon Northwest Co16 Indy RC Sales Inc154-156 JCM Company193 JR Radios105 179 JTec59 Larry Jolly Model Products51 Jomar20 K&B Mfg146 K&S Engineering153 Kalt17 Kingsway Enterprises167 Kraft Midwest162 Kustom Kraftsmanship164 Lone Star Models149 MACS Products193 MGA Enterprises57 Maral Technologies33 McDaniel RC Service55 Memphis Bell Classic190 Jim Messers176 Micro Mark6-7 Midwest Products. 1 Model Products Corp166 Model Rectifier CorpCoy 2 Walt Moucha Models193 Mutchlers Hobbies160-161 Nor-Ray Products Inc55 Northeast Aerodynamics4 Northeast Screen Graphics49 Pacer Tech97 176 188 193 Parrish Aircraft178 Pattern Tek168 John Peck Leisure Prod45 Peck-Polymers59 Penn Valley Hobby Center190 Perkins Avionics 148 Pica Products Plane Video 16 Planes & Things 168 Plasti-Kote Polks Hobby 90-91 Progress Mfg Co 44 QSAA 159 RAM59 RC Buyers Guide189 RC Designs 184 RC Extras191 RC Soaring Digest164 RJL Industries22 Radio South47 Ragan/Barker Group152 Red Max Fuel18-19 Robart37 Robbe Model Sport8 Rons Model Building12 Roun Tuit61 SAC 8 SR Batteries Safety Plus 4 22 Satellite City15 Scale Glider Components158 Scale Model Research192 Scale Plans & Photo Ser193 Sceptor Models32 Sermos RC Snap Connectors10 Shamrock Competition Imports47 Sheldons Hobby Shop20 Sig Mfg Co59 106-107 195 Bob Smith Industries46 163 Stangel Enterprises192 Star Kraft170 Superior Aircraft50 Sure Flite49 Suretech61 T&D Fiberglass Spec157 Tatone Products Co57 Tidewater Hobby Enterprises53 Todays Hobbies Inc45 Top Flite Models Inc108 Tower Hobbies185-187 Tru-Turn146 VL Products 12 WE Technical Services195 WW Models169 Wandit Mfg153 Williams Brothers167 Windsor Propeller Co37 World EnginesCover 4 Zenith Aviation5 very corrosive Skid fins battens flat-bottomed floats extending steps forward couple inches will give water rudder better leverage turning Spray rails deflect water inside bottom float away prop plastic tape find discount stores Radio Shack works very well Put strip along inboard fronts trim ex tend below chines Although four-stroke engines quite well prefer two-strokes because give better power-to-weight ratio Since long low-pitch props available wood theyre kind use Though chip two average season Ive found can trim off tip rebalance prop little loss fact discovered best prop 61 long-stroke acci dent cut /2 off 14 x 5 RevUp prop following prop/two-stroke matchups work best 10 x 4 20size engines 11 x 5 cut down 10 x 5 25 engines 11 x 5 12 x 4 can find 35-to-40 engines 13 x 5 14 x 5 cut down 13 x 5 60-size 194 Model Aviation engines however use Master Airscrew 10 x 6 North Star because length constraints after following suggestions find plane still wont lift off less 100 ft first make certain youre using seaplane prop isnt problem try following 1 remove little downthrust present 2 Put small shims under front down struts raise nose slightly youll see fullsize installations quite often offset power loss added weight drag floats causes 3 Go engine size larger always good idea first start building Very light planes like Seniorita will fly beautifully K&B 20 Sportster relatively heavy planes like Aero Stars really require big ger engine Ill wager once youve brought floatplane taxied right up shore youll wonder took long Go Model Float Manufacturers Ace R/C 116W t9th St PO Box 511 Higginsville MO 64037 Balsa USA PO Box 164 Marinette WS 54143 Beckman Floats Hobby Lobby Interna tional 5615 Franklin Pike Circle Brentwood TN 37027 Bill Westphal Floats Float Place 6301 234th Place SW Mountain Lake Ter race WA 98043 Carl Goldberg Models Inc 4734 West Chicago Ave Chicago IL 60651 Gee Bee Products PO Box 18 E Longmeadow MA 01028 Great Planes Model Mfr Co PO Box 721 Urbana IL 61801 John Sullivan Model Floatplane Products 1421 Second Street Callistoga CA 94515 Lens RC Enterprises Box 214 Mon trose BC Canada VOG lPO Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 sI KHAMPION 2-STROV IEK PINTQUART GALLON 0% Nitromethane $1075 5% Nitromethane $365$525$1275 10% Nitromethane $415$550$1475 15% Nitromethane $430$635$1675 25% Nitromethane $515$795$2195 35% Nitromethane $595$925$2695 10% Nitromethane$1425 15% Nitromethane$1625 -*/rn over 20 years SIG has blending finest quality model engine fuel available using st quality ingredients instance anol use 995% pure very best grade W money can buy also use real 100% pure t Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tam 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourself Prices subject change notice See aealer first available order direct Call _____ 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO IA 50171 Etfinger * says OnlyPlane Petterove Sets give assorted designs yoc WOt have selectod best classic dodges time noose choose fsm patfens tsr pan ae importans coclusive feature Golden Age Y Scale curtisa Hawk~ ength wingspan 2266 sq iv wing area 323 engines -4 channel RIC RCOS-14 8 /e Scale cuntiss Falcon I- \IA-A-J 83 length wing spae WI- 3t66sqinwingaea4ch RIG/ Y RCQS-t3 5 116 Scale cessna ing span sq wing area 26 66 engiens 43-4 channel RIG RC6S-t 8 113 Scale Piper cub J-3 11-9 wing span ength 2856 sq wing area 26 30 cid engines annel RIG RC3S-2 8 Quarter Scale WW SE-SA go wing span sq wing area 78 22 engines gCOS7 5 SPAD c-xlll 78 Ye spas 6 5s wing nine 13 1031 engines Capable flynt-it captores iwaginanion RCO6-8 5 FOKKER DR-i TRIPLANE 72 wing span sq wing area 78 166 engines RCOS-8 82495 SOPWITH CAMEL F1 84 wingspan 2t66 sq wisgareaett lhswloRIC Py wood ft balsa conettoction use 6$ sq 601 drawings RCOStt 5 N eWPiper Tn-Pacer PA-22 t 16-318 wing span sq wing area 20 30 cid esgines 4-h channel RIG nc t2 lbs 81116 scetall length Plswoodlbalsu fulselage removeable wing poonlo steerable nose wheel designed fo easy ground handling autbeotic scale tlight portormanve $C3S36299$ aill Effinger Feaediee Meerbar AMA NFFS Halt e$ Fame Prices $or camplele plans sub assembly aed detailed parts lists Add 8250 fee Mailing Tube Send ter brechure ahead 01 thu vrowd new boohun showing new Plan Sets 101986 Send St refundable 1st orderl WE TECHNICAL SERVICES PO Box 76884-A Atlanta GA 30328 October 1989 195