HOW WOULD YOU like tow variety signs next fun-fly First might assemble says BOMB DROP EVENT STARTS PROMPTLY AT 9 AM next message rib friends PLEASE REPLACE DI VOT AFTER EACH LANDING later reads DONT FORGET ELECTION NEXT MEETING Does raise lot questions hope because youre interested Id like tell you can make own fieldkit interchangeable letters tow just about sign want Heres project nutshell Youll make up individual characters letters numbers punctuation marks too want simple materials using conventional methods Youll make bridle towline front sign thing called drag back photo 1 Youll install releasable towhook bottom plane servo system operate big day arrives youll select letters need message connect together simply just few minutes youre ready go surprisingly youll find whole rig almost inde structible wont need super-plane tow ing youll find flying easy no big surprises Although novice shouldnt try good Sunday pilot can easily Circling field 50 100 feet sign easy read scale appearance gets attention time Before get details let set stage rest article recommendations based 18 months experience using 19-powered conventional RC model towing signs 12 15 feet long 6h-in-high let ters tow signs comparable ones describe learn towing safe easy steps Im confident youll have success Design Concepts Lets talk first about design requirements sign Obviously should light strong low drag towline towing bridle connecting lines needed make letters follow along order letters need stifleners leading edges theyll keep shapes balance weights bot tom edges sign will trail vertically lay over its side What isnt obvious need something minimize sign flutter know flag flutters breeze Well sign long slender flag would flutter grand scale except four simple things drag aft end tugs sign out straight letters flexible weight kept minimum balance weights used behind last letter sign factors pay off two ways aerodynamic forces expend themselves harmlessly fluttering trailing edges letters drag Reducing weight especially aft end prevents sign playing crack-the-whip normal small amount flutter does oc cur Dont surprised see little flut ter especially aft one-fourth sign real ones too 44 Model Aviation RC Towplane towplane se lect should will take off quickly climb rapidly fly slowly good stability TABLE 1 MATERIALS LIST Fabric polyester-cotton broadcloth Sequins 14 diameter Thread Talon Button & Carpet Extra Strong Bamboo 3/64 1/16 square 8 lengths Monofilament fishing line 4-pound test Lead split-shot weights size 3/0 about 3/16 diameter Swivel-snap size 5 Steel rings 3/8 diameter Releasable towhook EK Logictrol Stock No THR-1 Flexible servo cable braided metal Solder coreless 1/8 diameter Soft iron wire 1/32 diameter 1 The authors towplane high-lift design 580 sq powered veco 19 9/4 prop tows signs up 34 lettersabout 15 ft long Local club has used 25-powered Quick Stick 40-powered Sweet Stick 60-powered Aeromaster flown well below full throttle control have reserve power yond whats needed tow sign may want use lower pitch prop usual improve characteristics What type plane will work Ive pleasantly surprised find RC model can tow heck lot towplane photo 2 conventional high-lift design 580 sq powered standard Veco 19 turning 9/4 prop regularly tows signs up 34 letters length about 15 feet lifts sign off ground no struggle requires less full throttle maintain level flight Ive set limit 34 letters Ill have perform ance safety factor full sign full power can climb slowly up altitude signs have also towed three other planes club did job ease 25-powered QuickStick 40-powered Sweet-Stick 60-powered Aeromaster three slowed down well below full throttle maintain realistic airspeed circled field Sweet-Stick however has flown little faster desirable maintain safe control So can tow sign also drop before landing plane will need re leasable towhook should located bottom fuselage near cen ter gravity possible EK Logic trol hook does excellent job photo 3 shows mockup installation sim ple metal guard added front hook prevents towline falling off hook preparing takeoff light spring also added keep hook locked position until servo releases it How actuate towhook release servo will depend setup plane select ingenuity Since plane uses three channels use throttle servo bringing throttle full idle moves pushrod unlock towhook Towing Sign two methods lifting sign off ground both used LOCATE CONNECTOR LINE ALONG HERE LOCATE CONNECTOR POLE HERE LOCASE CCTITS2TC LINE /16 4 41/4 4 21/32 ASSENBLY BOARD LAYOUT Fig 1 Ij j II II LOCATE CONNECTOR LOOPS AT ONE OF THESE SEVEN DISTANCES SELECT DISTANCE B FROTI TLE 2 FOR THE LETTER BEING ASS~LED ALONG 4 13/16 5 1/in 5 7/16 DISTANCE B 111 1 I I December 1977 45 6 1 ~1 3 An EK releasable hook used towing allows dropping sign before landing three-channel system author used throttle servo release full idle moves pushrod unlock towhook 4 Before takeoff sign stretched out along takeoft path tew teet ott tne sloe ito avoio snagging gear aruurIi e forward connect towhook least 4 feet air passes over front sign steady climb plane will peel sign off ground 4-lb test monofilament line nylon rope pic visibility 36 40 ft long 46 Model Aviation 2 Basic elements sign front end left bridle towline right drag letters interchangeable 5 mockup photo portrays installation towhook b xternaI view ot tne TownooK drophook installation cable drophook drophook used lift sign aerial pickup release drophook clearly visible servos set lock used see text description rather tow takeoff both hooks Balsa spool pic 5 unwinds drophook cord 7 The drophook shaped soft iron wire must have no sharp projections Just enough solder added give little weight positive drop Note hole braided release cable engages old-timers still used today Either way interesting challenge RC pilot because realism both exciting spectators watch first method youll lift sign off ground plane takes off climbs out Start placing plane takeoff position Stretch sign out di rectly along takeoff path front sign nearest plane See photo 4 Connect monofilament towline bridle sign run free end line back plane straight back lays along takeoff path might catch landing gear horizontal stabilizer during takeoff So lay about 3 4 feet off side takeoff path bring around behind plane run up forward con nect towhook long should towline Just long enough plane can take off least 4 feet air passes over front sign steady normal climb As plane continues its climb sign will peel off ground follow along way sign never drags across ground Make towline 4-lb test monofilament tie 3/t-in towring end After gain experi ence youll want towline short good judgment will allow realis tic appearance plane requires 36- 45-ft towline length depends wind affects takeoff Make takeoffs wind sign gets kite-like lift during first few moments lift-off until starts trailing vertically considerably eases bur den towplane After climb-out regulate power airspeed fly slow path around field Use distances Dist WDist D 13/16 13/16 3 1/2 1 3/16 1 1/2 3 7/8 4 1/4 4 1/4 411/16 115/16 2 3/4 4 1/4 4 2 1/32 421/32 4 2 1/32 4 21/32 413/16 5 1/16 5 7/16 characters apostrophe Colon E F J L Space Period comma Dash B D N 0 P Q R U 2356789 T V X Y 4 C G H K S Z $ M W Note All dimensions inches characters except small punctuation marks 6 1/4 high characters have 1 3/16 stroke December 1977 47 8 Rig aerial pickup consists two 8-ft bamboo poles set about eight feet apart Drophook released circling field plane flown about 4 feet above pickup loop top poles Tie scraps bright colored cloth loop drophook visibility TABLE 2 CHARACTER DIMENSIONS nere planeout picture rlgntnas snaggea pickup ioop ax moaerame speea gone high-power climbout sign has begun peel off ground author right concentrates control 4-lb line will break hook something mistake 50 100 feet Fly just fast enough keep sign tugged out straight main tain safe controllable airspeed plane Flying too fast easy will appear unrealistic cause undue sign flutter Since letter flutters like miniature flag continuous high airspeed can eventually damage sign As might expect towing load like plane will fly slower given power setting therefore respond slowly control movements ever because towline attached center gravity plane should have positive control response no unusual flight characteristics speak towing load Im referring drag cre ated sign its weight com plete 30-letter sign including bridle drag weighs about 4 ounces weight little significance Dropping sign simple just actuate towhook release sign will drop gently ground no damage Now have doubts about self plane trying heres safe easy way first few flights tow word get feel system method try two words three etc making several flights stage until towing full sign prepared abort tow time plane sign doesnt have way want Just drop sign think over later time crease load climb up safe altitude check planes performance control response progressing slowly like youll accomplish two things 1 youll develop full confidence yourself plane 2 youll find out long sign plane can safely tow second method lift-off extra equipment required optional requires precise flying dont hesitate try itits fun method youll fly plane over sign pick up trailing drophook Youll need 13 assemble letter parts laid Out shown assembly board layout Use aliphatic glue like Titebond Household Cement Ambroid etc. will curl up fabric make too rigid See text 48 Model Aviation 10 Sign towing has its special language Shown terms will using materials need listed Table 1 11 plentiful supply pre-cut bamboo oriental wall hangings found import shops department stores Other items found fishing tackle counter fabric store hobby shop 12 Preparing materials make character Also see Fig 11 Shown bamboo strips connector pole stiffeners two connector linesbutton carpet thread pieces about 10 long same towhook before youll also need drophook towline release mechanism shown photos 5 6 7 towline run 10-ft length monofila ment through center rectangular balsa spool Tie towring top end drophook bottom end Make drophook soft iron wire has no sharp projections just enough solder give little weight store line flight keep tangling wrap snugly around spool place spool hook hook-housing Put towring towhook set servos secure towhook drophook place prior flight braided throttle cable shown works fine drophook release As before Ill leave design servo action needed release drophook Photo 8 shows rig sign pickup Set up two 8-ft bamboo poles about 8 feet apart Beforehand make small vee-notch tip pole Lay sign out along flight path did first method towing bridle centered between poles make 24-ft monofilament line pickup loop Connect both ends line bridle lay loop formed across top two notched poles Last tie piece bright-colored yarn center loop another piece end drophook make visible Take off release drophook circling field As falls towline will unwind balsa spool until fully extended Since airstream will make trail back angle hook will about 8 feet below plane Guide plane moderate speed fly about 4 feet above center poles Just plane reaches poles apply full throttle establish normal climb did everything right drophook will catch pickup loop sign will gently peel off ground photo 9 didnt can always circle around try again dimensions given total towline will 22 feet long drophook line 10 feet pickup loop stretches out 12 feet length gives realistic appearance longer towline may need takeoff method Now understand sign picked up consider two precautions Use 4-lb test monofilamentif hook something mistake youll glad breaks Dont plant poles too firmly ground Can guess Now can tow sign dont recom mend novice dont think have expert pattern-pilot either best advice can fly plane vice versa can make plane go want what want can tow sign Sign Construction First check terms well using shown photo 10 materials youll need listed Ta ble 1 quantities arent specified since will depend letters tend make fabric store fishing tackle counter favorite hobby shop will supply needs except photo 11 reveals can find plentiful supply pre-cut bam boo oriental wall-hangings can find import shops department stores quality size strips vary somewhat after cull out December1977 49 14 Four steps forming connector end connector pole R Retainer sequins forced over bamboo connector pole shish kebab style Drill hole piece hardwood handy tool 15 character has connector pole front connector loops back Strip bamboo stiffens edge leading edge characterexcept commas etcrequire balance weight bottom 16 same principles applied characters whether letters numerals punctuation marks spaces between char acters nothing two connector lines connector pole 17 towing bridle must rugged because takes full brunt towing load Note strip solder wrapped around bottom bridle connector pole front sign trails vertically rest follows bad ones youll have toughest materials going Use strips about 3/64 1/16-in square slight variations wont hurt Now about shape letters Space wont permit drawing out whole alphabet plenty reference books However recommend using Gothic style letters shown Theyre boxy enough simple make yet have some eye-appeal easy read Also Id like recommend some basic proportions sizes letters will provide weight drag similar have tested Table 2 can see characters except small punctuation marks 6-in high have 1-3/16-in stroke will probably know letters same width spacing between different combinations letters varies give pleasing appearance Table 2 distances W D provided pur pose Once youve designed letters around basic proportions draw out 5 X 8 card can used template punch tiny holes card lines forming letters intersect Lay template fabric line edge card up fabric grain push felt-tipped pen through hole provide points outlining letter As cut letter out handle raw edges care prevent raveling Youll read later prevent finished letter Next youll need prepare simple assembly-board hold pieces let ter place glue together Fig 1 shows lay out piece ply wood Any letters numbers punc tuation marks can assembled scheme difference being locate connector loops establish distance D character making Photo 12 shows next step preparing materials make letter Cut out letter want start select bamboo strips connector pole stiffeners Next prepare two connector lines cut piece button capret thread about 10 long Form connector loop tying snugly around scrap Nyrod tubing slightly smaller diameter se quins used form connector see photo 14 A-in diameter sequins 3/16-in diameter Nyrod works out just right Apply drop glue knot before trimming off excess thread Make sure glue doesnt penetrate loop itself because loop should remain soft limber photos 12 14 can see loops connectors form simple connections between letters con necting letters together 1oop will stretch out oval shape slide over con nector easily sign towed 1oop stretches out tightly remains secure its connector Disassembling letters equally simple suggest make up sample two 1oop connector make sure assemble easily yet secure subjected pull assemble letter lay parts out shown photo 13 Insert pins brads assembly-board establish distance D Table 2 would 4-21/32 number 8 shown being assem bled sure connector lines under slight equal tension apply slender bead blue along joints tween bamboo thread fabric Make sure glue joints complete keep narrow possible letter will remain flexible Use aliphatic glue like Titebond household Ambroid glue will curl up fabric also make too rigid Youll find helpful hold bamboo strips down heavy fishing weights glue dries Next use small paint brush coat Continued page 91 50 Model Aviation 18 An expanding file provides handy storage keeps letters unwrinkled Authors kit contain 106 characters including five commonly used letters assembles sign field 15 minutes must have lost frequency pin club project qualify several pilots airplanes WHEELS RO WHEELS Smooth inflatable wheels big airplanes Features two piece bolt gether hubs hub caps Wheels can inflated deflated thru tiny valve side tire pressure de sire Truly remark able realistic looking wheel I$795 Pair 450R4-1 /2 Diameter995 Pair SOOR 5 Diameter11 95 Pair 550R5-1 /2 Diameter1 395 Pair 600R ameter1 595 Pair Low bounce shock absorbing wheels featuring 6 spoke dura hub finest quality hand inspected 175Tor RWheels 1-3/4$219 Pair 200 T RWheels 2239 Pair 225 T R SWheels 2-1/4259 Pair 250 T R SWheels 2-1/2279 Pair 275 T R 5Wheels 2-3/4299 Pair 300 T R 5Wheels 3319 Pair 325 T RWheels 3-1 /4339 Pair 350 T RWheels 3-1/2359 Pair DUBRO PRODUCTS INCORPORATED 480 BONNER ROAD WAUCONDA ILL 60084 total duration 75623 Fortunately FAI Sporting Code states explicitly required seaplanes land water So new record record-setting plane tree top Glenn Scillian went get help friends area spied ropes holding up canopy ropes hatchet John Tallmans car plunged through poison ivy base plane-eating tree climbed tree attacked offending branches After long exhausting work Shark fell stages ground delighted find damage minimal Lots fuel left later measure ment showed 35 fi oz 42% origi nal fuel remained tanks enough additional 5 hours same rate fuel usage longer leaner mixture ligher model ever records made actual rather potential performance Surpassing German record 25% quite satis fying result Special thanks order official witnesses some took day va cation leave help Friday lake busy Particular recognition due invisible Kenny Greenhouse Long ago Kenny assigned role documenting record attempts camera have never picture record articles Thanks also Dean Smith Lee Shiflett supplied critical parts flight Record setting exciting re warding activity doesnt require weekly travel follow contest circuit yet can compete entire world Opti mizing element modelair frame engine fuel system other componentsis necessary succeed Originality needed since wont find standardized approaches seen nor mal competition Free flight neglected area USA has 27 outdoor free flight records nearly held eastern European countries Control line radio control also have room improved performances Lets get going Tow Signs/Layers continued page 50 remaining raw fabric edges aliphatic glue has thinned 50-50 water Coat just /8-in margin fab ric will effectively stop edges raveling yet leave letter flexi ble After glue dry remove letter board trim off excess thread rough fabric edges part stiffener extends beyond edge letter Leave connector pole extra long now Photo 14 shows steps forming connector end connector pole Notice letters square front corners must have fabric cut out slight ly area Slip two sequins place leaving 1/16 3/32 between Although hole sequins small can forced over bamboo easily shish kebab style scrap ply wood hole makes fine tool push trim off bamboo leaving about 1/32 projecting form good glue joint Now glue sequins place epoxy sure form complete fillet epoxy between bamboo sequin surfaces As form inboard fillet let epoxy cover joint between connector line thread connector pole reinforcement junction pole sequins thread must good strong since entire towing load concentrated point last step letter finished Slide split-shot weight place photo 14 squeeze tightly fastened over both connector line thread fabric Youll have trim fabric edge back little get weight right position shapes other characters vary illustrated construc tion principles same charac ter has connector pole front connector loops back strip bamboo stiffens edge lead ing edge character needs balance December1977 91 WHOLE NEW LINE OF SMOOTH INFLATABLE BIG WHEELS 4 4Y 5 51h& 6 TREAD T SMOOTH R SLICKS 5 2 KITS e PLANS ACCESSORIES 1417 ME 17W SPAN STOCK NO PP 15 KIT $425 4 WALNUT SCALE KITS RART ACE$425 PEANUT SCALE KITS J3 CUE$329 PIREENPOL$329 MILES$329 TURRULENT$329 MUSTANG$349 ZERO$349 COUGAR$349 AIIIDREASOId$349 GIPSY MOTH$349 GANAGORIE$349 SPORT MODEL KITS ONE NITE 28$475 ONE NITE 16$349 STRINGLESS WONDER$249 PEcK ROD$139 KITS 0 PLANS S ACCESSORIES REAL JAPANESE TISSUEPROPS COMPLETE CATALOG 50 MANY HARD TO FIND ITEMS pP 0 BOX 2498 -AMALA MESA CAUF 92041 WPHONE 7141 4694675 17141 4424636 weight except very light ones such letter comma space Look over various photos especially photos 15 16 youll see principles applied entire alpha bet numbers punctuation marks Youll see too space nothing two connector lines connector pole Making letter takes little time reading about making lots sounds tedious lay out Fig 1 pattern ten places sheet plywood can assembly-line project making several time simplicity drag shown photo 17 assembly methods same four fingers formed cut ting slits drag better job re ducing flutter solid piece fabric Incidentally Ive tried variety drag de signs including U-shaped type used real signs Although shown doesnt provide scale appearance does best job sure coat raw fabric edges thinned-out glue dont put bal ance weight drag towing bridle also shown photo 17 must rugged because takes full brunt towing load Use monofila ment bridle rather thread use heavier bamboo dowel about 3/32 diameter pole Tie monofil ament swivel-snap 2 di mension wont change tie end pole After can form connector loops about 1 hind pole Epoxy monofilament pole epoxy knots too Wrap 4 inches A-in solder around bottom pole balance weight get front sign trail verti cally rest sign inclined same Now letters numbers punctuation marks will need Heres easy way find own answer Plan first sign message youll want tow regularly Mine read JOIN THE PALM BEACH SKYHAWKS TODAY provides beginning letter inventory lets start fly ing soon possible invent new messages tow build addi tional characters need way can build inventory over long period time yet enjoy towing signs youre doing field kit photo 18 contains 106 characters has five commonly used letters fewer others expanding file shown provides handy storage keeps letters un wrinkled Come think have 107 last Santa-in-a-sleigh towed front Merry Christmas sign suggest keep written inventory characters have time plan message can check quickly see have enough As Ns Ts etc make plan sign find lack certain letters complete stop think slight rewording might put idea across letters have STATEMENT OF OWNERS*41P MANAGEMENT AND CIRCULATION Rrqojred 39 USC 3683 1 TeIeoIPc6lisssion MODELAVIATION A PaIIuetofl No. 067930 2 Date ol Filing Sepseonben 13 1577 3 Frequency 01 sue Monthly A No01 Sues Publtehed Annually 12 8 Annual Sattcnipnon Prico Sn20G 4 Location 01 known OlIton 01 putaication street city county stale ZIP code pnnnnrsl 815 FIteenttn Sn NW Weahiognon DC 2008h 5 Location headquarters aecerel business offices publishers Non printers 815 Fitneensh St. NW Weshinston DC 211015 6 Names connplens addrinses Publisher Editor Monesins Editor PutnlelnOr Gel S Whenlen 015 Fjtteanth Sn. NW Washinason DC 20605 Editor Wlliaen 3 Winner 8th Ftneennh Sn. NW Wsshington DC 20006 Managing Edsor NONE 7Owner Acscssecyol Model Aeronautios81h Fmfttenth Sn. NW Washington DC 206155 8Know bondltolders wor69gees Other tacOriny holders owning hold jog n% went total amount 01 bonds orornns Othpr securities NONE S For coenpienmon nonptotit organicotions authorized snail spocial rates Igoonror 132n22 PSMI Tbn purpose lunction end nonprolit status nhs orOenjeeton tuempn status Icr Foderal incowe too ponprees ham non changed during preceding 12 moonhe Ecoent cod Nalorr Cnculation nIl Actual Acerageno copies no copies01 tiOgir eachissueissue duriogoublished prenadingnearest l2nlectheillingdane ATotal No COpes Printed Net Press Ron3703530106 BPard Ciroulation 1 Sales lhruuoh Dealers end Carriers SIrens Veodurs end Counter Sales23742306 2Mail Subtonrytross2911732d1S CTotal Paid Circulanmoo31 49135211 0Frco Djsgnibullun Mel Carrier Other Meaos Samylns Complmennary Other Finn Copres360621 30 ETotal Distribution Suns C cod Dl3517737341 FCopies No Dtnributerl 1Oltise Usc LOttOmr Unacoocoted Seciled eltor Printing10691750 2Returns row New Agente UTotal Sum E Fl end 2should equal press run show Al3703h39106 11 I certify stagrorennO made abum ore correct complete CARL S WFIEE LET Publisher Big Day Arrives Okay now youre ready try signs first time some final thoughts remind ers get field youll find takes 15 minutes assemble full sign decide make up night before flying youll pleased learn complete sign folds neatly shoe box room left lunch sure keep signs dry make sure grass isnt damp lay out fabric would soak up moisture like blotter youd never get off ground Using item start lets make up checklist precautions first few flights 1 Keep signs dry 2 Before takeoff check sign sure connectors secure wind flips sign about check again 3 Do test flying easy stages first word two 4 Keep spectators off side make pass drophook trail ing 5 Make sign lift-offs wind make normal climb-outs 6 During lift-off keep eyes tention plane Dont worry about signit will follow along has no other choice 7 Be prepared drop sign en gine falters especially during lift-off climb-out 8 Maintain performance safety factor never towing sign long cant climb plane altitude 9 Abide field safety rules usual Youll tempted tow sign right over crowd dont End Well thats build em thats tow em hope readers will try because its chal lenging yet useful project Also might want look prospects making club project parcel out work making kit letters qualif several planes pilots towing So last 33 letters Ill close saying TRY TOWING YOUR OWN SIGNSITSALOTTA FUN Lets see now takes 5 Ts 2 Rs 2 Ys 4 0s tographs article made Lee Boozer Jimmy Zeak Chuck Stevens Emilic Fuente Bill Layers members Palm Beach Sky hawks Engine Technique/Jehlik continued page 51 surplus metal ammo box about 14 X 18 X 20 can store running equipment box Tank I prefer round RC klunk tank mounted auto hose clamp screwed top box Tank filler Anything squeeze bulb 92 Model Aviation FLY wITM R95511 eWUR 69tet 0 WALNUT SCALE ASK POE OUR KITS AND ACCESSORIES Al YOUR LOCAL DEALER IF NOT AVAILARLE AT YOUR DEALER ORDER DIRECT ADD 60 POSTAGE BROWN CO-2 ENGINES ENGINES ARE IN STOCK NEW CHARGER AND S SIZES OF TANKS RROWN ENGINES MUST RE ORDERED DIRECT FROM PECK-POLYMERS
Edition: Model Aviation - 1977/12
Page Numbers: 44, 45, 46, 47, 48, 49, 50, 91, 92
HOW WOULD YOU like tow variety signs next fun-fly First might assemble says BOMB DROP EVENT STARTS PROMPTLY AT 9 AM next message rib friends PLEASE REPLACE DI VOT AFTER EACH LANDING later reads DONT FORGET ELECTION NEXT MEETING Does raise lot questions hope because youre interested Id like tell you can make own fieldkit interchangeable letters tow just about sign want Heres project nutshell Youll make up individual characters letters numbers punctuation marks too want simple materials using conventional methods Youll make bridle towline front sign thing called drag back photo 1 Youll install releasable towhook bottom plane servo system operate big day arrives youll select letters need message connect together simply just few minutes youre ready go surprisingly youll find whole rig almost inde structible wont need super-plane tow ing youll find flying easy no big surprises Although novice shouldnt try good Sunday pilot can easily Circling field 50 100 feet sign easy read scale appearance gets attention time Before get details let set stage rest article recommendations based 18 months experience using 19-powered conventional RC model towing signs 12 15 feet long 6h-in-high let ters tow signs comparable ones describe learn towing safe easy steps Im confident youll have success Design Concepts Lets talk first about design requirements sign Obviously should light strong low drag towline towing bridle connecting lines needed make letters follow along order letters need stifleners leading edges theyll keep shapes balance weights bot tom edges sign will trail vertically lay over its side What isnt obvious need something minimize sign flutter know flag flutters breeze Well sign long slender flag would flutter grand scale except four simple things drag aft end tugs sign out straight letters flexible weight kept minimum balance weights used behind last letter sign factors pay off two ways aerodynamic forces expend themselves harmlessly fluttering trailing edges letters drag Reducing weight especially aft end prevents sign playing crack-the-whip normal small amount flutter does oc cur Dont surprised see little flut ter especially aft one-fourth sign real ones too 44 Model Aviation RC Towplane towplane se lect should will take off quickly climb rapidly fly slowly good stability TABLE 1 MATERIALS LIST Fabric polyester-cotton broadcloth Sequins 14 diameter Thread Talon Button & Carpet Extra Strong Bamboo 3/64 1/16 square 8 lengths Monofilament fishing line 4-pound test Lead split-shot weights size 3/0 about 3/16 diameter Swivel-snap size 5 Steel rings 3/8 diameter Releasable towhook EK Logictrol Stock No THR-1 Flexible servo cable braided metal Solder coreless 1/8 diameter Soft iron wire 1/32 diameter 1 The authors towplane high-lift design 580 sq powered veco 19 9/4 prop tows signs up 34 lettersabout 15 ft long Local club has used 25-powered Quick Stick 40-powered Sweet Stick 60-powered Aeromaster flown well below full throttle control have reserve power yond whats needed tow sign may want use lower pitch prop usual improve characteristics What type plane will work Ive pleasantly surprised find RC model can tow heck lot towplane photo 2 conventional high-lift design 580 sq powered standard Veco 19 turning 9/4 prop regularly tows signs up 34 letters length about 15 feet lifts sign off ground no struggle requires less full throttle maintain level flight Ive set limit 34 letters Ill have perform ance safety factor full sign full power can climb slowly up altitude signs have also towed three other planes club did job ease 25-powered QuickStick 40-powered Sweet-Stick 60-powered Aeromaster three slowed down well below full throttle maintain realistic airspeed circled field Sweet-Stick however has flown little faster desirable maintain safe control So can tow sign also drop before landing plane will need re leasable towhook should located bottom fuselage near cen ter gravity possible EK Logic trol hook does excellent job photo 3 shows mockup installation sim ple metal guard added front hook prevents towline falling off hook preparing takeoff light spring also added keep hook locked position until servo releases it How actuate towhook release servo will depend setup plane select ingenuity Since plane uses three channels use throttle servo bringing throttle full idle moves pushrod unlock towhook Towing Sign two methods lifting sign off ground both used LOCATE CONNECTOR LINE ALONG HERE LOCATE CONNECTOR POLE HERE LOCASE CCTITS2TC LINE /16 4 41/4 4 21/32 ASSENBLY BOARD LAYOUT Fig 1 Ij j II II LOCATE CONNECTOR LOOPS AT ONE OF THESE SEVEN DISTANCES SELECT DISTANCE B FROTI TLE 2 FOR THE LETTER BEING ASS~LED ALONG 4 13/16 5 1/in 5 7/16 DISTANCE B 111 1 I I December 1977 45 6 1 ~1 3 An EK releasable hook used towing allows dropping sign before landing three-channel system author used throttle servo release full idle moves pushrod unlock towhook 4 Before takeoff sign stretched out along takeoft path tew teet ott tne sloe ito avoio snagging gear aruurIi e forward connect towhook least 4 feet air passes over front sign steady climb plane will peel sign off ground 4-lb test monofilament line nylon rope pic visibility 36 40 ft long 46 Model Aviation 2 Basic elements sign front end left bridle towline right drag letters interchangeable 5 mockup photo portrays installation towhook b xternaI view ot tne TownooK drophook installation cable drophook drophook used lift sign aerial pickup release drophook clearly visible servos set lock used see text description rather tow takeoff both hooks Balsa spool pic 5 unwinds drophook cord 7 The drophook shaped soft iron wire must have no sharp projections Just enough solder added give little weight positive drop Note hole braided release cable engages old-timers still used today Either way interesting challenge RC pilot because realism both exciting spectators watch first method youll lift sign off ground plane takes off climbs out Start placing plane takeoff position Stretch sign out di rectly along takeoff path front sign nearest plane See photo 4 Connect monofilament towline bridle sign run free end line back plane straight back lays along takeoff path might catch landing gear horizontal stabilizer during takeoff So lay about 3 4 feet off side takeoff path bring around behind plane run up forward con nect towhook long should towline Just long enough plane can take off least 4 feet air passes over front sign steady normal climb As plane continues its climb sign will peel off ground follow along way sign never drags across ground Make towline 4-lb test monofilament tie 3/t-in towring end After gain experi ence youll want towline short good judgment will allow realis tic appearance plane requires 36- 45-ft towline length depends wind affects takeoff Make takeoffs wind sign gets kite-like lift during first few moments lift-off until starts trailing vertically considerably eases bur den towplane After climb-out regulate power airspeed fly slow path around field Use distances Dist WDist D 13/16 13/16 3 1/2 1 3/16 1 1/2 3 7/8 4 1/4 4 1/4 411/16 115/16 2 3/4 4 1/4 4 2 1/32 421/32 4 2 1/32 4 21/32 413/16 5 1/16 5 7/16 characters apostrophe Colon E F J L Space Period comma Dash B D N 0 P Q R U 2356789 T V X Y 4 C G H K S Z $ M W Note All dimensions inches characters except small punctuation marks 6 1/4 high characters have 1 3/16 stroke December 1977 47 8 Rig aerial pickup consists two 8-ft bamboo poles set about eight feet apart Drophook released circling field plane flown about 4 feet above pickup loop top poles Tie scraps bright colored cloth loop drophook visibility TABLE 2 CHARACTER DIMENSIONS nere planeout picture rlgntnas snaggea pickup ioop ax moaerame speea gone high-power climbout sign has begun peel off ground author right concentrates control 4-lb line will break hook something mistake 50 100 feet Fly just fast enough keep sign tugged out straight main tain safe controllable airspeed plane Flying too fast easy will appear unrealistic cause undue sign flutter Since letter flutters like miniature flag continuous high airspeed can eventually damage sign As might expect towing load like plane will fly slower given power setting therefore respond slowly control movements ever because towline attached center gravity plane should have positive control response no unusual flight characteristics speak towing load Im referring drag cre ated sign its weight com plete 30-letter sign including bridle drag weighs about 4 ounces weight little significance Dropping sign simple just actuate towhook release sign will drop gently ground no damage Now have doubts about self plane trying heres safe easy way first few flights tow word get feel system method try two words three etc making several flights stage until towing full sign prepared abort tow time plane sign doesnt have way want Just drop sign think over later time crease load climb up safe altitude check planes performance control response progressing slowly like youll accomplish two things 1 youll develop full confidence yourself plane 2 youll find out long sign plane can safely tow second method lift-off extra equipment required optional requires precise flying dont hesitate try itits fun method youll fly plane over sign pick up trailing drophook Youll need 13 assemble letter parts laid Out shown assembly board layout Use aliphatic glue like Titebond Household Cement Ambroid etc. will curl up fabric make too rigid See text 48 Model Aviation 10 Sign towing has its special language Shown terms will using materials need listed Table 1 11 plentiful supply pre-cut bamboo oriental wall hangings found import shops department stores Other items found fishing tackle counter fabric store hobby shop 12 Preparing materials make character Also see Fig 11 Shown bamboo strips connector pole stiffeners two connector linesbutton carpet thread pieces about 10 long same towhook before youll also need drophook towline release mechanism shown photos 5 6 7 towline run 10-ft length monofila ment through center rectangular balsa spool Tie towring top end drophook bottom end Make drophook soft iron wire has no sharp projections just enough solder give little weight store line flight keep tangling wrap snugly around spool place spool hook hook-housing Put towring towhook set servos secure towhook drophook place prior flight braided throttle cable shown works fine drophook release As before Ill leave design servo action needed release drophook Photo 8 shows rig sign pickup Set up two 8-ft bamboo poles about 8 feet apart Beforehand make small vee-notch tip pole Lay sign out along flight path did first method towing bridle centered between poles make 24-ft monofilament line pickup loop Connect both ends line bridle lay loop formed across top two notched poles Last tie piece bright-colored yarn center loop another piece end drophook make visible Take off release drophook circling field As falls towline will unwind balsa spool until fully extended Since airstream will make trail back angle hook will about 8 feet below plane Guide plane moderate speed fly about 4 feet above center poles Just plane reaches poles apply full throttle establish normal climb did everything right drophook will catch pickup loop sign will gently peel off ground photo 9 didnt can always circle around try again dimensions given total towline will 22 feet long drophook line 10 feet pickup loop stretches out 12 feet length gives realistic appearance longer towline may need takeoff method Now understand sign picked up consider two precautions Use 4-lb test monofilamentif hook something mistake youll glad breaks Dont plant poles too firmly ground Can guess Now can tow sign dont recom mend novice dont think have expert pattern-pilot either best advice can fly plane vice versa can make plane go want what want can tow sign Sign Construction First check terms well using shown photo 10 materials youll need listed Ta ble 1 quantities arent specified since will depend letters tend make fabric store fishing tackle counter favorite hobby shop will supply needs except photo 11 reveals can find plentiful supply pre-cut bam boo oriental wall-hangings can find import shops department stores quality size strips vary somewhat after cull out December1977 49 14 Four steps forming connector end connector pole R Retainer sequins forced over bamboo connector pole shish kebab style Drill hole piece hardwood handy tool 15 character has connector pole front connector loops back Strip bamboo stiffens edge leading edge characterexcept commas etcrequire balance weight bottom 16 same principles applied characters whether letters numerals punctuation marks spaces between char acters nothing two connector lines connector pole 17 towing bridle must rugged because takes full brunt towing load Note strip solder wrapped around bottom bridle connector pole front sign trails vertically rest follows bad ones youll have toughest materials going Use strips about 3/64 1/16-in square slight variations wont hurt Now about shape letters Space wont permit drawing out whole alphabet plenty reference books However recommend using Gothic style letters shown Theyre boxy enough simple make yet have some eye-appeal easy read Also Id like recommend some basic proportions sizes letters will provide weight drag similar have tested Table 2 can see characters except small punctuation marks 6-in high have 1-3/16-in stroke will probably know letters same width spacing between different combinations letters varies give pleasing appearance Table 2 distances W D provided pur pose Once youve designed letters around basic proportions draw out 5 X 8 card can used template punch tiny holes card lines forming letters intersect Lay template fabric line edge card up fabric grain push felt-tipped pen through hole provide points outlining letter As cut letter out handle raw edges care prevent raveling Youll read later prevent finished letter Next youll need prepare simple assembly-board hold pieces let ter place glue together Fig 1 shows lay out piece ply wood Any letters numbers punc tuation marks can assembled scheme difference being locate connector loops establish distance D character making Photo 12 shows next step preparing materials make letter Cut out letter want start select bamboo strips connector pole stiffeners Next prepare two connector lines cut piece button capret thread about 10 long Form connector loop tying snugly around scrap Nyrod tubing slightly smaller diameter se quins used form connector see photo 14 A-in diameter sequins 3/16-in diameter Nyrod works out just right Apply drop glue knot before trimming off excess thread Make sure glue doesnt penetrate loop itself because loop should remain soft limber photos 12 14 can see loops connectors form simple connections between letters con necting letters together 1oop will stretch out oval shape slide over con nector easily sign towed 1oop stretches out tightly remains secure its connector Disassembling letters equally simple suggest make up sample two 1oop connector make sure assemble easily yet secure subjected pull assemble letter lay parts out shown photo 13 Insert pins brads assembly-board establish distance D Table 2 would 4-21/32 number 8 shown being assem bled sure connector lines under slight equal tension apply slender bead blue along joints tween bamboo thread fabric Make sure glue joints complete keep narrow possible letter will remain flexible Use aliphatic glue like Titebond household Ambroid glue will curl up fabric also make too rigid Youll find helpful hold bamboo strips down heavy fishing weights glue dries Next use small paint brush coat Continued page 91 50 Model Aviation 18 An expanding file provides handy storage keeps letters unwrinkled Authors kit contain 106 characters including five commonly used letters assembles sign field 15 minutes must have lost frequency pin club project qualify several pilots airplanes WHEELS RO WHEELS Smooth inflatable wheels big airplanes Features two piece bolt gether hubs hub caps Wheels can inflated deflated thru tiny valve side tire pressure de sire Truly remark able realistic looking wheel I$795 Pair 450R4-1 /2 Diameter995 Pair SOOR 5 Diameter11 95 Pair 550R5-1 /2 Diameter1 395 Pair 600R ameter1 595 Pair Low bounce shock absorbing wheels featuring 6 spoke dura hub finest quality hand inspected 175Tor RWheels 1-3/4$219 Pair 200 T RWheels 2239 Pair 225 T R SWheels 2-1/4259 Pair 250 T R SWheels 2-1/2279 Pair 275 T R 5Wheels 2-3/4299 Pair 300 T R 5Wheels 3319 Pair 325 T RWheels 3-1 /4339 Pair 350 T RWheels 3-1/2359 Pair DUBRO PRODUCTS INCORPORATED 480 BONNER ROAD WAUCONDA ILL 60084 total duration 75623 Fortunately FAI Sporting Code states explicitly required seaplanes land water So new record record-setting plane tree top Glenn Scillian went get help friends area spied ropes holding up canopy ropes hatchet John Tallmans car plunged through poison ivy base plane-eating tree climbed tree attacked offending branches After long exhausting work Shark fell stages ground delighted find damage minimal Lots fuel left later measure ment showed 35 fi oz 42% origi nal fuel remained tanks enough additional 5 hours same rate fuel usage longer leaner mixture ligher model ever records made actual rather potential performance Surpassing German record 25% quite satis fying result Special thanks order official witnesses some took day va cation leave help Friday lake busy Particular recognition due invisible Kenny Greenhouse Long ago Kenny assigned role documenting record attempts camera have never picture record articles Thanks also Dean Smith Lee Shiflett supplied critical parts flight Record setting exciting re warding activity doesnt require weekly travel follow contest circuit yet can compete entire world Opti mizing element modelair frame engine fuel system other componentsis necessary succeed Originality needed since wont find standardized approaches seen nor mal competition Free flight neglected area USA has 27 outdoor free flight records nearly held eastern European countries Control line radio control also have room improved performances Lets get going Tow Signs/Layers continued page 50 remaining raw fabric edges aliphatic glue has thinned 50-50 water Coat just /8-in margin fab ric will effectively stop edges raveling yet leave letter flexi ble After glue dry remove letter board trim off excess thread rough fabric edges part stiffener extends beyond edge letter Leave connector pole extra long now Photo 14 shows steps forming connector end connector pole Notice letters square front corners must have fabric cut out slight ly area Slip two sequins place leaving 1/16 3/32 between Although hole sequins small can forced over bamboo easily shish kebab style scrap ply wood hole makes fine tool push trim off bamboo leaving about 1/32 projecting form good glue joint Now glue sequins place epoxy sure form complete fillet epoxy between bamboo sequin surfaces As form inboard fillet let epoxy cover joint between connector line thread connector pole reinforcement junction pole sequins thread must good strong since entire towing load concentrated point last step letter finished Slide split-shot weight place photo 14 squeeze tightly fastened over both connector line thread fabric Youll have trim fabric edge back little get weight right position shapes other characters vary illustrated construc tion principles same charac ter has connector pole front connector loops back strip bamboo stiffens edge lead ing edge character needs balance December1977 91 WHOLE NEW LINE OF SMOOTH INFLATABLE BIG WHEELS 4 4Y 5 51h& 6 TREAD T SMOOTH R SLICKS 5 2 KITS e PLANS ACCESSORIES 1417 ME 17W SPAN STOCK NO PP 15 KIT $425 4 WALNUT SCALE KITS RART ACE$425 PEANUT SCALE KITS J3 CUE$329 PIREENPOL$329 MILES$329 TURRULENT$329 MUSTANG$349 ZERO$349 COUGAR$349 AIIIDREASOId$349 GIPSY MOTH$349 GANAGORIE$349 SPORT MODEL KITS ONE NITE 28$475 ONE NITE 16$349 STRINGLESS WONDER$249 PEcK ROD$139 KITS 0 PLANS S ACCESSORIES REAL JAPANESE TISSUEPROPS COMPLETE CATALOG 50 MANY HARD TO FIND ITEMS pP 0 BOX 2498 -AMALA MESA CAUF 92041 WPHONE 7141 4694675 17141 4424636 weight except very light ones such letter comma space Look over various photos especially photos 15 16 youll see principles applied entire alpha bet numbers punctuation marks Youll see too space nothing two connector lines connector pole Making letter takes little time reading about making lots sounds tedious lay out Fig 1 pattern ten places sheet plywood can assembly-line project making several time simplicity drag shown photo 17 assembly methods same four fingers formed cut ting slits drag better job re ducing flutter solid piece fabric Incidentally Ive tried variety drag de signs including U-shaped type used real signs Although shown doesnt provide scale appearance does best job sure coat raw fabric edges thinned-out glue dont put bal ance weight drag towing bridle also shown photo 17 must rugged because takes full brunt towing load Use monofila ment bridle rather thread use heavier bamboo dowel about 3/32 diameter pole Tie monofil ament swivel-snap 2 di mension wont change tie end pole After can form connector loops about 1 hind pole Epoxy monofilament pole epoxy knots too Wrap 4 inches A-in solder around bottom pole balance weight get front sign trail verti cally rest sign inclined same Now letters numbers punctuation marks will need Heres easy way find own answer Plan first sign message youll want tow regularly Mine read JOIN THE PALM BEACH SKYHAWKS TODAY provides beginning letter inventory lets start fly ing soon possible invent new messages tow build addi tional characters need way can build inventory over long period time yet enjoy towing signs youre doing field kit photo 18 contains 106 characters has five commonly used letters fewer others expanding file shown provides handy storage keeps letters un wrinkled Come think have 107 last Santa-in-a-sleigh towed front Merry Christmas sign suggest keep written inventory characters have time plan message can check quickly see have enough As Ns Ts etc make plan sign find lack certain letters complete stop think slight rewording might put idea across letters have STATEMENT OF OWNERS*41P MANAGEMENT AND CIRCULATION Rrqojred 39 USC 3683 1 TeIeoIPc6lisssion MODELAVIATION A PaIIuetofl No. 067930 2 Date ol Filing Sepseonben 13 1577 3 Frequency 01 sue Monthly A No01 Sues Publtehed Annually 12 8 Annual Sattcnipnon Prico Sn20G 4 Location 01 known OlIton 01 putaication street city county stale ZIP code pnnnnrsl 815 FIteenttn Sn NW Weahiognon DC 2008h 5 Location headquarters aecerel business offices publishers Non printers 815 Fitneensh St. NW Weshinston DC 211015 6 Names connplens addrinses Publisher Editor Monesins Editor PutnlelnOr Gel S Whenlen 015 Fjtteanth Sn. NW Washinason DC 20605 Editor Wlliaen 3 Winner 8th Ftneennh Sn. NW Wsshington DC 20006 Managing Edsor NONE 7Owner Acscssecyol Model Aeronautios81h Fmfttenth Sn. NW Washington DC 206155 8Know bondltolders wor69gees Other tacOriny holders owning hold jog n% went total amount 01 bonds orornns Othpr securities NONE S For coenpienmon nonptotit organicotions authorized snail spocial rates Igoonror 132n22 PSMI Tbn purpose lunction end nonprolit status nhs orOenjeeton tuempn status Icr Foderal incowe too ponprees ham non changed during preceding 12 moonhe Ecoent cod Nalorr Cnculation nIl Actual Acerageno copies no copies01 tiOgir eachissueissue duriogoublished prenadingnearest l2nlectheillingdane ATotal No COpes Printed Net Press Ron3703530106 BPard Ciroulation 1 Sales lhruuoh Dealers end Carriers SIrens Veodurs end Counter Sales23742306 2Mail Subtonrytross2911732d1S CTotal Paid Circulanmoo31 49135211 0Frco Djsgnibullun Mel Carrier Other Meaos Samylns Complmennary Other Finn Copres360621 30 ETotal Distribution Suns C cod Dl3517737341 FCopies No Dtnributerl 1Oltise Usc LOttOmr Unacoocoted Seciled eltor Printing10691750 2Returns row New Agente UTotal Sum E Fl end 2should equal press run show Al3703h39106 11 I certify stagrorennO made abum ore correct complete CARL S WFIEE LET Publisher Big Day Arrives Okay now youre ready try signs first time some final thoughts remind ers get field youll find takes 15 minutes assemble full sign decide make up night before flying youll pleased learn complete sign folds neatly shoe box room left lunch sure keep signs dry make sure grass isnt damp lay out fabric would soak up moisture like blotter youd never get off ground Using item start lets make up checklist precautions first few flights 1 Keep signs dry 2 Before takeoff check sign sure connectors secure wind flips sign about check again 3 Do test flying easy stages first word two 4 Keep spectators off side make pass drophook trail ing 5 Make sign lift-offs wind make normal climb-outs 6 During lift-off keep eyes tention plane Dont worry about signit will follow along has no other choice 7 Be prepared drop sign en gine falters especially during lift-off climb-out 8 Maintain performance safety factor never towing sign long cant climb plane altitude 9 Abide field safety rules usual Youll tempted tow sign right over crowd dont End Well thats build em thats tow em hope readers will try because its chal lenging yet useful project Also might want look prospects making club project parcel out work making kit letters qualif several planes pilots towing So last 33 letters Ill close saying TRY TOWING YOUR OWN SIGNSITSALOTTA FUN Lets see now takes 5 Ts 2 Rs 2 Ys 4 0s tographs article made Lee Boozer Jimmy Zeak Chuck Stevens Emilic Fuente Bill Layers members Palm Beach Sky hawks Engine Technique/Jehlik continued page 51 surplus metal ammo box about 14 X 18 X 20 can store running equipment box Tank I prefer round RC klunk tank mounted auto hose clamp screwed top box Tank filler Anything squeeze bulb 92 Model Aviation FLY wITM R95511 eWUR 69tet 0 WALNUT SCALE ASK POE OUR KITS AND ACCESSORIES Al YOUR LOCAL DEALER IF NOT AVAILARLE AT YOUR DEALER ORDER DIRECT ADD 60 POSTAGE BROWN CO-2 ENGINES ENGINES ARE IN STOCK NEW CHARGER AND S SIZES OF TANKS RROWN ENGINES MUST RE ORDERED DIRECT FROM PECK-POLYMERS
Edition: Model Aviation - 1977/12
Page Numbers: 44, 45, 46, 47, 48, 49, 50, 91, 92
HOW WOULD YOU like tow variety signs next fun-fly First might assemble says BOMB DROP EVENT STARTS PROMPTLY AT 9 AM next message rib friends PLEASE REPLACE DI VOT AFTER EACH LANDING later reads DONT FORGET ELECTION NEXT MEETING Does raise lot questions hope because youre interested Id like tell you can make own fieldkit interchangeable letters tow just about sign want Heres project nutshell Youll make up individual characters letters numbers punctuation marks too want simple materials using conventional methods Youll make bridle towline front sign thing called drag back photo 1 Youll install releasable towhook bottom plane servo system operate big day arrives youll select letters need message connect together simply just few minutes youre ready go surprisingly youll find whole rig almost inde structible wont need super-plane tow ing youll find flying easy no big surprises Although novice shouldnt try good Sunday pilot can easily Circling field 50 100 feet sign easy read scale appearance gets attention time Before get details let set stage rest article recommendations based 18 months experience using 19-powered conventional RC model towing signs 12 15 feet long 6h-in-high let ters tow signs comparable ones describe learn towing safe easy steps Im confident youll have success Design Concepts Lets talk first about design requirements sign Obviously should light strong low drag towline towing bridle connecting lines needed make letters follow along order letters need stifleners leading edges theyll keep shapes balance weights bot tom edges sign will trail vertically lay over its side What isnt obvious need something minimize sign flutter know flag flutters breeze Well sign long slender flag would flutter grand scale except four simple things drag aft end tugs sign out straight letters flexible weight kept minimum balance weights used behind last letter sign factors pay off two ways aerodynamic forces expend themselves harmlessly fluttering trailing edges letters drag Reducing weight especially aft end prevents sign playing crack-the-whip normal small amount flutter does oc cur Dont surprised see little flut ter especially aft one-fourth sign real ones too 44 Model Aviation RC Towplane towplane se lect should will take off quickly climb rapidly fly slowly good stability TABLE 1 MATERIALS LIST Fabric polyester-cotton broadcloth Sequins 14 diameter Thread Talon Button & Carpet Extra Strong Bamboo 3/64 1/16 square 8 lengths Monofilament fishing line 4-pound test Lead split-shot weights size 3/0 about 3/16 diameter Swivel-snap size 5 Steel rings 3/8 diameter Releasable towhook EK Logictrol Stock No THR-1 Flexible servo cable braided metal Solder coreless 1/8 diameter Soft iron wire 1/32 diameter 1 The authors towplane high-lift design 580 sq powered veco 19 9/4 prop tows signs up 34 lettersabout 15 ft long Local club has used 25-powered Quick Stick 40-powered Sweet Stick 60-powered Aeromaster flown well below full throttle control have reserve power yond whats needed tow sign may want use lower pitch prop usual improve characteristics What type plane will work Ive pleasantly surprised find RC model can tow heck lot towplane photo 2 conventional high-lift design 580 sq powered standard Veco 19 turning 9/4 prop regularly tows signs up 34 letters length about 15 feet lifts sign off ground no struggle requires less full throttle maintain level flight Ive set limit 34 letters Ill have perform ance safety factor full sign full power can climb slowly up altitude signs have also towed three other planes club did job ease 25-powered QuickStick 40-powered Sweet-Stick 60-powered Aeromaster three slowed down well below full throttle maintain realistic airspeed circled field Sweet-Stick however has flown little faster desirable maintain safe control So can tow sign also drop before landing plane will need re leasable towhook should located bottom fuselage near cen ter gravity possible EK Logic trol hook does excellent job photo 3 shows mockup installation sim ple metal guard added front hook prevents towline falling off hook preparing takeoff light spring also added keep hook locked position until servo releases it How actuate towhook release servo will depend setup plane select ingenuity Since plane uses three channels use throttle servo bringing throttle full idle moves pushrod unlock towhook Towing Sign two methods lifting sign off ground both used LOCATE CONNECTOR LINE ALONG HERE LOCATE CONNECTOR POLE HERE LOCASE CCTITS2TC LINE /16 4 41/4 4 21/32 ASSENBLY BOARD LAYOUT Fig 1 Ij j II II LOCATE CONNECTOR LOOPS AT ONE OF THESE SEVEN DISTANCES SELECT DISTANCE B FROTI TLE 2 FOR THE LETTER BEING ASS~LED ALONG 4 13/16 5 1/in 5 7/16 DISTANCE B 111 1 I I December 1977 45 6 1 ~1 3 An EK releasable hook used towing allows dropping sign before landing three-channel system author used throttle servo release full idle moves pushrod unlock towhook 4 Before takeoff sign stretched out along takeoft path tew teet ott tne sloe ito avoio snagging gear aruurIi e forward connect towhook least 4 feet air passes over front sign steady climb plane will peel sign off ground 4-lb test monofilament line nylon rope pic visibility 36 40 ft long 46 Model Aviation 2 Basic elements sign front end left bridle towline right drag letters interchangeable 5 mockup photo portrays installation towhook b xternaI view ot tne TownooK drophook installation cable drophook drophook used lift sign aerial pickup release drophook clearly visible servos set lock used see text description rather tow takeoff both hooks Balsa spool pic 5 unwinds drophook cord 7 The drophook shaped soft iron wire must have no sharp projections Just enough solder added give little weight positive drop Note hole braided release cable engages old-timers still used today Either way interesting challenge RC pilot because realism both exciting spectators watch first method youll lift sign off ground plane takes off climbs out Start placing plane takeoff position Stretch sign out di rectly along takeoff path front sign nearest plane See photo 4 Connect monofilament towline bridle sign run free end line back plane straight back lays along takeoff path might catch landing gear horizontal stabilizer during takeoff So lay about 3 4 feet off side takeoff path bring around behind plane run up forward con nect towhook long should towline Just long enough plane can take off least 4 feet air passes over front sign steady normal climb As plane continues its climb sign will peel off ground follow along way sign never drags across ground Make towline 4-lb test monofilament tie 3/t-in towring end After gain experi ence youll want towline short good judgment will allow realis tic appearance plane requires 36- 45-ft towline length depends wind affects takeoff Make takeoffs wind sign gets kite-like lift during first few moments lift-off until starts trailing vertically considerably eases bur den towplane After climb-out regulate power airspeed fly slow path around field Use distances Dist WDist D 13/16 13/16 3 1/2 1 3/16 1 1/2 3 7/8 4 1/4 4 1/4 411/16 115/16 2 3/4 4 1/4 4 2 1/32 421/32 4 2 1/32 4 21/32 413/16 5 1/16 5 7/16 characters apostrophe Colon E F J L Space Period comma Dash B D N 0 P Q R U 2356789 T V X Y 4 C G H K S Z $ M W Note All dimensions inches characters except small punctuation marks 6 1/4 high characters have 1 3/16 stroke December 1977 47 8 Rig aerial pickup consists two 8-ft bamboo poles set about eight feet apart Drophook released circling field plane flown about 4 feet above pickup loop top poles Tie scraps bright colored cloth loop drophook visibility TABLE 2 CHARACTER DIMENSIONS nere planeout picture rlgntnas snaggea pickup ioop ax moaerame speea gone high-power climbout sign has begun peel off ground author right concentrates control 4-lb line will break hook something mistake 50 100 feet Fly just fast enough keep sign tugged out straight main tain safe controllable airspeed plane Flying too fast easy will appear unrealistic cause undue sign flutter Since letter flutters like miniature flag continuous high airspeed can eventually damage sign As might expect towing load like plane will fly slower given power setting therefore respond slowly control movements ever because towline attached center gravity plane should have positive control response no unusual flight characteristics speak towing load Im referring drag cre ated sign its weight com plete 30-letter sign including bridle drag weighs about 4 ounces weight little significance Dropping sign simple just actuate towhook release sign will drop gently ground no damage Now have doubts about self plane trying heres safe easy way first few flights tow word get feel system method try two words three etc making several flights stage until towing full sign prepared abort tow time plane sign doesnt have way want Just drop sign think over later time crease load climb up safe altitude check planes performance control response progressing slowly like youll accomplish two things 1 youll develop full confidence yourself plane 2 youll find out long sign plane can safely tow second method lift-off extra equipment required optional requires precise flying dont hesitate try itits fun method youll fly plane over sign pick up trailing drophook Youll need 13 assemble letter parts laid Out shown assembly board layout Use aliphatic glue like Titebond Household Cement Ambroid etc. will curl up fabric make too rigid See text 48 Model Aviation 10 Sign towing has its special language Shown terms will using materials need listed Table 1 11 plentiful supply pre-cut bamboo oriental wall hangings found import shops department stores Other items found fishing tackle counter fabric store hobby shop 12 Preparing materials make character Also see Fig 11 Shown bamboo strips connector pole stiffeners two connector linesbutton carpet thread pieces about 10 long same towhook before youll also need drophook towline release mechanism shown photos 5 6 7 towline run 10-ft length monofila ment through center rectangular balsa spool Tie towring top end drophook bottom end Make drophook soft iron wire has no sharp projections just enough solder give little weight store line flight keep tangling wrap snugly around spool place spool hook hook-housing Put towring towhook set servos secure towhook drophook place prior flight braided throttle cable shown works fine drophook release As before Ill leave design servo action needed release drophook Photo 8 shows rig sign pickup Set up two 8-ft bamboo poles about 8 feet apart Beforehand make small vee-notch tip pole Lay sign out along flight path did first method towing bridle centered between poles make 24-ft monofilament line pickup loop Connect both ends line bridle lay loop formed across top two notched poles Last tie piece bright-colored yarn center loop another piece end drophook make visible Take off release drophook circling field As falls towline will unwind balsa spool until fully extended Since airstream will make trail back angle hook will about 8 feet below plane Guide plane moderate speed fly about 4 feet above center poles Just plane reaches poles apply full throttle establish normal climb did everything right drophook will catch pickup loop sign will gently peel off ground photo 9 didnt can always circle around try again dimensions given total towline will 22 feet long drophook line 10 feet pickup loop stretches out 12 feet length gives realistic appearance longer towline may need takeoff method Now understand sign picked up consider two precautions Use 4-lb test monofilamentif hook something mistake youll glad breaks Dont plant poles too firmly ground Can guess Now can tow sign dont recom mend novice dont think have expert pattern-pilot either best advice can fly plane vice versa can make plane go want what want can tow sign Sign Construction First check terms well using shown photo 10 materials youll need listed Ta ble 1 quantities arent specified since will depend letters tend make fabric store fishing tackle counter favorite hobby shop will supply needs except photo 11 reveals can find plentiful supply pre-cut bam boo oriental wall-hangings can find import shops department stores quality size strips vary somewhat after cull out December1977 49 14 Four steps forming connector end connector pole R Retainer sequins forced over bamboo connector pole shish kebab style Drill hole piece hardwood handy tool 15 character has connector pole front connector loops back Strip bamboo stiffens edge leading edge characterexcept commas etcrequire balance weight bottom 16 same principles applied characters whether letters numerals punctuation marks spaces between char acters nothing two connector lines connector pole 17 towing bridle must rugged because takes full brunt towing load Note strip solder wrapped around bottom bridle connector pole front sign trails vertically rest follows bad ones youll have toughest materials going Use strips about 3/64 1/16-in square slight variations wont hurt Now about shape letters Space wont permit drawing out whole alphabet plenty reference books However recommend using Gothic style letters shown Theyre boxy enough simple make yet have some eye-appeal easy read Also Id like recommend some basic proportions sizes letters will provide weight drag similar have tested Table 2 can see characters except small punctuation marks 6-in high have 1-3/16-in stroke will probably know letters same width spacing between different combinations letters varies give pleasing appearance Table 2 distances W D provided pur pose Once youve designed letters around basic proportions draw out 5 X 8 card can used template punch tiny holes card lines forming letters intersect Lay template fabric line edge card up fabric grain push felt-tipped pen through hole provide points outlining letter As cut letter out handle raw edges care prevent raveling Youll read later prevent finished letter Next youll need prepare simple assembly-board hold pieces let ter place glue together Fig 1 shows lay out piece ply wood Any letters numbers punc tuation marks can assembled scheme difference being locate connector loops establish distance D character making Photo 12 shows next step preparing materials make letter Cut out letter want start select bamboo strips connector pole stiffeners Next prepare two connector lines cut piece button capret thread about 10 long Form connector loop tying snugly around scrap Nyrod tubing slightly smaller diameter se quins used form connector see photo 14 A-in diameter sequins 3/16-in diameter Nyrod works out just right Apply drop glue knot before trimming off excess thread Make sure glue doesnt penetrate loop itself because loop should remain soft limber photos 12 14 can see loops connectors form simple connections between letters con necting letters together 1oop will stretch out oval shape slide over con nector easily sign towed 1oop stretches out tightly remains secure its connector Disassembling letters equally simple suggest make up sample two 1oop connector make sure assemble easily yet secure subjected pull assemble letter lay parts out shown photo 13 Insert pins brads assembly-board establish distance D Table 2 would 4-21/32 number 8 shown being assem bled sure connector lines under slight equal tension apply slender bead blue along joints tween bamboo thread fabric Make sure glue joints complete keep narrow possible letter will remain flexible Use aliphatic glue like Titebond household Ambroid glue will curl up fabric also make too rigid Youll find helpful hold bamboo strips down heavy fishing weights glue dries Next use small paint brush coat Continued page 91 50 Model Aviation 18 An expanding file provides handy storage keeps letters unwrinkled Authors kit contain 106 characters including five commonly used letters assembles sign field 15 minutes must have lost frequency pin club project qualify several pilots airplanes WHEELS RO WHEELS Smooth inflatable wheels big airplanes Features two piece bolt gether hubs hub caps Wheels can inflated deflated thru tiny valve side tire pressure de sire Truly remark able realistic looking wheel I$795 Pair 450R4-1 /2 Diameter995 Pair SOOR 5 Diameter11 95 Pair 550R5-1 /2 Diameter1 395 Pair 600R ameter1 595 Pair Low bounce shock absorbing wheels featuring 6 spoke dura hub finest quality hand inspected 175Tor RWheels 1-3/4$219 Pair 200 T RWheels 2239 Pair 225 T R SWheels 2-1/4259 Pair 250 T R SWheels 2-1/2279 Pair 275 T R 5Wheels 2-3/4299 Pair 300 T R 5Wheels 3319 Pair 325 T RWheels 3-1 /4339 Pair 350 T RWheels 3-1/2359 Pair DUBRO PRODUCTS INCORPORATED 480 BONNER ROAD WAUCONDA ILL 60084 total duration 75623 Fortunately FAI Sporting Code states explicitly required seaplanes land water So new record record-setting plane tree top Glenn Scillian went get help friends area spied ropes holding up canopy ropes hatchet John Tallmans car plunged through poison ivy base plane-eating tree climbed tree attacked offending branches After long exhausting work Shark fell stages ground delighted find damage minimal Lots fuel left later measure ment showed 35 fi oz 42% origi nal fuel remained tanks enough additional 5 hours same rate fuel usage longer leaner mixture ligher model ever records made actual rather potential performance Surpassing German record 25% quite satis fying result Special thanks order official witnesses some took day va cation leave help Friday lake busy Particular recognition due invisible Kenny Greenhouse Long ago Kenny assigned role documenting record attempts camera have never picture record articles Thanks also Dean Smith Lee Shiflett supplied critical parts flight Record setting exciting re warding activity doesnt require weekly travel follow contest circuit yet can compete entire world Opti mizing element modelair frame engine fuel system other componentsis necessary succeed Originality needed since wont find standardized approaches seen nor mal competition Free flight neglected area USA has 27 outdoor free flight records nearly held eastern European countries Control line radio control also have room improved performances Lets get going Tow Signs/Layers continued page 50 remaining raw fabric edges aliphatic glue has thinned 50-50 water Coat just /8-in margin fab ric will effectively stop edges raveling yet leave letter flexi ble After glue dry remove letter board trim off excess thread rough fabric edges part stiffener extends beyond edge letter Leave connector pole extra long now Photo 14 shows steps forming connector end connector pole Notice letters square front corners must have fabric cut out slight ly area Slip two sequins place leaving 1/16 3/32 between Although hole sequins small can forced over bamboo easily shish kebab style scrap ply wood hole makes fine tool push trim off bamboo leaving about 1/32 projecting form good glue joint Now glue sequins place epoxy sure form complete fillet epoxy between bamboo sequin surfaces As form inboard fillet let epoxy cover joint between connector line thread connector pole reinforcement junction pole sequins thread must good strong since entire towing load concentrated point last step letter finished Slide split-shot weight place photo 14 squeeze tightly fastened over both connector line thread fabric Youll have trim fabric edge back little get weight right position shapes other characters vary illustrated construc tion principles same charac ter has connector pole front connector loops back strip bamboo stiffens edge lead ing edge character needs balance December1977 91 WHOLE NEW LINE OF SMOOTH INFLATABLE BIG WHEELS 4 4Y 5 51h& 6 TREAD T SMOOTH R SLICKS 5 2 KITS e PLANS ACCESSORIES 1417 ME 17W SPAN STOCK NO PP 15 KIT $425 4 WALNUT SCALE KITS RART ACE$425 PEANUT SCALE KITS J3 CUE$329 PIREENPOL$329 MILES$329 TURRULENT$329 MUSTANG$349 ZERO$349 COUGAR$349 AIIIDREASOId$349 GIPSY MOTH$349 GANAGORIE$349 SPORT MODEL KITS ONE NITE 28$475 ONE NITE 16$349 STRINGLESS WONDER$249 PEcK ROD$139 KITS 0 PLANS S ACCESSORIES REAL JAPANESE TISSUEPROPS COMPLETE CATALOG 50 MANY HARD TO FIND ITEMS pP 0 BOX 2498 -AMALA MESA CAUF 92041 WPHONE 7141 4694675 17141 4424636 weight except very light ones such letter comma space Look over various photos especially photos 15 16 youll see principles applied entire alpha bet numbers punctuation marks Youll see too space nothing two connector lines connector pole Making letter takes little time reading about making lots sounds tedious lay out Fig 1 pattern ten places sheet plywood can assembly-line project making several time simplicity drag shown photo 17 assembly methods same four fingers formed cut ting slits drag better job re ducing flutter solid piece fabric Incidentally Ive tried variety drag de signs including U-shaped type used real signs Although shown doesnt provide scale appearance does best job sure coat raw fabric edges thinned-out glue dont put bal ance weight drag towing bridle also shown photo 17 must rugged because takes full brunt towing load Use monofila ment bridle rather thread use heavier bamboo dowel about 3/32 diameter pole Tie monofil ament swivel-snap 2 di mension wont change tie end pole After can form connector loops about 1 hind pole Epoxy monofilament pole epoxy knots too Wrap 4 inches A-in solder around bottom pole balance weight get front sign trail verti cally rest sign inclined same Now letters numbers punctuation marks will need Heres easy way find own answer Plan first sign message youll want tow regularly Mine read JOIN THE PALM BEACH SKYHAWKS TODAY provides beginning letter inventory lets start fly ing soon possible invent new messages tow build addi tional characters need way can build inventory over long period time yet enjoy towing signs youre doing field kit photo 18 contains 106 characters has five commonly used letters fewer others expanding file shown provides handy storage keeps letters un wrinkled Come think have 107 last Santa-in-a-sleigh towed front Merry Christmas sign suggest keep written inventory characters have time plan message can check quickly see have enough As Ns Ts etc make plan sign find lack certain letters complete stop think slight rewording might put idea across letters have STATEMENT OF OWNERS*41P MANAGEMENT AND CIRCULATION Rrqojred 39 USC 3683 1 TeIeoIPc6lisssion MODELAVIATION A PaIIuetofl No. 067930 2 Date ol Filing Sepseonben 13 1577 3 Frequency 01 sue Monthly A No01 Sues Publtehed Annually 12 8 Annual Sattcnipnon Prico Sn20G 4 Location 01 known OlIton 01 putaication street city county stale ZIP code pnnnnrsl 815 FIteenttn Sn NW Weahiognon DC 2008h 5 Location headquarters aecerel business offices publishers Non printers 815 Fitneensh St. NW Weshinston DC 211015 6 Names connplens addrinses Publisher Editor Monesins Editor PutnlelnOr Gel S Whenlen 015 Fjtteanth Sn. NW Washinason DC 20605 Editor Wlliaen 3 Winner 8th Ftneennh Sn. NW Wsshington DC 20006 Managing Edsor NONE 7Owner Acscssecyol Model Aeronautios81h Fmfttenth Sn. NW Washington DC 206155 8Know bondltolders wor69gees Other tacOriny holders owning hold jog n% went total amount 01 bonds orornns Othpr securities NONE S For coenpienmon nonptotit organicotions authorized snail spocial rates Igoonror 132n22 PSMI Tbn purpose lunction end nonprolit status nhs orOenjeeton tuempn status Icr Foderal incowe too ponprees ham non changed during preceding 12 moonhe Ecoent cod Nalorr Cnculation nIl Actual Acerageno copies no copies01 tiOgir eachissueissue duriogoublished prenadingnearest l2nlectheillingdane ATotal No COpes Printed Net Press Ron3703530106 BPard Ciroulation 1 Sales lhruuoh Dealers end Carriers SIrens Veodurs end Counter Sales23742306 2Mail Subtonrytross2911732d1S CTotal Paid Circulanmoo31 49135211 0Frco Djsgnibullun Mel Carrier Other Meaos Samylns Complmennary Other Finn Copres360621 30 ETotal Distribution Suns C cod Dl3517737341 FCopies No Dtnributerl 1Oltise Usc LOttOmr Unacoocoted Seciled eltor Printing10691750 2Returns row New Agente UTotal Sum E Fl end 2should equal press run show Al3703h39106 11 I certify stagrorennO made abum ore correct complete CARL S WFIEE LET Publisher Big Day Arrives Okay now youre ready try signs first time some final thoughts remind ers get field youll find takes 15 minutes assemble full sign decide make up night before flying youll pleased learn complete sign folds neatly shoe box room left lunch sure keep signs dry make sure grass isnt damp lay out fabric would soak up moisture like blotter youd never get off ground Using item start lets make up checklist precautions first few flights 1 Keep signs dry 2 Before takeoff check sign sure connectors secure wind flips sign about check again 3 Do test flying easy stages first word two 4 Keep spectators off side make pass drophook trail ing 5 Make sign lift-offs wind make normal climb-outs 6 During lift-off keep eyes tention plane Dont worry about signit will follow along has no other choice 7 Be prepared drop sign en gine falters especially during lift-off climb-out 8 Maintain performance safety factor never towing sign long cant climb plane altitude 9 Abide field safety rules usual Youll tempted tow sign right over crowd dont End Well thats build em thats tow em hope readers will try because its chal lenging yet useful project Also might want look prospects making club project parcel out work making kit letters qualif several planes pilots towing So last 33 letters Ill close saying TRY TOWING YOUR OWN SIGNSITSALOTTA FUN Lets see now takes 5 Ts 2 Rs 2 Ys 4 0s tographs article made Lee Boozer Jimmy Zeak Chuck Stevens Emilic Fuente Bill Layers members Palm Beach Sky hawks Engine Technique/Jehlik continued page 51 surplus metal ammo box about 14 X 18 X 20 can store running equipment box Tank I prefer round RC klunk tank mounted auto hose clamp screwed top box Tank filler Anything squeeze bulb 92 Model Aviation FLY wITM R95511 eWUR 69tet 0 WALNUT SCALE ASK POE OUR KITS AND ACCESSORIES Al YOUR LOCAL DEALER IF NOT AVAILARLE AT YOUR DEALER ORDER DIRECT ADD 60 POSTAGE BROWN CO-2 ENGINES ENGINES ARE IN STOCK NEW CHARGER AND S SIZES OF TANKS RROWN ENGINES MUST RE ORDERED DIRECT FROM PECK-POLYMERS
Edition: Model Aviation - 1977/12
Page Numbers: 44, 45, 46, 47, 48, 49, 50, 91, 92
HOW WOULD YOU like tow variety signs next fun-fly First might assemble says BOMB DROP EVENT STARTS PROMPTLY AT 9 AM next message rib friends PLEASE REPLACE DI VOT AFTER EACH LANDING later reads DONT FORGET ELECTION NEXT MEETING Does raise lot questions hope because youre interested Id like tell you can make own fieldkit interchangeable letters tow just about sign want Heres project nutshell Youll make up individual characters letters numbers punctuation marks too want simple materials using conventional methods Youll make bridle towline front sign thing called drag back photo 1 Youll install releasable towhook bottom plane servo system operate big day arrives youll select letters need message connect together simply just few minutes youre ready go surprisingly youll find whole rig almost inde structible wont need super-plane tow ing youll find flying easy no big surprises Although novice shouldnt try good Sunday pilot can easily Circling field 50 100 feet sign easy read scale appearance gets attention time Before get details let set stage rest article recommendations based 18 months experience using 19-powered conventional RC model towing signs 12 15 feet long 6h-in-high let ters tow signs comparable ones describe learn towing safe easy steps Im confident youll have success Design Concepts Lets talk first about design requirements sign Obviously should light strong low drag towline towing bridle connecting lines needed make letters follow along order letters need stifleners leading edges theyll keep shapes balance weights bot tom edges sign will trail vertically lay over its side What isnt obvious need something minimize sign flutter know flag flutters breeze Well sign long slender flag would flutter grand scale except four simple things drag aft end tugs sign out straight letters flexible weight kept minimum balance weights used behind last letter sign factors pay off two ways aerodynamic forces expend themselves harmlessly fluttering trailing edges letters drag Reducing weight especially aft end prevents sign playing crack-the-whip normal small amount flutter does oc cur Dont surprised see little flut ter especially aft one-fourth sign real ones too 44 Model Aviation RC Towplane towplane se lect should will take off quickly climb rapidly fly slowly good stability TABLE 1 MATERIALS LIST Fabric polyester-cotton broadcloth Sequins 14 diameter Thread Talon Button & Carpet Extra Strong Bamboo 3/64 1/16 square 8 lengths Monofilament fishing line 4-pound test Lead split-shot weights size 3/0 about 3/16 diameter Swivel-snap size 5 Steel rings 3/8 diameter Releasable towhook EK Logictrol Stock No THR-1 Flexible servo cable braided metal Solder coreless 1/8 diameter Soft iron wire 1/32 diameter 1 The authors towplane high-lift design 580 sq powered veco 19 9/4 prop tows signs up 34 lettersabout 15 ft long Local club has used 25-powered Quick Stick 40-powered Sweet Stick 60-powered Aeromaster flown well below full throttle control have reserve power yond whats needed tow sign may want use lower pitch prop usual improve characteristics What type plane will work Ive pleasantly surprised find RC model can tow heck lot towplane photo 2 conventional high-lift design 580 sq powered standard Veco 19 turning 9/4 prop regularly tows signs up 34 letters length about 15 feet lifts sign off ground no struggle requires less full throttle maintain level flight Ive set limit 34 letters Ill have perform ance safety factor full sign full power can climb slowly up altitude signs have also towed three other planes club did job ease 25-powered QuickStick 40-powered Sweet-Stick 60-powered Aeromaster three slowed down well below full throttle maintain realistic airspeed circled field Sweet-Stick however has flown little faster desirable maintain safe control So can tow sign also drop before landing plane will need re leasable towhook should located bottom fuselage near cen ter gravity possible EK Logic trol hook does excellent job photo 3 shows mockup installation sim ple metal guard added front hook prevents towline falling off hook preparing takeoff light spring also added keep hook locked position until servo releases it How actuate towhook release servo will depend setup plane select ingenuity Since plane uses three channels use throttle servo bringing throttle full idle moves pushrod unlock towhook Towing Sign two methods lifting sign off ground both used LOCATE CONNECTOR LINE ALONG HERE LOCATE CONNECTOR POLE HERE LOCASE CCTITS2TC LINE /16 4 41/4 4 21/32 ASSENBLY BOARD LAYOUT Fig 1 Ij j II II LOCATE CONNECTOR LOOPS AT ONE OF THESE SEVEN DISTANCES SELECT DISTANCE B FROTI TLE 2 FOR THE LETTER BEING ASS~LED ALONG 4 13/16 5 1/in 5 7/16 DISTANCE B 111 1 I I December 1977 45 6 1 ~1 3 An EK releasable hook used towing allows dropping sign before landing three-channel system author used throttle servo release full idle moves pushrod unlock towhook 4 Before takeoff sign stretched out along takeoft path tew teet ott tne sloe ito avoio snagging gear aruurIi e forward connect towhook least 4 feet air passes over front sign steady climb plane will peel sign off ground 4-lb test monofilament line nylon rope pic visibility 36 40 ft long 46 Model Aviation 2 Basic elements sign front end left bridle towline right drag letters interchangeable 5 mockup photo portrays installation towhook b xternaI view ot tne TownooK drophook installation cable drophook drophook used lift sign aerial pickup release drophook clearly visible servos set lock used see text description rather tow takeoff both hooks Balsa spool pic 5 unwinds drophook cord 7 The drophook shaped soft iron wire must have no sharp projections Just enough solder added give little weight positive drop Note hole braided release cable engages old-timers still used today Either way interesting challenge RC pilot because realism both exciting spectators watch first method youll lift sign off ground plane takes off climbs out Start placing plane takeoff position Stretch sign out di rectly along takeoff path front sign nearest plane See photo 4 Connect monofilament towline bridle sign run free end line back plane straight back lays along takeoff path might catch landing gear horizontal stabilizer during takeoff So lay about 3 4 feet off side takeoff path bring around behind plane run up forward con nect towhook long should towline Just long enough plane can take off least 4 feet air passes over front sign steady normal climb As plane continues its climb sign will peel off ground follow along way sign never drags across ground Make towline 4-lb test monofilament tie 3/t-in towring end After gain experi ence youll want towline short good judgment will allow realis tic appearance plane requires 36- 45-ft towline length depends wind affects takeoff Make takeoffs wind sign gets kite-like lift during first few moments lift-off until starts trailing vertically considerably eases bur den towplane After climb-out regulate power airspeed fly slow path around field Use distances Dist WDist D 13/16 13/16 3 1/2 1 3/16 1 1/2 3 7/8 4 1/4 4 1/4 411/16 115/16 2 3/4 4 1/4 4 2 1/32 421/32 4 2 1/32 4 21/32 413/16 5 1/16 5 7/16 characters apostrophe Colon E F J L Space Period comma Dash B D N 0 P Q R U 2356789 T V X Y 4 C G H K S Z $ M W Note All dimensions inches characters except small punctuation marks 6 1/4 high characters have 1 3/16 stroke December 1977 47 8 Rig aerial pickup consists two 8-ft bamboo poles set about eight feet apart Drophook released circling field plane flown about 4 feet above pickup loop top poles Tie scraps bright colored cloth loop drophook visibility TABLE 2 CHARACTER DIMENSIONS nere planeout picture rlgntnas snaggea pickup ioop ax moaerame speea gone high-power climbout sign has begun peel off ground author right concentrates control 4-lb line will break hook something mistake 50 100 feet Fly just fast enough keep sign tugged out straight main tain safe controllable airspeed plane Flying too fast easy will appear unrealistic cause undue sign flutter Since letter flutters like miniature flag continuous high airspeed can eventually damage sign As might expect towing load like plane will fly slower given power setting therefore respond slowly control movements ever because towline attached center gravity plane should have positive control response no unusual flight characteristics speak towing load Im referring drag cre ated sign its weight com plete 30-letter sign including bridle drag weighs about 4 ounces weight little significance Dropping sign simple just actuate towhook release sign will drop gently ground no damage Now have doubts about self plane trying heres safe easy way first few flights tow word get feel system method try two words three etc making several flights stage until towing full sign prepared abort tow time plane sign doesnt have way want Just drop sign think over later time crease load climb up safe altitude check planes performance control response progressing slowly like youll accomplish two things 1 youll develop full confidence yourself plane 2 youll find out long sign plane can safely tow second method lift-off extra equipment required optional requires precise flying dont hesitate try itits fun method youll fly plane over sign pick up trailing drophook Youll need 13 assemble letter parts laid Out shown assembly board layout Use aliphatic glue like Titebond Household Cement Ambroid etc. will curl up fabric make too rigid See text 48 Model Aviation 10 Sign towing has its special language Shown terms will using materials need listed Table 1 11 plentiful supply pre-cut bamboo oriental wall hangings found import shops department stores Other items found fishing tackle counter fabric store hobby shop 12 Preparing materials make character Also see Fig 11 Shown bamboo strips connector pole stiffeners two connector linesbutton carpet thread pieces about 10 long same towhook before youll also need drophook towline release mechanism shown photos 5 6 7 towline run 10-ft length monofila ment through center rectangular balsa spool Tie towring top end drophook bottom end Make drophook soft iron wire has no sharp projections just enough solder give little weight store line flight keep tangling wrap snugly around spool place spool hook hook-housing Put towring towhook set servos secure towhook drophook place prior flight braided throttle cable shown works fine drophook release As before Ill leave design servo action needed release drophook Photo 8 shows rig sign pickup Set up two 8-ft bamboo poles about 8 feet apart Beforehand make small vee-notch tip pole Lay sign out along flight path did first method towing bridle centered between poles make 24-ft monofilament line pickup loop Connect both ends line bridle lay loop formed across top two notched poles Last tie piece bright-colored yarn center loop another piece end drophook make visible Take off release drophook circling field As falls towline will unwind balsa spool until fully extended Since airstream will make trail back angle hook will about 8 feet below plane Guide plane moderate speed fly about 4 feet above center poles Just plane reaches poles apply full throttle establish normal climb did everything right drophook will catch pickup loop sign will gently peel off ground photo 9 didnt can always circle around try again dimensions given total towline will 22 feet long drophook line 10 feet pickup loop stretches out 12 feet length gives realistic appearance longer towline may need takeoff method Now understand sign picked up consider two precautions Use 4-lb test monofilamentif hook something mistake youll glad breaks Dont plant poles too firmly ground Can guess Now can tow sign dont recom mend novice dont think have expert pattern-pilot either best advice can fly plane vice versa can make plane go want what want can tow sign Sign Construction First check terms well using shown photo 10 materials youll need listed Ta ble 1 quantities arent specified since will depend letters tend make fabric store fishing tackle counter favorite hobby shop will supply needs except photo 11 reveals can find plentiful supply pre-cut bam boo oriental wall-hangings can find import shops department stores quality size strips vary somewhat after cull out December1977 49 14 Four steps forming connector end connector pole R Retainer sequins forced over bamboo connector pole shish kebab style Drill hole piece hardwood handy tool 15 character has connector pole front connector loops back Strip bamboo stiffens edge leading edge characterexcept commas etcrequire balance weight bottom 16 same principles applied characters whether letters numerals punctuation marks spaces between char acters nothing two connector lines connector pole 17 towing bridle must rugged because takes full brunt towing load Note strip solder wrapped around bottom bridle connector pole front sign trails vertically rest follows bad ones youll have toughest materials going Use strips about 3/64 1/16-in square slight variations wont hurt Now about shape letters Space wont permit drawing out whole alphabet plenty reference books However recommend using Gothic style letters shown Theyre boxy enough simple make yet have some eye-appeal easy read Also Id like recommend some basic proportions sizes letters will provide weight drag similar have tested Table 2 can see characters except small punctuation marks 6-in high have 1-3/16-in stroke will probably know letters same width spacing between different combinations letters varies give pleasing appearance Table 2 distances W D provided pur pose Once youve designed letters around basic proportions draw out 5 X 8 card can used template punch tiny holes card lines forming letters intersect Lay template fabric line edge card up fabric grain push felt-tipped pen through hole provide points outlining letter As cut letter out handle raw edges care prevent raveling Youll read later prevent finished letter Next youll need prepare simple assembly-board hold pieces let ter place glue together Fig 1 shows lay out piece ply wood Any letters numbers punc tuation marks can assembled scheme difference being locate connector loops establish distance D character making Photo 12 shows next step preparing materials make letter Cut out letter want start select bamboo strips connector pole stiffeners Next prepare two connector lines cut piece button capret thread about 10 long Form connector loop tying snugly around scrap Nyrod tubing slightly smaller diameter se quins used form connector see photo 14 A-in diameter sequins 3/16-in diameter Nyrod works out just right Apply drop glue knot before trimming off excess thread Make sure glue doesnt penetrate loop itself because loop should remain soft limber photos 12 14 can see loops connectors form simple connections between letters con necting letters together 1oop will stretch out oval shape slide over con nector easily sign towed 1oop stretches out tightly remains secure its connector Disassembling letters equally simple suggest make up sample two 1oop connector make sure assemble easily yet secure subjected pull assemble letter lay parts out shown photo 13 Insert pins brads assembly-board establish distance D Table 2 would 4-21/32 number 8 shown being assem bled sure connector lines under slight equal tension apply slender bead blue along joints tween bamboo thread fabric Make sure glue joints complete keep narrow possible letter will remain flexible Use aliphatic glue like Titebond household Ambroid glue will curl up fabric also make too rigid Youll find helpful hold bamboo strips down heavy fishing weights glue dries Next use small paint brush coat Continued page 91 50 Model Aviation 18 An expanding file provides handy storage keeps letters unwrinkled Authors kit contain 106 characters including five commonly used letters assembles sign field 15 minutes must have lost frequency pin club project qualify several pilots airplanes WHEELS RO WHEELS Smooth inflatable wheels big airplanes Features two piece bolt gether hubs hub caps Wheels can inflated deflated thru tiny valve side tire pressure de sire Truly remark able realistic looking wheel I$795 Pair 450R4-1 /2 Diameter995 Pair SOOR 5 Diameter11 95 Pair 550R5-1 /2 Diameter1 395 Pair 600R ameter1 595 Pair Low bounce shock absorbing wheels featuring 6 spoke dura hub finest quality hand inspected 175Tor RWheels 1-3/4$219 Pair 200 T RWheels 2239 Pair 225 T R SWheels 2-1/4259 Pair 250 T R SWheels 2-1/2279 Pair 275 T R 5Wheels 2-3/4299 Pair 300 T R 5Wheels 3319 Pair 325 T RWheels 3-1 /4339 Pair 350 T RWheels 3-1/2359 Pair DUBRO PRODUCTS INCORPORATED 480 BONNER ROAD WAUCONDA ILL 60084 total duration 75623 Fortunately FAI Sporting Code states explicitly required seaplanes land water So new record record-setting plane tree top Glenn Scillian went get help friends area spied ropes holding up canopy ropes hatchet John Tallmans car plunged through poison ivy base plane-eating tree climbed tree attacked offending branches After long exhausting work Shark fell stages ground delighted find damage minimal Lots fuel left later measure ment showed 35 fi oz 42% origi nal fuel remained tanks enough additional 5 hours same rate fuel usage longer leaner mixture ligher model ever records made actual rather potential performance Surpassing German record 25% quite satis fying result Special thanks order official witnesses some took day va cation leave help Friday lake busy Particular recognition due invisible Kenny Greenhouse Long ago Kenny assigned role documenting record attempts camera have never picture record articles Thanks also Dean Smith Lee Shiflett supplied critical parts flight Record setting exciting re warding activity doesnt require weekly travel follow contest circuit yet can compete entire world Opti mizing element modelair frame engine fuel system other componentsis necessary succeed Originality needed since wont find standardized approaches seen nor mal competition Free flight neglected area USA has 27 outdoor free flight records nearly held eastern European countries Control line radio control also have room improved performances Lets get going Tow Signs/Layers continued page 50 remaining raw fabric edges aliphatic glue has thinned 50-50 water Coat just /8-in margin fab ric will effectively stop edges raveling yet leave letter flexi ble After glue dry remove letter board trim off excess thread rough fabric edges part stiffener extends beyond edge letter Leave connector pole extra long now Photo 14 shows steps forming connector end connector pole Notice letters square front corners must have fabric cut out slight ly area Slip two sequins place leaving 1/16 3/32 between Although hole sequins small can forced over bamboo easily shish kebab style scrap ply wood hole makes fine tool push trim off bamboo leaving about 1/32 projecting form good glue joint Now glue sequins place epoxy sure form complete fillet epoxy between bamboo sequin surfaces As form inboard fillet let epoxy cover joint between connector line thread connector pole reinforcement junction pole sequins thread must good strong since entire towing load concentrated point last step letter finished Slide split-shot weight place photo 14 squeeze tightly fastened over both connector line thread fabric Youll have trim fabric edge back little get weight right position shapes other characters vary illustrated construc tion principles same charac ter has connector pole front connector loops back strip bamboo stiffens edge lead ing edge character needs balance December1977 91 WHOLE NEW LINE OF SMOOTH INFLATABLE BIG WHEELS 4 4Y 5 51h& 6 TREAD T SMOOTH R SLICKS 5 2 KITS e PLANS ACCESSORIES 1417 ME 17W SPAN STOCK NO PP 15 KIT $425 4 WALNUT SCALE KITS RART ACE$425 PEANUT SCALE KITS J3 CUE$329 PIREENPOL$329 MILES$329 TURRULENT$329 MUSTANG$349 ZERO$349 COUGAR$349 AIIIDREASOId$349 GIPSY MOTH$349 GANAGORIE$349 SPORT MODEL KITS ONE NITE 28$475 ONE NITE 16$349 STRINGLESS WONDER$249 PEcK ROD$139 KITS 0 PLANS S ACCESSORIES REAL JAPANESE TISSUEPROPS COMPLETE CATALOG 50 MANY HARD TO FIND ITEMS pP 0 BOX 2498 -AMALA MESA CAUF 92041 WPHONE 7141 4694675 17141 4424636 weight except very light ones such letter comma space Look over various photos especially photos 15 16 youll see principles applied entire alpha bet numbers punctuation marks Youll see too space nothing two connector lines connector pole Making letter takes little time reading about making lots sounds tedious lay out Fig 1 pattern ten places sheet plywood can assembly-line project making several time simplicity drag shown photo 17 assembly methods same four fingers formed cut ting slits drag better job re ducing flutter solid piece fabric Incidentally Ive tried variety drag de signs including U-shaped type used real signs Although shown doesnt provide scale appearance does best job sure coat raw fabric edges thinned-out glue dont put bal ance weight drag towing bridle also shown photo 17 must rugged because takes full brunt towing load Use monofila ment bridle rather thread use heavier bamboo dowel about 3/32 diameter pole Tie monofil ament swivel-snap 2 di mension wont change tie end pole After can form connector loops about 1 hind pole Epoxy monofilament pole epoxy knots too Wrap 4 inches A-in solder around bottom pole balance weight get front sign trail verti cally rest sign inclined same Now letters numbers punctuation marks will need Heres easy way find own answer Plan first sign message youll want tow regularly Mine read JOIN THE PALM BEACH SKYHAWKS TODAY provides beginning letter inventory lets start fly ing soon possible invent new messages tow build addi tional characters need way can build inventory over long period time yet enjoy towing signs youre doing field kit photo 18 contains 106 characters has five commonly used letters fewer others expanding file shown provides handy storage keeps letters un wrinkled Come think have 107 last Santa-in-a-sleigh towed front Merry Christmas sign suggest keep written inventory characters have time plan message can check quickly see have enough As Ns Ts etc make plan sign find lack certain letters complete stop think slight rewording might put idea across letters have STATEMENT OF OWNERS*41P MANAGEMENT AND CIRCULATION Rrqojred 39 USC 3683 1 TeIeoIPc6lisssion MODELAVIATION A PaIIuetofl No. 067930 2 Date ol Filing Sepseonben 13 1577 3 Frequency 01 sue Monthly A No01 Sues Publtehed Annually 12 8 Annual Sattcnipnon Prico Sn20G 4 Location 01 known OlIton 01 putaication street city county stale ZIP code pnnnnrsl 815 FIteenttn Sn NW Weahiognon DC 2008h 5 Location headquarters aecerel business offices publishers Non printers 815 Fitneensh St. NW Weshinston DC 211015 6 Names connplens addrinses Publisher Editor Monesins Editor PutnlelnOr Gel S Whenlen 015 Fjtteanth Sn. NW Washinason DC 20605 Editor Wlliaen 3 Winner 8th Ftneennh Sn. NW Wsshington DC 20006 Managing Edsor NONE 7Owner Acscssecyol Model Aeronautios81h Fmfttenth Sn. NW Washington DC 206155 8Know bondltolders wor69gees Other tacOriny holders owning hold jog n% went total amount 01 bonds orornns Othpr securities NONE S For coenpienmon nonptotit organicotions authorized snail spocial rates Igoonror 132n22 PSMI Tbn purpose lunction end nonprolit status nhs orOenjeeton tuempn status Icr Foderal incowe too ponprees ham non changed during preceding 12 moonhe Ecoent cod Nalorr Cnculation nIl Actual Acerageno copies no copies01 tiOgir eachissueissue duriogoublished prenadingnearest l2nlectheillingdane ATotal No COpes Printed Net Press Ron3703530106 BPard Ciroulation 1 Sales lhruuoh Dealers end Carriers SIrens Veodurs end Counter Sales23742306 2Mail Subtonrytross2911732d1S CTotal Paid Circulanmoo31 49135211 0Frco Djsgnibullun Mel Carrier Other Meaos Samylns Complmennary Other Finn Copres360621 30 ETotal Distribution Suns C cod Dl3517737341 FCopies No Dtnributerl 1Oltise Usc LOttOmr Unacoocoted Seciled eltor Printing10691750 2Returns row New Agente UTotal Sum E Fl end 2should equal press run show Al3703h39106 11 I certify stagrorennO made abum ore correct complete CARL S WFIEE LET Publisher Big Day Arrives Okay now youre ready try signs first time some final thoughts remind ers get field youll find takes 15 minutes assemble full sign decide make up night before flying youll pleased learn complete sign folds neatly shoe box room left lunch sure keep signs dry make sure grass isnt damp lay out fabric would soak up moisture like blotter youd never get off ground Using item start lets make up checklist precautions first few flights 1 Keep signs dry 2 Before takeoff check sign sure connectors secure wind flips sign about check again 3 Do test flying easy stages first word two 4 Keep spectators off side make pass drophook trail ing 5 Make sign lift-offs wind make normal climb-outs 6 During lift-off keep eyes tention plane Dont worry about signit will follow along has no other choice 7 Be prepared drop sign en gine falters especially during lift-off climb-out 8 Maintain performance safety factor never towing sign long cant climb plane altitude 9 Abide field safety rules usual Youll tempted tow sign right over crowd dont End Well thats build em thats tow em hope readers will try because its chal lenging yet useful project Also might want look prospects making club project parcel out work making kit letters qualif several planes pilots towing So last 33 letters Ill close saying TRY TOWING YOUR OWN SIGNSITSALOTTA FUN Lets see now takes 5 Ts 2 Rs 2 Ys 4 0s tographs article made Lee Boozer Jimmy Zeak Chuck Stevens Emilic Fuente Bill Layers members Palm Beach Sky hawks Engine Technique/Jehlik continued page 51 surplus metal ammo box about 14 X 18 X 20 can store running equipment box Tank I prefer round RC klunk tank mounted auto hose clamp screwed top box Tank filler Anything squeeze bulb 92 Model Aviation FLY wITM R95511 eWUR 69tet 0 WALNUT SCALE ASK POE OUR KITS AND ACCESSORIES Al YOUR LOCAL DEALER IF NOT AVAILARLE AT YOUR DEALER ORDER DIRECT ADD 60 POSTAGE BROWN CO-2 ENGINES ENGINES ARE IN STOCK NEW CHARGER AND S SIZES OF TANKS RROWN ENGINES MUST RE ORDERED DIRECT FROM PECK-POLYMERS
Edition: Model Aviation - 1977/12
Page Numbers: 44, 45, 46, 47, 48, 49, 50, 91, 92
HOW WOULD YOU like tow variety signs next fun-fly First might assemble says BOMB DROP EVENT STARTS PROMPTLY AT 9 AM next message rib friends PLEASE REPLACE DI VOT AFTER EACH LANDING later reads DONT FORGET ELECTION NEXT MEETING Does raise lot questions hope because youre interested Id like tell you can make own fieldkit interchangeable letters tow just about sign want Heres project nutshell Youll make up individual characters letters numbers punctuation marks too want simple materials using conventional methods Youll make bridle towline front sign thing called drag back photo 1 Youll install releasable towhook bottom plane servo system operate big day arrives youll select letters need message connect together simply just few minutes youre ready go surprisingly youll find whole rig almost inde structible wont need super-plane tow ing youll find flying easy no big surprises Although novice shouldnt try good Sunday pilot can easily Circling field 50 100 feet sign easy read scale appearance gets attention time Before get details let set stage rest article recommendations based 18 months experience using 19-powered conventional RC model towing signs 12 15 feet long 6h-in-high let ters tow signs comparable ones describe learn towing safe easy steps Im confident youll have success Design Concepts Lets talk first about design requirements sign Obviously should light strong low drag towline towing bridle connecting lines needed make letters follow along order letters need stifleners leading edges theyll keep shapes balance weights bot tom edges sign will trail vertically lay over its side What isnt obvious need something minimize sign flutter know flag flutters breeze Well sign long slender flag would flutter grand scale except four simple things drag aft end tugs sign out straight letters flexible weight kept minimum balance weights used behind last letter sign factors pay off two ways aerodynamic forces expend themselves harmlessly fluttering trailing edges letters drag Reducing weight especially aft end prevents sign playing crack-the-whip normal small amount flutter does oc cur Dont surprised see little flut ter especially aft one-fourth sign real ones too 44 Model Aviation RC Towplane towplane se lect should will take off quickly climb rapidly fly slowly good stability TABLE 1 MATERIALS LIST Fabric polyester-cotton broadcloth Sequins 14 diameter Thread Talon Button & Carpet Extra Strong Bamboo 3/64 1/16 square 8 lengths Monofilament fishing line 4-pound test Lead split-shot weights size 3/0 about 3/16 diameter Swivel-snap size 5 Steel rings 3/8 diameter Releasable towhook EK Logictrol Stock No THR-1 Flexible servo cable braided metal Solder coreless 1/8 diameter Soft iron wire 1/32 diameter 1 The authors towplane high-lift design 580 sq powered veco 19 9/4 prop tows signs up 34 lettersabout 15 ft long Local club has used 25-powered Quick Stick 40-powered Sweet Stick 60-powered Aeromaster flown well below full throttle control have reserve power yond whats needed tow sign may want use lower pitch prop usual improve characteristics What type plane will work Ive pleasantly surprised find RC model can tow heck lot towplane photo 2 conventional high-lift design 580 sq powered standard Veco 19 turning 9/4 prop regularly tows signs up 34 letters length about 15 feet lifts sign off ground no struggle requires less full throttle maintain level flight Ive set limit 34 letters Ill have perform ance safety factor full sign full power can climb slowly up altitude signs have also towed three other planes club did job ease 25-powered QuickStick 40-powered Sweet-Stick 60-powered Aeromaster three slowed down well below full throttle maintain realistic airspeed circled field Sweet-Stick however has flown little faster desirable maintain safe control So can tow sign also drop before landing plane will need re leasable towhook should located bottom fuselage near cen ter gravity possible EK Logic trol hook does excellent job photo 3 shows mockup installation sim ple metal guard added front hook prevents towline falling off hook preparing takeoff light spring also added keep hook locked position until servo releases it How actuate towhook release servo will depend setup plane select ingenuity Since plane uses three channels use throttle servo bringing throttle full idle moves pushrod unlock towhook Towing Sign two methods lifting sign off ground both used LOCATE CONNECTOR LINE ALONG HERE LOCATE CONNECTOR POLE HERE LOCASE CCTITS2TC LINE /16 4 41/4 4 21/32 ASSENBLY BOARD LAYOUT Fig 1 Ij j II II LOCATE CONNECTOR LOOPS AT ONE OF THESE SEVEN DISTANCES SELECT DISTANCE B FROTI TLE 2 FOR THE LETTER BEING ASS~LED ALONG 4 13/16 5 1/in 5 7/16 DISTANCE B 111 1 I I December 1977 45 6 1 ~1 3 An EK releasable hook used towing allows dropping sign before landing three-channel system author used throttle servo release full idle moves pushrod unlock towhook 4 Before takeoff sign stretched out along takeoft path tew teet ott tne sloe ito avoio snagging gear aruurIi e forward connect towhook least 4 feet air passes over front sign steady climb plane will peel sign off ground 4-lb test monofilament line nylon rope pic visibility 36 40 ft long 46 Model Aviation 2 Basic elements sign front end left bridle towline right drag letters interchangeable 5 mockup photo portrays installation towhook b xternaI view ot tne TownooK drophook installation cable drophook drophook used lift sign aerial pickup release drophook clearly visible servos set lock used see text description rather tow takeoff both hooks Balsa spool pic 5 unwinds drophook cord 7 The drophook shaped soft iron wire must have no sharp projections Just enough solder added give little weight positive drop Note hole braided release cable engages old-timers still used today Either way interesting challenge RC pilot because realism both exciting spectators watch first method youll lift sign off ground plane takes off climbs out Start placing plane takeoff position Stretch sign out di rectly along takeoff path front sign nearest plane See photo 4 Connect monofilament towline bridle sign run free end line back plane straight back lays along takeoff path might catch landing gear horizontal stabilizer during takeoff So lay about 3 4 feet off side takeoff path bring around behind plane run up forward con nect towhook long should towline Just long enough plane can take off least 4 feet air passes over front sign steady normal climb As plane continues its climb sign will peel off ground follow along way sign never drags across ground Make towline 4-lb test monofilament tie 3/t-in towring end After gain experi ence youll want towline short good judgment will allow realis tic appearance plane requires 36- 45-ft towline length depends wind affects takeoff Make takeoffs wind sign gets kite-like lift during first few moments lift-off until starts trailing vertically considerably eases bur den towplane After climb-out regulate power airspeed fly slow path around field Use distances Dist WDist D 13/16 13/16 3 1/2 1 3/16 1 1/2 3 7/8 4 1/4 4 1/4 411/16 115/16 2 3/4 4 1/4 4 2 1/32 421/32 4 2 1/32 4 21/32 413/16 5 1/16 5 7/16 characters apostrophe Colon E F J L Space Period comma Dash B D N 0 P Q R U 2356789 T V X Y 4 C G H K S Z $ M W Note All dimensions inches characters except small punctuation marks 6 1/4 high characters have 1 3/16 stroke December 1977 47 8 Rig aerial pickup consists two 8-ft bamboo poles set about eight feet apart Drophook released circling field plane flown about 4 feet above pickup loop top poles Tie scraps bright colored cloth loop drophook visibility TABLE 2 CHARACTER DIMENSIONS nere planeout picture rlgntnas snaggea pickup ioop ax moaerame speea gone high-power climbout sign has begun peel off ground author right concentrates control 4-lb line will break hook something mistake 50 100 feet Fly just fast enough keep sign tugged out straight main tain safe controllable airspeed plane Flying too fast easy will appear unrealistic cause undue sign flutter Since letter flutters like miniature flag continuous high airspeed can eventually damage sign As might expect towing load like plane will fly slower given power setting therefore respond slowly control movements ever because towline attached center gravity plane should have positive control response no unusual flight characteristics speak towing load Im referring drag cre ated sign its weight com plete 30-letter sign including bridle drag weighs about 4 ounces weight little significance Dropping sign simple just actuate towhook release sign will drop gently ground no damage Now have doubts about self plane trying heres safe easy way first few flights tow word get feel system method try two words three etc making several flights stage until towing full sign prepared abort tow time plane sign doesnt have way want Just drop sign think over later time crease load climb up safe altitude check planes performance control response progressing slowly like youll accomplish two things 1 youll develop full confidence yourself plane 2 youll find out long sign plane can safely tow second method lift-off extra equipment required optional requires precise flying dont hesitate try itits fun method youll fly plane over sign pick up trailing drophook Youll need 13 assemble letter parts laid Out shown assembly board layout Use aliphatic glue like Titebond Household Cement Ambroid etc. will curl up fabric make too rigid See text 48 Model Aviation 10 Sign towing has its special language Shown terms will using materials need listed Table 1 11 plentiful supply pre-cut bamboo oriental wall hangings found import shops department stores Other items found fishing tackle counter fabric store hobby shop 12 Preparing materials make character Also see Fig 11 Shown bamboo strips connector pole stiffeners two connector linesbutton carpet thread pieces about 10 long same towhook before youll also need drophook towline release mechanism shown photos 5 6 7 towline run 10-ft length monofila ment through center rectangular balsa spool Tie towring top end drophook bottom end Make drophook soft iron wire has no sharp projections just enough solder give little weight store line flight keep tangling wrap snugly around spool place spool hook hook-housing Put towring towhook set servos secure towhook drophook place prior flight braided throttle cable shown works fine drophook release As before Ill leave design servo action needed release drophook Photo 8 shows rig sign pickup Set up two 8-ft bamboo poles about 8 feet apart Beforehand make small vee-notch tip pole Lay sign out along flight path did first method towing bridle centered between poles make 24-ft monofilament line pickup loop Connect both ends line bridle lay loop formed across top two notched poles Last tie piece bright-colored yarn center loop another piece end drophook make visible Take off release drophook circling field As falls towline will unwind balsa spool until fully extended Since airstream will make trail back angle hook will about 8 feet below plane Guide plane moderate speed fly about 4 feet above center poles Just plane reaches poles apply full throttle establish normal climb did everything right drophook will catch pickup loop sign will gently peel off ground photo 9 didnt can always circle around try again dimensions given total towline will 22 feet long drophook line 10 feet pickup loop stretches out 12 feet length gives realistic appearance longer towline may need takeoff method Now understand sign picked up consider two precautions Use 4-lb test monofilamentif hook something mistake youll glad breaks Dont plant poles too firmly ground Can guess Now can tow sign dont recom mend novice dont think have expert pattern-pilot either best advice can fly plane vice versa can make plane go want what want can tow sign Sign Construction First check terms well using shown photo 10 materials youll need listed Ta ble 1 quantities arent specified since will depend letters tend make fabric store fishing tackle counter favorite hobby shop will supply needs except photo 11 reveals can find plentiful supply pre-cut bam boo oriental wall-hangings can find import shops department stores quality size strips vary somewhat after cull out December1977 49 14 Four steps forming connector end connector pole R Retainer sequins forced over bamboo connector pole shish kebab style Drill hole piece hardwood handy tool 15 character has connector pole front connector loops back Strip bamboo stiffens edge leading edge characterexcept commas etcrequire balance weight bottom 16 same principles applied characters whether letters numerals punctuation marks spaces between char acters nothing two connector lines connector pole 17 towing bridle must rugged because takes full brunt towing load Note strip solder wrapped around bottom bridle connector pole front sign trails vertically rest follows bad ones youll have toughest materials going Use strips about 3/64 1/16-in square slight variations wont hurt Now about shape letters Space wont permit drawing out whole alphabet plenty reference books However recommend using Gothic style letters shown Theyre boxy enough simple make yet have some eye-appeal easy read Also Id like recommend some basic proportions sizes letters will provide weight drag similar have tested Table 2 can see characters except small punctuation marks 6-in high have 1-3/16-in stroke will probably know letters same width spacing between different combinations letters varies give pleasing appearance Table 2 distances W D provided pur pose Once youve designed letters around basic proportions draw out 5 X 8 card can used template punch tiny holes card lines forming letters intersect Lay template fabric line edge card up fabric grain push felt-tipped pen through hole provide points outlining letter As cut letter out handle raw edges care prevent raveling Youll read later prevent finished letter Next youll need prepare simple assembly-board hold pieces let ter place glue together Fig 1 shows lay out piece ply wood Any letters numbers punc tuation marks can assembled scheme difference being locate connector loops establish distance D character making Photo 12 shows next step preparing materials make letter Cut out letter want start select bamboo strips connector pole stiffeners Next prepare two connector lines cut piece button capret thread about 10 long Form connector loop tying snugly around scrap Nyrod tubing slightly smaller diameter se quins used form connector see photo 14 A-in diameter sequins 3/16-in diameter Nyrod works out just right Apply drop glue knot before trimming off excess thread Make sure glue doesnt penetrate loop itself because loop should remain soft limber photos 12 14 can see loops connectors form simple connections between letters con necting letters together 1oop will stretch out oval shape slide over con nector easily sign towed 1oop stretches out tightly remains secure its connector Disassembling letters equally simple suggest make up sample two 1oop connector make sure assemble easily yet secure subjected pull assemble letter lay parts out shown photo 13 Insert pins brads assembly-board establish distance D Table 2 would 4-21/32 number 8 shown being assem bled sure connector lines under slight equal tension apply slender bead blue along joints tween bamboo thread fabric Make sure glue joints complete keep narrow possible letter will remain flexible Use aliphatic glue like Titebond household Ambroid glue will curl up fabric also make too rigid Youll find helpful hold bamboo strips down heavy fishing weights glue dries Next use small paint brush coat Continued page 91 50 Model Aviation 18 An expanding file provides handy storage keeps letters unwrinkled Authors kit contain 106 characters including five commonly used letters assembles sign field 15 minutes must have lost frequency pin club project qualify several pilots airplanes WHEELS RO WHEELS Smooth inflatable wheels big airplanes Features two piece bolt gether hubs hub caps Wheels can inflated deflated thru tiny valve side tire pressure de sire Truly remark able realistic looking wheel I$795 Pair 450R4-1 /2 Diameter995 Pair SOOR 5 Diameter11 95 Pair 550R5-1 /2 Diameter1 395 Pair 600R ameter1 595 Pair Low bounce shock absorbing wheels featuring 6 spoke dura hub finest quality hand inspected 175Tor RWheels 1-3/4$219 Pair 200 T RWheels 2239 Pair 225 T R SWheels 2-1/4259 Pair 250 T R SWheels 2-1/2279 Pair 275 T R 5Wheels 2-3/4299 Pair 300 T R 5Wheels 3319 Pair 325 T RWheels 3-1 /4339 Pair 350 T RWheels 3-1/2359 Pair DUBRO PRODUCTS INCORPORATED 480 BONNER ROAD WAUCONDA ILL 60084 total duration 75623 Fortunately FAI Sporting Code states explicitly required seaplanes land water So new record record-setting plane tree top Glenn Scillian went get help friends area spied ropes holding up canopy ropes hatchet John Tallmans car plunged through poison ivy base plane-eating tree climbed tree attacked offending branches After long exhausting work Shark fell stages ground delighted find damage minimal Lots fuel left later measure ment showed 35 fi oz 42% origi nal fuel remained tanks enough additional 5 hours same rate fuel usage longer leaner mixture ligher model ever records made actual rather potential performance Surpassing German record 25% quite satis fying result Special thanks order official witnesses some took day va cation leave help Friday lake busy Particular recognition due invisible Kenny Greenhouse Long ago Kenny assigned role documenting record attempts camera have never picture record articles Thanks also Dean Smith Lee Shiflett supplied critical parts flight Record setting exciting re warding activity doesnt require weekly travel follow contest circuit yet can compete entire world Opti mizing element modelair frame engine fuel system other componentsis necessary succeed Originality needed since wont find standardized approaches seen nor mal competition Free flight neglected area USA has 27 outdoor free flight records nearly held eastern European countries Control line radio control also have room improved performances Lets get going Tow Signs/Layers continued page 50 remaining raw fabric edges aliphatic glue has thinned 50-50 water Coat just /8-in margin fab ric will effectively stop edges raveling yet leave letter flexi ble After glue dry remove letter board trim off excess thread rough fabric edges part stiffener extends beyond edge letter Leave connector pole extra long now Photo 14 shows steps forming connector end connector pole Notice letters square front corners must have fabric cut out slight ly area Slip two sequins place leaving 1/16 3/32 between Although hole sequins small can forced over bamboo easily shish kebab style scrap ply wood hole makes fine tool push trim off bamboo leaving about 1/32 projecting form good glue joint Now glue sequins place epoxy sure form complete fillet epoxy between bamboo sequin surfaces As form inboard fillet let epoxy cover joint between connector line thread connector pole reinforcement junction pole sequins thread must good strong since entire towing load concentrated point last step letter finished Slide split-shot weight place photo 14 squeeze tightly fastened over both connector line thread fabric Youll have trim fabric edge back little get weight right position shapes other characters vary illustrated construc tion principles same charac ter has connector pole front connector loops back strip bamboo stiffens edge lead ing edge character needs balance December1977 91 WHOLE NEW LINE OF SMOOTH INFLATABLE BIG WHEELS 4 4Y 5 51h& 6 TREAD T SMOOTH R SLICKS 5 2 KITS e PLANS ACCESSORIES 1417 ME 17W SPAN STOCK NO PP 15 KIT $425 4 WALNUT SCALE KITS RART ACE$425 PEANUT SCALE KITS J3 CUE$329 PIREENPOL$329 MILES$329 TURRULENT$329 MUSTANG$349 ZERO$349 COUGAR$349 AIIIDREASOId$349 GIPSY MOTH$349 GANAGORIE$349 SPORT MODEL KITS ONE NITE 28$475 ONE NITE 16$349 STRINGLESS WONDER$249 PEcK ROD$139 KITS 0 PLANS S ACCESSORIES REAL JAPANESE TISSUEPROPS COMPLETE CATALOG 50 MANY HARD TO FIND ITEMS pP 0 BOX 2498 -AMALA MESA CAUF 92041 WPHONE 7141 4694675 17141 4424636 weight except very light ones such letter comma space Look over various photos especially photos 15 16 youll see principles applied entire alpha bet numbers punctuation marks Youll see too space nothing two connector lines connector pole Making letter takes little time reading about making lots sounds tedious lay out Fig 1 pattern ten places sheet plywood can assembly-line project making several time simplicity drag shown photo 17 assembly methods same four fingers formed cut ting slits drag better job re ducing flutter solid piece fabric Incidentally Ive tried variety drag de signs including U-shaped type used real signs Although shown doesnt provide scale appearance does best job sure coat raw fabric edges thinned-out glue dont put bal ance weight drag towing bridle also shown photo 17 must rugged because takes full brunt towing load Use monofila ment bridle rather thread use heavier bamboo dowel about 3/32 diameter pole Tie monofil ament swivel-snap 2 di mension wont change tie end pole After can form connector loops about 1 hind pole Epoxy monofilament pole epoxy knots too Wrap 4 inches A-in solder around bottom pole balance weight get front sign trail verti cally rest sign inclined same Now letters numbers punctuation marks will need Heres easy way find own answer Plan first sign message youll want tow regularly Mine read JOIN THE PALM BEACH SKYHAWKS TODAY provides beginning letter inventory lets start fly ing soon possible invent new messages tow build addi tional characters need way can build inventory over long period time yet enjoy towing signs youre doing field kit photo 18 contains 106 characters has five commonly used letters fewer others expanding file shown provides handy storage keeps letters un wrinkled Come think have 107 last Santa-in-a-sleigh towed front Merry Christmas sign suggest keep written inventory characters have time plan message can check quickly see have enough As Ns Ts etc make plan sign find lack certain letters complete stop think slight rewording might put idea across letters have STATEMENT OF OWNERS*41P MANAGEMENT AND CIRCULATION Rrqojred 39 USC 3683 1 TeIeoIPc6lisssion MODELAVIATION A PaIIuetofl No. 067930 2 Date ol Filing Sepseonben 13 1577 3 Frequency 01 sue Monthly A No01 Sues Publtehed Annually 12 8 Annual Sattcnipnon Prico Sn20G 4 Location 01 known OlIton 01 putaication street city county stale ZIP code pnnnnrsl 815 FIteenttn Sn NW Weahiognon DC 2008h 5 Location headquarters aecerel business offices publishers Non printers 815 Fitneensh St. NW Weshinston DC 211015 6 Names connplens addrinses Publisher Editor Monesins Editor PutnlelnOr Gel S Whenlen 015 Fjtteanth Sn. NW Washinason DC 20605 Editor Wlliaen 3 Winner 8th Ftneennh Sn. NW Wsshington DC 20006 Managing Edsor NONE 7Owner Acscssecyol Model Aeronautios81h Fmfttenth Sn. NW Washington DC 206155 8Know bondltolders wor69gees Other tacOriny holders owning hold jog n% went total amount 01 bonds orornns Othpr securities NONE S For coenpienmon nonptotit organicotions authorized snail spocial rates Igoonror 132n22 PSMI Tbn purpose lunction end nonprolit status nhs orOenjeeton tuempn status Icr Foderal incowe too ponprees ham non changed during preceding 12 moonhe Ecoent cod Nalorr Cnculation nIl Actual Acerageno copies no copies01 tiOgir eachissueissue duriogoublished prenadingnearest l2nlectheillingdane ATotal No COpes Printed Net Press Ron3703530106 BPard Ciroulation 1 Sales lhruuoh Dealers end Carriers SIrens Veodurs end Counter Sales23742306 2Mail Subtonrytross2911732d1S CTotal Paid Circulanmoo31 49135211 0Frco Djsgnibullun Mel Carrier Other Meaos Samylns Complmennary Other Finn Copres360621 30 ETotal Distribution Suns C cod Dl3517737341 FCopies No Dtnributerl 1Oltise Usc LOttOmr Unacoocoted Seciled eltor Printing10691750 2Returns row New Agente UTotal Sum E Fl end 2should equal press run show Al3703h39106 11 I certify stagrorennO made abum ore correct complete CARL S WFIEE LET Publisher Big Day Arrives Okay now youre ready try signs first time some final thoughts remind ers get field youll find takes 15 minutes assemble full sign decide make up night before flying youll pleased learn complete sign folds neatly shoe box room left lunch sure keep signs dry make sure grass isnt damp lay out fabric would soak up moisture like blotter youd never get off ground Using item start lets make up checklist precautions first few flights 1 Keep signs dry 2 Before takeoff check sign sure connectors secure wind flips sign about check again 3 Do test flying easy stages first word two 4 Keep spectators off side make pass drophook trail ing 5 Make sign lift-offs wind make normal climb-outs 6 During lift-off keep eyes tention plane Dont worry about signit will follow along has no other choice 7 Be prepared drop sign en gine falters especially during lift-off climb-out 8 Maintain performance safety factor never towing sign long cant climb plane altitude 9 Abide field safety rules usual Youll tempted tow sign right over crowd dont End Well thats build em thats tow em hope readers will try because its chal lenging yet useful project Also might want look prospects making club project parcel out work making kit letters qualif several planes pilots towing So last 33 letters Ill close saying TRY TOWING YOUR OWN SIGNSITSALOTTA FUN Lets see now takes 5 Ts 2 Rs 2 Ys 4 0s tographs article made Lee Boozer Jimmy Zeak Chuck Stevens Emilic Fuente Bill Layers members Palm Beach Sky hawks Engine Technique/Jehlik continued page 51 surplus metal ammo box about 14 X 18 X 20 can store running equipment box Tank I prefer round RC klunk tank mounted auto hose clamp screwed top box Tank filler Anything squeeze bulb 92 Model Aviation FLY wITM R95511 eWUR 69tet 0 WALNUT SCALE ASK POE OUR KITS AND ACCESSORIES Al YOUR LOCAL DEALER IF NOT AVAILARLE AT YOUR DEALER ORDER DIRECT ADD 60 POSTAGE BROWN CO-2 ENGINES ENGINES ARE IN STOCK NEW CHARGER AND S SIZES OF TANKS RROWN ENGINES MUST RE ORDERED DIRECT FROM PECK-POLYMERS
Edition: Model Aviation - 1977/12
Page Numbers: 44, 45, 46, 47, 48, 49, 50, 91, 92
HOW WOULD YOU like tow variety signs next fun-fly First might assemble says BOMB DROP EVENT STARTS PROMPTLY AT 9 AM next message rib friends PLEASE REPLACE DI VOT AFTER EACH LANDING later reads DONT FORGET ELECTION NEXT MEETING Does raise lot questions hope because youre interested Id like tell you can make own fieldkit interchangeable letters tow just about sign want Heres project nutshell Youll make up individual characters letters numbers punctuation marks too want simple materials using conventional methods Youll make bridle towline front sign thing called drag back photo 1 Youll install releasable towhook bottom plane servo system operate big day arrives youll select letters need message connect together simply just few minutes youre ready go surprisingly youll find whole rig almost inde structible wont need super-plane tow ing youll find flying easy no big surprises Although novice shouldnt try good Sunday pilot can easily Circling field 50 100 feet sign easy read scale appearance gets attention time Before get details let set stage rest article recommendations based 18 months experience using 19-powered conventional RC model towing signs 12 15 feet long 6h-in-high let ters tow signs comparable ones describe learn towing safe easy steps Im confident youll have success Design Concepts Lets talk first about design requirements sign Obviously should light strong low drag towline towing bridle connecting lines needed make letters follow along order letters need stifleners leading edges theyll keep shapes balance weights bot tom edges sign will trail vertically lay over its side What isnt obvious need something minimize sign flutter know flag flutters breeze Well sign long slender flag would flutter grand scale except four simple things drag aft end tugs sign out straight letters flexible weight kept minimum balance weights used behind last letter sign factors pay off two ways aerodynamic forces expend themselves harmlessly fluttering trailing edges letters drag Reducing weight especially aft end prevents sign playing crack-the-whip normal small amount flutter does oc cur Dont surprised see little flut ter especially aft one-fourth sign real ones too 44 Model Aviation RC Towplane towplane se lect should will take off quickly climb rapidly fly slowly good stability TABLE 1 MATERIALS LIST Fabric polyester-cotton broadcloth Sequins 14 diameter Thread Talon Button & Carpet Extra Strong Bamboo 3/64 1/16 square 8 lengths Monofilament fishing line 4-pound test Lead split-shot weights size 3/0 about 3/16 diameter Swivel-snap size 5 Steel rings 3/8 diameter Releasable towhook EK Logictrol Stock No THR-1 Flexible servo cable braided metal Solder coreless 1/8 diameter Soft iron wire 1/32 diameter 1 The authors towplane high-lift design 580 sq powered veco 19 9/4 prop tows signs up 34 lettersabout 15 ft long Local club has used 25-powered Quick Stick 40-powered Sweet Stick 60-powered Aeromaster flown well below full throttle control have reserve power yond whats needed tow sign may want use lower pitch prop usual improve characteristics What type plane will work Ive pleasantly surprised find RC model can tow heck lot towplane photo 2 conventional high-lift design 580 sq powered standard Veco 19 turning 9/4 prop regularly tows signs up 34 letters length about 15 feet lifts sign off ground no struggle requires less full throttle maintain level flight Ive set limit 34 letters Ill have perform ance safety factor full sign full power can climb slowly up altitude signs have also towed three other planes club did job ease 25-powered QuickStick 40-powered Sweet-Stick 60-powered Aeromaster three slowed down well below full throttle maintain realistic airspeed circled field Sweet-Stick however has flown little faster desirable maintain safe control So can tow sign also drop before landing plane will need re leasable towhook should located bottom fuselage near cen ter gravity possible EK Logic trol hook does excellent job photo 3 shows mockup installation sim ple metal guard added front hook prevents towline falling off hook preparing takeoff light spring also added keep hook locked position until servo releases it How actuate towhook release servo will depend setup plane select ingenuity Since plane uses three channels use throttle servo bringing throttle full idle moves pushrod unlock towhook Towing Sign two methods lifting sign off ground both used LOCATE CONNECTOR LINE ALONG HERE LOCATE CONNECTOR POLE HERE LOCASE CCTITS2TC LINE /16 4 41/4 4 21/32 ASSENBLY BOARD LAYOUT Fig 1 Ij j II II LOCATE CONNECTOR LOOPS AT ONE OF THESE SEVEN DISTANCES SELECT DISTANCE B FROTI TLE 2 FOR THE LETTER BEING ASS~LED ALONG 4 13/16 5 1/in 5 7/16 DISTANCE B 111 1 I I December 1977 45 6 1 ~1 3 An EK releasable hook used towing allows dropping sign before landing three-channel system author used throttle servo release full idle moves pushrod unlock towhook 4 Before takeoff sign stretched out along takeoft path tew teet ott tne sloe ito avoio snagging gear aruurIi e forward connect towhook least 4 feet air passes over front sign steady climb plane will peel sign off ground 4-lb test monofilament line nylon rope pic visibility 36 40 ft long 46 Model Aviation 2 Basic elements sign front end left bridle towline right drag letters interchangeable 5 mockup photo portrays installation towhook b xternaI view ot tne TownooK drophook installation cable drophook drophook used lift sign aerial pickup release drophook clearly visible servos set lock used see text description rather tow takeoff both hooks Balsa spool pic 5 unwinds drophook cord 7 The drophook shaped soft iron wire must have no sharp projections Just enough solder added give little weight positive drop Note hole braided release cable engages old-timers still used today Either way interesting challenge RC pilot because realism both exciting spectators watch first method youll lift sign off ground plane takes off climbs out Start placing plane takeoff position Stretch sign out di rectly along takeoff path front sign nearest plane See photo 4 Connect monofilament towline bridle sign run free end line back plane straight back lays along takeoff path might catch landing gear horizontal stabilizer during takeoff So lay about 3 4 feet off side takeoff path bring around behind plane run up forward con nect towhook long should towline Just long enough plane can take off least 4 feet air passes over front sign steady normal climb As plane continues its climb sign will peel off ground follow along way sign never drags across ground Make towline 4-lb test monofilament tie 3/t-in towring end After gain experi ence youll want towline short good judgment will allow realis tic appearance plane requires 36- 45-ft towline length depends wind affects takeoff Make takeoffs wind sign gets kite-like lift during first few moments lift-off until starts trailing vertically considerably eases bur den towplane After climb-out regulate power airspeed fly slow path around field Use distances Dist WDist D 13/16 13/16 3 1/2 1 3/16 1 1/2 3 7/8 4 1/4 4 1/4 411/16 115/16 2 3/4 4 1/4 4 2 1/32 421/32 4 2 1/32 4 21/32 413/16 5 1/16 5 7/16 characters apostrophe Colon E F J L Space Period comma Dash B D N 0 P Q R U 2356789 T V X Y 4 C G H K S Z $ M W Note All dimensions inches characters except small punctuation marks 6 1/4 high characters have 1 3/16 stroke December 1977 47 8 Rig aerial pickup consists two 8-ft bamboo poles set about eight feet apart Drophook released circling field plane flown about 4 feet above pickup loop top poles Tie scraps bright colored cloth loop drophook visibility TABLE 2 CHARACTER DIMENSIONS nere planeout picture rlgntnas snaggea pickup ioop ax moaerame speea gone high-power climbout sign has begun peel off ground author right concentrates control 4-lb line will break hook something mistake 50 100 feet Fly just fast enough keep sign tugged out straight main tain safe controllable airspeed plane Flying too fast easy will appear unrealistic cause undue sign flutter Since letter flutters like miniature flag continuous high airspeed can eventually damage sign As might expect towing load like plane will fly slower given power setting therefore respond slowly control movements ever because towline attached center gravity plane should have positive control response no unusual flight characteristics speak towing load Im referring drag cre ated sign its weight com plete 30-letter sign including bridle drag weighs about 4 ounces weight little significance Dropping sign simple just actuate towhook release sign will drop gently ground no damage Now have doubts about self plane trying heres safe easy way first few flights tow word get feel system method try two words three etc making several flights stage until towing full sign prepared abort tow time plane sign doesnt have way want Just drop sign think over later time crease load climb up safe altitude check planes performance control response progressing slowly like youll accomplish two things 1 youll develop full confidence yourself plane 2 youll find out long sign plane can safely tow second method lift-off extra equipment required optional requires precise flying dont hesitate try itits fun method youll fly plane over sign pick up trailing drophook Youll need 13 assemble letter parts laid Out shown assembly board layout Use aliphatic glue like Titebond Household Cement Ambroid etc. will curl up fabric make too rigid See text 48 Model Aviation 10 Sign towing has its special language Shown terms will using materials need listed Table 1 11 plentiful supply pre-cut bamboo oriental wall hangings found import shops department stores Other items found fishing tackle counter fabric store hobby shop 12 Preparing materials make character Also see Fig 11 Shown bamboo strips connector pole stiffeners two connector linesbutton carpet thread pieces about 10 long same towhook before youll also need drophook towline release mechanism shown photos 5 6 7 towline run 10-ft length monofila ment through center rectangular balsa spool Tie towring top end drophook bottom end Make drophook soft iron wire has no sharp projections just enough solder give little weight store line flight keep tangling wrap snugly around spool place spool hook hook-housing Put towring towhook set servos secure towhook drophook place prior flight braided throttle cable shown works fine drophook release As before Ill leave design servo action needed release drophook Photo 8 shows rig sign pickup Set up two 8-ft bamboo poles about 8 feet apart Beforehand make small vee-notch tip pole Lay sign out along flight path did first method towing bridle centered between poles make 24-ft monofilament line pickup loop Connect both ends line bridle lay loop formed across top two notched poles Last tie piece bright-colored yarn center loop another piece end drophook make visible Take off release drophook circling field As falls towline will unwind balsa spool until fully extended Since airstream will make trail back angle hook will about 8 feet below plane Guide plane moderate speed fly about 4 feet above center poles Just plane reaches poles apply full throttle establish normal climb did everything right drophook will catch pickup loop sign will gently peel off ground photo 9 didnt can always circle around try again dimensions given total towline will 22 feet long drophook line 10 feet pickup loop stretches out 12 feet length gives realistic appearance longer towline may need takeoff method Now understand sign picked up consider two precautions Use 4-lb test monofilamentif hook something mistake youll glad breaks Dont plant poles too firmly ground Can guess Now can tow sign dont recom mend novice dont think have expert pattern-pilot either best advice can fly plane vice versa can make plane go want what want can tow sign Sign Construction First check terms well using shown photo 10 materials youll need listed Ta ble 1 quantities arent specified since will depend letters tend make fabric store fishing tackle counter favorite hobby shop will supply needs except photo 11 reveals can find plentiful supply pre-cut bam boo oriental wall-hangings can find import shops department stores quality size strips vary somewhat after cull out December1977 49 14 Four steps forming connector end connector pole R Retainer sequins forced over bamboo connector pole shish kebab style Drill hole piece hardwood handy tool 15 character has connector pole front connector loops back Strip bamboo stiffens edge leading edge characterexcept commas etcrequire balance weight bottom 16 same principles applied characters whether letters numerals punctuation marks spaces between char acters nothing two connector lines connector pole 17 towing bridle must rugged because takes full brunt towing load Note strip solder wrapped around bottom bridle connector pole front sign trails vertically rest follows bad ones youll have toughest materials going Use strips about 3/64 1/16-in square slight variations wont hurt Now about shape letters Space wont permit drawing out whole alphabet plenty reference books However recommend using Gothic style letters shown Theyre boxy enough simple make yet have some eye-appeal easy read Also Id like recommend some basic proportions sizes letters will provide weight drag similar have tested Table 2 can see characters except small punctuation marks 6-in high have 1-3/16-in stroke will probably know letters same width spacing between different combinations letters varies give pleasing appearance Table 2 distances W D provided pur pose Once youve designed letters around basic proportions draw out 5 X 8 card can used template punch tiny holes card lines forming letters intersect Lay template fabric line edge card up fabric grain push felt-tipped pen through hole provide points outlining letter As cut letter out handle raw edges care prevent raveling Youll read later prevent finished letter Next youll need prepare simple assembly-board hold pieces let ter place glue together Fig 1 shows lay out piece ply wood Any letters numbers punc tuation marks can assembled scheme difference being locate connector loops establish distance D character making Photo 12 shows next step preparing materials make letter Cut out letter want start select bamboo strips connector pole stiffeners Next prepare two connector lines cut piece button capret thread about 10 long Form connector loop tying snugly around scrap Nyrod tubing slightly smaller diameter se quins used form connector see photo 14 A-in diameter sequins 3/16-in diameter Nyrod works out just right Apply drop glue knot before trimming off excess thread Make sure glue doesnt penetrate loop itself because loop should remain soft limber photos 12 14 can see loops connectors form simple connections between letters con necting letters together 1oop will stretch out oval shape slide over con nector easily sign towed 1oop stretches out tightly remains secure its connector Disassembling letters equally simple suggest make up sample two 1oop connector make sure assemble easily yet secure subjected pull assemble letter lay parts out shown photo 13 Insert pins brads assembly-board establish distance D Table 2 would 4-21/32 number 8 shown being assem bled sure connector lines under slight equal tension apply slender bead blue along joints tween bamboo thread fabric Make sure glue joints complete keep narrow possible letter will remain flexible Use aliphatic glue like Titebond household Ambroid glue will curl up fabric also make too rigid Youll find helpful hold bamboo strips down heavy fishing weights glue dries Next use small paint brush coat Continued page 91 50 Model Aviation 18 An expanding file provides handy storage keeps letters unwrinkled Authors kit contain 106 characters including five commonly used letters assembles sign field 15 minutes must have lost frequency pin club project qualify several pilots airplanes WHEELS RO WHEELS Smooth inflatable wheels big airplanes Features two piece bolt gether hubs hub caps Wheels can inflated deflated thru tiny valve side tire pressure de sire Truly remark able realistic looking wheel I$795 Pair 450R4-1 /2 Diameter995 Pair SOOR 5 Diameter11 95 Pair 550R5-1 /2 Diameter1 395 Pair 600R ameter1 595 Pair Low bounce shock absorbing wheels featuring 6 spoke dura hub finest quality hand inspected 175Tor RWheels 1-3/4$219 Pair 200 T RWheels 2239 Pair 225 T R SWheels 2-1/4259 Pair 250 T R SWheels 2-1/2279 Pair 275 T R 5Wheels 2-3/4299 Pair 300 T R 5Wheels 3319 Pair 325 T RWheels 3-1 /4339 Pair 350 T RWheels 3-1/2359 Pair DUBRO PRODUCTS INCORPORATED 480 BONNER ROAD WAUCONDA ILL 60084 total duration 75623 Fortunately FAI Sporting Code states explicitly required seaplanes land water So new record record-setting plane tree top Glenn Scillian went get help friends area spied ropes holding up canopy ropes hatchet John Tallmans car plunged through poison ivy base plane-eating tree climbed tree attacked offending branches After long exhausting work Shark fell stages ground delighted find damage minimal Lots fuel left later measure ment showed 35 fi oz 42% origi nal fuel remained tanks enough additional 5 hours same rate fuel usage longer leaner mixture ligher model ever records made actual rather potential performance Surpassing German record 25% quite satis fying result Special thanks order official witnesses some took day va cation leave help Friday lake busy Particular recognition due invisible Kenny Greenhouse Long ago Kenny assigned role documenting record attempts camera have never picture record articles Thanks also Dean Smith Lee Shiflett supplied critical parts flight Record setting exciting re warding activity doesnt require weekly travel follow contest circuit yet can compete entire world Opti mizing element modelair frame engine fuel system other componentsis necessary succeed Originality needed since wont find standardized approaches seen nor mal competition Free flight neglected area USA has 27 outdoor free flight records nearly held eastern European countries Control line radio control also have room improved performances Lets get going Tow Signs/Layers continued page 50 remaining raw fabric edges aliphatic glue has thinned 50-50 water Coat just /8-in margin fab ric will effectively stop edges raveling yet leave letter flexi ble After glue dry remove letter board trim off excess thread rough fabric edges part stiffener extends beyond edge letter Leave connector pole extra long now Photo 14 shows steps forming connector end connector pole Notice letters square front corners must have fabric cut out slight ly area Slip two sequins place leaving 1/16 3/32 between Although hole sequins small can forced over bamboo easily shish kebab style scrap ply wood hole makes fine tool push trim off bamboo leaving about 1/32 projecting form good glue joint Now glue sequins place epoxy sure form complete fillet epoxy between bamboo sequin surfaces As form inboard fillet let epoxy cover joint between connector line thread connector pole reinforcement junction pole sequins thread must good strong since entire towing load concentrated point last step letter finished Slide split-shot weight place photo 14 squeeze tightly fastened over both connector line thread fabric Youll have trim fabric edge back little get weight right position shapes other characters vary illustrated construc tion principles same charac ter has connector pole front connector loops back strip bamboo stiffens edge lead ing edge character needs balance December1977 91 WHOLE NEW LINE OF SMOOTH INFLATABLE BIG WHEELS 4 4Y 5 51h& 6 TREAD T SMOOTH R SLICKS 5 2 KITS e PLANS ACCESSORIES 1417 ME 17W SPAN STOCK NO PP 15 KIT $425 4 WALNUT SCALE KITS RART ACE$425 PEANUT SCALE KITS J3 CUE$329 PIREENPOL$329 MILES$329 TURRULENT$329 MUSTANG$349 ZERO$349 COUGAR$349 AIIIDREASOId$349 GIPSY MOTH$349 GANAGORIE$349 SPORT MODEL KITS ONE NITE 28$475 ONE NITE 16$349 STRINGLESS WONDER$249 PEcK ROD$139 KITS 0 PLANS S ACCESSORIES REAL JAPANESE TISSUEPROPS COMPLETE CATALOG 50 MANY HARD TO FIND ITEMS pP 0 BOX 2498 -AMALA MESA CAUF 92041 WPHONE 7141 4694675 17141 4424636 weight except very light ones such letter comma space Look over various photos especially photos 15 16 youll see principles applied entire alpha bet numbers punctuation marks Youll see too space nothing two connector lines connector pole Making letter takes little time reading about making lots sounds tedious lay out Fig 1 pattern ten places sheet plywood can assembly-line project making several time simplicity drag shown photo 17 assembly methods same four fingers formed cut ting slits drag better job re ducing flutter solid piece fabric Incidentally Ive tried variety drag de signs including U-shaped type used real signs Although shown doesnt provide scale appearance does best job sure coat raw fabric edges thinned-out glue dont put bal ance weight drag towing bridle also shown photo 17 must rugged because takes full brunt towing load Use monofila ment bridle rather thread use heavier bamboo dowel about 3/32 diameter pole Tie monofil ament swivel-snap 2 di mension wont change tie end pole After can form connector loops about 1 hind pole Epoxy monofilament pole epoxy knots too Wrap 4 inches A-in solder around bottom pole balance weight get front sign trail verti cally rest sign inclined same Now letters numbers punctuation marks will need Heres easy way find own answer Plan first sign message youll want tow regularly Mine read JOIN THE PALM BEACH SKYHAWKS TODAY provides beginning letter inventory lets start fly ing soon possible invent new messages tow build addi tional characters need way can build inventory over long period time yet enjoy towing signs youre doing field kit photo 18 contains 106 characters has five commonly used letters fewer others expanding file shown provides handy storage keeps letters un wrinkled Come think have 107 last Santa-in-a-sleigh towed front Merry Christmas sign suggest keep written inventory characters have time plan message can check quickly see have enough As Ns Ts etc make plan sign find lack certain letters complete stop think slight rewording might put idea across letters have STATEMENT OF OWNERS*41P MANAGEMENT AND CIRCULATION Rrqojred 39 USC 3683 1 TeIeoIPc6lisssion MODELAVIATION A PaIIuetofl No. 067930 2 Date ol Filing Sepseonben 13 1577 3 Frequency 01 sue Monthly A No01 Sues Publtehed Annually 12 8 Annual Sattcnipnon Prico Sn20G 4 Location 01 known OlIton 01 putaication street city county stale ZIP code pnnnnrsl 815 FIteenttn Sn NW Weahiognon DC 2008h 5 Location headquarters aecerel business offices publishers Non printers 815 Fitneensh St. NW Weshinston DC 211015 6 Names connplens addrinses Publisher Editor Monesins Editor PutnlelnOr Gel S Whenlen 015 Fjtteanth Sn. NW Washinason DC 20605 Editor Wlliaen 3 Winner 8th Ftneennh Sn. NW Wsshington DC 20006 Managing Edsor NONE 7Owner Acscssecyol Model Aeronautios81h Fmfttenth Sn. NW Washington DC 206155 8Know bondltolders wor69gees Other tacOriny holders owning hold jog n% went total amount 01 bonds orornns Othpr securities NONE S For coenpienmon nonptotit organicotions authorized snail spocial rates Igoonror 132n22 PSMI Tbn purpose lunction end nonprolit status nhs orOenjeeton tuempn status Icr Foderal incowe too ponprees ham non changed during preceding 12 moonhe Ecoent cod Nalorr Cnculation nIl Actual Acerageno copies no copies01 tiOgir eachissueissue duriogoublished prenadingnearest l2nlectheillingdane ATotal No COpes Printed Net Press Ron3703530106 BPard Ciroulation 1 Sales lhruuoh Dealers end Carriers SIrens Veodurs end Counter Sales23742306 2Mail Subtonrytross2911732d1S CTotal Paid Circulanmoo31 49135211 0Frco Djsgnibullun Mel Carrier Other Meaos Samylns Complmennary Other Finn Copres360621 30 ETotal Distribution Suns C cod Dl3517737341 FCopies No Dtnributerl 1Oltise Usc LOttOmr Unacoocoted Seciled eltor Printing10691750 2Returns row New Agente UTotal Sum E Fl end 2should equal press run show Al3703h39106 11 I certify stagrorennO made abum ore correct complete CARL S WFIEE LET Publisher Big Day Arrives Okay now youre ready try signs first time some final thoughts remind ers get field youll find takes 15 minutes assemble full sign decide make up night before flying youll pleased learn complete sign folds neatly shoe box room left lunch sure keep signs dry make sure grass isnt damp lay out fabric would soak up moisture like blotter youd never get off ground Using item start lets make up checklist precautions first few flights 1 Keep signs dry 2 Before takeoff check sign sure connectors secure wind flips sign about check again 3 Do test flying easy stages first word two 4 Keep spectators off side make pass drophook trail ing 5 Make sign lift-offs wind make normal climb-outs 6 During lift-off keep eyes tention plane Dont worry about signit will follow along has no other choice 7 Be prepared drop sign en gine falters especially during lift-off climb-out 8 Maintain performance safety factor never towing sign long cant climb plane altitude 9 Abide field safety rules usual Youll tempted tow sign right over crowd dont End Well thats build em thats tow em hope readers will try because its chal lenging yet useful project Also might want look prospects making club project parcel out work making kit letters qualif several planes pilots towing So last 33 letters Ill close saying TRY TOWING YOUR OWN SIGNSITSALOTTA FUN Lets see now takes 5 Ts 2 Rs 2 Ys 4 0s tographs article made Lee Boozer Jimmy Zeak Chuck Stevens Emilic Fuente Bill Layers members Palm Beach Sky hawks Engine Technique/Jehlik continued page 51 surplus metal ammo box about 14 X 18 X 20 can store running equipment box Tank I prefer round RC klunk tank mounted auto hose clamp screwed top box Tank filler Anything squeeze bulb 92 Model Aviation FLY wITM R95511 eWUR 69tet 0 WALNUT SCALE ASK POE OUR KITS AND ACCESSORIES Al YOUR LOCAL DEALER IF NOT AVAILARLE AT YOUR DEALER ORDER DIRECT ADD 60 POSTAGE BROWN CO-2 ENGINES ENGINES ARE IN STOCK NEW CHARGER AND S SIZES OF TANKS RROWN ENGINES MUST RE ORDERED DIRECT FROM PECK-POLYMERS
Edition: Model Aviation - 1977/12
Page Numbers: 44, 45, 46, 47, 48, 49, 50, 91, 92
HOW WOULD YOU like tow variety signs next fun-fly First might assemble says BOMB DROP EVENT STARTS PROMPTLY AT 9 AM next message rib friends PLEASE REPLACE DI VOT AFTER EACH LANDING later reads DONT FORGET ELECTION NEXT MEETING Does raise lot questions hope because youre interested Id like tell you can make own fieldkit interchangeable letters tow just about sign want Heres project nutshell Youll make up individual characters letters numbers punctuation marks too want simple materials using conventional methods Youll make bridle towline front sign thing called drag back photo 1 Youll install releasable towhook bottom plane servo system operate big day arrives youll select letters need message connect together simply just few minutes youre ready go surprisingly youll find whole rig almost inde structible wont need super-plane tow ing youll find flying easy no big surprises Although novice shouldnt try good Sunday pilot can easily Circling field 50 100 feet sign easy read scale appearance gets attention time Before get details let set stage rest article recommendations based 18 months experience using 19-powered conventional RC model towing signs 12 15 feet long 6h-in-high let ters tow signs comparable ones describe learn towing safe easy steps Im confident youll have success Design Concepts Lets talk first about design requirements sign Obviously should light strong low drag towline towing bridle connecting lines needed make letters follow along order letters need stifleners leading edges theyll keep shapes balance weights bot tom edges sign will trail vertically lay over its side What isnt obvious need something minimize sign flutter know flag flutters breeze Well sign long slender flag would flutter grand scale except four simple things drag aft end tugs sign out straight letters flexible weight kept minimum balance weights used behind last letter sign factors pay off two ways aerodynamic forces expend themselves harmlessly fluttering trailing edges letters drag Reducing weight especially aft end prevents sign playing crack-the-whip normal small amount flutter does oc cur Dont surprised see little flut ter especially aft one-fourth sign real ones too 44 Model Aviation RC Towplane towplane se lect should will take off quickly climb rapidly fly slowly good stability TABLE 1 MATERIALS LIST Fabric polyester-cotton broadcloth Sequins 14 diameter Thread Talon Button & Carpet Extra Strong Bamboo 3/64 1/16 square 8 lengths Monofilament fishing line 4-pound test Lead split-shot weights size 3/0 about 3/16 diameter Swivel-snap size 5 Steel rings 3/8 diameter Releasable towhook EK Logictrol Stock No THR-1 Flexible servo cable braided metal Solder coreless 1/8 diameter Soft iron wire 1/32 diameter 1 The authors towplane high-lift design 580 sq powered veco 19 9/4 prop tows signs up 34 lettersabout 15 ft long Local club has used 25-powered Quick Stick 40-powered Sweet Stick 60-powered Aeromaster flown well below full throttle control have reserve power yond whats needed tow sign may want use lower pitch prop usual improve characteristics What type plane will work Ive pleasantly surprised find RC model can tow heck lot towplane photo 2 conventional high-lift design 580 sq powered standard Veco 19 turning 9/4 prop regularly tows signs up 34 letters length about 15 feet lifts sign off ground no struggle requires less full throttle maintain level flight Ive set limit 34 letters Ill have perform ance safety factor full sign full power can climb slowly up altitude signs have also towed three other planes club did job ease 25-powered QuickStick 40-powered Sweet-Stick 60-powered Aeromaster three slowed down well below full throttle maintain realistic airspeed circled field Sweet-Stick however has flown little faster desirable maintain safe control So can tow sign also drop before landing plane will need re leasable towhook should located bottom fuselage near cen ter gravity possible EK Logic trol hook does excellent job photo 3 shows mockup installation sim ple metal guard added front hook prevents towline falling off hook preparing takeoff light spring also added keep hook locked position until servo releases it How actuate towhook release servo will depend setup plane select ingenuity Since plane uses three channels use throttle servo bringing throttle full idle moves pushrod unlock towhook Towing Sign two methods lifting sign off ground both used LOCATE CONNECTOR LINE ALONG HERE LOCATE CONNECTOR POLE HERE LOCASE CCTITS2TC LINE /16 4 41/4 4 21/32 ASSENBLY BOARD LAYOUT Fig 1 Ij j II II LOCATE CONNECTOR LOOPS AT ONE OF THESE SEVEN DISTANCES SELECT DISTANCE B FROTI TLE 2 FOR THE LETTER BEING ASS~LED ALONG 4 13/16 5 1/in 5 7/16 DISTANCE B 111 1 I I December 1977 45 6 1 ~1 3 An EK releasable hook used towing allows dropping sign before landing three-channel system author used throttle servo release full idle moves pushrod unlock towhook 4 Before takeoff sign stretched out along takeoft path tew teet ott tne sloe ito avoio snagging gear aruurIi e forward connect towhook least 4 feet air passes over front sign steady climb plane will peel sign off ground 4-lb test monofilament line nylon rope pic visibility 36 40 ft long 46 Model Aviation 2 Basic elements sign front end left bridle towline right drag letters interchangeable 5 mockup photo portrays installation towhook b xternaI view ot tne TownooK drophook installation cable drophook drophook used lift sign aerial pickup release drophook clearly visible servos set lock used see text description rather tow takeoff both hooks Balsa spool pic 5 unwinds drophook cord 7 The drophook shaped soft iron wire must have no sharp projections Just enough solder added give little weight positive drop Note hole braided release cable engages old-timers still used today Either way interesting challenge RC pilot because realism both exciting spectators watch first method youll lift sign off ground plane takes off climbs out Start placing plane takeoff position Stretch sign out di rectly along takeoff path front sign nearest plane See photo 4 Connect monofilament towline bridle sign run free end line back plane straight back lays along takeoff path might catch landing gear horizontal stabilizer during takeoff So lay about 3 4 feet off side takeoff path bring around behind plane run up forward con nect towhook long should towline Just long enough plane can take off least 4 feet air passes over front sign steady normal climb As plane continues its climb sign will peel off ground follow along way sign never drags across ground Make towline 4-lb test monofilament tie 3/t-in towring end After gain experi ence youll want towline short good judgment will allow realis tic appearance plane requires 36- 45-ft towline length depends wind affects takeoff Make takeoffs wind sign gets kite-like lift during first few moments lift-off until starts trailing vertically considerably eases bur den towplane After climb-out regulate power airspeed fly slow path around field Use distances Dist WDist D 13/16 13/16 3 1/2 1 3/16 1 1/2 3 7/8 4 1/4 4 1/4 411/16 115/16 2 3/4 4 1/4 4 2 1/32 421/32 4 2 1/32 4 21/32 413/16 5 1/16 5 7/16 characters apostrophe Colon E F J L Space Period comma Dash B D N 0 P Q R U 2356789 T V X Y 4 C G H K S Z $ M W Note All dimensions inches characters except small punctuation marks 6 1/4 high characters have 1 3/16 stroke December 1977 47 8 Rig aerial pickup consists two 8-ft bamboo poles set about eight feet apart Drophook released circling field plane flown about 4 feet above pickup loop top poles Tie scraps bright colored cloth loop drophook visibility TABLE 2 CHARACTER DIMENSIONS nere planeout picture rlgntnas snaggea pickup ioop ax moaerame speea gone high-power climbout sign has begun peel off ground author right concentrates control 4-lb line will break hook something mistake 50 100 feet Fly just fast enough keep sign tugged out straight main tain safe controllable airspeed plane Flying too fast easy will appear unrealistic cause undue sign flutter Since letter flutters like miniature flag continuous high airspeed can eventually damage sign As might expect towing load like plane will fly slower given power setting therefore respond slowly control movements ever because towline attached center gravity plane should have positive control response no unusual flight characteristics speak towing load Im referring drag cre ated sign its weight com plete 30-letter sign including bridle drag weighs about 4 ounces weight little significance Dropping sign simple just actuate towhook release sign will drop gently ground no damage Now have doubts about self plane trying heres safe easy way first few flights tow word get feel system method try two words three etc making several flights stage until towing full sign prepared abort tow time plane sign doesnt have way want Just drop sign think over later time crease load climb up safe altitude check planes performance control response progressing slowly like youll accomplish two things 1 youll develop full confidence yourself plane 2 youll find out long sign plane can safely tow second method lift-off extra equipment required optional requires precise flying dont hesitate try itits fun method youll fly plane over sign pick up trailing drophook Youll need 13 assemble letter parts laid Out shown assembly board layout Use aliphatic glue like Titebond Household Cement Ambroid etc. will curl up fabric make too rigid See text 48 Model Aviation 10 Sign towing has its special language Shown terms will using materials need listed Table 1 11 plentiful supply pre-cut bamboo oriental wall hangings found import shops department stores Other items found fishing tackle counter fabric store hobby shop 12 Preparing materials make character Also see Fig 11 Shown bamboo strips connector pole stiffeners two connector linesbutton carpet thread pieces about 10 long same towhook before youll also need drophook towline release mechanism shown photos 5 6 7 towline run 10-ft length monofila ment through center rectangular balsa spool Tie towring top end drophook bottom end Make drophook soft iron wire has no sharp projections just enough solder give little weight store line flight keep tangling wrap snugly around spool place spool hook hook-housing Put towring towhook set servos secure towhook drophook place prior flight braided throttle cable shown works fine drophook release As before Ill leave design servo action needed release drophook Photo 8 shows rig sign pickup Set up two 8-ft bamboo poles about 8 feet apart Beforehand make small vee-notch tip pole Lay sign out along flight path did first method towing bridle centered between poles make 24-ft monofilament line pickup loop Connect both ends line bridle lay loop formed across top two notched poles Last tie piece bright-colored yarn center loop another piece end drophook make visible Take off release drophook circling field As falls towline will unwind balsa spool until fully extended Since airstream will make trail back angle hook will about 8 feet below plane Guide plane moderate speed fly about 4 feet above center poles Just plane reaches poles apply full throttle establish normal climb did everything right drophook will catch pickup loop sign will gently peel off ground photo 9 didnt can always circle around try again dimensions given total towline will 22 feet long drophook line 10 feet pickup loop stretches out 12 feet length gives realistic appearance longer towline may need takeoff method Now understand sign picked up consider two precautions Use 4-lb test monofilamentif hook something mistake youll glad breaks Dont plant poles too firmly ground Can guess Now can tow sign dont recom mend novice dont think have expert pattern-pilot either best advice can fly plane vice versa can make plane go want what want can tow sign Sign Construction First check terms well using shown photo 10 materials youll need listed Ta ble 1 quantities arent specified since will depend letters tend make fabric store fishing tackle counter favorite hobby shop will supply needs except photo 11 reveals can find plentiful supply pre-cut bam boo oriental wall-hangings can find import shops department stores quality size strips vary somewhat after cull out December1977 49 14 Four steps forming connector end connector pole R Retainer sequins forced over bamboo connector pole shish kebab style Drill hole piece hardwood handy tool 15 character has connector pole front connector loops back Strip bamboo stiffens edge leading edge characterexcept commas etcrequire balance weight bottom 16 same principles applied characters whether letters numerals punctuation marks spaces between char acters nothing two connector lines connector pole 17 towing bridle must rugged because takes full brunt towing load Note strip solder wrapped around bottom bridle connector pole front sign trails vertically rest follows bad ones youll have toughest materials going Use strips about 3/64 1/16-in square slight variations wont hurt Now about shape letters Space wont permit drawing out whole alphabet plenty reference books However recommend using Gothic style letters shown Theyre boxy enough simple make yet have some eye-appeal easy read Also Id like recommend some basic proportions sizes letters will provide weight drag similar have tested Table 2 can see characters except small punctuation marks 6-in high have 1-3/16-in stroke will probably know letters same width spacing between different combinations letters varies give pleasing appearance Table 2 distances W D provided pur pose Once youve designed letters around basic proportions draw out 5 X 8 card can used template punch tiny holes card lines forming letters intersect Lay template fabric line edge card up fabric grain push felt-tipped pen through hole provide points outlining letter As cut letter out handle raw edges care prevent raveling Youll read later prevent finished letter Next youll need prepare simple assembly-board hold pieces let ter place glue together Fig 1 shows lay out piece ply wood Any letters numbers punc tuation marks can assembled scheme difference being locate connector loops establish distance D character making Photo 12 shows next step preparing materials make letter Cut out letter want start select bamboo strips connector pole stiffeners Next prepare two connector lines cut piece button capret thread about 10 long Form connector loop tying snugly around scrap Nyrod tubing slightly smaller diameter se quins used form connector see photo 14 A-in diameter sequins 3/16-in diameter Nyrod works out just right Apply drop glue knot before trimming off excess thread Make sure glue doesnt penetrate loop itself because loop should remain soft limber photos 12 14 can see loops connectors form simple connections between letters con necting letters together 1oop will stretch out oval shape slide over con nector easily sign towed 1oop stretches out tightly remains secure its connector Disassembling letters equally simple suggest make up sample two 1oop connector make sure assemble easily yet secure subjected pull assemble letter lay parts out shown photo 13 Insert pins brads assembly-board establish distance D Table 2 would 4-21/32 number 8 shown being assem bled sure connector lines under slight equal tension apply slender bead blue along joints tween bamboo thread fabric Make sure glue joints complete keep narrow possible letter will remain flexible Use aliphatic glue like Titebond household Ambroid glue will curl up fabric also make too rigid Youll find helpful hold bamboo strips down heavy fishing weights glue dries Next use small paint brush coat Continued page 91 50 Model Aviation 18 An expanding file provides handy storage keeps letters unwrinkled Authors kit contain 106 characters including five commonly used letters assembles sign field 15 minutes must have lost frequency pin club project qualify several pilots airplanes WHEELS RO WHEELS Smooth inflatable wheels big airplanes Features two piece bolt gether hubs hub caps Wheels can inflated deflated thru tiny valve side tire pressure de sire Truly remark able realistic looking wheel I$795 Pair 450R4-1 /2 Diameter995 Pair SOOR 5 Diameter11 95 Pair 550R5-1 /2 Diameter1 395 Pair 600R ameter1 595 Pair Low bounce shock absorbing wheels featuring 6 spoke dura hub finest quality hand inspected 175Tor RWheels 1-3/4$219 Pair 200 T RWheels 2239 Pair 225 T R SWheels 2-1/4259 Pair 250 T R SWheels 2-1/2279 Pair 275 T R 5Wheels 2-3/4299 Pair 300 T R 5Wheels 3319 Pair 325 T RWheels 3-1 /4339 Pair 350 T RWheels 3-1/2359 Pair DUBRO PRODUCTS INCORPORATED 480 BONNER ROAD WAUCONDA ILL 60084 total duration 75623 Fortunately FAI Sporting Code states explicitly required seaplanes land water So new record record-setting plane tree top Glenn Scillian went get help friends area spied ropes holding up canopy ropes hatchet John Tallmans car plunged through poison ivy base plane-eating tree climbed tree attacked offending branches After long exhausting work Shark fell stages ground delighted find damage minimal Lots fuel left later measure ment showed 35 fi oz 42% origi nal fuel remained tanks enough additional 5 hours same rate fuel usage longer leaner mixture ligher model ever records made actual rather potential performance Surpassing German record 25% quite satis fying result Special thanks order official witnesses some took day va cation leave help Friday lake busy Particular recognition due invisible Kenny Greenhouse Long ago Kenny assigned role documenting record attempts camera have never picture record articles Thanks also Dean Smith Lee Shiflett supplied critical parts flight Record setting exciting re warding activity doesnt require weekly travel follow contest circuit yet can compete entire world Opti mizing element modelair frame engine fuel system other componentsis necessary succeed Originality needed since wont find standardized approaches seen nor mal competition Free flight neglected area USA has 27 outdoor free flight records nearly held eastern European countries Control line radio control also have room improved performances Lets get going Tow Signs/Layers continued page 50 remaining raw fabric edges aliphatic glue has thinned 50-50 water Coat just /8-in margin fab ric will effectively stop edges raveling yet leave letter flexi ble After glue dry remove letter board trim off excess thread rough fabric edges part stiffener extends beyond edge letter Leave connector pole extra long now Photo 14 shows steps forming connector end connector pole Notice letters square front corners must have fabric cut out slight ly area Slip two sequins place leaving 1/16 3/32 between Although hole sequins small can forced over bamboo easily shish kebab style scrap ply wood hole makes fine tool push trim off bamboo leaving about 1/32 projecting form good glue joint Now glue sequins place epoxy sure form complete fillet epoxy between bamboo sequin surfaces As form inboard fillet let epoxy cover joint between connector line thread connector pole reinforcement junction pole sequins thread must good strong since entire towing load concentrated point last step letter finished Slide split-shot weight place photo 14 squeeze tightly fastened over both connector line thread fabric Youll have trim fabric edge back little get weight right position shapes other characters vary illustrated construc tion principles same charac ter has connector pole front connector loops back strip bamboo stiffens edge lead ing edge character needs balance December1977 91 WHOLE NEW LINE OF SMOOTH INFLATABLE BIG WHEELS 4 4Y 5 51h& 6 TREAD T SMOOTH R SLICKS 5 2 KITS e PLANS ACCESSORIES 1417 ME 17W SPAN STOCK NO PP 15 KIT $425 4 WALNUT SCALE KITS RART ACE$425 PEANUT SCALE KITS J3 CUE$329 PIREENPOL$329 MILES$329 TURRULENT$329 MUSTANG$349 ZERO$349 COUGAR$349 AIIIDREASOId$349 GIPSY MOTH$349 GANAGORIE$349 SPORT MODEL KITS ONE NITE 28$475 ONE NITE 16$349 STRINGLESS WONDER$249 PEcK ROD$139 KITS 0 PLANS S ACCESSORIES REAL JAPANESE TISSUEPROPS COMPLETE CATALOG 50 MANY HARD TO FIND ITEMS pP 0 BOX 2498 -AMALA MESA CAUF 92041 WPHONE 7141 4694675 17141 4424636 weight except very light ones such letter comma space Look over various photos especially photos 15 16 youll see principles applied entire alpha bet numbers punctuation marks Youll see too space nothing two connector lines connector pole Making letter takes little time reading about making lots sounds tedious lay out Fig 1 pattern ten places sheet plywood can assembly-line project making several time simplicity drag shown photo 17 assembly methods same four fingers formed cut ting slits drag better job re ducing flutter solid piece fabric Incidentally Ive tried variety drag de signs including U-shaped type used real signs Although shown doesnt provide scale appearance does best job sure coat raw fabric edges thinned-out glue dont put bal ance weight drag towing bridle also shown photo 17 must rugged because takes full brunt towing load Use monofila ment bridle rather thread use heavier bamboo dowel about 3/32 diameter pole Tie monofil ament swivel-snap 2 di mension wont change tie end pole After can form connector loops about 1 hind pole Epoxy monofilament pole epoxy knots too Wrap 4 inches A-in solder around bottom pole balance weight get front sign trail verti cally rest sign inclined same Now letters numbers punctuation marks will need Heres easy way find own answer Plan first sign message youll want tow regularly Mine read JOIN THE PALM BEACH SKYHAWKS TODAY provides beginning letter inventory lets start fly ing soon possible invent new messages tow build addi tional characters need way can build inventory over long period time yet enjoy towing signs youre doing field kit photo 18 contains 106 characters has five commonly used letters fewer others expanding file shown provides handy storage keeps letters un wrinkled Come think have 107 last Santa-in-a-sleigh towed front Merry Christmas sign suggest keep written inventory characters have time plan message can check quickly see have enough As Ns Ts etc make plan sign find lack certain letters complete stop think slight rewording might put idea across letters have STATEMENT OF OWNERS*41P MANAGEMENT AND CIRCULATION Rrqojred 39 USC 3683 1 TeIeoIPc6lisssion MODELAVIATION A PaIIuetofl No. 067930 2 Date ol Filing Sepseonben 13 1577 3 Frequency 01 sue Monthly A No01 Sues Publtehed Annually 12 8 Annual Sattcnipnon Prico Sn20G 4 Location 01 known OlIton 01 putaication street city county stale ZIP code pnnnnrsl 815 FIteenttn Sn NW Weahiognon DC 2008h 5 Location headquarters aecerel business offices publishers Non printers 815 Fitneensh St. NW Weshinston DC 211015 6 Names connplens addrinses Publisher Editor Monesins Editor PutnlelnOr Gel S Whenlen 015 Fjtteanth Sn. NW Washinason DC 20605 Editor Wlliaen 3 Winner 8th Ftneennh Sn. NW Wsshington DC 20006 Managing Edsor NONE 7Owner Acscssecyol Model Aeronautios81h Fmfttenth Sn. NW Washington DC 206155 8Know bondltolders wor69gees Other tacOriny holders owning hold jog n% went total amount 01 bonds orornns Othpr securities NONE S For coenpienmon nonptotit organicotions authorized snail spocial rates Igoonror 132n22 PSMI Tbn purpose lunction end nonprolit status nhs orOenjeeton tuempn status Icr Foderal incowe too ponprees ham non changed during preceding 12 moonhe Ecoent cod Nalorr Cnculation nIl Actual Acerageno copies no copies01 tiOgir eachissueissue duriogoublished prenadingnearest l2nlectheillingdane ATotal No COpes Printed Net Press Ron3703530106 BPard Ciroulation 1 Sales lhruuoh Dealers end Carriers SIrens Veodurs end Counter Sales23742306 2Mail Subtonrytross2911732d1S CTotal Paid Circulanmoo31 49135211 0Frco Djsgnibullun Mel Carrier Other Meaos Samylns Complmennary Other Finn Copres360621 30 ETotal Distribution Suns C cod Dl3517737341 FCopies No Dtnributerl 1Oltise Usc LOttOmr Unacoocoted Seciled eltor Printing10691750 2Returns row New Agente UTotal Sum E Fl end 2should equal press run show Al3703h39106 11 I certify stagrorennO made abum ore correct complete CARL S WFIEE LET Publisher Big Day Arrives Okay now youre ready try signs first time some final thoughts remind ers get field youll find takes 15 minutes assemble full sign decide make up night before flying youll pleased learn complete sign folds neatly shoe box room left lunch sure keep signs dry make sure grass isnt damp lay out fabric would soak up moisture like blotter youd never get off ground Using item start lets make up checklist precautions first few flights 1 Keep signs dry 2 Before takeoff check sign sure connectors secure wind flips sign about check again 3 Do test flying easy stages first word two 4 Keep spectators off side make pass drophook trail ing 5 Make sign lift-offs wind make normal climb-outs 6 During lift-off keep eyes tention plane Dont worry about signit will follow along has no other choice 7 Be prepared drop sign en gine falters especially during lift-off climb-out 8 Maintain performance safety factor never towing sign long cant climb plane altitude 9 Abide field safety rules usual Youll tempted tow sign right over crowd dont End Well thats build em thats tow em hope readers will try because its chal lenging yet useful project Also might want look prospects making club project parcel out work making kit letters qualif several planes pilots towing So last 33 letters Ill close saying TRY TOWING YOUR OWN SIGNSITSALOTTA FUN Lets see now takes 5 Ts 2 Rs 2 Ys 4 0s tographs article made Lee Boozer Jimmy Zeak Chuck Stevens Emilic Fuente Bill Layers members Palm Beach Sky hawks Engine Technique/Jehlik continued page 51 surplus metal ammo box about 14 X 18 X 20 can store running equipment box Tank I prefer round RC klunk tank mounted auto hose clamp screwed top box Tank filler Anything squeeze bulb 92 Model Aviation FLY wITM R95511 eWUR 69tet 0 WALNUT SCALE ASK POE OUR KITS AND ACCESSORIES Al YOUR LOCAL DEALER IF NOT AVAILARLE AT YOUR DEALER ORDER DIRECT ADD 60 POSTAGE BROWN CO-2 ENGINES ENGINES ARE IN STOCK NEW CHARGER AND S SIZES OF TANKS RROWN ENGINES MUST RE ORDERED DIRECT FROM PECK-POLYMERS
Edition: Model Aviation - 1977/12
Page Numbers: 44, 45, 46, 47, 48, 49, 50, 91, 92
HOW WOULD YOU like tow variety signs next fun-fly First might assemble says BOMB DROP EVENT STARTS PROMPTLY AT 9 AM next message rib friends PLEASE REPLACE DI VOT AFTER EACH LANDING later reads DONT FORGET ELECTION NEXT MEETING Does raise lot questions hope because youre interested Id like tell you can make own fieldkit interchangeable letters tow just about sign want Heres project nutshell Youll make up individual characters letters numbers punctuation marks too want simple materials using conventional methods Youll make bridle towline front sign thing called drag back photo 1 Youll install releasable towhook bottom plane servo system operate big day arrives youll select letters need message connect together simply just few minutes youre ready go surprisingly youll find whole rig almost inde structible wont need super-plane tow ing youll find flying easy no big surprises Although novice shouldnt try good Sunday pilot can easily Circling field 50 100 feet sign easy read scale appearance gets attention time Before get details let set stage rest article recommendations based 18 months experience using 19-powered conventional RC model towing signs 12 15 feet long 6h-in-high let ters tow signs comparable ones describe learn towing safe easy steps Im confident youll have success Design Concepts Lets talk first about design requirements sign Obviously should light strong low drag towline towing bridle connecting lines needed make letters follow along order letters need stifleners leading edges theyll keep shapes balance weights bot tom edges sign will trail vertically lay over its side What isnt obvious need something minimize sign flutter know flag flutters breeze Well sign long slender flag would flutter grand scale except four simple things drag aft end tugs sign out straight letters flexible weight kept minimum balance weights used behind last letter sign factors pay off two ways aerodynamic forces expend themselves harmlessly fluttering trailing edges letters drag Reducing weight especially aft end prevents sign playing crack-the-whip normal small amount flutter does oc cur Dont surprised see little flut ter especially aft one-fourth sign real ones too 44 Model Aviation RC Towplane towplane se lect should will take off quickly climb rapidly fly slowly good stability TABLE 1 MATERIALS LIST Fabric polyester-cotton broadcloth Sequins 14 diameter Thread Talon Button & Carpet Extra Strong Bamboo 3/64 1/16 square 8 lengths Monofilament fishing line 4-pound test Lead split-shot weights size 3/0 about 3/16 diameter Swivel-snap size 5 Steel rings 3/8 diameter Releasable towhook EK Logictrol Stock No THR-1 Flexible servo cable braided metal Solder coreless 1/8 diameter Soft iron wire 1/32 diameter 1 The authors towplane high-lift design 580 sq powered veco 19 9/4 prop tows signs up 34 lettersabout 15 ft long Local club has used 25-powered Quick Stick 40-powered Sweet Stick 60-powered Aeromaster flown well below full throttle control have reserve power yond whats needed tow sign may want use lower pitch prop usual improve characteristics What type plane will work Ive pleasantly surprised find RC model can tow heck lot towplane photo 2 conventional high-lift design 580 sq powered standard Veco 19 turning 9/4 prop regularly tows signs up 34 letters length about 15 feet lifts sign off ground no struggle requires less full throttle maintain level flight Ive set limit 34 letters Ill have perform ance safety factor full sign full power can climb slowly up altitude signs have also towed three other planes club did job ease 25-powered QuickStick 40-powered Sweet-Stick 60-powered Aeromaster three slowed down well below full throttle maintain realistic airspeed circled field Sweet-Stick however has flown little faster desirable maintain safe control So can tow sign also drop before landing plane will need re leasable towhook should located bottom fuselage near cen ter gravity possible EK Logic trol hook does excellent job photo 3 shows mockup installation sim ple metal guard added front hook prevents towline falling off hook preparing takeoff light spring also added keep hook locked position until servo releases it How actuate towhook release servo will depend setup plane select ingenuity Since plane uses three channels use throttle servo bringing throttle full idle moves pushrod unlock towhook Towing Sign two methods lifting sign off ground both used LOCATE CONNECTOR LINE ALONG HERE LOCATE CONNECTOR POLE HERE LOCASE CCTITS2TC LINE /16 4 41/4 4 21/32 ASSENBLY BOARD LAYOUT Fig 1 Ij j II II LOCATE CONNECTOR LOOPS AT ONE OF THESE SEVEN DISTANCES SELECT DISTANCE B FROTI TLE 2 FOR THE LETTER BEING ASS~LED ALONG 4 13/16 5 1/in 5 7/16 DISTANCE B 111 1 I I December 1977 45 6 1 ~1 3 An EK releasable hook used towing allows dropping sign before landing three-channel system author used throttle servo release full idle moves pushrod unlock towhook 4 Before takeoff sign stretched out along takeoft path tew teet ott tne sloe ito avoio snagging gear aruurIi e forward connect towhook least 4 feet air passes over front sign steady climb plane will peel sign off ground 4-lb test monofilament line nylon rope pic visibility 36 40 ft long 46 Model Aviation 2 Basic elements sign front end left bridle towline right drag letters interchangeable 5 mockup photo portrays installation towhook b xternaI view ot tne TownooK drophook installation cable drophook drophook used lift sign aerial pickup release drophook clearly visible servos set lock used see text description rather tow takeoff both hooks Balsa spool pic 5 unwinds drophook cord 7 The drophook shaped soft iron wire must have no sharp projections Just enough solder added give little weight positive drop Note hole braided release cable engages old-timers still used today Either way interesting challenge RC pilot because realism both exciting spectators watch first method youll lift sign off ground plane takes off climbs out Start placing plane takeoff position Stretch sign out di rectly along takeoff path front sign nearest plane See photo 4 Connect monofilament towline bridle sign run free end line back plane straight back lays along takeoff path might catch landing gear horizontal stabilizer during takeoff So lay about 3 4 feet off side takeoff path bring around behind plane run up forward con nect towhook long should towline Just long enough plane can take off least 4 feet air passes over front sign steady normal climb As plane continues its climb sign will peel off ground follow along way sign never drags across ground Make towline 4-lb test monofilament tie 3/t-in towring end After gain experi ence youll want towline short good judgment will allow realis tic appearance plane requires 36- 45-ft towline length depends wind affects takeoff Make takeoffs wind sign gets kite-like lift during first few moments lift-off until starts trailing vertically considerably eases bur den towplane After climb-out regulate power airspeed fly slow path around field Use distances Dist WDist D 13/16 13/16 3 1/2 1 3/16 1 1/2 3 7/8 4 1/4 4 1/4 411/16 115/16 2 3/4 4 1/4 4 2 1/32 421/32 4 2 1/32 4 21/32 413/16 5 1/16 5 7/16 characters apostrophe Colon E F J L Space Period comma Dash B D N 0 P Q R U 2356789 T V X Y 4 C G H K S Z $ M W Note All dimensions inches characters except small punctuation marks 6 1/4 high characters have 1 3/16 stroke December 1977 47 8 Rig aerial pickup consists two 8-ft bamboo poles set about eight feet apart Drophook released circling field plane flown about 4 feet above pickup loop top poles Tie scraps bright colored cloth loop drophook visibility TABLE 2 CHARACTER DIMENSIONS nere planeout picture rlgntnas snaggea pickup ioop ax moaerame speea gone high-power climbout sign has begun peel off ground author right concentrates control 4-lb line will break hook something mistake 50 100 feet Fly just fast enough keep sign tugged out straight main tain safe controllable airspeed plane Flying too fast easy will appear unrealistic cause undue sign flutter Since letter flutters like miniature flag continuous high airspeed can eventually damage sign As might expect towing load like plane will fly slower given power setting therefore respond slowly control movements ever because towline attached center gravity plane should have positive control response no unusual flight characteristics speak towing load Im referring drag cre ated sign its weight com plete 30-letter sign including bridle drag weighs about 4 ounces weight little significance Dropping sign simple just actuate towhook release sign will drop gently ground no damage Now have doubts about self plane trying heres safe easy way first few flights tow word get feel system method try two words three etc making several flights stage until towing full sign prepared abort tow time plane sign doesnt have way want Just drop sign think over later time crease load climb up safe altitude check planes performance control response progressing slowly like youll accomplish two things 1 youll develop full confidence yourself plane 2 youll find out long sign plane can safely tow second method lift-off extra equipment required optional requires precise flying dont hesitate try itits fun method youll fly plane over sign pick up trailing drophook Youll need 13 assemble letter parts laid Out shown assembly board layout Use aliphatic glue like Titebond Household Cement Ambroid etc. will curl up fabric make too rigid See text 48 Model Aviation 10 Sign towing has its special language Shown terms will using materials need listed Table 1 11 plentiful supply pre-cut bamboo oriental wall hangings found import shops department stores Other items found fishing tackle counter fabric store hobby shop 12 Preparing materials make character Also see Fig 11 Shown bamboo strips connector pole stiffeners two connector linesbutton carpet thread pieces about 10 long same towhook before youll also need drophook towline release mechanism shown photos 5 6 7 towline run 10-ft length monofila ment through center rectangular balsa spool Tie towring top end drophook bottom end Make drophook soft iron wire has no sharp projections just enough solder give little weight store line flight keep tangling wrap snugly around spool place spool hook hook-housing Put towring towhook set servos secure towhook drophook place prior flight braided throttle cable shown works fine drophook release As before Ill leave design servo action needed release drophook Photo 8 shows rig sign pickup Set up two 8-ft bamboo poles about 8 feet apart Beforehand make small vee-notch tip pole Lay sign out along flight path did first method towing bridle centered between poles make 24-ft monofilament line pickup loop Connect both ends line bridle lay loop formed across top two notched poles Last tie piece bright-colored yarn center loop another piece end drophook make visible Take off release drophook circling field As falls towline will unwind balsa spool until fully extended Since airstream will make trail back angle hook will about 8 feet below plane Guide plane moderate speed fly about 4 feet above center poles Just plane reaches poles apply full throttle establish normal climb did everything right drophook will catch pickup loop sign will gently peel off ground photo 9 didnt can always circle around try again dimensions given total towline will 22 feet long drophook line 10 feet pickup loop stretches out 12 feet length gives realistic appearance longer towline may need takeoff method Now understand sign picked up consider two precautions Use 4-lb test monofilamentif hook something mistake youll glad breaks Dont plant poles too firmly ground Can guess Now can tow sign dont recom mend novice dont think have expert pattern-pilot either best advice can fly plane vice versa can make plane go want what want can tow sign Sign Construction First check terms well using shown photo 10 materials youll need listed Ta ble 1 quantities arent specified since will depend letters tend make fabric store fishing tackle counter favorite hobby shop will supply needs except photo 11 reveals can find plentiful supply pre-cut bam boo oriental wall-hangings can find import shops department stores quality size strips vary somewhat after cull out December1977 49 14 Four steps forming connector end connector pole R Retainer sequins forced over bamboo connector pole shish kebab style Drill hole piece hardwood handy tool 15 character has connector pole front connector loops back Strip bamboo stiffens edge leading edge characterexcept commas etcrequire balance weight bottom 16 same principles applied characters whether letters numerals punctuation marks spaces between char acters nothing two connector lines connector pole 17 towing bridle must rugged because takes full brunt towing load Note strip solder wrapped around bottom bridle connector pole front sign trails vertically rest follows bad ones youll have toughest materials going Use strips about 3/64 1/16-in square slight variations wont hurt Now about shape letters Space wont permit drawing out whole alphabet plenty reference books However recommend using Gothic style letters shown Theyre boxy enough simple make yet have some eye-appeal easy read Also Id like recommend some basic proportions sizes letters will provide weight drag similar have tested Table 2 can see characters except small punctuation marks 6-in high have 1-3/16-in stroke will probably know letters same width spacing between different combinations letters varies give pleasing appearance Table 2 distances W D provided pur pose Once youve designed letters around basic proportions draw out 5 X 8 card can used template punch tiny holes card lines forming letters intersect Lay template fabric line edge card up fabric grain push felt-tipped pen through hole provide points outlining letter As cut letter out handle raw edges care prevent raveling Youll read later prevent finished letter Next youll need prepare simple assembly-board hold pieces let ter place glue together Fig 1 shows lay out piece ply wood Any letters numbers punc tuation marks can assembled scheme difference being locate connector loops establish distance D character making Photo 12 shows next step preparing materials make letter Cut out letter want start select bamboo strips connector pole stiffeners Next prepare two connector lines cut piece button capret thread about 10 long Form connector loop tying snugly around scrap Nyrod tubing slightly smaller diameter se quins used form connector see photo 14 A-in diameter sequins 3/16-in diameter Nyrod works out just right Apply drop glue knot before trimming off excess thread Make sure glue doesnt penetrate loop itself because loop should remain soft limber photos 12 14 can see loops connectors form simple connections between letters con necting letters together 1oop will stretch out oval shape slide over con nector easily sign towed 1oop stretches out tightly remains secure its connector Disassembling letters equally simple suggest make up sample two 1oop connector make sure assemble easily yet secure subjected pull assemble letter lay parts out shown photo 13 Insert pins brads assembly-board establish distance D Table 2 would 4-21/32 number 8 shown being assem bled sure connector lines under slight equal tension apply slender bead blue along joints tween bamboo thread fabric Make sure glue joints complete keep narrow possible letter will remain flexible Use aliphatic glue like Titebond household Ambroid glue will curl up fabric also make too rigid Youll find helpful hold bamboo strips down heavy fishing weights glue dries Next use small paint brush coat Continued page 91 50 Model Aviation 18 An expanding file provides handy storage keeps letters unwrinkled Authors kit contain 106 characters including five commonly used letters assembles sign field 15 minutes must have lost frequency pin club project qualify several pilots airplanes WHEELS RO WHEELS Smooth inflatable wheels big airplanes Features two piece bolt gether hubs hub caps Wheels can inflated deflated thru tiny valve side tire pressure de sire Truly remark able realistic looking wheel I$795 Pair 450R4-1 /2 Diameter995 Pair SOOR 5 Diameter11 95 Pair 550R5-1 /2 Diameter1 395 Pair 600R ameter1 595 Pair Low bounce shock absorbing wheels featuring 6 spoke dura hub finest quality hand inspected 175Tor RWheels 1-3/4$219 Pair 200 T RWheels 2239 Pair 225 T R SWheels 2-1/4259 Pair 250 T R SWheels 2-1/2279 Pair 275 T R 5Wheels 2-3/4299 Pair 300 T R 5Wheels 3319 Pair 325 T RWheels 3-1 /4339 Pair 350 T RWheels 3-1/2359 Pair DUBRO PRODUCTS INCORPORATED 480 BONNER ROAD WAUCONDA ILL 60084 total duration 75623 Fortunately FAI Sporting Code states explicitly required seaplanes land water So new record record-setting plane tree top Glenn Scillian went get help friends area spied ropes holding up canopy ropes hatchet John Tallmans car plunged through poison ivy base plane-eating tree climbed tree attacked offending branches After long exhausting work Shark fell stages ground delighted find damage minimal Lots fuel left later measure ment showed 35 fi oz 42% origi nal fuel remained tanks enough additional 5 hours same rate fuel usage longer leaner mixture ligher model ever records made actual rather potential performance Surpassing German record 25% quite satis fying result Special thanks order official witnesses some took day va cation leave help Friday lake busy Particular recognition due invisible Kenny Greenhouse Long ago Kenny assigned role documenting record attempts camera have never picture record articles Thanks also Dean Smith Lee Shiflett supplied critical parts flight Record setting exciting re warding activity doesnt require weekly travel follow contest circuit yet can compete entire world Opti mizing element modelair frame engine fuel system other componentsis necessary succeed Originality needed since wont find standardized approaches seen nor mal competition Free flight neglected area USA has 27 outdoor free flight records nearly held eastern European countries Control line radio control also have room improved performances Lets get going Tow Signs/Layers continued page 50 remaining raw fabric edges aliphatic glue has thinned 50-50 water Coat just /8-in margin fab ric will effectively stop edges raveling yet leave letter flexi ble After glue dry remove letter board trim off excess thread rough fabric edges part stiffener extends beyond edge letter Leave connector pole extra long now Photo 14 shows steps forming connector end connector pole Notice letters square front corners must have fabric cut out slight ly area Slip two sequins place leaving 1/16 3/32 between Although hole sequins small can forced over bamboo easily shish kebab style scrap ply wood hole makes fine tool push trim off bamboo leaving about 1/32 projecting form good glue joint Now glue sequins place epoxy sure form complete fillet epoxy between bamboo sequin surfaces As form inboard fillet let epoxy cover joint between connector line thread connector pole reinforcement junction pole sequins thread must good strong since entire towing load concentrated point last step letter finished Slide split-shot weight place photo 14 squeeze tightly fastened over both connector line thread fabric Youll have trim fabric edge back little get weight right position shapes other characters vary illustrated construc tion principles same charac ter has connector pole front connector loops back strip bamboo stiffens edge lead ing edge character needs balance December1977 91 WHOLE NEW LINE OF SMOOTH INFLATABLE BIG WHEELS 4 4Y 5 51h& 6 TREAD T SMOOTH R SLICKS 5 2 KITS e PLANS ACCESSORIES 1417 ME 17W SPAN STOCK NO PP 15 KIT $425 4 WALNUT SCALE KITS RART ACE$425 PEANUT SCALE KITS J3 CUE$329 PIREENPOL$329 MILES$329 TURRULENT$329 MUSTANG$349 ZERO$349 COUGAR$349 AIIIDREASOId$349 GIPSY MOTH$349 GANAGORIE$349 SPORT MODEL KITS ONE NITE 28$475 ONE NITE 16$349 STRINGLESS WONDER$249 PEcK ROD$139 KITS 0 PLANS S ACCESSORIES REAL JAPANESE TISSUEPROPS COMPLETE CATALOG 50 MANY HARD TO FIND ITEMS pP 0 BOX 2498 -AMALA MESA CAUF 92041 WPHONE 7141 4694675 17141 4424636 weight except very light ones such letter comma space Look over various photos especially photos 15 16 youll see principles applied entire alpha bet numbers punctuation marks Youll see too space nothing two connector lines connector pole Making letter takes little time reading about making lots sounds tedious lay out Fig 1 pattern ten places sheet plywood can assembly-line project making several time simplicity drag shown photo 17 assembly methods same four fingers formed cut ting slits drag better job re ducing flutter solid piece fabric Incidentally Ive tried variety drag de signs including U-shaped type used real signs Although shown doesnt provide scale appearance does best job sure coat raw fabric edges thinned-out glue dont put bal ance weight drag towing bridle also shown photo 17 must rugged because takes full brunt towing load Use monofila ment bridle rather thread use heavier bamboo dowel about 3/32 diameter pole Tie monofil ament swivel-snap 2 di mension wont change tie end pole After can form connector loops about 1 hind pole Epoxy monofilament pole epoxy knots too Wrap 4 inches A-in solder around bottom pole balance weight get front sign trail verti cally rest sign inclined same Now letters numbers punctuation marks will need Heres easy way find own answer Plan first sign message youll want tow regularly Mine read JOIN THE PALM BEACH SKYHAWKS TODAY provides beginning letter inventory lets start fly ing soon possible invent new messages tow build addi tional characters need way can build inventory over long period time yet enjoy towing signs youre doing field kit photo 18 contains 106 characters has five commonly used letters fewer others expanding file shown provides handy storage keeps letters un wrinkled Come think have 107 last Santa-in-a-sleigh towed front Merry Christmas sign suggest keep written inventory characters have time plan message can check quickly see have enough As Ns Ts etc make plan sign find lack certain letters complete stop think slight rewording might put idea across letters have STATEMENT OF OWNERS*41P MANAGEMENT AND CIRCULATION Rrqojred 39 USC 3683 1 TeIeoIPc6lisssion MODELAVIATION A PaIIuetofl No. 067930 2 Date ol Filing Sepseonben 13 1577 3 Frequency 01 sue Monthly A No01 Sues Publtehed Annually 12 8 Annual Sattcnipnon Prico Sn20G 4 Location 01 known OlIton 01 putaication street city county stale ZIP code pnnnnrsl 815 FIteenttn Sn NW Weahiognon DC 2008h 5 Location headquarters aecerel business offices publishers Non printers 815 Fitneensh St. NW Weshinston DC 211015 6 Names connplens addrinses Publisher Editor Monesins Editor PutnlelnOr Gel S Whenlen 015 Fjtteanth Sn. NW Washinason DC 20605 Editor Wlliaen 3 Winner 8th Ftneennh Sn. NW Wsshington DC 20006 Managing Edsor NONE 7Owner Acscssecyol Model Aeronautios81h Fmfttenth Sn. NW Washington DC 206155 8Know bondltolders wor69gees Other tacOriny holders owning hold jog n% went total amount 01 bonds orornns Othpr securities NONE S For coenpienmon nonptotit organicotions authorized snail spocial rates Igoonror 132n22 PSMI Tbn purpose lunction end nonprolit status nhs orOenjeeton tuempn status Icr Foderal incowe too ponprees ham non changed during preceding 12 moonhe Ecoent cod Nalorr Cnculation nIl Actual Acerageno copies no copies01 tiOgir eachissueissue duriogoublished prenadingnearest l2nlectheillingdane ATotal No COpes Printed Net Press Ron3703530106 BPard Ciroulation 1 Sales lhruuoh Dealers end Carriers SIrens Veodurs end Counter Sales23742306 2Mail Subtonrytross2911732d1S CTotal Paid Circulanmoo31 49135211 0Frco Djsgnibullun Mel Carrier Other Meaos Samylns Complmennary Other Finn Copres360621 30 ETotal Distribution Suns C cod Dl3517737341 FCopies No Dtnributerl 1Oltise Usc LOttOmr Unacoocoted Seciled eltor Printing10691750 2Returns row New Agente UTotal Sum E Fl end 2should equal press run show Al3703h39106 11 I certify stagrorennO made abum ore correct complete CARL S WFIEE LET Publisher Big Day Arrives Okay now youre ready try signs first time some final thoughts remind ers get field youll find takes 15 minutes assemble full sign decide make up night before flying youll pleased learn complete sign folds neatly shoe box room left lunch sure keep signs dry make sure grass isnt damp lay out fabric would soak up moisture like blotter youd never get off ground Using item start lets make up checklist precautions first few flights 1 Keep signs dry 2 Before takeoff check sign sure connectors secure wind flips sign about check again 3 Do test flying easy stages first word two 4 Keep spectators off side make pass drophook trail ing 5 Make sign lift-offs wind make normal climb-outs 6 During lift-off keep eyes tention plane Dont worry about signit will follow along has no other choice 7 Be prepared drop sign en gine falters especially during lift-off climb-out 8 Maintain performance safety factor never towing sign long cant climb plane altitude 9 Abide field safety rules usual Youll tempted tow sign right over crowd dont End Well thats build em thats tow em hope readers will try because its chal lenging yet useful project Also might want look prospects making club project parcel out work making kit letters qualif several planes pilots towing So last 33 letters Ill close saying TRY TOWING YOUR OWN SIGNSITSALOTTA FUN Lets see now takes 5 Ts 2 Rs 2 Ys 4 0s tographs article made Lee Boozer Jimmy Zeak Chuck Stevens Emilic Fuente Bill Layers members Palm Beach Sky hawks Engine Technique/Jehlik continued page 51 surplus metal ammo box about 14 X 18 X 20 can store running equipment box Tank I prefer round RC klunk tank mounted auto hose clamp screwed top box Tank filler Anything squeeze bulb 92 Model Aviation FLY wITM R95511 eWUR 69tet 0 WALNUT SCALE ASK POE OUR KITS AND ACCESSORIES Al YOUR LOCAL DEALER IF NOT AVAILARLE AT YOUR DEALER ORDER DIRECT ADD 60 POSTAGE BROWN CO-2 ENGINES ENGINES ARE IN STOCK NEW CHARGER AND S SIZES OF TANKS RROWN ENGINES MUST RE ORDERED DIRECT FROM PECK-POLYMERS
Edition: Model Aviation - 1977/12
Page Numbers: 44, 45, 46, 47, 48, 49, 50, 91, 92
HOW WOULD YOU like tow variety signs next fun-fly First might assemble says BOMB DROP EVENT STARTS PROMPTLY AT 9 AM next message rib friends PLEASE REPLACE DI VOT AFTER EACH LANDING later reads DONT FORGET ELECTION NEXT MEETING Does raise lot questions hope because youre interested Id like tell you can make own fieldkit interchangeable letters tow just about sign want Heres project nutshell Youll make up individual characters letters numbers punctuation marks too want simple materials using conventional methods Youll make bridle towline front sign thing called drag back photo 1 Youll install releasable towhook bottom plane servo system operate big day arrives youll select letters need message connect together simply just few minutes youre ready go surprisingly youll find whole rig almost inde structible wont need super-plane tow ing youll find flying easy no big surprises Although novice shouldnt try good Sunday pilot can easily Circling field 50 100 feet sign easy read scale appearance gets attention time Before get details let set stage rest article recommendations based 18 months experience using 19-powered conventional RC model towing signs 12 15 feet long 6h-in-high let ters tow signs comparable ones describe learn towing safe easy steps Im confident youll have success Design Concepts Lets talk first about design requirements sign Obviously should light strong low drag towline towing bridle connecting lines needed make letters follow along order letters need stifleners leading edges theyll keep shapes balance weights bot tom edges sign will trail vertically lay over its side What isnt obvious need something minimize sign flutter know flag flutters breeze Well sign long slender flag would flutter grand scale except four simple things drag aft end tugs sign out straight letters flexible weight kept minimum balance weights used behind last letter sign factors pay off two ways aerodynamic forces expend themselves harmlessly fluttering trailing edges letters drag Reducing weight especially aft end prevents sign playing crack-the-whip normal small amount flutter does oc cur Dont surprised see little flut ter especially aft one-fourth sign real ones too 44 Model Aviation RC Towplane towplane se lect should will take off quickly climb rapidly fly slowly good stability TABLE 1 MATERIALS LIST Fabric polyester-cotton broadcloth Sequins 14 diameter Thread Talon Button & Carpet Extra Strong Bamboo 3/64 1/16 square 8 lengths Monofilament fishing line 4-pound test Lead split-shot weights size 3/0 about 3/16 diameter Swivel-snap size 5 Steel rings 3/8 diameter Releasable towhook EK Logictrol Stock No THR-1 Flexible servo cable braided metal Solder coreless 1/8 diameter Soft iron wire 1/32 diameter 1 The authors towplane high-lift design 580 sq powered veco 19 9/4 prop tows signs up 34 lettersabout 15 ft long Local club has used 25-powered Quick Stick 40-powered Sweet Stick 60-powered Aeromaster flown well below full throttle control have reserve power yond whats needed tow sign may want use lower pitch prop usual improve characteristics What type plane will work Ive pleasantly surprised find RC model can tow heck lot towplane photo 2 conventional high-lift design 580 sq powered standard Veco 19 turning 9/4 prop regularly tows signs up 34 letters length about 15 feet lifts sign off ground no struggle requires less full throttle maintain level flight Ive set limit 34 letters Ill have perform ance safety factor full sign full power can climb slowly up altitude signs have also towed three other planes club did job ease 25-powered QuickStick 40-powered Sweet-Stick 60-powered Aeromaster three slowed down well below full throttle maintain realistic airspeed circled field Sweet-Stick however has flown little faster desirable maintain safe control So can tow sign also drop before landing plane will need re leasable towhook should located bottom fuselage near cen ter gravity possible EK Logic trol hook does excellent job photo 3 shows mockup installation sim ple metal guard added front hook prevents towline falling off hook preparing takeoff light spring also added keep hook locked position until servo releases it How actuate towhook release servo will depend setup plane select ingenuity Since plane uses three channels use throttle servo bringing throttle full idle moves pushrod unlock towhook Towing Sign two methods lifting sign off ground both used LOCATE CONNECTOR LINE ALONG HERE LOCATE CONNECTOR POLE HERE LOCASE CCTITS2TC LINE /16 4 41/4 4 21/32 ASSENBLY BOARD LAYOUT Fig 1 Ij j II II LOCATE CONNECTOR LOOPS AT ONE OF THESE SEVEN DISTANCES SELECT DISTANCE B FROTI TLE 2 FOR THE LETTER BEING ASS~LED ALONG 4 13/16 5 1/in 5 7/16 DISTANCE B 111 1 I I December 1977 45 6 1 ~1 3 An EK releasable hook used towing allows dropping sign before landing three-channel system author used throttle servo release full idle moves pushrod unlock towhook 4 Before takeoff sign stretched out along takeoft path tew teet ott tne sloe ito avoio snagging gear aruurIi e forward connect towhook least 4 feet air passes over front sign steady climb plane will peel sign off ground 4-lb test monofilament line nylon rope pic visibility 36 40 ft long 46 Model Aviation 2 Basic elements sign front end left bridle towline right drag letters interchangeable 5 mockup photo portrays installation towhook b xternaI view ot tne TownooK drophook installation cable drophook drophook used lift sign aerial pickup release drophook clearly visible servos set lock used see text description rather tow takeoff both hooks Balsa spool pic 5 unwinds drophook cord 7 The drophook shaped soft iron wire must have no sharp projections Just enough solder added give little weight positive drop Note hole braided release cable engages old-timers still used today Either way interesting challenge RC pilot because realism both exciting spectators watch first method youll lift sign off ground plane takes off climbs out Start placing plane takeoff position Stretch sign out di rectly along takeoff path front sign nearest plane See photo 4 Connect monofilament towline bridle sign run free end line back plane straight back lays along takeoff path might catch landing gear horizontal stabilizer during takeoff So lay about 3 4 feet off side takeoff path bring around behind plane run up forward con nect towhook long should towline Just long enough plane can take off least 4 feet air passes over front sign steady normal climb As plane continues its climb sign will peel off ground follow along way sign never drags across ground Make towline 4-lb test monofilament tie 3/t-in towring end After gain experi ence youll want towline short good judgment will allow realis tic appearance plane requires 36- 45-ft towline length depends wind affects takeoff Make takeoffs wind sign gets kite-like lift during first few moments lift-off until starts trailing vertically considerably eases bur den towplane After climb-out regulate power airspeed fly slow path around field Use distances Dist WDist D 13/16 13/16 3 1/2 1 3/16 1 1/2 3 7/8 4 1/4 4 1/4 411/16 115/16 2 3/4 4 1/4 4 2 1/32 421/32 4 2 1/32 4 21/32 413/16 5 1/16 5 7/16 characters apostrophe Colon E F J L Space Period comma Dash B D N 0 P Q R U 2356789 T V X Y 4 C G H K S Z $ M W Note All dimensions inches characters except small punctuation marks 6 1/4 high characters have 1 3/16 stroke December 1977 47 8 Rig aerial pickup consists two 8-ft bamboo poles set about eight feet apart Drophook released circling field plane flown about 4 feet above pickup loop top poles Tie scraps bright colored cloth loop drophook visibility TABLE 2 CHARACTER DIMENSIONS nere planeout picture rlgntnas snaggea pickup ioop ax moaerame speea gone high-power climbout sign has begun peel off ground author right concentrates control 4-lb line will break hook something mistake 50 100 feet Fly just fast enough keep sign tugged out straight main tain safe controllable airspeed plane Flying too fast easy will appear unrealistic cause undue sign flutter Since letter flutters like miniature flag continuous high airspeed can eventually damage sign As might expect towing load like plane will fly slower given power setting therefore respond slowly control movements ever because towline attached center gravity plane should have positive control response no unusual flight characteristics speak towing load Im referring drag cre ated sign its weight com plete 30-letter sign including bridle drag weighs about 4 ounces weight little significance Dropping sign simple just actuate towhook release sign will drop gently ground no damage Now have doubts about self plane trying heres safe easy way first few flights tow word get feel system method try two words three etc making several flights stage until towing full sign prepared abort tow time plane sign doesnt have way want Just drop sign think over later time crease load climb up safe altitude check planes performance control response progressing slowly like youll accomplish two things 1 youll develop full confidence yourself plane 2 youll find out long sign plane can safely tow second method lift-off extra equipment required optional requires precise flying dont hesitate try itits fun method youll fly plane over sign pick up trailing drophook Youll need 13 assemble letter parts laid Out shown assembly board layout Use aliphatic glue like Titebond Household Cement Ambroid etc. will curl up fabric make too rigid See text 48 Model Aviation 10 Sign towing has its special language Shown terms will using materials need listed Table 1 11 plentiful supply pre-cut bamboo oriental wall hangings found import shops department stores Other items found fishing tackle counter fabric store hobby shop 12 Preparing materials make character Also see Fig 11 Shown bamboo strips connector pole stiffeners two connector linesbutton carpet thread pieces about 10 long same towhook before youll also need drophook towline release mechanism shown photos 5 6 7 towline run 10-ft length monofila ment through center rectangular balsa spool Tie towring top end drophook bottom end Make drophook soft iron wire has no sharp projections just enough solder give little weight store line flight keep tangling wrap snugly around spool place spool hook hook-housing Put towring towhook set servos secure towhook drophook place prior flight braided throttle cable shown works fine drophook release As before Ill leave design servo action needed release drophook Photo 8 shows rig sign pickup Set up two 8-ft bamboo poles about 8 feet apart Beforehand make small vee-notch tip pole Lay sign out along flight path did first method towing bridle centered between poles make 24-ft monofilament line pickup loop Connect both ends line bridle lay loop formed across top two notched poles Last tie piece bright-colored yarn center loop another piece end drophook make visible Take off release drophook circling field As falls towline will unwind balsa spool until fully extended Since airstream will make trail back angle hook will about 8 feet below plane Guide plane moderate speed fly about 4 feet above center poles Just plane reaches poles apply full throttle establish normal climb did everything right drophook will catch pickup loop sign will gently peel off ground photo 9 didnt can always circle around try again dimensions given total towline will 22 feet long drophook line 10 feet pickup loop stretches out 12 feet length gives realistic appearance longer towline may need takeoff method Now understand sign picked up consider two precautions Use 4-lb test monofilamentif hook something mistake youll glad breaks Dont plant poles too firmly ground Can guess Now can tow sign dont recom mend novice dont think have expert pattern-pilot either best advice can fly plane vice versa can make plane go want what want can tow sign Sign Construction First check terms well using shown photo 10 materials youll need listed Ta ble 1 quantities arent specified since will depend letters tend make fabric store fishing tackle counter favorite hobby shop will supply needs except photo 11 reveals can find plentiful supply pre-cut bam boo oriental wall-hangings can find import shops department stores quality size strips vary somewhat after cull out December1977 49 14 Four steps forming connector end connector pole R Retainer sequins forced over bamboo connector pole shish kebab style Drill hole piece hardwood handy tool 15 character has connector pole front connector loops back Strip bamboo stiffens edge leading edge characterexcept commas etcrequire balance weight bottom 16 same principles applied characters whether letters numerals punctuation marks spaces between char acters nothing two connector lines connector pole 17 towing bridle must rugged because takes full brunt towing load Note strip solder wrapped around bottom bridle connector pole front sign trails vertically rest follows bad ones youll have toughest materials going Use strips about 3/64 1/16-in square slight variations wont hurt Now about shape letters Space wont permit drawing out whole alphabet plenty reference books However recommend using Gothic style letters shown Theyre boxy enough simple make yet have some eye-appeal easy read Also Id like recommend some basic proportions sizes letters will provide weight drag similar have tested Table 2 can see characters except small punctuation marks 6-in high have 1-3/16-in stroke will probably know letters same width spacing between different combinations letters varies give pleasing appearance Table 2 distances W D provided pur pose Once youve designed letters around basic proportions draw out 5 X 8 card can used template punch tiny holes card lines forming letters intersect Lay template fabric line edge card up fabric grain push felt-tipped pen through hole provide points outlining letter As cut letter out handle raw edges care prevent raveling Youll read later prevent finished letter Next youll need prepare simple assembly-board hold pieces let ter place glue together Fig 1 shows lay out piece ply wood Any letters numbers punc tuation marks can assembled scheme difference being locate connector loops establish distance D character making Photo 12 shows next step preparing materials make letter Cut out letter want start select bamboo strips connector pole stiffeners Next prepare two connector lines cut piece button capret thread about 10 long Form connector loop tying snugly around scrap Nyrod tubing slightly smaller diameter se quins used form connector see photo 14 A-in diameter sequins 3/16-in diameter Nyrod works out just right Apply drop glue knot before trimming off excess thread Make sure glue doesnt penetrate loop itself because loop should remain soft limber photos 12 14 can see loops connectors form simple connections between letters con necting letters together 1oop will stretch out oval shape slide over con nector easily sign towed 1oop stretches out tightly remains secure its connector Disassembling letters equally simple suggest make up sample two 1oop connector make sure assemble easily yet secure subjected pull assemble letter lay parts out shown photo 13 Insert pins brads assembly-board establish distance D Table 2 would 4-21/32 number 8 shown being assem bled sure connector lines under slight equal tension apply slender bead blue along joints tween bamboo thread fabric Make sure glue joints complete keep narrow possible letter will remain flexible Use aliphatic glue like Titebond household Ambroid glue will curl up fabric also make too rigid Youll find helpful hold bamboo strips down heavy fishing weights glue dries Next use small paint brush coat Continued page 91 50 Model Aviation 18 An expanding file provides handy storage keeps letters unwrinkled Authors kit contain 106 characters including five commonly used letters assembles sign field 15 minutes must have lost frequency pin club project qualify several pilots airplanes WHEELS RO WHEELS Smooth inflatable wheels big airplanes Features two piece bolt gether hubs hub caps Wheels can inflated deflated thru tiny valve side tire pressure de sire Truly remark able realistic looking wheel I$795 Pair 450R4-1 /2 Diameter995 Pair SOOR 5 Diameter11 95 Pair 550R5-1 /2 Diameter1 395 Pair 600R ameter1 595 Pair Low bounce shock absorbing wheels featuring 6 spoke dura hub finest quality hand inspected 175Tor RWheels 1-3/4$219 Pair 200 T RWheels 2239 Pair 225 T R SWheels 2-1/4259 Pair 250 T R SWheels 2-1/2279 Pair 275 T R 5Wheels 2-3/4299 Pair 300 T R 5Wheels 3319 Pair 325 T RWheels 3-1 /4339 Pair 350 T RWheels 3-1/2359 Pair DUBRO PRODUCTS INCORPORATED 480 BONNER ROAD WAUCONDA ILL 60084 total duration 75623 Fortunately FAI Sporting Code states explicitly required seaplanes land water So new record record-setting plane tree top Glenn Scillian went get help friends area spied ropes holding up canopy ropes hatchet John Tallmans car plunged through poison ivy base plane-eating tree climbed tree attacked offending branches After long exhausting work Shark fell stages ground delighted find damage minimal Lots fuel left later measure ment showed 35 fi oz 42% origi nal fuel remained tanks enough additional 5 hours same rate fuel usage longer leaner mixture ligher model ever records made actual rather potential performance Surpassing German record 25% quite satis fying result Special thanks order official witnesses some took day va cation leave help Friday lake busy Particular recognition due invisible Kenny Greenhouse Long ago Kenny assigned role documenting record attempts camera have never picture record articles Thanks also Dean Smith Lee Shiflett supplied critical parts flight Record setting exciting re warding activity doesnt require weekly travel follow contest circuit yet can compete entire world Opti mizing element modelair frame engine fuel system other componentsis necessary succeed Originality needed since wont find standardized approaches seen nor mal competition Free flight neglected area USA has 27 outdoor free flight records nearly held eastern European countries Control line radio control also have room improved performances Lets get going Tow Signs/Layers continued page 50 remaining raw fabric edges aliphatic glue has thinned 50-50 water Coat just /8-in margin fab ric will effectively stop edges raveling yet leave letter flexi ble After glue dry remove letter board trim off excess thread rough fabric edges part stiffener extends beyond edge letter Leave connector pole extra long now Photo 14 shows steps forming connector end connector pole Notice letters square front corners must have fabric cut out slight ly area Slip two sequins place leaving 1/16 3/32 between Although hole sequins small can forced over bamboo easily shish kebab style scrap ply wood hole makes fine tool push trim off bamboo leaving about 1/32 projecting form good glue joint Now glue sequins place epoxy sure form complete fillet epoxy between bamboo sequin surfaces As form inboard fillet let epoxy cover joint between connector line thread connector pole reinforcement junction pole sequins thread must good strong since entire towing load concentrated point last step letter finished Slide split-shot weight place photo 14 squeeze tightly fastened over both connector line thread fabric Youll have trim fabric edge back little get weight right position shapes other characters vary illustrated construc tion principles same charac ter has connector pole front connector loops back strip bamboo stiffens edge lead ing edge character needs balance December1977 91 WHOLE NEW LINE OF SMOOTH INFLATABLE BIG WHEELS 4 4Y 5 51h& 6 TREAD T SMOOTH R SLICKS 5 2 KITS e PLANS ACCESSORIES 1417 ME 17W SPAN STOCK NO PP 15 KIT $425 4 WALNUT SCALE KITS RART ACE$425 PEANUT SCALE KITS J3 CUE$329 PIREENPOL$329 MILES$329 TURRULENT$329 MUSTANG$349 ZERO$349 COUGAR$349 AIIIDREASOId$349 GIPSY MOTH$349 GANAGORIE$349 SPORT MODEL KITS ONE NITE 28$475 ONE NITE 16$349 STRINGLESS WONDER$249 PEcK ROD$139 KITS 0 PLANS S ACCESSORIES REAL JAPANESE TISSUEPROPS COMPLETE CATALOG 50 MANY HARD TO FIND ITEMS pP 0 BOX 2498 -AMALA MESA CAUF 92041 WPHONE 7141 4694675 17141 4424636 weight except very light ones such letter comma space Look over various photos especially photos 15 16 youll see principles applied entire alpha bet numbers punctuation marks Youll see too space nothing two connector lines connector pole Making letter takes little time reading about making lots sounds tedious lay out Fig 1 pattern ten places sheet plywood can assembly-line project making several time simplicity drag shown photo 17 assembly methods same four fingers formed cut ting slits drag better job re ducing flutter solid piece fabric Incidentally Ive tried variety drag de signs including U-shaped type used real signs Although shown doesnt provide scale appearance does best job sure coat raw fabric edges thinned-out glue dont put bal ance weight drag towing bridle also shown photo 17 must rugged because takes full brunt towing load Use monofila ment bridle rather thread use heavier bamboo dowel about 3/32 diameter pole Tie monofil ament swivel-snap 2 di mension wont change tie end pole After can form connector loops about 1 hind pole Epoxy monofilament pole epoxy knots too Wrap 4 inches A-in solder around bottom pole balance weight get front sign trail verti cally rest sign inclined same Now letters numbers punctuation marks will need Heres easy way find own answer Plan first sign message youll want tow regularly Mine read JOIN THE PALM BEACH SKYHAWKS TODAY provides beginning letter inventory lets start fly ing soon possible invent new messages tow build addi tional characters need way can build inventory over long period time yet enjoy towing signs youre doing field kit photo 18 contains 106 characters has five commonly used letters fewer others expanding file shown provides handy storage keeps letters un wrinkled Come think have 107 last Santa-in-a-sleigh towed front Merry Christmas sign suggest keep written inventory characters have time plan message can check quickly see have enough As Ns Ts etc make plan sign find lack certain letters complete stop think slight rewording might put idea across letters have STATEMENT OF OWNERS*41P MANAGEMENT AND CIRCULATION Rrqojred 39 USC 3683 1 TeIeoIPc6lisssion MODELAVIATION A PaIIuetofl No. 067930 2 Date ol Filing Sepseonben 13 1577 3 Frequency 01 sue Monthly A No01 Sues Publtehed Annually 12 8 Annual Sattcnipnon Prico Sn20G 4 Location 01 known OlIton 01 putaication street city county stale ZIP code pnnnnrsl 815 FIteenttn Sn NW Weahiognon DC 2008h 5 Location headquarters aecerel business offices publishers Non printers 815 Fitneensh St. NW Weshinston DC 211015 6 Names connplens addrinses Publisher Editor Monesins Editor PutnlelnOr Gel S Whenlen 015 Fjtteanth Sn. NW Washinason DC 20605 Editor Wlliaen 3 Winner 8th Ftneennh Sn. NW Wsshington DC 20006 Managing Edsor NONE 7Owner Acscssecyol Model Aeronautios81h Fmfttenth Sn. NW Washington DC 206155 8Know bondltolders wor69gees Other tacOriny holders owning hold jog n% went total amount 01 bonds orornns Othpr securities NONE S For coenpienmon nonptotit organicotions authorized snail spocial rates Igoonror 132n22 PSMI Tbn purpose lunction end nonprolit status nhs orOenjeeton tuempn status Icr Foderal incowe too ponprees ham non changed during preceding 12 moonhe Ecoent cod Nalorr Cnculation nIl Actual Acerageno copies no copies01 tiOgir eachissueissue duriogoublished prenadingnearest l2nlectheillingdane ATotal No COpes Printed Net Press Ron3703530106 BPard Ciroulation 1 Sales lhruuoh Dealers end Carriers SIrens Veodurs end Counter Sales23742306 2Mail Subtonrytross2911732d1S CTotal Paid Circulanmoo31 49135211 0Frco Djsgnibullun Mel Carrier Other Meaos Samylns Complmennary Other Finn Copres360621 30 ETotal Distribution Suns C cod Dl3517737341 FCopies No Dtnributerl 1Oltise Usc LOttOmr Unacoocoted Seciled eltor Printing10691750 2Returns row New Agente UTotal Sum E Fl end 2should equal press run show Al3703h39106 11 I certify stagrorennO made abum ore correct complete CARL S WFIEE LET Publisher Big Day Arrives Okay now youre ready try signs first time some final thoughts remind ers get field youll find takes 15 minutes assemble full sign decide make up night before flying youll pleased learn complete sign folds neatly shoe box room left lunch sure keep signs dry make sure grass isnt damp lay out fabric would soak up moisture like blotter youd never get off ground Using item start lets make up checklist precautions first few flights 1 Keep signs dry 2 Before takeoff check sign sure connectors secure wind flips sign about check again 3 Do test flying easy stages first word two 4 Keep spectators off side make pass drophook trail ing 5 Make sign lift-offs wind make normal climb-outs 6 During lift-off keep eyes tention plane Dont worry about signit will follow along has no other choice 7 Be prepared drop sign en gine falters especially during lift-off climb-out 8 Maintain performance safety factor never towing sign long cant climb plane altitude 9 Abide field safety rules usual Youll tempted tow sign right over crowd dont End Well thats build em thats tow em hope readers will try because its chal lenging yet useful project Also might want look prospects making club project parcel out work making kit letters qualif several planes pilots towing So last 33 letters Ill close saying TRY TOWING YOUR OWN SIGNSITSALOTTA FUN Lets see now takes 5 Ts 2 Rs 2 Ys 4 0s tographs article made Lee Boozer Jimmy Zeak Chuck Stevens Emilic Fuente Bill Layers members Palm Beach Sky hawks Engine Technique/Jehlik continued page 51 surplus metal ammo box about 14 X 18 X 20 can store running equipment box Tank I prefer round RC klunk tank mounted auto hose clamp screwed top box Tank filler Anything squeeze bulb 92 Model Aviation FLY wITM R95511 eWUR 69tet 0 WALNUT SCALE ASK POE OUR KITS AND ACCESSORIES Al YOUR LOCAL DEALER IF NOT AVAILARLE AT YOUR DEALER ORDER DIRECT ADD 60 POSTAGE BROWN CO-2 ENGINES ENGINES ARE IN STOCK NEW CHARGER AND S SIZES OF TANKS RROWN ENGINES MUST RE ORDERED DIRECT FROM PECK-POLYMERS