Making own Parts fiberglass plugs Fiberglass molds d can save some bucks giving a great sense satisfaction job well done its something youve always wanted door youre just curious about its doneread EMH Pickard FOR THE MODELER wants rise challenge just save few bucks story mold fiberglass part Though takes lot work some careful planning right its definitely economical goes well youll save little under two-thirds cost having average part professionally made procedure outlined making mold can used produce part Though production mold will give three four parts youre careful Begin accurate drawing drawing must represent exactly what needed unless carving mod el Two-piece parts such cheek cowls wheel pants must planned ginning Also configuration de sired part such one-piece mold wont work two-piece plug will neces sary can made up two pieces A-in plywood cut shape cen terline part fitted waxed dowels alignment separation plug material can glued ply bases carved shape Plug materials may hardwood balsa foam anything else can take hard finish Finishing surface plug critical slightest imperfection will reflected moldand finished part Take time carefully choosing plug material keep following considerations mind Hard wood easiest finish takes time patience carve Balsa other hand easier carve difficult finish since finish has wood rather its surface later Finally foam available two ba sic types Polyester foam found blue white green white coffee cups packing etc very soft touch very difficult sand blue dock flota tion etc too porous purposes preferred polyester green type used florists hold flowers etc quite dense soft easy shape sand Polyurethane foam available white brown used insulation buildings flotation boats etc comes various weights 2 24 lb per cu ft lower number softer foam Six pounds seems ideal density mak ing plug since its easy sand shape finish Finishing materials pine poplar plug may finished hard material Dope lacquer epoxy polyester work quite well Balsa may finished same ma terials first coat must thinned 50% allowed soak wood Af ter first application has hardened plug has sanded three unthinned coats should applied Polyurethane foam plugs may finished epoxy polyester Use epoxy however polyester foam anything else will melt down Dope lacquer can thinned lac quer thinner acetone Epoxies come two formsthick gluing parts thin layup work Both types can thinned alcohol Work small batches Afterthe catalyst thoroughly mixed sealable jar alco hol wood methanol can added little time until epoxy will flow soak easily Thinned epoxy takes longer cure alcohol requires time evapo rate mixed too much seal con tainer store surplus freezer Itll keep about week Brushes can cleaned alcohol soap water 56 Model Aviation base block establishes outline cowl centerline maxwidth cross line have scribed block has bonded foam block un der two T-nuts have installed plug base first coat black res Three coats resin required sanded smooth before applying next finished foam block representing Tay lorcraft cowl Recessing cutouts about s stronger structure Two cowls set wheel pants being readied molding paste waxes Butchers Tree wax Johnsons wax used white Masonite working base boards Dont use wax plug Don t use five-minute epoxy kind work Polyester resin comes four types 1 Gel coat resin usually colors first coat applied layup work 2 Laminating resin general-purpose layup resin no wax stays tacky cured about week cannot sanded 3 Finishing resin general-purpose resin wax used finishing since easily sanded resin must sanded between coats 4 Tooling resin used making molds four resins can thinned styrene acetone after mixing cat alyst Brushes may cleaned acetone Dont try save polyester after mix ing wontkeep Finishing plug intend add panel lines plug before fin ish applied Press cut lines plug remain visible ap ply resin Bolt plug down piece 34-in ply something similar placing slick smooth piece Masonite Formica tween plug mounting board Coat piece paste wax prevent plug sticking youre using epoxy finish however wax wont work thin piece vinyl will serve same purpose Have tub black dye available good paint store handy mix res wood plug dye covers grain foam turns material black bet ter visibility begin sanding fin ish Unsanded areas will show up shiny Mix first batch resin add little black dye thin 50% Apply mix ture plug Allow first application soak thoroughly Set plug aside cure cleaning brushes next coat applied unthinned February 1990 57 Wheel pant molds PJ 295 left mold has removed plug right still place Normally its best make plug black resin contrasts molding material making easier spot imperfections thin spots during molding 1 nis tne right half split cowl mold laid up its Masonite base backing sheet attached using three coats resin Shown center half split plug ply backplate showing max-width cross line 10-32 T-nuts dowels used attaching aligning two halves plug U two plug halves put together split plug will make cowling big Lazy Ace temporary backing plate T-nut screwing onto plug back its possi ble clamp plug vise angle Lazy Ace cowl split plug being shaped scraped sanded finishing cowl now clamped upright ta ble finishing air inlets small vise used sharpening scraping blade youre using polyester finishing resin ap ply second coat within 30 minutes first-coat application first coat has gelled gone dull wait too long youll have sand between coats Ideally either polyester epoxy three coats should applied before sand ing becomes necessary Dont allow resin run drip merely creates sand off later After third coat resin has ap plied start sanding scraping Sandpa per removes conspicuous roughness scrapers fine work Glass shards make great scrapers course must handled caution piece stainless steel about 050-in thick 450 edge filed side another good possibility several pieces can shaped fit con tours required Keep tool edges sharp file grinder hones steel edges glass cutter handy renewing edges glass Dont worry accidentally sand through resin spots sanding complete fill bare spots resin thickened little sanding dust Once damaged area filled cured sand smooth apply another coat resin entire plug youve sanded en tire plug absolutely smooth break ing through finish youre ready ap ply final coat resin Thin finish coat cover sanding marks thoroughly cured lightly sand first 150-grit paper blunt roughness remove dust particles wet sand Begin 320-wet work up 500-wet glass-smooth finish satisfied allow dry thoroughly before painting Use gloss-white lacquer color contrasts color mold can see what youre doing during layup Paint black youre going sent molding make white molds Making mold basic materials clude can butchers wax container polyvinyl alchohol PVA good sup ply fiberglass cloth mat PVA li quefied vinyl impervious resins can brushed sprayed removed warm water Open can PVA check its color before buying should red green product brown reject indicates contamination Transfer PVA can sealable glass bot tle immediately after purchase since trace rust will contaminate point plug should painted polished sitting its bare board Ap ply least three coats wax wiping off excess paper towel letting coat dry about 15 minutes before buf fing sure wax extends bottom base board Allow final coat stand several hours overnight before buffing out plug will have electromagnetic charge attracts dust Gently wiping down plug rag lightly sprayed little Fantasy similar brand spray cleaner will remove dust neutralize charge careful overdo spray cleaner itll also remove wax Brush spray PVA coat thats necessary Dont polish wipe plug Also despite what may have read attempting apply wax over PVA doesnt work know firsthand expe rience gel coat can now applied youre using epoxy mix up enough cover plug Add black dye ep oxy too thin tends run some tal cum powder Coat entire plug white fully covered extending coat about around base Once has begun harden mix epoxy begin applying glass mat Mat comes two weights 34 oz 1 /2 oz 34 -oz density works best Cut strip about 8 wide Roll up tightly twisting vigorously hands soften unroll strip cut 4-in-wide pieces Starting corners tear 4-in pieces half Dou ble overlap pieces lay up Lightweight fiberglass cloth will work just well glass cloth sold weight per square yard varies thickness material Lightweight cloth 2 4 oz Dont use fiberglass cur tains theyre treated purposes Start 1-in strip around base about out plug area must thick enough keep mold warping once its free Apply overlapping layers cloth top extending down over base Build up least two layers lay up another 1-in strip around base Set aside cure 24 hours Sand overlaps apply another coat res set aside three five days age 58 Model Aviation Some tools making plug far left hacksaw blade set wood block used making panel lines various files scrapers sanding blocks foam file Top Flite P-Si piug being readiedThe same P51 plug after both sides have painting black lacquer dry ItHere P-Si plug fence around itbeen laid up After its cured its split apart will polished waxed preparation forfor creating two-piece mold Its ready athe edges trimmed its ready beginning process laying up moldcoat PVA begin laying up moldprepare molding process begin around 700 Epoxy takes seven days 770 properly age thus minimizing risk mold warpage After aging period remove plug its base trim edge band saw sander leaving edge approxi mately /2 mold Especially one-piece mold air compressor almost necessity remov ing plug mold device will also help remove parts mold after youve made dont have com pressor rent buy borrow re move two-piece mold spread outer edges slightly work small knife enough create air passage blow some air plug should pop right out same other half youre ready wash PVA out warm water one-piece mold little diffi cult air compressor really comes its own After trimming edge mold begin lightly tapping entire mold rubber hammer sep arates mold plug just enough al low air introduced Drill hole top air inlet use compressor remove plug hole will used again later remove part mold directing air pressure through hole fails remove plug theres alterna tive method should work Blow air around bottom edge base stall long screw base grip screw vice gently work mold loose upward pressure edge Once free wash out PVA warm water polyester mold made basically same manner epoxy finish ing resin however contains wax Remove wax gently wiping down hard ened surface rag lightly soaked ac etone Let gel coat set about 30 minutes Check make sure doesnt come off touch apply cloth resin two layers its hard enough sand blend oYerlaps smooth final coat consists resin Allow set 24 hours long enough age polyester Separate plug mold using same methods outlined above Wash out PVA mold now com pleted yciure ready make some parts Laying up part Look mold over carefully inside edge little ragged smooth out wet sanding polish auto rubbing compound Give entire mold light polishing wax thoroughly least three times butchers wax just did plug Let set couple hours polish final time apply coat PVA Cover drilled air hole small piece tape make sure stays clear technique laying up part es sentially same whether using epoxy polyester curing times differ Mix up batch resin wet down inside Continued page 161 Bulkhead Fittings Fourmost Bulkhead Fitting s simple method feed fuel vent lines through solid bulkheads 1 Drill hole No 18 drill size bulkhead firewall up 3/8 thick 2 Insert shaft Bulkhead Fitting through hole 3 Screw nut onto backside fitting 4 Slip fuel vent tubes lob done Bulkhead Fittings provide sealed tank compartment eliminate fuel line chafing Color coded easy identification Weight 1/2 gram Price 2 $295 No 121 FOURMOST PRODUCTS Size 3/32 lD 4040 24th Avenue Forest Grove OR 97116 503 357-2732 February 1990 59 KJ Put Fun Back Fun Fly Get ROUN TUIT Today Its round S flat flies 30 Flying DISC STOL SUPERIOR Small Field S FUN FLY Aircraft STABLE PREDICTABLE S AGILE VISA Foam ft Lite Ply conairuction ELEVON Mixer Included 25-45 cid d 3-35Ibe Accurate QUALITY Matenala Mild Conat Time HOVERABLE Durable UNUSUAL Will NOT Spin itonded Model Products Box 10996 Suite 543 Austin TX 78766 512 250-1420 5124443368 ONLY Money Back GUARANTEE Business SIMPLY THE BEST may cost little fact is.. cant buy effective easier use soft mount PERIOD UNIVERSAL 2-cycle engines 20 61 EVERYTHING INCLUDED p Available Hobby Dealer order direct add $175 fer abplng MADE IN us manufacturer DISC-LOCK & HUSH FOAM dealer -distrbiIoeshs invited PERFORMANCE PRODUCTS UNLIMITED 7 7093 E Dodge Rd Mt Morris MI 48458 Phone orders 313 631-4894 Visa/MG accep VIBRA-DA BEAMS MP 21 50 VIBRA-DAMP $1095 ALUM TABS GATOR RIC PRODUCTS TIGER TAIL 4S DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offl oalsa kit machined wood parts complete hardwaie package includes plug-in djustable stab parts new wing mounts Wing Span -72 inWing ArHa 860 sq Complete Delux KitSi 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp S 1995 MV-I TYPHOON New F3A competition Big beautiful flyer -balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheetsS 1495 Fiberglass cowlSI B95 Clear butyrate canopy. S 995 OTHER PLANS Tiger Tail 4S-two sheets t 20 four strokes51495 TAB baby 120 four strokesS 1195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sportS 895 Bobcat 40 size sportS 895 GATOR SOFT MOUNTS COMPLErE SOFT MOUNTS INCLUDES ALL HARD WAREI Optimized lowest vibration transmission airframe minimizing engine shake Available YS-60 OS-60$1495 SOFT MOUNT COMPONENTS 4-lug Mounting Plate 606t-T-6 black anodized Undrilled. 559S Drilled VS-itO 05-60. S 695 Rubber Iso-Mounts 518 diameter x t long 8-32 female end 8-32 x 112 male other end Specify soft ISO durometer-yellowl firm 60 durometer-purple Each. S3OOPkg 4S995 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling est Finished Weight Big 3 Sq Yard Pkg Detailed Instructions 5895 Include $2 5Olltem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 325t4 1 476-8639 Best Show Mark Lattimore goal try pass Racing hints much help can need help have some neat trick really works about sharing Send hints and/or ideas will print Ill give credit about Please support NMPRA group re sponsible getting us today information write Ron Schorr 5224 Teesdale N Hollywood CA 91607 See next month RC Helicopters/Jolly Continued train page 55 against clock making naturally fun con test sharpens skills also ring-pickup contest use Helicopters landing skid lift ring rings get smaller effort gets greater also limbo event try place machine under crepe paper limbo bar event sometimes accompanied teresting sounds rotors greet limbo pole No major damage inflictedits part fun also Helicopters work pilot must lift weighted sling load fly cir cuit drop load off another station last two events perennial favorites first being Fun Scale Honestly its fact Scale competition Merced far tougher AMA Nationals fact wouldnt bad idea get fund set up send guy wins Scale Merced following Nats year Pat Brady won Scale Chan nel 3 News Jet Ranger Pat also won last year kind expected him show up Nats Oh well t time Second place Nats Champion Silas Kuok gorgeous scratch-built SA 341 Gazelle third place Walt Ferars super GMP Santini Air Jet Ranger Helicopters class looked super also flew well last event held autorosasions spot held late Sunday afternoon fa vorite spectator event class favorite Robert Gorham can put Helicopter middle spot nine times out 10with 10th being just slightly off center year however Robert challenged Dan Melnik Kalt group Dan actually tied Robert first place since fac tory pilots relinquished prizes thirdplace finisher Walt Ferar GMP Legend Also seen ausorosation Mike Mas proceeded fly Champion tail-first spot auto Oh wonders driven taileh Mike So what new year far products concerned Helicopters Unlimited Century Imports rep resentative Peter Chow first person stopped see Peter has super Larry Jolly Model Products Airwolf display well own little EH-100 electric-powered Helicopter should see little Electric right after first year Ill report further soon available Hobby Dynamics JR Radios representatives Dan Melnik Frank Dykes showed Kalt line Helicopters JR radios Dan gave some spectacular demos Kalts new Excalibur aer obasic machine proving its 91 gear ra tio its bit equal other 60-size rocket ships Gorham Model Products Rebels flying con tinuously including built local hobby shop owner flew free flight over four min utes result either dead batteries switch failure machine hovered around ran out fuel landedan incredible featshowing just stable Rebel Also display GMPs new FAI mechanics done yet getting closer nailing down design Robert Gorham gave spectacular dem os both Saturday Sunday showing us way wish could fly Incredible Rob ert incredible Robbe s representative Mike Mas gave some great demos Champion showing us just good design really thats ahout rest us just great time flying talking Helicopters though lot folks taking Mer ced days theres still room So get out 1990 calendar mark off last weekend September Well see BCNU Make Mold/Pickard Continued page 59 mold lay small pieces cloth us ing crisscross pattern side side top bottom Leave about ing out Wet down entire cloth layer until see black Lay second layer R/C SEMI-KIT stock ORIe iqiines invited SHORT KITS INCLUDE STYF OPOADi WINO CORES CANOPIES COWL5 PLA55 ENOINE MOUNTS FIREWALLS MOLSED i55C PAR5S 5OME HARDWARE AND MATERIALS LIST FOR RALIA Ass ADDITIONAL OFF STE 5RELP ITEMS AGM2 ZERO 54 5PAN3750 PRO SOMAEAWE 55SPAS2750 P 55 AIRACOBRA 55SPAN35 55 9515 MASSANO SR5PAN3750 252 POLOORE 555PAN3750 POCRE WALE 1W SR SPAN 37 55 A26 iNVAOER 65 SPAN 95 P38LIOHONiNG 70 SPAN 7495 PRO CORSAIR 56 SPAN 5 ORDERING SEND CHECK OR MONKS ORDER FOR REQUiRED ARRO5NS PLAS 5450 PER KIT CANADIANS ADD S750I ILLINOiS RESIDENTS ASS AR% SAD WING Mfg 306 E Simmons Galesburg IL 61401 DR 59 0D0tt 94 H6 0 WHEN YOU FORGET\OUR UNITS REMEMBER RC System NICd Batteries Alt chargers need- tn packaget 6V Tx packsPlus $5 S&HGelled Cell Others available write call TrickIer $3496 ForPlus $3 SB-HRegular Model 6 Multiple~eC4For held kit small Plus $3 SB-H Radioselectric boat battenes Specify 612 24V CDHeavy Duty Model $5896 sport winch large boat andPlus $4 SB-H electric power charging batteriesSpecify 6 1 2V CaRa Products SASE br iticimabcePO BOx 221 Oerirtqurnmmnsiied Canton SD 57013 February 1990 161 overlapping cloth pieces until youve covered entire mold twice Make sure resin doesnt pooi bottom Lay mold its side keep turning over couple minutes un til begins kick off Leave epoxy part mold least three days poly ester part should left overnight part light heavy fiber glass its made youre removing very lightweight part mold careful compressor could turn part inside out Youre better off leaving -in cloth overlap around edge extra bulk Heavier parts can blown out relative ease After removing part wash mold water dry thor oughly rewax apply another coat PVA Youre ready mold another part Advice If problems develop have difficulty working out Ill gladly try help please dont telephone Send SASE along description prob lem MH Pickard Fiberglass Master Inc Rt 1 Box 530 Goodview VA 24095 Fiberglass Corporation good source supplies youll need preparing plugs casting molds parts Contact company 1944 Neva Dr Dayton OH 45414 telephone 1-800/821-3283 1513/274-1 159 Ohio good source polyurethane foam contact St Rux Corp 100 E Montauk Hwy Lindenhurst NY 11757 telephone 1-516/9578000 FF Duration/Murphy Continued page 61 However Elfins popularity has recently sky rocketed SAM Society Antique Model ers Class events became apparent probably powerful trouble-free its ignition contemporaries such old Class standbys Arden 199 Ohlsson 19 Bantam 19 etc Having declared legal SAM competi tions British-made Elfin 249 repro-engines have certainly made imprint instance however supplies currently exhausted Argo-USA has recently issued notice due hundreds requests diesel now manufactured right US well-known reliable manufacturer Ap parently laws supply demand still valid certainly good news Should re quire additional information price availability new repro venture just write Argo-USA. 3229 Dianora Dr Palos Verdes Peninsula CA 90274 Tell em Duration told about engine info comes us Phil McCary/Larry Jenno venture modifies minute Cox 020 Pee Wee engine accept ven turi system reminiscent old TD Thermal Hopper modification also includes custommade three-prong radial engine mount Natural ly intent hop-up effort use Pee Wee 30 event first question comes mind results Well mounted business end model designed Charlie Atkinson called Hi-Roller obviously stemming Las Vegas won Phil Larry first second places 1989 US Free Flight Champs last May also entrants max out Phil claims 18000-20000 rpm 40%-nitro fuel using standard 45 x 2 Cox gray plastic prop cut down 425 x 2 prop blades also thinned some balanced Phil Larry like start early thinwalled-cylinder 020s claiming have better piston/cylinder fits what currently being produced reed body machined off tank intake tube cut down collar made fit over intake tube threaded ac cept Cox TD 020 venturi needle valve sembly gas tank machined off meth ods mounting engine thereby elimi nated new three-pronged adapter mount machined hard aluminum fulfill re quirement Thats What see what get Technically appears start good engine put TD 020 needle valve sembly itbut sure looks nice too Hi-Roller sports 8% airfoil wing 6% stab Both wing stab undercambered Should wish additional infor mation engines model both send SASE Phil McCary Jr 532 College Dr 2l2 Henderson NV 89015 Personally think ventures such healthy model competition though takes place so-called beginners event Im too sure Pee Wee 30 constitutes beginners event anyway since seems competi tors area contest circles participate have flying Free Flight years Maybe should listed under heading fun event instead FF event fun particular event liking dividual However FFers like same events reason have eventsand put tachometer stock Cox Pee Wee 020 fall belonged Bill Hale Basic Yeller fame see Duration column August 1988 sounded great clocked 19000 rpm asked him hopped up said did take out bubble pack came run Granted differences tachometers atmospheric conditions point apparently stock en gines around can hold own hopped-up versions rate Pee Wee 30 event continues roll along competition will naturally get stifferand what can detrimental rest case Gary Buddenbohm sent sample kits Silly Putty DT Systems brother Stan pro duce kits result trying nearly 50 prototype systems before achieving current de sign As mute testimony questions regard ing merits final system Stan won Hand-Launched Glider event 89 AMA Nats using SDT system Gliders took kits CIA Central Indiana Aeromodel ers club meeting recently generated considerable interest Although Ive mentioned gadget col umn before Ill repeat tab $5 either HLG Small Rubber kit cludes appropriate instructions Want mailing address SDT Systems 5652 Mainhardt Rd Westminster CA 92683 Take fire haz ard out flying try Preventive maintenance department beauty neatly covered fuselage framework Continued page 166 162 Model Aviation Name Street Address City 7in
Edition: Model Aviation - 1990/02
Page Numbers: 56, 57, 58, 59, 161, 162
Making own Parts fiberglass plugs Fiberglass molds d can save some bucks giving a great sense satisfaction job well done its something youve always wanted door youre just curious about its doneread EMH Pickard FOR THE MODELER wants rise challenge just save few bucks story mold fiberglass part Though takes lot work some careful planning right its definitely economical goes well youll save little under two-thirds cost having average part professionally made procedure outlined making mold can used produce part Though production mold will give three four parts youre careful Begin accurate drawing drawing must represent exactly what needed unless carving mod el Two-piece parts such cheek cowls wheel pants must planned ginning Also configuration de sired part such one-piece mold wont work two-piece plug will neces sary can made up two pieces A-in plywood cut shape cen terline part fitted waxed dowels alignment separation plug material can glued ply bases carved shape Plug materials may hardwood balsa foam anything else can take hard finish Finishing surface plug critical slightest imperfection will reflected moldand finished part Take time carefully choosing plug material keep following considerations mind Hard wood easiest finish takes time patience carve Balsa other hand easier carve difficult finish since finish has wood rather its surface later Finally foam available two ba sic types Polyester foam found blue white green white coffee cups packing etc very soft touch very difficult sand blue dock flota tion etc too porous purposes preferred polyester green type used florists hold flowers etc quite dense soft easy shape sand Polyurethane foam available white brown used insulation buildings flotation boats etc comes various weights 2 24 lb per cu ft lower number softer foam Six pounds seems ideal density mak ing plug since its easy sand shape finish Finishing materials pine poplar plug may finished hard material Dope lacquer epoxy polyester work quite well Balsa may finished same ma terials first coat must thinned 50% allowed soak wood Af ter first application has hardened plug has sanded three unthinned coats should applied Polyurethane foam plugs may finished epoxy polyester Use epoxy however polyester foam anything else will melt down Dope lacquer can thinned lac quer thinner acetone Epoxies come two formsthick gluing parts thin layup work Both types can thinned alcohol Work small batches Afterthe catalyst thoroughly mixed sealable jar alco hol wood methanol can added little time until epoxy will flow soak easily Thinned epoxy takes longer cure alcohol requires time evapo rate mixed too much seal con tainer store surplus freezer Itll keep about week Brushes can cleaned alcohol soap water 56 Model Aviation base block establishes outline cowl centerline maxwidth cross line have scribed block has bonded foam block un der two T-nuts have installed plug base first coat black res Three coats resin required sanded smooth before applying next finished foam block representing Tay lorcraft cowl Recessing cutouts about s stronger structure Two cowls set wheel pants being readied molding paste waxes Butchers Tree wax Johnsons wax used white Masonite working base boards Dont use wax plug Don t use five-minute epoxy kind work Polyester resin comes four types 1 Gel coat resin usually colors first coat applied layup work 2 Laminating resin general-purpose layup resin no wax stays tacky cured about week cannot sanded 3 Finishing resin general-purpose resin wax used finishing since easily sanded resin must sanded between coats 4 Tooling resin used making molds four resins can thinned styrene acetone after mixing cat alyst Brushes may cleaned acetone Dont try save polyester after mix ing wontkeep Finishing plug intend add panel lines plug before fin ish applied Press cut lines plug remain visible ap ply resin Bolt plug down piece 34-in ply something similar placing slick smooth piece Masonite Formica tween plug mounting board Coat piece paste wax prevent plug sticking youre using epoxy finish however wax wont work thin piece vinyl will serve same purpose Have tub black dye available good paint store handy mix res wood plug dye covers grain foam turns material black bet ter visibility begin sanding fin ish Unsanded areas will show up shiny Mix first batch resin add little black dye thin 50% Apply mix ture plug Allow first application soak thoroughly Set plug aside cure cleaning brushes next coat applied unthinned February 1990 57 Wheel pant molds PJ 295 left mold has removed plug right still place Normally its best make plug black resin contrasts molding material making easier spot imperfections thin spots during molding 1 nis tne right half split cowl mold laid up its Masonite base backing sheet attached using three coats resin Shown center half split plug ply backplate showing max-width cross line 10-32 T-nuts dowels used attaching aligning two halves plug U two plug halves put together split plug will make cowling big Lazy Ace temporary backing plate T-nut screwing onto plug back its possi ble clamp plug vise angle Lazy Ace cowl split plug being shaped scraped sanded finishing cowl now clamped upright ta ble finishing air inlets small vise used sharpening scraping blade youre using polyester finishing resin ap ply second coat within 30 minutes first-coat application first coat has gelled gone dull wait too long youll have sand between coats Ideally either polyester epoxy three coats should applied before sand ing becomes necessary Dont allow resin run drip merely creates sand off later After third coat resin has ap plied start sanding scraping Sandpa per removes conspicuous roughness scrapers fine work Glass shards make great scrapers course must handled caution piece stainless steel about 050-in thick 450 edge filed side another good possibility several pieces can shaped fit con tours required Keep tool edges sharp file grinder hones steel edges glass cutter handy renewing edges glass Dont worry accidentally sand through resin spots sanding complete fill bare spots resin thickened little sanding dust Once damaged area filled cured sand smooth apply another coat resin entire plug youve sanded en tire plug absolutely smooth break ing through finish youre ready ap ply final coat resin Thin finish coat cover sanding marks thoroughly cured lightly sand first 150-grit paper blunt roughness remove dust particles wet sand Begin 320-wet work up 500-wet glass-smooth finish satisfied allow dry thoroughly before painting Use gloss-white lacquer color contrasts color mold can see what youre doing during layup Paint black youre going sent molding make white molds Making mold basic materials clude can butchers wax container polyvinyl alchohol PVA good sup ply fiberglass cloth mat PVA li quefied vinyl impervious resins can brushed sprayed removed warm water Open can PVA check its color before buying should red green product brown reject indicates contamination Transfer PVA can sealable glass bot tle immediately after purchase since trace rust will contaminate point plug should painted polished sitting its bare board Ap ply least three coats wax wiping off excess paper towel letting coat dry about 15 minutes before buf fing sure wax extends bottom base board Allow final coat stand several hours overnight before buffing out plug will have electromagnetic charge attracts dust Gently wiping down plug rag lightly sprayed little Fantasy similar brand spray cleaner will remove dust neutralize charge careful overdo spray cleaner itll also remove wax Brush spray PVA coat thats necessary Dont polish wipe plug Also despite what may have read attempting apply wax over PVA doesnt work know firsthand expe rience gel coat can now applied youre using epoxy mix up enough cover plug Add black dye ep oxy too thin tends run some tal cum powder Coat entire plug white fully covered extending coat about around base Once has begun harden mix epoxy begin applying glass mat Mat comes two weights 34 oz 1 /2 oz 34 -oz density works best Cut strip about 8 wide Roll up tightly twisting vigorously hands soften unroll strip cut 4-in-wide pieces Starting corners tear 4-in pieces half Dou ble overlap pieces lay up Lightweight fiberglass cloth will work just well glass cloth sold weight per square yard varies thickness material Lightweight cloth 2 4 oz Dont use fiberglass cur tains theyre treated purposes Start 1-in strip around base about out plug area must thick enough keep mold warping once its free Apply overlapping layers cloth top extending down over base Build up least two layers lay up another 1-in strip around base Set aside cure 24 hours Sand overlaps apply another coat res set aside three five days age 58 Model Aviation Some tools making plug far left hacksaw blade set wood block used making panel lines various files scrapers sanding blocks foam file Top Flite P-Si piug being readiedThe same P51 plug after both sides have painting black lacquer dry ItHere P-Si plug fence around itbeen laid up After its cured its split apart will polished waxed preparation forfor creating two-piece mold Its ready athe edges trimmed its ready beginning process laying up moldcoat PVA begin laying up moldprepare molding process begin around 700 Epoxy takes seven days 770 properly age thus minimizing risk mold warpage After aging period remove plug its base trim edge band saw sander leaving edge approxi mately /2 mold Especially one-piece mold air compressor almost necessity remov ing plug mold device will also help remove parts mold after youve made dont have com pressor rent buy borrow re move two-piece mold spread outer edges slightly work small knife enough create air passage blow some air plug should pop right out same other half youre ready wash PVA out warm water one-piece mold little diffi cult air compressor really comes its own After trimming edge mold begin lightly tapping entire mold rubber hammer sep arates mold plug just enough al low air introduced Drill hole top air inlet use compressor remove plug hole will used again later remove part mold directing air pressure through hole fails remove plug theres alterna tive method should work Blow air around bottom edge base stall long screw base grip screw vice gently work mold loose upward pressure edge Once free wash out PVA warm water polyester mold made basically same manner epoxy finish ing resin however contains wax Remove wax gently wiping down hard ened surface rag lightly soaked ac etone Let gel coat set about 30 minutes Check make sure doesnt come off touch apply cloth resin two layers its hard enough sand blend oYerlaps smooth final coat consists resin Allow set 24 hours long enough age polyester Separate plug mold using same methods outlined above Wash out PVA mold now com pleted yciure ready make some parts Laying up part Look mold over carefully inside edge little ragged smooth out wet sanding polish auto rubbing compound Give entire mold light polishing wax thoroughly least three times butchers wax just did plug Let set couple hours polish final time apply coat PVA Cover drilled air hole small piece tape make sure stays clear technique laying up part es sentially same whether using epoxy polyester curing times differ Mix up batch resin wet down inside Continued page 161 Bulkhead Fittings Fourmost Bulkhead Fitting s simple method feed fuel vent lines through solid bulkheads 1 Drill hole No 18 drill size bulkhead firewall up 3/8 thick 2 Insert shaft Bulkhead Fitting through hole 3 Screw nut onto backside fitting 4 Slip fuel vent tubes lob done Bulkhead Fittings provide sealed tank compartment eliminate fuel line chafing Color coded easy identification Weight 1/2 gram Price 2 $295 No 121 FOURMOST PRODUCTS Size 3/32 lD 4040 24th Avenue Forest Grove OR 97116 503 357-2732 February 1990 59 KJ Put Fun Back Fun Fly Get ROUN TUIT Today Its round S flat flies 30 Flying DISC STOL SUPERIOR Small Field S FUN FLY Aircraft STABLE PREDICTABLE S AGILE VISA Foam ft Lite Ply conairuction ELEVON Mixer Included 25-45 cid d 3-35Ibe Accurate QUALITY Matenala Mild Conat Time HOVERABLE Durable UNUSUAL Will NOT Spin itonded Model Products Box 10996 Suite 543 Austin TX 78766 512 250-1420 5124443368 ONLY Money Back GUARANTEE Business SIMPLY THE BEST may cost little fact is.. cant buy effective easier use soft mount PERIOD UNIVERSAL 2-cycle engines 20 61 EVERYTHING INCLUDED p Available Hobby Dealer order direct add $175 fer abplng MADE IN us manufacturer DISC-LOCK & HUSH FOAM dealer -distrbiIoeshs invited PERFORMANCE PRODUCTS UNLIMITED 7 7093 E Dodge Rd Mt Morris MI 48458 Phone orders 313 631-4894 Visa/MG accep VIBRA-DA BEAMS MP 21 50 VIBRA-DAMP $1095 ALUM TABS GATOR RIC PRODUCTS TIGER TAIL 4S DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offl oalsa kit machined wood parts complete hardwaie package includes plug-in djustable stab parts new wing mounts Wing Span -72 inWing ArHa 860 sq Complete Delux KitSi 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp S 1995 MV-I TYPHOON New F3A competition Big beautiful flyer -balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheetsS 1495 Fiberglass cowlSI B95 Clear butyrate canopy. S 995 OTHER PLANS Tiger Tail 4S-two sheets t 20 four strokes51495 TAB baby 120 four strokesS 1195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sportS 895 Bobcat 40 size sportS 895 GATOR SOFT MOUNTS COMPLErE SOFT MOUNTS INCLUDES ALL HARD WAREI Optimized lowest vibration transmission airframe minimizing engine shake Available YS-60 OS-60$1495 SOFT MOUNT COMPONENTS 4-lug Mounting Plate 606t-T-6 black anodized Undrilled. 559S Drilled VS-itO 05-60. S 695 Rubber Iso-Mounts 518 diameter x t long 8-32 female end 8-32 x 112 male other end Specify soft ISO durometer-yellowl firm 60 durometer-purple Each. S3OOPkg 4S995 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling est Finished Weight Big 3 Sq Yard Pkg Detailed Instructions 5895 Include $2 5Olltem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 325t4 1 476-8639 Best Show Mark Lattimore goal try pass Racing hints much help can need help have some neat trick really works about sharing Send hints and/or ideas will print Ill give credit about Please support NMPRA group re sponsible getting us today information write Ron Schorr 5224 Teesdale N Hollywood CA 91607 See next month RC Helicopters/Jolly Continued train page 55 against clock making naturally fun con test sharpens skills also ring-pickup contest use Helicopters landing skid lift ring rings get smaller effort gets greater also limbo event try place machine under crepe paper limbo bar event sometimes accompanied teresting sounds rotors greet limbo pole No major damage inflictedits part fun also Helicopters work pilot must lift weighted sling load fly cir cuit drop load off another station last two events perennial favorites first being Fun Scale Honestly its fact Scale competition Merced far tougher AMA Nationals fact wouldnt bad idea get fund set up send guy wins Scale Merced following Nats year Pat Brady won Scale Chan nel 3 News Jet Ranger Pat also won last year kind expected him show up Nats Oh well t time Second place Nats Champion Silas Kuok gorgeous scratch-built SA 341 Gazelle third place Walt Ferars super GMP Santini Air Jet Ranger Helicopters class looked super also flew well last event held autorosasions spot held late Sunday afternoon fa vorite spectator event class favorite Robert Gorham can put Helicopter middle spot nine times out 10with 10th being just slightly off center year however Robert challenged Dan Melnik Kalt group Dan actually tied Robert first place since fac tory pilots relinquished prizes thirdplace finisher Walt Ferar GMP Legend Also seen ausorosation Mike Mas proceeded fly Champion tail-first spot auto Oh wonders driven taileh Mike So what new year far products concerned Helicopters Unlimited Century Imports rep resentative Peter Chow first person stopped see Peter has super Larry Jolly Model Products Airwolf display well own little EH-100 electric-powered Helicopter should see little Electric right after first year Ill report further soon available Hobby Dynamics JR Radios representatives Dan Melnik Frank Dykes showed Kalt line Helicopters JR radios Dan gave some spectacular demos Kalts new Excalibur aer obasic machine proving its 91 gear ra tio its bit equal other 60-size rocket ships Gorham Model Products Rebels flying con tinuously including built local hobby shop owner flew free flight over four min utes result either dead batteries switch failure machine hovered around ran out fuel landedan incredible featshowing just stable Rebel Also display GMPs new FAI mechanics done yet getting closer nailing down design Robert Gorham gave spectacular dem os both Saturday Sunday showing us way wish could fly Incredible Rob ert incredible Robbe s representative Mike Mas gave some great demos Champion showing us just good design really thats ahout rest us just great time flying talking Helicopters though lot folks taking Mer ced days theres still room So get out 1990 calendar mark off last weekend September Well see BCNU Make Mold/Pickard Continued page 59 mold lay small pieces cloth us ing crisscross pattern side side top bottom Leave about ing out Wet down entire cloth layer until see black Lay second layer R/C SEMI-KIT stock ORIe iqiines invited SHORT KITS INCLUDE STYF OPOADi WINO CORES CANOPIES COWL5 PLA55 ENOINE MOUNTS FIREWALLS MOLSED i55C PAR5S 5OME HARDWARE AND MATERIALS LIST FOR RALIA Ass ADDITIONAL OFF STE 5RELP ITEMS AGM2 ZERO 54 5PAN3750 PRO SOMAEAWE 55SPAS2750 P 55 AIRACOBRA 55SPAN35 55 9515 MASSANO SR5PAN3750 252 POLOORE 555PAN3750 POCRE WALE 1W SR SPAN 37 55 A26 iNVAOER 65 SPAN 95 P38LIOHONiNG 70 SPAN 7495 PRO CORSAIR 56 SPAN 5 ORDERING SEND CHECK OR MONKS ORDER FOR REQUiRED ARRO5NS PLAS 5450 PER KIT CANADIANS ADD S750I ILLINOiS RESIDENTS ASS AR% SAD WING Mfg 306 E Simmons Galesburg IL 61401 DR 59 0D0tt 94 H6 0 WHEN YOU FORGET\OUR UNITS REMEMBER RC System NICd Batteries Alt chargers need- tn packaget 6V Tx packsPlus $5 S&HGelled Cell Others available write call TrickIer $3496 ForPlus $3 SB-HRegular Model 6 Multiple~eC4For held kit small Plus $3 SB-H Radioselectric boat battenes Specify 612 24V CDHeavy Duty Model $5896 sport winch large boat andPlus $4 SB-H electric power charging batteriesSpecify 6 1 2V CaRa Products SASE br iticimabcePO BOx 221 Oerirtqurnmmnsiied Canton SD 57013 February 1990 161 overlapping cloth pieces until youve covered entire mold twice Make sure resin doesnt pooi bottom Lay mold its side keep turning over couple minutes un til begins kick off Leave epoxy part mold least three days poly ester part should left overnight part light heavy fiber glass its made youre removing very lightweight part mold careful compressor could turn part inside out Youre better off leaving -in cloth overlap around edge extra bulk Heavier parts can blown out relative ease After removing part wash mold water dry thor oughly rewax apply another coat PVA Youre ready mold another part Advice If problems develop have difficulty working out Ill gladly try help please dont telephone Send SASE along description prob lem MH Pickard Fiberglass Master Inc Rt 1 Box 530 Goodview VA 24095 Fiberglass Corporation good source supplies youll need preparing plugs casting molds parts Contact company 1944 Neva Dr Dayton OH 45414 telephone 1-800/821-3283 1513/274-1 159 Ohio good source polyurethane foam contact St Rux Corp 100 E Montauk Hwy Lindenhurst NY 11757 telephone 1-516/9578000 FF Duration/Murphy Continued page 61 However Elfins popularity has recently sky rocketed SAM Society Antique Model ers Class events became apparent probably powerful trouble-free its ignition contemporaries such old Class standbys Arden 199 Ohlsson 19 Bantam 19 etc Having declared legal SAM competi tions British-made Elfin 249 repro-engines have certainly made imprint instance however supplies currently exhausted Argo-USA has recently issued notice due hundreds requests diesel now manufactured right US well-known reliable manufacturer Ap parently laws supply demand still valid certainly good news Should re quire additional information price availability new repro venture just write Argo-USA. 3229 Dianora Dr Palos Verdes Peninsula CA 90274 Tell em Duration told about engine info comes us Phil McCary/Larry Jenno venture modifies minute Cox 020 Pee Wee engine accept ven turi system reminiscent old TD Thermal Hopper modification also includes custommade three-prong radial engine mount Natural ly intent hop-up effort use Pee Wee 30 event first question comes mind results Well mounted business end model designed Charlie Atkinson called Hi-Roller obviously stemming Las Vegas won Phil Larry first second places 1989 US Free Flight Champs last May also entrants max out Phil claims 18000-20000 rpm 40%-nitro fuel using standard 45 x 2 Cox gray plastic prop cut down 425 x 2 prop blades also thinned some balanced Phil Larry like start early thinwalled-cylinder 020s claiming have better piston/cylinder fits what currently being produced reed body machined off tank intake tube cut down collar made fit over intake tube threaded ac cept Cox TD 020 venturi needle valve sembly gas tank machined off meth ods mounting engine thereby elimi nated new three-pronged adapter mount machined hard aluminum fulfill re quirement Thats What see what get Technically appears start good engine put TD 020 needle valve sembly itbut sure looks nice too Hi-Roller sports 8% airfoil wing 6% stab Both wing stab undercambered Should wish additional infor mation engines model both send SASE Phil McCary Jr 532 College Dr 2l2 Henderson NV 89015 Personally think ventures such healthy model competition though takes place so-called beginners event Im too sure Pee Wee 30 constitutes beginners event anyway since seems competi tors area contest circles participate have flying Free Flight years Maybe should listed under heading fun event instead FF event fun particular event liking dividual However FFers like same events reason have eventsand put tachometer stock Cox Pee Wee 020 fall belonged Bill Hale Basic Yeller fame see Duration column August 1988 sounded great clocked 19000 rpm asked him hopped up said did take out bubble pack came run Granted differences tachometers atmospheric conditions point apparently stock en gines around can hold own hopped-up versions rate Pee Wee 30 event continues roll along competition will naturally get stifferand what can detrimental rest case Gary Buddenbohm sent sample kits Silly Putty DT Systems brother Stan pro duce kits result trying nearly 50 prototype systems before achieving current de sign As mute testimony questions regard ing merits final system Stan won Hand-Launched Glider event 89 AMA Nats using SDT system Gliders took kits CIA Central Indiana Aeromodel ers club meeting recently generated considerable interest Although Ive mentioned gadget col umn before Ill repeat tab $5 either HLG Small Rubber kit cludes appropriate instructions Want mailing address SDT Systems 5652 Mainhardt Rd Westminster CA 92683 Take fire haz ard out flying try Preventive maintenance department beauty neatly covered fuselage framework Continued page 166 162 Model Aviation Name Street Address City 7in
Edition: Model Aviation - 1990/02
Page Numbers: 56, 57, 58, 59, 161, 162
Making own Parts fiberglass plugs Fiberglass molds d can save some bucks giving a great sense satisfaction job well done its something youve always wanted door youre just curious about its doneread EMH Pickard FOR THE MODELER wants rise challenge just save few bucks story mold fiberglass part Though takes lot work some careful planning right its definitely economical goes well youll save little under two-thirds cost having average part professionally made procedure outlined making mold can used produce part Though production mold will give three four parts youre careful Begin accurate drawing drawing must represent exactly what needed unless carving mod el Two-piece parts such cheek cowls wheel pants must planned ginning Also configuration de sired part such one-piece mold wont work two-piece plug will neces sary can made up two pieces A-in plywood cut shape cen terline part fitted waxed dowels alignment separation plug material can glued ply bases carved shape Plug materials may hardwood balsa foam anything else can take hard finish Finishing surface plug critical slightest imperfection will reflected moldand finished part Take time carefully choosing plug material keep following considerations mind Hard wood easiest finish takes time patience carve Balsa other hand easier carve difficult finish since finish has wood rather its surface later Finally foam available two ba sic types Polyester foam found blue white green white coffee cups packing etc very soft touch very difficult sand blue dock flota tion etc too porous purposes preferred polyester green type used florists hold flowers etc quite dense soft easy shape sand Polyurethane foam available white brown used insulation buildings flotation boats etc comes various weights 2 24 lb per cu ft lower number softer foam Six pounds seems ideal density mak ing plug since its easy sand shape finish Finishing materials pine poplar plug may finished hard material Dope lacquer epoxy polyester work quite well Balsa may finished same ma terials first coat must thinned 50% allowed soak wood Af ter first application has hardened plug has sanded three unthinned coats should applied Polyurethane foam plugs may finished epoxy polyester Use epoxy however polyester foam anything else will melt down Dope lacquer can thinned lac quer thinner acetone Epoxies come two formsthick gluing parts thin layup work Both types can thinned alcohol Work small batches Afterthe catalyst thoroughly mixed sealable jar alco hol wood methanol can added little time until epoxy will flow soak easily Thinned epoxy takes longer cure alcohol requires time evapo rate mixed too much seal con tainer store surplus freezer Itll keep about week Brushes can cleaned alcohol soap water 56 Model Aviation base block establishes outline cowl centerline maxwidth cross line have scribed block has bonded foam block un der two T-nuts have installed plug base first coat black res Three coats resin required sanded smooth before applying next finished foam block representing Tay lorcraft cowl Recessing cutouts about s stronger structure Two cowls set wheel pants being readied molding paste waxes Butchers Tree wax Johnsons wax used white Masonite working base boards Dont use wax plug Don t use five-minute epoxy kind work Polyester resin comes four types 1 Gel coat resin usually colors first coat applied layup work 2 Laminating resin general-purpose layup resin no wax stays tacky cured about week cannot sanded 3 Finishing resin general-purpose resin wax used finishing since easily sanded resin must sanded between coats 4 Tooling resin used making molds four resins can thinned styrene acetone after mixing cat alyst Brushes may cleaned acetone Dont try save polyester after mix ing wontkeep Finishing plug intend add panel lines plug before fin ish applied Press cut lines plug remain visible ap ply resin Bolt plug down piece 34-in ply something similar placing slick smooth piece Masonite Formica tween plug mounting board Coat piece paste wax prevent plug sticking youre using epoxy finish however wax wont work thin piece vinyl will serve same purpose Have tub black dye available good paint store handy mix res wood plug dye covers grain foam turns material black bet ter visibility begin sanding fin ish Unsanded areas will show up shiny Mix first batch resin add little black dye thin 50% Apply mix ture plug Allow first application soak thoroughly Set plug aside cure cleaning brushes next coat applied unthinned February 1990 57 Wheel pant molds PJ 295 left mold has removed plug right still place Normally its best make plug black resin contrasts molding material making easier spot imperfections thin spots during molding 1 nis tne right half split cowl mold laid up its Masonite base backing sheet attached using three coats resin Shown center half split plug ply backplate showing max-width cross line 10-32 T-nuts dowels used attaching aligning two halves plug U two plug halves put together split plug will make cowling big Lazy Ace temporary backing plate T-nut screwing onto plug back its possi ble clamp plug vise angle Lazy Ace cowl split plug being shaped scraped sanded finishing cowl now clamped upright ta ble finishing air inlets small vise used sharpening scraping blade youre using polyester finishing resin ap ply second coat within 30 minutes first-coat application first coat has gelled gone dull wait too long youll have sand between coats Ideally either polyester epoxy three coats should applied before sand ing becomes necessary Dont allow resin run drip merely creates sand off later After third coat resin has ap plied start sanding scraping Sandpa per removes conspicuous roughness scrapers fine work Glass shards make great scrapers course must handled caution piece stainless steel about 050-in thick 450 edge filed side another good possibility several pieces can shaped fit con tours required Keep tool edges sharp file grinder hones steel edges glass cutter handy renewing edges glass Dont worry accidentally sand through resin spots sanding complete fill bare spots resin thickened little sanding dust Once damaged area filled cured sand smooth apply another coat resin entire plug youve sanded en tire plug absolutely smooth break ing through finish youre ready ap ply final coat resin Thin finish coat cover sanding marks thoroughly cured lightly sand first 150-grit paper blunt roughness remove dust particles wet sand Begin 320-wet work up 500-wet glass-smooth finish satisfied allow dry thoroughly before painting Use gloss-white lacquer color contrasts color mold can see what youre doing during layup Paint black youre going sent molding make white molds Making mold basic materials clude can butchers wax container polyvinyl alchohol PVA good sup ply fiberglass cloth mat PVA li quefied vinyl impervious resins can brushed sprayed removed warm water Open can PVA check its color before buying should red green product brown reject indicates contamination Transfer PVA can sealable glass bot tle immediately after purchase since trace rust will contaminate point plug should painted polished sitting its bare board Ap ply least three coats wax wiping off excess paper towel letting coat dry about 15 minutes before buf fing sure wax extends bottom base board Allow final coat stand several hours overnight before buffing out plug will have electromagnetic charge attracts dust Gently wiping down plug rag lightly sprayed little Fantasy similar brand spray cleaner will remove dust neutralize charge careful overdo spray cleaner itll also remove wax Brush spray PVA coat thats necessary Dont polish wipe plug Also despite what may have read attempting apply wax over PVA doesnt work know firsthand expe rience gel coat can now applied youre using epoxy mix up enough cover plug Add black dye ep oxy too thin tends run some tal cum powder Coat entire plug white fully covered extending coat about around base Once has begun harden mix epoxy begin applying glass mat Mat comes two weights 34 oz 1 /2 oz 34 -oz density works best Cut strip about 8 wide Roll up tightly twisting vigorously hands soften unroll strip cut 4-in-wide pieces Starting corners tear 4-in pieces half Dou ble overlap pieces lay up Lightweight fiberglass cloth will work just well glass cloth sold weight per square yard varies thickness material Lightweight cloth 2 4 oz Dont use fiberglass cur tains theyre treated purposes Start 1-in strip around base about out plug area must thick enough keep mold warping once its free Apply overlapping layers cloth top extending down over base Build up least two layers lay up another 1-in strip around base Set aside cure 24 hours Sand overlaps apply another coat res set aside three five days age 58 Model Aviation Some tools making plug far left hacksaw blade set wood block used making panel lines various files scrapers sanding blocks foam file Top Flite P-Si piug being readiedThe same P51 plug after both sides have painting black lacquer dry ItHere P-Si plug fence around itbeen laid up After its cured its split apart will polished waxed preparation forfor creating two-piece mold Its ready athe edges trimmed its ready beginning process laying up moldcoat PVA begin laying up moldprepare molding process begin around 700 Epoxy takes seven days 770 properly age thus minimizing risk mold warpage After aging period remove plug its base trim edge band saw sander leaving edge approxi mately /2 mold Especially one-piece mold air compressor almost necessity remov ing plug mold device will also help remove parts mold after youve made dont have com pressor rent buy borrow re move two-piece mold spread outer edges slightly work small knife enough create air passage blow some air plug should pop right out same other half youre ready wash PVA out warm water one-piece mold little diffi cult air compressor really comes its own After trimming edge mold begin lightly tapping entire mold rubber hammer sep arates mold plug just enough al low air introduced Drill hole top air inlet use compressor remove plug hole will used again later remove part mold directing air pressure through hole fails remove plug theres alterna tive method should work Blow air around bottom edge base stall long screw base grip screw vice gently work mold loose upward pressure edge Once free wash out PVA warm water polyester mold made basically same manner epoxy finish ing resin however contains wax Remove wax gently wiping down hard ened surface rag lightly soaked ac etone Let gel coat set about 30 minutes Check make sure doesnt come off touch apply cloth resin two layers its hard enough sand blend oYerlaps smooth final coat consists resin Allow set 24 hours long enough age polyester Separate plug mold using same methods outlined above Wash out PVA mold now com pleted yciure ready make some parts Laying up part Look mold over carefully inside edge little ragged smooth out wet sanding polish auto rubbing compound Give entire mold light polishing wax thoroughly least three times butchers wax just did plug Let set couple hours polish final time apply coat PVA Cover drilled air hole small piece tape make sure stays clear technique laying up part es sentially same whether using epoxy polyester curing times differ Mix up batch resin wet down inside Continued page 161 Bulkhead Fittings Fourmost Bulkhead Fitting s simple method feed fuel vent lines through solid bulkheads 1 Drill hole No 18 drill size bulkhead firewall up 3/8 thick 2 Insert shaft Bulkhead Fitting through hole 3 Screw nut onto backside fitting 4 Slip fuel vent tubes lob done Bulkhead Fittings provide sealed tank compartment eliminate fuel line chafing Color coded easy identification Weight 1/2 gram Price 2 $295 No 121 FOURMOST PRODUCTS Size 3/32 lD 4040 24th Avenue Forest Grove OR 97116 503 357-2732 February 1990 59 KJ Put Fun Back Fun Fly Get ROUN TUIT Today Its round S flat flies 30 Flying DISC STOL SUPERIOR Small Field S FUN FLY Aircraft STABLE PREDICTABLE S AGILE VISA Foam ft Lite Ply conairuction ELEVON Mixer Included 25-45 cid d 3-35Ibe Accurate QUALITY Matenala Mild Conat Time HOVERABLE Durable UNUSUAL Will NOT Spin itonded Model Products Box 10996 Suite 543 Austin TX 78766 512 250-1420 5124443368 ONLY Money Back GUARANTEE Business SIMPLY THE BEST may cost little fact is.. cant buy effective easier use soft mount PERIOD UNIVERSAL 2-cycle engines 20 61 EVERYTHING INCLUDED p Available Hobby Dealer order direct add $175 fer abplng MADE IN us manufacturer DISC-LOCK & HUSH FOAM dealer -distrbiIoeshs invited PERFORMANCE PRODUCTS UNLIMITED 7 7093 E Dodge Rd Mt Morris MI 48458 Phone orders 313 631-4894 Visa/MG accep VIBRA-DA BEAMS MP 21 50 VIBRA-DAMP $1095 ALUM TABS GATOR RIC PRODUCTS TIGER TAIL 4S DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offl oalsa kit machined wood parts complete hardwaie package includes plug-in djustable stab parts new wing mounts Wing Span -72 inWing ArHa 860 sq Complete Delux KitSi 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp S 1995 MV-I TYPHOON New F3A competition Big beautiful flyer -balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheetsS 1495 Fiberglass cowlSI B95 Clear butyrate canopy. S 995 OTHER PLANS Tiger Tail 4S-two sheets t 20 four strokes51495 TAB baby 120 four strokesS 1195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sportS 895 Bobcat 40 size sportS 895 GATOR SOFT MOUNTS COMPLErE SOFT MOUNTS INCLUDES ALL HARD WAREI Optimized lowest vibration transmission airframe minimizing engine shake Available YS-60 OS-60$1495 SOFT MOUNT COMPONENTS 4-lug Mounting Plate 606t-T-6 black anodized Undrilled. 559S Drilled VS-itO 05-60. S 695 Rubber Iso-Mounts 518 diameter x t long 8-32 female end 8-32 x 112 male other end Specify soft ISO durometer-yellowl firm 60 durometer-purple Each. S3OOPkg 4S995 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling est Finished Weight Big 3 Sq Yard Pkg Detailed Instructions 5895 Include $2 5Olltem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 325t4 1 476-8639 Best Show Mark Lattimore goal try pass Racing hints much help can need help have some neat trick really works about sharing Send hints and/or ideas will print Ill give credit about Please support NMPRA group re sponsible getting us today information write Ron Schorr 5224 Teesdale N Hollywood CA 91607 See next month RC Helicopters/Jolly Continued train page 55 against clock making naturally fun con test sharpens skills also ring-pickup contest use Helicopters landing skid lift ring rings get smaller effort gets greater also limbo event try place machine under crepe paper limbo bar event sometimes accompanied teresting sounds rotors greet limbo pole No major damage inflictedits part fun also Helicopters work pilot must lift weighted sling load fly cir cuit drop load off another station last two events perennial favorites first being Fun Scale Honestly its fact Scale competition Merced far tougher AMA Nationals fact wouldnt bad idea get fund set up send guy wins Scale Merced following Nats year Pat Brady won Scale Chan nel 3 News Jet Ranger Pat also won last year kind expected him show up Nats Oh well t time Second place Nats Champion Silas Kuok gorgeous scratch-built SA 341 Gazelle third place Walt Ferars super GMP Santini Air Jet Ranger Helicopters class looked super also flew well last event held autorosasions spot held late Sunday afternoon fa vorite spectator event class favorite Robert Gorham can put Helicopter middle spot nine times out 10with 10th being just slightly off center year however Robert challenged Dan Melnik Kalt group Dan actually tied Robert first place since fac tory pilots relinquished prizes thirdplace finisher Walt Ferar GMP Legend Also seen ausorosation Mike Mas proceeded fly Champion tail-first spot auto Oh wonders driven taileh Mike So what new year far products concerned Helicopters Unlimited Century Imports rep resentative Peter Chow first person stopped see Peter has super Larry Jolly Model Products Airwolf display well own little EH-100 electric-powered Helicopter should see little Electric right after first year Ill report further soon available Hobby Dynamics JR Radios representatives Dan Melnik Frank Dykes showed Kalt line Helicopters JR radios Dan gave some spectacular demos Kalts new Excalibur aer obasic machine proving its 91 gear ra tio its bit equal other 60-size rocket ships Gorham Model Products Rebels flying con tinuously including built local hobby shop owner flew free flight over four min utes result either dead batteries switch failure machine hovered around ran out fuel landedan incredible featshowing just stable Rebel Also display GMPs new FAI mechanics done yet getting closer nailing down design Robert Gorham gave spectacular dem os both Saturday Sunday showing us way wish could fly Incredible Rob ert incredible Robbe s representative Mike Mas gave some great demos Champion showing us just good design really thats ahout rest us just great time flying talking Helicopters though lot folks taking Mer ced days theres still room So get out 1990 calendar mark off last weekend September Well see BCNU Make Mold/Pickard Continued page 59 mold lay small pieces cloth us ing crisscross pattern side side top bottom Leave about ing out Wet down entire cloth layer until see black Lay second layer R/C SEMI-KIT stock ORIe iqiines invited SHORT KITS INCLUDE STYF OPOADi WINO CORES CANOPIES COWL5 PLA55 ENOINE MOUNTS FIREWALLS MOLSED i55C PAR5S 5OME HARDWARE AND MATERIALS LIST FOR RALIA Ass ADDITIONAL OFF STE 5RELP ITEMS AGM2 ZERO 54 5PAN3750 PRO SOMAEAWE 55SPAS2750 P 55 AIRACOBRA 55SPAN35 55 9515 MASSANO SR5PAN3750 252 POLOORE 555PAN3750 POCRE WALE 1W SR SPAN 37 55 A26 iNVAOER 65 SPAN 95 P38LIOHONiNG 70 SPAN 7495 PRO CORSAIR 56 SPAN 5 ORDERING SEND CHECK OR MONKS ORDER FOR REQUiRED ARRO5NS PLAS 5450 PER KIT CANADIANS ADD S750I ILLINOiS RESIDENTS ASS AR% SAD WING Mfg 306 E Simmons Galesburg IL 61401 DR 59 0D0tt 94 H6 0 WHEN YOU FORGET\OUR UNITS REMEMBER RC System NICd Batteries Alt chargers need- tn packaget 6V Tx packsPlus $5 S&HGelled Cell Others available write call TrickIer $3496 ForPlus $3 SB-HRegular Model 6 Multiple~eC4For held kit small Plus $3 SB-H Radioselectric boat battenes Specify 612 24V CDHeavy Duty Model $5896 sport winch large boat andPlus $4 SB-H electric power charging batteriesSpecify 6 1 2V CaRa Products SASE br iticimabcePO BOx 221 Oerirtqurnmmnsiied Canton SD 57013 February 1990 161 overlapping cloth pieces until youve covered entire mold twice Make sure resin doesnt pooi bottom Lay mold its side keep turning over couple minutes un til begins kick off Leave epoxy part mold least three days poly ester part should left overnight part light heavy fiber glass its made youre removing very lightweight part mold careful compressor could turn part inside out Youre better off leaving -in cloth overlap around edge extra bulk Heavier parts can blown out relative ease After removing part wash mold water dry thor oughly rewax apply another coat PVA Youre ready mold another part Advice If problems develop have difficulty working out Ill gladly try help please dont telephone Send SASE along description prob lem MH Pickard Fiberglass Master Inc Rt 1 Box 530 Goodview VA 24095 Fiberglass Corporation good source supplies youll need preparing plugs casting molds parts Contact company 1944 Neva Dr Dayton OH 45414 telephone 1-800/821-3283 1513/274-1 159 Ohio good source polyurethane foam contact St Rux Corp 100 E Montauk Hwy Lindenhurst NY 11757 telephone 1-516/9578000 FF Duration/Murphy Continued page 61 However Elfins popularity has recently sky rocketed SAM Society Antique Model ers Class events became apparent probably powerful trouble-free its ignition contemporaries such old Class standbys Arden 199 Ohlsson 19 Bantam 19 etc Having declared legal SAM competi tions British-made Elfin 249 repro-engines have certainly made imprint instance however supplies currently exhausted Argo-USA has recently issued notice due hundreds requests diesel now manufactured right US well-known reliable manufacturer Ap parently laws supply demand still valid certainly good news Should re quire additional information price availability new repro venture just write Argo-USA. 3229 Dianora Dr Palos Verdes Peninsula CA 90274 Tell em Duration told about engine info comes us Phil McCary/Larry Jenno venture modifies minute Cox 020 Pee Wee engine accept ven turi system reminiscent old TD Thermal Hopper modification also includes custommade three-prong radial engine mount Natural ly intent hop-up effort use Pee Wee 30 event first question comes mind results Well mounted business end model designed Charlie Atkinson called Hi-Roller obviously stemming Las Vegas won Phil Larry first second places 1989 US Free Flight Champs last May also entrants max out Phil claims 18000-20000 rpm 40%-nitro fuel using standard 45 x 2 Cox gray plastic prop cut down 425 x 2 prop blades also thinned some balanced Phil Larry like start early thinwalled-cylinder 020s claiming have better piston/cylinder fits what currently being produced reed body machined off tank intake tube cut down collar made fit over intake tube threaded ac cept Cox TD 020 venturi needle valve sembly gas tank machined off meth ods mounting engine thereby elimi nated new three-pronged adapter mount machined hard aluminum fulfill re quirement Thats What see what get Technically appears start good engine put TD 020 needle valve sembly itbut sure looks nice too Hi-Roller sports 8% airfoil wing 6% stab Both wing stab undercambered Should wish additional infor mation engines model both send SASE Phil McCary Jr 532 College Dr 2l2 Henderson NV 89015 Personally think ventures such healthy model competition though takes place so-called beginners event Im too sure Pee Wee 30 constitutes beginners event anyway since seems competi tors area contest circles participate have flying Free Flight years Maybe should listed under heading fun event instead FF event fun particular event liking dividual However FFers like same events reason have eventsand put tachometer stock Cox Pee Wee 020 fall belonged Bill Hale Basic Yeller fame see Duration column August 1988 sounded great clocked 19000 rpm asked him hopped up said did take out bubble pack came run Granted differences tachometers atmospheric conditions point apparently stock en gines around can hold own hopped-up versions rate Pee Wee 30 event continues roll along competition will naturally get stifferand what can detrimental rest case Gary Buddenbohm sent sample kits Silly Putty DT Systems brother Stan pro duce kits result trying nearly 50 prototype systems before achieving current de sign As mute testimony questions regard ing merits final system Stan won Hand-Launched Glider event 89 AMA Nats using SDT system Gliders took kits CIA Central Indiana Aeromodel ers club meeting recently generated considerable interest Although Ive mentioned gadget col umn before Ill repeat tab $5 either HLG Small Rubber kit cludes appropriate instructions Want mailing address SDT Systems 5652 Mainhardt Rd Westminster CA 92683 Take fire haz ard out flying try Preventive maintenance department beauty neatly covered fuselage framework Continued page 166 162 Model Aviation Name Street Address City 7in
Edition: Model Aviation - 1990/02
Page Numbers: 56, 57, 58, 59, 161, 162
Making own Parts fiberglass plugs Fiberglass molds d can save some bucks giving a great sense satisfaction job well done its something youve always wanted door youre just curious about its doneread EMH Pickard FOR THE MODELER wants rise challenge just save few bucks story mold fiberglass part Though takes lot work some careful planning right its definitely economical goes well youll save little under two-thirds cost having average part professionally made procedure outlined making mold can used produce part Though production mold will give three four parts youre careful Begin accurate drawing drawing must represent exactly what needed unless carving mod el Two-piece parts such cheek cowls wheel pants must planned ginning Also configuration de sired part such one-piece mold wont work two-piece plug will neces sary can made up two pieces A-in plywood cut shape cen terline part fitted waxed dowels alignment separation plug material can glued ply bases carved shape Plug materials may hardwood balsa foam anything else can take hard finish Finishing surface plug critical slightest imperfection will reflected moldand finished part Take time carefully choosing plug material keep following considerations mind Hard wood easiest finish takes time patience carve Balsa other hand easier carve difficult finish since finish has wood rather its surface later Finally foam available two ba sic types Polyester foam found blue white green white coffee cups packing etc very soft touch very difficult sand blue dock flota tion etc too porous purposes preferred polyester green type used florists hold flowers etc quite dense soft easy shape sand Polyurethane foam available white brown used insulation buildings flotation boats etc comes various weights 2 24 lb per cu ft lower number softer foam Six pounds seems ideal density mak ing plug since its easy sand shape finish Finishing materials pine poplar plug may finished hard material Dope lacquer epoxy polyester work quite well Balsa may finished same ma terials first coat must thinned 50% allowed soak wood Af ter first application has hardened plug has sanded three unthinned coats should applied Polyurethane foam plugs may finished epoxy polyester Use epoxy however polyester foam anything else will melt down Dope lacquer can thinned lac quer thinner acetone Epoxies come two formsthick gluing parts thin layup work Both types can thinned alcohol Work small batches Afterthe catalyst thoroughly mixed sealable jar alco hol wood methanol can added little time until epoxy will flow soak easily Thinned epoxy takes longer cure alcohol requires time evapo rate mixed too much seal con tainer store surplus freezer Itll keep about week Brushes can cleaned alcohol soap water 56 Model Aviation base block establishes outline cowl centerline maxwidth cross line have scribed block has bonded foam block un der two T-nuts have installed plug base first coat black res Three coats resin required sanded smooth before applying next finished foam block representing Tay lorcraft cowl Recessing cutouts about s stronger structure Two cowls set wheel pants being readied molding paste waxes Butchers Tree wax Johnsons wax used white Masonite working base boards Dont use wax plug Don t use five-minute epoxy kind work Polyester resin comes four types 1 Gel coat resin usually colors first coat applied layup work 2 Laminating resin general-purpose layup resin no wax stays tacky cured about week cannot sanded 3 Finishing resin general-purpose resin wax used finishing since easily sanded resin must sanded between coats 4 Tooling resin used making molds four resins can thinned styrene acetone after mixing cat alyst Brushes may cleaned acetone Dont try save polyester after mix ing wontkeep Finishing plug intend add panel lines plug before fin ish applied Press cut lines plug remain visible ap ply resin Bolt plug down piece 34-in ply something similar placing slick smooth piece Masonite Formica tween plug mounting board Coat piece paste wax prevent plug sticking youre using epoxy finish however wax wont work thin piece vinyl will serve same purpose Have tub black dye available good paint store handy mix res wood plug dye covers grain foam turns material black bet ter visibility begin sanding fin ish Unsanded areas will show up shiny Mix first batch resin add little black dye thin 50% Apply mix ture plug Allow first application soak thoroughly Set plug aside cure cleaning brushes next coat applied unthinned February 1990 57 Wheel pant molds PJ 295 left mold has removed plug right still place Normally its best make plug black resin contrasts molding material making easier spot imperfections thin spots during molding 1 nis tne right half split cowl mold laid up its Masonite base backing sheet attached using three coats resin Shown center half split plug ply backplate showing max-width cross line 10-32 T-nuts dowels used attaching aligning two halves plug U two plug halves put together split plug will make cowling big Lazy Ace temporary backing plate T-nut screwing onto plug back its possi ble clamp plug vise angle Lazy Ace cowl split plug being shaped scraped sanded finishing cowl now clamped upright ta ble finishing air inlets small vise used sharpening scraping blade youre using polyester finishing resin ap ply second coat within 30 minutes first-coat application first coat has gelled gone dull wait too long youll have sand between coats Ideally either polyester epoxy three coats should applied before sand ing becomes necessary Dont allow resin run drip merely creates sand off later After third coat resin has ap plied start sanding scraping Sandpa per removes conspicuous roughness scrapers fine work Glass shards make great scrapers course must handled caution piece stainless steel about 050-in thick 450 edge filed side another good possibility several pieces can shaped fit con tours required Keep tool edges sharp file grinder hones steel edges glass cutter handy renewing edges glass Dont worry accidentally sand through resin spots sanding complete fill bare spots resin thickened little sanding dust Once damaged area filled cured sand smooth apply another coat resin entire plug youve sanded en tire plug absolutely smooth break ing through finish youre ready ap ply final coat resin Thin finish coat cover sanding marks thoroughly cured lightly sand first 150-grit paper blunt roughness remove dust particles wet sand Begin 320-wet work up 500-wet glass-smooth finish satisfied allow dry thoroughly before painting Use gloss-white lacquer color contrasts color mold can see what youre doing during layup Paint black youre going sent molding make white molds Making mold basic materials clude can butchers wax container polyvinyl alchohol PVA good sup ply fiberglass cloth mat PVA li quefied vinyl impervious resins can brushed sprayed removed warm water Open can PVA check its color before buying should red green product brown reject indicates contamination Transfer PVA can sealable glass bot tle immediately after purchase since trace rust will contaminate point plug should painted polished sitting its bare board Ap ply least three coats wax wiping off excess paper towel letting coat dry about 15 minutes before buf fing sure wax extends bottom base board Allow final coat stand several hours overnight before buffing out plug will have electromagnetic charge attracts dust Gently wiping down plug rag lightly sprayed little Fantasy similar brand spray cleaner will remove dust neutralize charge careful overdo spray cleaner itll also remove wax Brush spray PVA coat thats necessary Dont polish wipe plug Also despite what may have read attempting apply wax over PVA doesnt work know firsthand expe rience gel coat can now applied youre using epoxy mix up enough cover plug Add black dye ep oxy too thin tends run some tal cum powder Coat entire plug white fully covered extending coat about around base Once has begun harden mix epoxy begin applying glass mat Mat comes two weights 34 oz 1 /2 oz 34 -oz density works best Cut strip about 8 wide Roll up tightly twisting vigorously hands soften unroll strip cut 4-in-wide pieces Starting corners tear 4-in pieces half Dou ble overlap pieces lay up Lightweight fiberglass cloth will work just well glass cloth sold weight per square yard varies thickness material Lightweight cloth 2 4 oz Dont use fiberglass cur tains theyre treated purposes Start 1-in strip around base about out plug area must thick enough keep mold warping once its free Apply overlapping layers cloth top extending down over base Build up least two layers lay up another 1-in strip around base Set aside cure 24 hours Sand overlaps apply another coat res set aside three five days age 58 Model Aviation Some tools making plug far left hacksaw blade set wood block used making panel lines various files scrapers sanding blocks foam file Top Flite P-Si piug being readiedThe same P51 plug after both sides have painting black lacquer dry ItHere P-Si plug fence around itbeen laid up After its cured its split apart will polished waxed preparation forfor creating two-piece mold Its ready athe edges trimmed its ready beginning process laying up moldcoat PVA begin laying up moldprepare molding process begin around 700 Epoxy takes seven days 770 properly age thus minimizing risk mold warpage After aging period remove plug its base trim edge band saw sander leaving edge approxi mately /2 mold Especially one-piece mold air compressor almost necessity remov ing plug mold device will also help remove parts mold after youve made dont have com pressor rent buy borrow re move two-piece mold spread outer edges slightly work small knife enough create air passage blow some air plug should pop right out same other half youre ready wash PVA out warm water one-piece mold little diffi cult air compressor really comes its own After trimming edge mold begin lightly tapping entire mold rubber hammer sep arates mold plug just enough al low air introduced Drill hole top air inlet use compressor remove plug hole will used again later remove part mold directing air pressure through hole fails remove plug theres alterna tive method should work Blow air around bottom edge base stall long screw base grip screw vice gently work mold loose upward pressure edge Once free wash out PVA warm water polyester mold made basically same manner epoxy finish ing resin however contains wax Remove wax gently wiping down hard ened surface rag lightly soaked ac etone Let gel coat set about 30 minutes Check make sure doesnt come off touch apply cloth resin two layers its hard enough sand blend oYerlaps smooth final coat consists resin Allow set 24 hours long enough age polyester Separate plug mold using same methods outlined above Wash out PVA mold now com pleted yciure ready make some parts Laying up part Look mold over carefully inside edge little ragged smooth out wet sanding polish auto rubbing compound Give entire mold light polishing wax thoroughly least three times butchers wax just did plug Let set couple hours polish final time apply coat PVA Cover drilled air hole small piece tape make sure stays clear technique laying up part es sentially same whether using epoxy polyester curing times differ Mix up batch resin wet down inside Continued page 161 Bulkhead Fittings Fourmost Bulkhead Fitting s simple method feed fuel vent lines through solid bulkheads 1 Drill hole No 18 drill size bulkhead firewall up 3/8 thick 2 Insert shaft Bulkhead Fitting through hole 3 Screw nut onto backside fitting 4 Slip fuel vent tubes lob done Bulkhead Fittings provide sealed tank compartment eliminate fuel line chafing Color coded easy identification Weight 1/2 gram Price 2 $295 No 121 FOURMOST PRODUCTS Size 3/32 lD 4040 24th Avenue Forest Grove OR 97116 503 357-2732 February 1990 59 KJ Put Fun Back Fun Fly Get ROUN TUIT Today Its round S flat flies 30 Flying DISC STOL SUPERIOR Small Field S FUN FLY Aircraft STABLE PREDICTABLE S AGILE VISA Foam ft Lite Ply conairuction ELEVON Mixer Included 25-45 cid d 3-35Ibe Accurate QUALITY Matenala Mild Conat Time HOVERABLE Durable UNUSUAL Will NOT Spin itonded Model Products Box 10996 Suite 543 Austin TX 78766 512 250-1420 5124443368 ONLY Money Back GUARANTEE Business SIMPLY THE BEST may cost little fact is.. cant buy effective easier use soft mount PERIOD UNIVERSAL 2-cycle engines 20 61 EVERYTHING INCLUDED p Available Hobby Dealer order direct add $175 fer abplng MADE IN us manufacturer DISC-LOCK & HUSH FOAM dealer -distrbiIoeshs invited PERFORMANCE PRODUCTS UNLIMITED 7 7093 E Dodge Rd Mt Morris MI 48458 Phone orders 313 631-4894 Visa/MG accep VIBRA-DA BEAMS MP 21 50 VIBRA-DAMP $1095 ALUM TABS GATOR RIC PRODUCTS TIGER TAIL 4S DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offl oalsa kit machined wood parts complete hardwaie package includes plug-in djustable stab parts new wing mounts Wing Span -72 inWing ArHa 860 sq Complete Delux KitSi 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp S 1995 MV-I TYPHOON New F3A competition Big beautiful flyer -balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheetsS 1495 Fiberglass cowlSI B95 Clear butyrate canopy. S 995 OTHER PLANS Tiger Tail 4S-two sheets t 20 four strokes51495 TAB baby 120 four strokesS 1195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sportS 895 Bobcat 40 size sportS 895 GATOR SOFT MOUNTS COMPLErE SOFT MOUNTS INCLUDES ALL HARD WAREI Optimized lowest vibration transmission airframe minimizing engine shake Available YS-60 OS-60$1495 SOFT MOUNT COMPONENTS 4-lug Mounting Plate 606t-T-6 black anodized Undrilled. 559S Drilled VS-itO 05-60. S 695 Rubber Iso-Mounts 518 diameter x t long 8-32 female end 8-32 x 112 male other end Specify soft ISO durometer-yellowl firm 60 durometer-purple Each. S3OOPkg 4S995 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling est Finished Weight Big 3 Sq Yard Pkg Detailed Instructions 5895 Include $2 5Olltem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 325t4 1 476-8639 Best Show Mark Lattimore goal try pass Racing hints much help can need help have some neat trick really works about sharing Send hints and/or ideas will print Ill give credit about Please support NMPRA group re sponsible getting us today information write Ron Schorr 5224 Teesdale N Hollywood CA 91607 See next month RC Helicopters/Jolly Continued train page 55 against clock making naturally fun con test sharpens skills also ring-pickup contest use Helicopters landing skid lift ring rings get smaller effort gets greater also limbo event try place machine under crepe paper limbo bar event sometimes accompanied teresting sounds rotors greet limbo pole No major damage inflictedits part fun also Helicopters work pilot must lift weighted sling load fly cir cuit drop load off another station last two events perennial favorites first being Fun Scale Honestly its fact Scale competition Merced far tougher AMA Nationals fact wouldnt bad idea get fund set up send guy wins Scale Merced following Nats year Pat Brady won Scale Chan nel 3 News Jet Ranger Pat also won last year kind expected him show up Nats Oh well t time Second place Nats Champion Silas Kuok gorgeous scratch-built SA 341 Gazelle third place Walt Ferars super GMP Santini Air Jet Ranger Helicopters class looked super also flew well last event held autorosasions spot held late Sunday afternoon fa vorite spectator event class favorite Robert Gorham can put Helicopter middle spot nine times out 10with 10th being just slightly off center year however Robert challenged Dan Melnik Kalt group Dan actually tied Robert first place since fac tory pilots relinquished prizes thirdplace finisher Walt Ferar GMP Legend Also seen ausorosation Mike Mas proceeded fly Champion tail-first spot auto Oh wonders driven taileh Mike So what new year far products concerned Helicopters Unlimited Century Imports rep resentative Peter Chow first person stopped see Peter has super Larry Jolly Model Products Airwolf display well own little EH-100 electric-powered Helicopter should see little Electric right after first year Ill report further soon available Hobby Dynamics JR Radios representatives Dan Melnik Frank Dykes showed Kalt line Helicopters JR radios Dan gave some spectacular demos Kalts new Excalibur aer obasic machine proving its 91 gear ra tio its bit equal other 60-size rocket ships Gorham Model Products Rebels flying con tinuously including built local hobby shop owner flew free flight over four min utes result either dead batteries switch failure machine hovered around ran out fuel landedan incredible featshowing just stable Rebel Also display GMPs new FAI mechanics done yet getting closer nailing down design Robert Gorham gave spectacular dem os both Saturday Sunday showing us way wish could fly Incredible Rob ert incredible Robbe s representative Mike Mas gave some great demos Champion showing us just good design really thats ahout rest us just great time flying talking Helicopters though lot folks taking Mer ced days theres still room So get out 1990 calendar mark off last weekend September Well see BCNU Make Mold/Pickard Continued page 59 mold lay small pieces cloth us ing crisscross pattern side side top bottom Leave about ing out Wet down entire cloth layer until see black Lay second layer R/C SEMI-KIT stock ORIe iqiines invited SHORT KITS INCLUDE STYF OPOADi WINO CORES CANOPIES COWL5 PLA55 ENOINE MOUNTS FIREWALLS MOLSED i55C PAR5S 5OME HARDWARE AND MATERIALS LIST FOR RALIA Ass ADDITIONAL OFF STE 5RELP ITEMS AGM2 ZERO 54 5PAN3750 PRO SOMAEAWE 55SPAS2750 P 55 AIRACOBRA 55SPAN35 55 9515 MASSANO SR5PAN3750 252 POLOORE 555PAN3750 POCRE WALE 1W SR SPAN 37 55 A26 iNVAOER 65 SPAN 95 P38LIOHONiNG 70 SPAN 7495 PRO CORSAIR 56 SPAN 5 ORDERING SEND CHECK OR MONKS ORDER FOR REQUiRED ARRO5NS PLAS 5450 PER KIT CANADIANS ADD S750I ILLINOiS RESIDENTS ASS AR% SAD WING Mfg 306 E Simmons Galesburg IL 61401 DR 59 0D0tt 94 H6 0 WHEN YOU FORGET\OUR UNITS REMEMBER RC System NICd Batteries Alt chargers need- tn packaget 6V Tx packsPlus $5 S&HGelled Cell Others available write call TrickIer $3496 ForPlus $3 SB-HRegular Model 6 Multiple~eC4For held kit small Plus $3 SB-H Radioselectric boat battenes Specify 612 24V CDHeavy Duty Model $5896 sport winch large boat andPlus $4 SB-H electric power charging batteriesSpecify 6 1 2V CaRa Products SASE br iticimabcePO BOx 221 Oerirtqurnmmnsiied Canton SD 57013 February 1990 161 overlapping cloth pieces until youve covered entire mold twice Make sure resin doesnt pooi bottom Lay mold its side keep turning over couple minutes un til begins kick off Leave epoxy part mold least three days poly ester part should left overnight part light heavy fiber glass its made youre removing very lightweight part mold careful compressor could turn part inside out Youre better off leaving -in cloth overlap around edge extra bulk Heavier parts can blown out relative ease After removing part wash mold water dry thor oughly rewax apply another coat PVA Youre ready mold another part Advice If problems develop have difficulty working out Ill gladly try help please dont telephone Send SASE along description prob lem MH Pickard Fiberglass Master Inc Rt 1 Box 530 Goodview VA 24095 Fiberglass Corporation good source supplies youll need preparing plugs casting molds parts Contact company 1944 Neva Dr Dayton OH 45414 telephone 1-800/821-3283 1513/274-1 159 Ohio good source polyurethane foam contact St Rux Corp 100 E Montauk Hwy Lindenhurst NY 11757 telephone 1-516/9578000 FF Duration/Murphy Continued page 61 However Elfins popularity has recently sky rocketed SAM Society Antique Model ers Class events became apparent probably powerful trouble-free its ignition contemporaries such old Class standbys Arden 199 Ohlsson 19 Bantam 19 etc Having declared legal SAM competi tions British-made Elfin 249 repro-engines have certainly made imprint instance however supplies currently exhausted Argo-USA has recently issued notice due hundreds requests diesel now manufactured right US well-known reliable manufacturer Ap parently laws supply demand still valid certainly good news Should re quire additional information price availability new repro venture just write Argo-USA. 3229 Dianora Dr Palos Verdes Peninsula CA 90274 Tell em Duration told about engine info comes us Phil McCary/Larry Jenno venture modifies minute Cox 020 Pee Wee engine accept ven turi system reminiscent old TD Thermal Hopper modification also includes custommade three-prong radial engine mount Natural ly intent hop-up effort use Pee Wee 30 event first question comes mind results Well mounted business end model designed Charlie Atkinson called Hi-Roller obviously stemming Las Vegas won Phil Larry first second places 1989 US Free Flight Champs last May also entrants max out Phil claims 18000-20000 rpm 40%-nitro fuel using standard 45 x 2 Cox gray plastic prop cut down 425 x 2 prop blades also thinned some balanced Phil Larry like start early thinwalled-cylinder 020s claiming have better piston/cylinder fits what currently being produced reed body machined off tank intake tube cut down collar made fit over intake tube threaded ac cept Cox TD 020 venturi needle valve sembly gas tank machined off meth ods mounting engine thereby elimi nated new three-pronged adapter mount machined hard aluminum fulfill re quirement Thats What see what get Technically appears start good engine put TD 020 needle valve sembly itbut sure looks nice too Hi-Roller sports 8% airfoil wing 6% stab Both wing stab undercambered Should wish additional infor mation engines model both send SASE Phil McCary Jr 532 College Dr 2l2 Henderson NV 89015 Personally think ventures such healthy model competition though takes place so-called beginners event Im too sure Pee Wee 30 constitutes beginners event anyway since seems competi tors area contest circles participate have flying Free Flight years Maybe should listed under heading fun event instead FF event fun particular event liking dividual However FFers like same events reason have eventsand put tachometer stock Cox Pee Wee 020 fall belonged Bill Hale Basic Yeller fame see Duration column August 1988 sounded great clocked 19000 rpm asked him hopped up said did take out bubble pack came run Granted differences tachometers atmospheric conditions point apparently stock en gines around can hold own hopped-up versions rate Pee Wee 30 event continues roll along competition will naturally get stifferand what can detrimental rest case Gary Buddenbohm sent sample kits Silly Putty DT Systems brother Stan pro duce kits result trying nearly 50 prototype systems before achieving current de sign As mute testimony questions regard ing merits final system Stan won Hand-Launched Glider event 89 AMA Nats using SDT system Gliders took kits CIA Central Indiana Aeromodel ers club meeting recently generated considerable interest Although Ive mentioned gadget col umn before Ill repeat tab $5 either HLG Small Rubber kit cludes appropriate instructions Want mailing address SDT Systems 5652 Mainhardt Rd Westminster CA 92683 Take fire haz ard out flying try Preventive maintenance department beauty neatly covered fuselage framework Continued page 166 162 Model Aviation Name Street Address City 7in
Edition: Model Aviation - 1990/02
Page Numbers: 56, 57, 58, 59, 161, 162
Making own Parts fiberglass plugs Fiberglass molds d can save some bucks giving a great sense satisfaction job well done its something youve always wanted door youre just curious about its doneread EMH Pickard FOR THE MODELER wants rise challenge just save few bucks story mold fiberglass part Though takes lot work some careful planning right its definitely economical goes well youll save little under two-thirds cost having average part professionally made procedure outlined making mold can used produce part Though production mold will give three four parts youre careful Begin accurate drawing drawing must represent exactly what needed unless carving mod el Two-piece parts such cheek cowls wheel pants must planned ginning Also configuration de sired part such one-piece mold wont work two-piece plug will neces sary can made up two pieces A-in plywood cut shape cen terline part fitted waxed dowels alignment separation plug material can glued ply bases carved shape Plug materials may hardwood balsa foam anything else can take hard finish Finishing surface plug critical slightest imperfection will reflected moldand finished part Take time carefully choosing plug material keep following considerations mind Hard wood easiest finish takes time patience carve Balsa other hand easier carve difficult finish since finish has wood rather its surface later Finally foam available two ba sic types Polyester foam found blue white green white coffee cups packing etc very soft touch very difficult sand blue dock flota tion etc too porous purposes preferred polyester green type used florists hold flowers etc quite dense soft easy shape sand Polyurethane foam available white brown used insulation buildings flotation boats etc comes various weights 2 24 lb per cu ft lower number softer foam Six pounds seems ideal density mak ing plug since its easy sand shape finish Finishing materials pine poplar plug may finished hard material Dope lacquer epoxy polyester work quite well Balsa may finished same ma terials first coat must thinned 50% allowed soak wood Af ter first application has hardened plug has sanded three unthinned coats should applied Polyurethane foam plugs may finished epoxy polyester Use epoxy however polyester foam anything else will melt down Dope lacquer can thinned lac quer thinner acetone Epoxies come two formsthick gluing parts thin layup work Both types can thinned alcohol Work small batches Afterthe catalyst thoroughly mixed sealable jar alco hol wood methanol can added little time until epoxy will flow soak easily Thinned epoxy takes longer cure alcohol requires time evapo rate mixed too much seal con tainer store surplus freezer Itll keep about week Brushes can cleaned alcohol soap water 56 Model Aviation base block establishes outline cowl centerline maxwidth cross line have scribed block has bonded foam block un der two T-nuts have installed plug base first coat black res Three coats resin required sanded smooth before applying next finished foam block representing Tay lorcraft cowl Recessing cutouts about s stronger structure Two cowls set wheel pants being readied molding paste waxes Butchers Tree wax Johnsons wax used white Masonite working base boards Dont use wax plug Don t use five-minute epoxy kind work Polyester resin comes four types 1 Gel coat resin usually colors first coat applied layup work 2 Laminating resin general-purpose layup resin no wax stays tacky cured about week cannot sanded 3 Finishing resin general-purpose resin wax used finishing since easily sanded resin must sanded between coats 4 Tooling resin used making molds four resins can thinned styrene acetone after mixing cat alyst Brushes may cleaned acetone Dont try save polyester after mix ing wontkeep Finishing plug intend add panel lines plug before fin ish applied Press cut lines plug remain visible ap ply resin Bolt plug down piece 34-in ply something similar placing slick smooth piece Masonite Formica tween plug mounting board Coat piece paste wax prevent plug sticking youre using epoxy finish however wax wont work thin piece vinyl will serve same purpose Have tub black dye available good paint store handy mix res wood plug dye covers grain foam turns material black bet ter visibility begin sanding fin ish Unsanded areas will show up shiny Mix first batch resin add little black dye thin 50% Apply mix ture plug Allow first application soak thoroughly Set plug aside cure cleaning brushes next coat applied unthinned February 1990 57 Wheel pant molds PJ 295 left mold has removed plug right still place Normally its best make plug black resin contrasts molding material making easier spot imperfections thin spots during molding 1 nis tne right half split cowl mold laid up its Masonite base backing sheet attached using three coats resin Shown center half split plug ply backplate showing max-width cross line 10-32 T-nuts dowels used attaching aligning two halves plug U two plug halves put together split plug will make cowling big Lazy Ace temporary backing plate T-nut screwing onto plug back its possi ble clamp plug vise angle Lazy Ace cowl split plug being shaped scraped sanded finishing cowl now clamped upright ta ble finishing air inlets small vise used sharpening scraping blade youre using polyester finishing resin ap ply second coat within 30 minutes first-coat application first coat has gelled gone dull wait too long youll have sand between coats Ideally either polyester epoxy three coats should applied before sand ing becomes necessary Dont allow resin run drip merely creates sand off later After third coat resin has ap plied start sanding scraping Sandpa per removes conspicuous roughness scrapers fine work Glass shards make great scrapers course must handled caution piece stainless steel about 050-in thick 450 edge filed side another good possibility several pieces can shaped fit con tours required Keep tool edges sharp file grinder hones steel edges glass cutter handy renewing edges glass Dont worry accidentally sand through resin spots sanding complete fill bare spots resin thickened little sanding dust Once damaged area filled cured sand smooth apply another coat resin entire plug youve sanded en tire plug absolutely smooth break ing through finish youre ready ap ply final coat resin Thin finish coat cover sanding marks thoroughly cured lightly sand first 150-grit paper blunt roughness remove dust particles wet sand Begin 320-wet work up 500-wet glass-smooth finish satisfied allow dry thoroughly before painting Use gloss-white lacquer color contrasts color mold can see what youre doing during layup Paint black youre going sent molding make white molds Making mold basic materials clude can butchers wax container polyvinyl alchohol PVA good sup ply fiberglass cloth mat PVA li quefied vinyl impervious resins can brushed sprayed removed warm water Open can PVA check its color before buying should red green product brown reject indicates contamination Transfer PVA can sealable glass bot tle immediately after purchase since trace rust will contaminate point plug should painted polished sitting its bare board Ap ply least three coats wax wiping off excess paper towel letting coat dry about 15 minutes before buf fing sure wax extends bottom base board Allow final coat stand several hours overnight before buffing out plug will have electromagnetic charge attracts dust Gently wiping down plug rag lightly sprayed little Fantasy similar brand spray cleaner will remove dust neutralize charge careful overdo spray cleaner itll also remove wax Brush spray PVA coat thats necessary Dont polish wipe plug Also despite what may have read attempting apply wax over PVA doesnt work know firsthand expe rience gel coat can now applied youre using epoxy mix up enough cover plug Add black dye ep oxy too thin tends run some tal cum powder Coat entire plug white fully covered extending coat about around base Once has begun harden mix epoxy begin applying glass mat Mat comes two weights 34 oz 1 /2 oz 34 -oz density works best Cut strip about 8 wide Roll up tightly twisting vigorously hands soften unroll strip cut 4-in-wide pieces Starting corners tear 4-in pieces half Dou ble overlap pieces lay up Lightweight fiberglass cloth will work just well glass cloth sold weight per square yard varies thickness material Lightweight cloth 2 4 oz Dont use fiberglass cur tains theyre treated purposes Start 1-in strip around base about out plug area must thick enough keep mold warping once its free Apply overlapping layers cloth top extending down over base Build up least two layers lay up another 1-in strip around base Set aside cure 24 hours Sand overlaps apply another coat res set aside three five days age 58 Model Aviation Some tools making plug far left hacksaw blade set wood block used making panel lines various files scrapers sanding blocks foam file Top Flite P-Si piug being readiedThe same P51 plug after both sides have painting black lacquer dry ItHere P-Si plug fence around itbeen laid up After its cured its split apart will polished waxed preparation forfor creating two-piece mold Its ready athe edges trimmed its ready beginning process laying up moldcoat PVA begin laying up moldprepare molding process begin around 700 Epoxy takes seven days 770 properly age thus minimizing risk mold warpage After aging period remove plug its base trim edge band saw sander leaving edge approxi mately /2 mold Especially one-piece mold air compressor almost necessity remov ing plug mold device will also help remove parts mold after youve made dont have com pressor rent buy borrow re move two-piece mold spread outer edges slightly work small knife enough create air passage blow some air plug should pop right out same other half youre ready wash PVA out warm water one-piece mold little diffi cult air compressor really comes its own After trimming edge mold begin lightly tapping entire mold rubber hammer sep arates mold plug just enough al low air introduced Drill hole top air inlet use compressor remove plug hole will used again later remove part mold directing air pressure through hole fails remove plug theres alterna tive method should work Blow air around bottom edge base stall long screw base grip screw vice gently work mold loose upward pressure edge Once free wash out PVA warm water polyester mold made basically same manner epoxy finish ing resin however contains wax Remove wax gently wiping down hard ened surface rag lightly soaked ac etone Let gel coat set about 30 minutes Check make sure doesnt come off touch apply cloth resin two layers its hard enough sand blend oYerlaps smooth final coat consists resin Allow set 24 hours long enough age polyester Separate plug mold using same methods outlined above Wash out PVA mold now com pleted yciure ready make some parts Laying up part Look mold over carefully inside edge little ragged smooth out wet sanding polish auto rubbing compound Give entire mold light polishing wax thoroughly least three times butchers wax just did plug Let set couple hours polish final time apply coat PVA Cover drilled air hole small piece tape make sure stays clear technique laying up part es sentially same whether using epoxy polyester curing times differ Mix up batch resin wet down inside Continued page 161 Bulkhead Fittings Fourmost Bulkhead Fitting s simple method feed fuel vent lines through solid bulkheads 1 Drill hole No 18 drill size bulkhead firewall up 3/8 thick 2 Insert shaft Bulkhead Fitting through hole 3 Screw nut onto backside fitting 4 Slip fuel vent tubes lob done Bulkhead Fittings provide sealed tank compartment eliminate fuel line chafing Color coded easy identification Weight 1/2 gram Price 2 $295 No 121 FOURMOST PRODUCTS Size 3/32 lD 4040 24th Avenue Forest Grove OR 97116 503 357-2732 February 1990 59 KJ Put Fun Back Fun Fly Get ROUN TUIT Today Its round S flat flies 30 Flying DISC STOL SUPERIOR Small Field S FUN FLY Aircraft STABLE PREDICTABLE S AGILE VISA Foam ft Lite Ply conairuction ELEVON Mixer Included 25-45 cid d 3-35Ibe Accurate QUALITY Matenala Mild Conat Time HOVERABLE Durable UNUSUAL Will NOT Spin itonded Model Products Box 10996 Suite 543 Austin TX 78766 512 250-1420 5124443368 ONLY Money Back GUARANTEE Business SIMPLY THE BEST may cost little fact is.. cant buy effective easier use soft mount PERIOD UNIVERSAL 2-cycle engines 20 61 EVERYTHING INCLUDED p Available Hobby Dealer order direct add $175 fer abplng MADE IN us manufacturer DISC-LOCK & HUSH FOAM dealer -distrbiIoeshs invited PERFORMANCE PRODUCTS UNLIMITED 7 7093 E Dodge Rd Mt Morris MI 48458 Phone orders 313 631-4894 Visa/MG accep VIBRA-DA BEAMS MP 21 50 VIBRA-DAMP $1095 ALUM TABS GATOR RIC PRODUCTS TIGER TAIL 4S DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offl oalsa kit machined wood parts complete hardwaie package includes plug-in djustable stab parts new wing mounts Wing Span -72 inWing ArHa 860 sq Complete Delux KitSi 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp S 1995 MV-I TYPHOON New F3A competition Big beautiful flyer -balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheetsS 1495 Fiberglass cowlSI B95 Clear butyrate canopy. S 995 OTHER PLANS Tiger Tail 4S-two sheets t 20 four strokes51495 TAB baby 120 four strokesS 1195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sportS 895 Bobcat 40 size sportS 895 GATOR SOFT MOUNTS COMPLErE SOFT MOUNTS INCLUDES ALL HARD WAREI Optimized lowest vibration transmission airframe minimizing engine shake Available YS-60 OS-60$1495 SOFT MOUNT COMPONENTS 4-lug Mounting Plate 606t-T-6 black anodized Undrilled. 559S Drilled VS-itO 05-60. S 695 Rubber Iso-Mounts 518 diameter x t long 8-32 female end 8-32 x 112 male other end Specify soft ISO durometer-yellowl firm 60 durometer-purple Each. S3OOPkg 4S995 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling est Finished Weight Big 3 Sq Yard Pkg Detailed Instructions 5895 Include $2 5Olltem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 325t4 1 476-8639 Best Show Mark Lattimore goal try pass Racing hints much help can need help have some neat trick really works about sharing Send hints and/or ideas will print Ill give credit about Please support NMPRA group re sponsible getting us today information write Ron Schorr 5224 Teesdale N Hollywood CA 91607 See next month RC Helicopters/Jolly Continued train page 55 against clock making naturally fun con test sharpens skills also ring-pickup contest use Helicopters landing skid lift ring rings get smaller effort gets greater also limbo event try place machine under crepe paper limbo bar event sometimes accompanied teresting sounds rotors greet limbo pole No major damage inflictedits part fun also Helicopters work pilot must lift weighted sling load fly cir cuit drop load off another station last two events perennial favorites first being Fun Scale Honestly its fact Scale competition Merced far tougher AMA Nationals fact wouldnt bad idea get fund set up send guy wins Scale Merced following Nats year Pat Brady won Scale Chan nel 3 News Jet Ranger Pat also won last year kind expected him show up Nats Oh well t time Second place Nats Champion Silas Kuok gorgeous scratch-built SA 341 Gazelle third place Walt Ferars super GMP Santini Air Jet Ranger Helicopters class looked super also flew well last event held autorosasions spot held late Sunday afternoon fa vorite spectator event class favorite Robert Gorham can put Helicopter middle spot nine times out 10with 10th being just slightly off center year however Robert challenged Dan Melnik Kalt group Dan actually tied Robert first place since fac tory pilots relinquished prizes thirdplace finisher Walt Ferar GMP Legend Also seen ausorosation Mike Mas proceeded fly Champion tail-first spot auto Oh wonders driven taileh Mike So what new year far products concerned Helicopters Unlimited Century Imports rep resentative Peter Chow first person stopped see Peter has super Larry Jolly Model Products Airwolf display well own little EH-100 electric-powered Helicopter should see little Electric right after first year Ill report further soon available Hobby Dynamics JR Radios representatives Dan Melnik Frank Dykes showed Kalt line Helicopters JR radios Dan gave some spectacular demos Kalts new Excalibur aer obasic machine proving its 91 gear ra tio its bit equal other 60-size rocket ships Gorham Model Products Rebels flying con tinuously including built local hobby shop owner flew free flight over four min utes result either dead batteries switch failure machine hovered around ran out fuel landedan incredible featshowing just stable Rebel Also display GMPs new FAI mechanics done yet getting closer nailing down design Robert Gorham gave spectacular dem os both Saturday Sunday showing us way wish could fly Incredible Rob ert incredible Robbe s representative Mike Mas gave some great demos Champion showing us just good design really thats ahout rest us just great time flying talking Helicopters though lot folks taking Mer ced days theres still room So get out 1990 calendar mark off last weekend September Well see BCNU Make Mold/Pickard Continued page 59 mold lay small pieces cloth us ing crisscross pattern side side top bottom Leave about ing out Wet down entire cloth layer until see black Lay second layer R/C SEMI-KIT stock ORIe iqiines invited SHORT KITS INCLUDE STYF OPOADi WINO CORES CANOPIES COWL5 PLA55 ENOINE MOUNTS FIREWALLS MOLSED i55C PAR5S 5OME HARDWARE AND MATERIALS LIST FOR RALIA Ass ADDITIONAL OFF STE 5RELP ITEMS AGM2 ZERO 54 5PAN3750 PRO SOMAEAWE 55SPAS2750 P 55 AIRACOBRA 55SPAN35 55 9515 MASSANO SR5PAN3750 252 POLOORE 555PAN3750 POCRE WALE 1W SR SPAN 37 55 A26 iNVAOER 65 SPAN 95 P38LIOHONiNG 70 SPAN 7495 PRO CORSAIR 56 SPAN 5 ORDERING SEND CHECK OR MONKS ORDER FOR REQUiRED ARRO5NS PLAS 5450 PER KIT CANADIANS ADD S750I ILLINOiS RESIDENTS ASS AR% SAD WING Mfg 306 E Simmons Galesburg IL 61401 DR 59 0D0tt 94 H6 0 WHEN YOU FORGET\OUR UNITS REMEMBER RC System NICd Batteries Alt chargers need- tn packaget 6V Tx packsPlus $5 S&HGelled Cell Others available write call TrickIer $3496 ForPlus $3 SB-HRegular Model 6 Multiple~eC4For held kit small Plus $3 SB-H Radioselectric boat battenes Specify 612 24V CDHeavy Duty Model $5896 sport winch large boat andPlus $4 SB-H electric power charging batteriesSpecify 6 1 2V CaRa Products SASE br iticimabcePO BOx 221 Oerirtqurnmmnsiied Canton SD 57013 February 1990 161 overlapping cloth pieces until youve covered entire mold twice Make sure resin doesnt pooi bottom Lay mold its side keep turning over couple minutes un til begins kick off Leave epoxy part mold least three days poly ester part should left overnight part light heavy fiber glass its made youre removing very lightweight part mold careful compressor could turn part inside out Youre better off leaving -in cloth overlap around edge extra bulk Heavier parts can blown out relative ease After removing part wash mold water dry thor oughly rewax apply another coat PVA Youre ready mold another part Advice If problems develop have difficulty working out Ill gladly try help please dont telephone Send SASE along description prob lem MH Pickard Fiberglass Master Inc Rt 1 Box 530 Goodview VA 24095 Fiberglass Corporation good source supplies youll need preparing plugs casting molds parts Contact company 1944 Neva Dr Dayton OH 45414 telephone 1-800/821-3283 1513/274-1 159 Ohio good source polyurethane foam contact St Rux Corp 100 E Montauk Hwy Lindenhurst NY 11757 telephone 1-516/9578000 FF Duration/Murphy Continued page 61 However Elfins popularity has recently sky rocketed SAM Society Antique Model ers Class events became apparent probably powerful trouble-free its ignition contemporaries such old Class standbys Arden 199 Ohlsson 19 Bantam 19 etc Having declared legal SAM competi tions British-made Elfin 249 repro-engines have certainly made imprint instance however supplies currently exhausted Argo-USA has recently issued notice due hundreds requests diesel now manufactured right US well-known reliable manufacturer Ap parently laws supply demand still valid certainly good news Should re quire additional information price availability new repro venture just write Argo-USA. 3229 Dianora Dr Palos Verdes Peninsula CA 90274 Tell em Duration told about engine info comes us Phil McCary/Larry Jenno venture modifies minute Cox 020 Pee Wee engine accept ven turi system reminiscent old TD Thermal Hopper modification also includes custommade three-prong radial engine mount Natural ly intent hop-up effort use Pee Wee 30 event first question comes mind results Well mounted business end model designed Charlie Atkinson called Hi-Roller obviously stemming Las Vegas won Phil Larry first second places 1989 US Free Flight Champs last May also entrants max out Phil claims 18000-20000 rpm 40%-nitro fuel using standard 45 x 2 Cox gray plastic prop cut down 425 x 2 prop blades also thinned some balanced Phil Larry like start early thinwalled-cylinder 020s claiming have better piston/cylinder fits what currently being produced reed body machined off tank intake tube cut down collar made fit over intake tube threaded ac cept Cox TD 020 venturi needle valve sembly gas tank machined off meth ods mounting engine thereby elimi nated new three-pronged adapter mount machined hard aluminum fulfill re quirement Thats What see what get Technically appears start good engine put TD 020 needle valve sembly itbut sure looks nice too Hi-Roller sports 8% airfoil wing 6% stab Both wing stab undercambered Should wish additional infor mation engines model both send SASE Phil McCary Jr 532 College Dr 2l2 Henderson NV 89015 Personally think ventures such healthy model competition though takes place so-called beginners event Im too sure Pee Wee 30 constitutes beginners event anyway since seems competi tors area contest circles participate have flying Free Flight years Maybe should listed under heading fun event instead FF event fun particular event liking dividual However FFers like same events reason have eventsand put tachometer stock Cox Pee Wee 020 fall belonged Bill Hale Basic Yeller fame see Duration column August 1988 sounded great clocked 19000 rpm asked him hopped up said did take out bubble pack came run Granted differences tachometers atmospheric conditions point apparently stock en gines around can hold own hopped-up versions rate Pee Wee 30 event continues roll along competition will naturally get stifferand what can detrimental rest case Gary Buddenbohm sent sample kits Silly Putty DT Systems brother Stan pro duce kits result trying nearly 50 prototype systems before achieving current de sign As mute testimony questions regard ing merits final system Stan won Hand-Launched Glider event 89 AMA Nats using SDT system Gliders took kits CIA Central Indiana Aeromodel ers club meeting recently generated considerable interest Although Ive mentioned gadget col umn before Ill repeat tab $5 either HLG Small Rubber kit cludes appropriate instructions Want mailing address SDT Systems 5652 Mainhardt Rd Westminster CA 92683 Take fire haz ard out flying try Preventive maintenance department beauty neatly covered fuselage framework Continued page 166 162 Model Aviation Name Street Address City 7in
Edition: Model Aviation - 1990/02
Page Numbers: 56, 57, 58, 59, 161, 162
Making own Parts fiberglass plugs Fiberglass molds d can save some bucks giving a great sense satisfaction job well done its something youve always wanted door youre just curious about its doneread EMH Pickard FOR THE MODELER wants rise challenge just save few bucks story mold fiberglass part Though takes lot work some careful planning right its definitely economical goes well youll save little under two-thirds cost having average part professionally made procedure outlined making mold can used produce part Though production mold will give three four parts youre careful Begin accurate drawing drawing must represent exactly what needed unless carving mod el Two-piece parts such cheek cowls wheel pants must planned ginning Also configuration de sired part such one-piece mold wont work two-piece plug will neces sary can made up two pieces A-in plywood cut shape cen terline part fitted waxed dowels alignment separation plug material can glued ply bases carved shape Plug materials may hardwood balsa foam anything else can take hard finish Finishing surface plug critical slightest imperfection will reflected moldand finished part Take time carefully choosing plug material keep following considerations mind Hard wood easiest finish takes time patience carve Balsa other hand easier carve difficult finish since finish has wood rather its surface later Finally foam available two ba sic types Polyester foam found blue white green white coffee cups packing etc very soft touch very difficult sand blue dock flota tion etc too porous purposes preferred polyester green type used florists hold flowers etc quite dense soft easy shape sand Polyurethane foam available white brown used insulation buildings flotation boats etc comes various weights 2 24 lb per cu ft lower number softer foam Six pounds seems ideal density mak ing plug since its easy sand shape finish Finishing materials pine poplar plug may finished hard material Dope lacquer epoxy polyester work quite well Balsa may finished same ma terials first coat must thinned 50% allowed soak wood Af ter first application has hardened plug has sanded three unthinned coats should applied Polyurethane foam plugs may finished epoxy polyester Use epoxy however polyester foam anything else will melt down Dope lacquer can thinned lac quer thinner acetone Epoxies come two formsthick gluing parts thin layup work Both types can thinned alcohol Work small batches Afterthe catalyst thoroughly mixed sealable jar alco hol wood methanol can added little time until epoxy will flow soak easily Thinned epoxy takes longer cure alcohol requires time evapo rate mixed too much seal con tainer store surplus freezer Itll keep about week Brushes can cleaned alcohol soap water 56 Model Aviation base block establishes outline cowl centerline maxwidth cross line have scribed block has bonded foam block un der two T-nuts have installed plug base first coat black res Three coats resin required sanded smooth before applying next finished foam block representing Tay lorcraft cowl Recessing cutouts about s stronger structure Two cowls set wheel pants being readied molding paste waxes Butchers Tree wax Johnsons wax used white Masonite working base boards Dont use wax plug Don t use five-minute epoxy kind work Polyester resin comes four types 1 Gel coat resin usually colors first coat applied layup work 2 Laminating resin general-purpose layup resin no wax stays tacky cured about week cannot sanded 3 Finishing resin general-purpose resin wax used finishing since easily sanded resin must sanded between coats 4 Tooling resin used making molds four resins can thinned styrene acetone after mixing cat alyst Brushes may cleaned acetone Dont try save polyester after mix ing wontkeep Finishing plug intend add panel lines plug before fin ish applied Press cut lines plug remain visible ap ply resin Bolt plug down piece 34-in ply something similar placing slick smooth piece Masonite Formica tween plug mounting board Coat piece paste wax prevent plug sticking youre using epoxy finish however wax wont work thin piece vinyl will serve same purpose Have tub black dye available good paint store handy mix res wood plug dye covers grain foam turns material black bet ter visibility begin sanding fin ish Unsanded areas will show up shiny Mix first batch resin add little black dye thin 50% Apply mix ture plug Allow first application soak thoroughly Set plug aside cure cleaning brushes next coat applied unthinned February 1990 57 Wheel pant molds PJ 295 left mold has removed plug right still place Normally its best make plug black resin contrasts molding material making easier spot imperfections thin spots during molding 1 nis tne right half split cowl mold laid up its Masonite base backing sheet attached using three coats resin Shown center half split plug ply backplate showing max-width cross line 10-32 T-nuts dowels used attaching aligning two halves plug U two plug halves put together split plug will make cowling big Lazy Ace temporary backing plate T-nut screwing onto plug back its possi ble clamp plug vise angle Lazy Ace cowl split plug being shaped scraped sanded finishing cowl now clamped upright ta ble finishing air inlets small vise used sharpening scraping blade youre using polyester finishing resin ap ply second coat within 30 minutes first-coat application first coat has gelled gone dull wait too long youll have sand between coats Ideally either polyester epoxy three coats should applied before sand ing becomes necessary Dont allow resin run drip merely creates sand off later After third coat resin has ap plied start sanding scraping Sandpa per removes conspicuous roughness scrapers fine work Glass shards make great scrapers course must handled caution piece stainless steel about 050-in thick 450 edge filed side another good possibility several pieces can shaped fit con tours required Keep tool edges sharp file grinder hones steel edges glass cutter handy renewing edges glass Dont worry accidentally sand through resin spots sanding complete fill bare spots resin thickened little sanding dust Once damaged area filled cured sand smooth apply another coat resin entire plug youve sanded en tire plug absolutely smooth break ing through finish youre ready ap ply final coat resin Thin finish coat cover sanding marks thoroughly cured lightly sand first 150-grit paper blunt roughness remove dust particles wet sand Begin 320-wet work up 500-wet glass-smooth finish satisfied allow dry thoroughly before painting Use gloss-white lacquer color contrasts color mold can see what youre doing during layup Paint black youre going sent molding make white molds Making mold basic materials clude can butchers wax container polyvinyl alchohol PVA good sup ply fiberglass cloth mat PVA li quefied vinyl impervious resins can brushed sprayed removed warm water Open can PVA check its color before buying should red green product brown reject indicates contamination Transfer PVA can sealable glass bot tle immediately after purchase since trace rust will contaminate point plug should painted polished sitting its bare board Ap ply least three coats wax wiping off excess paper towel letting coat dry about 15 minutes before buf fing sure wax extends bottom base board Allow final coat stand several hours overnight before buffing out plug will have electromagnetic charge attracts dust Gently wiping down plug rag lightly sprayed little Fantasy similar brand spray cleaner will remove dust neutralize charge careful overdo spray cleaner itll also remove wax Brush spray PVA coat thats necessary Dont polish wipe plug Also despite what may have read attempting apply wax over PVA doesnt work know firsthand expe rience gel coat can now applied youre using epoxy mix up enough cover plug Add black dye ep oxy too thin tends run some tal cum powder Coat entire plug white fully covered extending coat about around base Once has begun harden mix epoxy begin applying glass mat Mat comes two weights 34 oz 1 /2 oz 34 -oz density works best Cut strip about 8 wide Roll up tightly twisting vigorously hands soften unroll strip cut 4-in-wide pieces Starting corners tear 4-in pieces half Dou ble overlap pieces lay up Lightweight fiberglass cloth will work just well glass cloth sold weight per square yard varies thickness material Lightweight cloth 2 4 oz Dont use fiberglass cur tains theyre treated purposes Start 1-in strip around base about out plug area must thick enough keep mold warping once its free Apply overlapping layers cloth top extending down over base Build up least two layers lay up another 1-in strip around base Set aside cure 24 hours Sand overlaps apply another coat res set aside three five days age 58 Model Aviation Some tools making plug far left hacksaw blade set wood block used making panel lines various files scrapers sanding blocks foam file Top Flite P-Si piug being readiedThe same P51 plug after both sides have painting black lacquer dry ItHere P-Si plug fence around itbeen laid up After its cured its split apart will polished waxed preparation forfor creating two-piece mold Its ready athe edges trimmed its ready beginning process laying up moldcoat PVA begin laying up moldprepare molding process begin around 700 Epoxy takes seven days 770 properly age thus minimizing risk mold warpage After aging period remove plug its base trim edge band saw sander leaving edge approxi mately /2 mold Especially one-piece mold air compressor almost necessity remov ing plug mold device will also help remove parts mold after youve made dont have com pressor rent buy borrow re move two-piece mold spread outer edges slightly work small knife enough create air passage blow some air plug should pop right out same other half youre ready wash PVA out warm water one-piece mold little diffi cult air compressor really comes its own After trimming edge mold begin lightly tapping entire mold rubber hammer sep arates mold plug just enough al low air introduced Drill hole top air inlet use compressor remove plug hole will used again later remove part mold directing air pressure through hole fails remove plug theres alterna tive method should work Blow air around bottom edge base stall long screw base grip screw vice gently work mold loose upward pressure edge Once free wash out PVA warm water polyester mold made basically same manner epoxy finish ing resin however contains wax Remove wax gently wiping down hard ened surface rag lightly soaked ac etone Let gel coat set about 30 minutes Check make sure doesnt come off touch apply cloth resin two layers its hard enough sand blend oYerlaps smooth final coat consists resin Allow set 24 hours long enough age polyester Separate plug mold using same methods outlined above Wash out PVA mold now com pleted yciure ready make some parts Laying up part Look mold over carefully inside edge little ragged smooth out wet sanding polish auto rubbing compound Give entire mold light polishing wax thoroughly least three times butchers wax just did plug Let set couple hours polish final time apply coat PVA Cover drilled air hole small piece tape make sure stays clear technique laying up part es sentially same whether using epoxy polyester curing times differ Mix up batch resin wet down inside Continued page 161 Bulkhead Fittings Fourmost Bulkhead Fitting s simple method feed fuel vent lines through solid bulkheads 1 Drill hole No 18 drill size bulkhead firewall up 3/8 thick 2 Insert shaft Bulkhead Fitting through hole 3 Screw nut onto backside fitting 4 Slip fuel vent tubes lob done Bulkhead Fittings provide sealed tank compartment eliminate fuel line chafing Color coded easy identification Weight 1/2 gram Price 2 $295 No 121 FOURMOST PRODUCTS Size 3/32 lD 4040 24th Avenue Forest Grove OR 97116 503 357-2732 February 1990 59 KJ Put Fun Back Fun Fly Get ROUN TUIT Today Its round S flat flies 30 Flying DISC STOL SUPERIOR Small Field S FUN FLY Aircraft STABLE PREDICTABLE S AGILE VISA Foam ft Lite Ply conairuction ELEVON Mixer Included 25-45 cid d 3-35Ibe Accurate QUALITY Matenala Mild Conat Time HOVERABLE Durable UNUSUAL Will NOT Spin itonded Model Products Box 10996 Suite 543 Austin TX 78766 512 250-1420 5124443368 ONLY Money Back GUARANTEE Business SIMPLY THE BEST may cost little fact is.. cant buy effective easier use soft mount PERIOD UNIVERSAL 2-cycle engines 20 61 EVERYTHING INCLUDED p Available Hobby Dealer order direct add $175 fer abplng MADE IN us manufacturer DISC-LOCK & HUSH FOAM dealer -distrbiIoeshs invited PERFORMANCE PRODUCTS UNLIMITED 7 7093 E Dodge Rd Mt Morris MI 48458 Phone orders 313 631-4894 Visa/MG accep VIBRA-DA BEAMS MP 21 50 VIBRA-DAMP $1095 ALUM TABS GATOR RIC PRODUCTS TIGER TAIL 4S DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offl oalsa kit machined wood parts complete hardwaie package includes plug-in djustable stab parts new wing mounts Wing Span -72 inWing ArHa 860 sq Complete Delux KitSi 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp S 1995 MV-I TYPHOON New F3A competition Big beautiful flyer -balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheetsS 1495 Fiberglass cowlSI B95 Clear butyrate canopy. S 995 OTHER PLANS Tiger Tail 4S-two sheets t 20 four strokes51495 TAB baby 120 four strokesS 1195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sportS 895 Bobcat 40 size sportS 895 GATOR SOFT MOUNTS COMPLErE SOFT MOUNTS INCLUDES ALL HARD WAREI Optimized lowest vibration transmission airframe minimizing engine shake Available YS-60 OS-60$1495 SOFT MOUNT COMPONENTS 4-lug Mounting Plate 606t-T-6 black anodized Undrilled. 559S Drilled VS-itO 05-60. S 695 Rubber Iso-Mounts 518 diameter x t long 8-32 female end 8-32 x 112 male other end Specify soft ISO durometer-yellowl firm 60 durometer-purple Each. S3OOPkg 4S995 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling est Finished Weight Big 3 Sq Yard Pkg Detailed Instructions 5895 Include $2 5Olltem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 325t4 1 476-8639 Best Show Mark Lattimore goal try pass Racing hints much help can need help have some neat trick really works about sharing Send hints and/or ideas will print Ill give credit about Please support NMPRA group re sponsible getting us today information write Ron Schorr 5224 Teesdale N Hollywood CA 91607 See next month RC Helicopters/Jolly Continued train page 55 against clock making naturally fun con test sharpens skills also ring-pickup contest use Helicopters landing skid lift ring rings get smaller effort gets greater also limbo event try place machine under crepe paper limbo bar event sometimes accompanied teresting sounds rotors greet limbo pole No major damage inflictedits part fun also Helicopters work pilot must lift weighted sling load fly cir cuit drop load off another station last two events perennial favorites first being Fun Scale Honestly its fact Scale competition Merced far tougher AMA Nationals fact wouldnt bad idea get fund set up send guy wins Scale Merced following Nats year Pat Brady won Scale Chan nel 3 News Jet Ranger Pat also won last year kind expected him show up Nats Oh well t time Second place Nats Champion Silas Kuok gorgeous scratch-built SA 341 Gazelle third place Walt Ferars super GMP Santini Air Jet Ranger Helicopters class looked super also flew well last event held autorosasions spot held late Sunday afternoon fa vorite spectator event class favorite Robert Gorham can put Helicopter middle spot nine times out 10with 10th being just slightly off center year however Robert challenged Dan Melnik Kalt group Dan actually tied Robert first place since fac tory pilots relinquished prizes thirdplace finisher Walt Ferar GMP Legend Also seen ausorosation Mike Mas proceeded fly Champion tail-first spot auto Oh wonders driven taileh Mike So what new year far products concerned Helicopters Unlimited Century Imports rep resentative Peter Chow first person stopped see Peter has super Larry Jolly Model Products Airwolf display well own little EH-100 electric-powered Helicopter should see little Electric right after first year Ill report further soon available Hobby Dynamics JR Radios representatives Dan Melnik Frank Dykes showed Kalt line Helicopters JR radios Dan gave some spectacular demos Kalts new Excalibur aer obasic machine proving its 91 gear ra tio its bit equal other 60-size rocket ships Gorham Model Products Rebels flying con tinuously including built local hobby shop owner flew free flight over four min utes result either dead batteries switch failure machine hovered around ran out fuel landedan incredible featshowing just stable Rebel Also display GMPs new FAI mechanics done yet getting closer nailing down design Robert Gorham gave spectacular dem os both Saturday Sunday showing us way wish could fly Incredible Rob ert incredible Robbe s representative Mike Mas gave some great demos Champion showing us just good design really thats ahout rest us just great time flying talking Helicopters though lot folks taking Mer ced days theres still room So get out 1990 calendar mark off last weekend September Well see BCNU Make Mold/Pickard Continued page 59 mold lay small pieces cloth us ing crisscross pattern side side top bottom Leave about ing out Wet down entire cloth layer until see black Lay second layer R/C SEMI-KIT stock ORIe iqiines invited SHORT KITS INCLUDE STYF OPOADi WINO CORES CANOPIES COWL5 PLA55 ENOINE MOUNTS FIREWALLS MOLSED i55C PAR5S 5OME HARDWARE AND MATERIALS LIST FOR RALIA Ass ADDITIONAL OFF STE 5RELP ITEMS AGM2 ZERO 54 5PAN3750 PRO SOMAEAWE 55SPAS2750 P 55 AIRACOBRA 55SPAN35 55 9515 MASSANO SR5PAN3750 252 POLOORE 555PAN3750 POCRE WALE 1W SR SPAN 37 55 A26 iNVAOER 65 SPAN 95 P38LIOHONiNG 70 SPAN 7495 PRO CORSAIR 56 SPAN 5 ORDERING SEND CHECK OR MONKS ORDER FOR REQUiRED ARRO5NS PLAS 5450 PER KIT CANADIANS ADD S750I ILLINOiS RESIDENTS ASS AR% SAD WING Mfg 306 E Simmons Galesburg IL 61401 DR 59 0D0tt 94 H6 0 WHEN YOU FORGET\OUR UNITS REMEMBER RC System NICd Batteries Alt chargers need- tn packaget 6V Tx packsPlus $5 S&HGelled Cell Others available write call TrickIer $3496 ForPlus $3 SB-HRegular Model 6 Multiple~eC4For held kit small Plus $3 SB-H Radioselectric boat battenes Specify 612 24V CDHeavy Duty Model $5896 sport winch large boat andPlus $4 SB-H electric power charging batteriesSpecify 6 1 2V CaRa Products SASE br iticimabcePO BOx 221 Oerirtqurnmmnsiied Canton SD 57013 February 1990 161 overlapping cloth pieces until youve covered entire mold twice Make sure resin doesnt pooi bottom Lay mold its side keep turning over couple minutes un til begins kick off Leave epoxy part mold least three days poly ester part should left overnight part light heavy fiber glass its made youre removing very lightweight part mold careful compressor could turn part inside out Youre better off leaving -in cloth overlap around edge extra bulk Heavier parts can blown out relative ease After removing part wash mold water dry thor oughly rewax apply another coat PVA Youre ready mold another part Advice If problems develop have difficulty working out Ill gladly try help please dont telephone Send SASE along description prob lem MH Pickard Fiberglass Master Inc Rt 1 Box 530 Goodview VA 24095 Fiberglass Corporation good source supplies youll need preparing plugs casting molds parts Contact company 1944 Neva Dr Dayton OH 45414 telephone 1-800/821-3283 1513/274-1 159 Ohio good source polyurethane foam contact St Rux Corp 100 E Montauk Hwy Lindenhurst NY 11757 telephone 1-516/9578000 FF Duration/Murphy Continued page 61 However Elfins popularity has recently sky rocketed SAM Society Antique Model ers Class events became apparent probably powerful trouble-free its ignition contemporaries such old Class standbys Arden 199 Ohlsson 19 Bantam 19 etc Having declared legal SAM competi tions British-made Elfin 249 repro-engines have certainly made imprint instance however supplies currently exhausted Argo-USA has recently issued notice due hundreds requests diesel now manufactured right US well-known reliable manufacturer Ap parently laws supply demand still valid certainly good news Should re quire additional information price availability new repro venture just write Argo-USA. 3229 Dianora Dr Palos Verdes Peninsula CA 90274 Tell em Duration told about engine info comes us Phil McCary/Larry Jenno venture modifies minute Cox 020 Pee Wee engine accept ven turi system reminiscent old TD Thermal Hopper modification also includes custommade three-prong radial engine mount Natural ly intent hop-up effort use Pee Wee 30 event first question comes mind results Well mounted business end model designed Charlie Atkinson called Hi-Roller obviously stemming Las Vegas won Phil Larry first second places 1989 US Free Flight Champs last May also entrants max out Phil claims 18000-20000 rpm 40%-nitro fuel using standard 45 x 2 Cox gray plastic prop cut down 425 x 2 prop blades also thinned some balanced Phil Larry like start early thinwalled-cylinder 020s claiming have better piston/cylinder fits what currently being produced reed body machined off tank intake tube cut down collar made fit over intake tube threaded ac cept Cox TD 020 venturi needle valve sembly gas tank machined off meth ods mounting engine thereby elimi nated new three-pronged adapter mount machined hard aluminum fulfill re quirement Thats What see what get Technically appears start good engine put TD 020 needle valve sembly itbut sure looks nice too Hi-Roller sports 8% airfoil wing 6% stab Both wing stab undercambered Should wish additional infor mation engines model both send SASE Phil McCary Jr 532 College Dr 2l2 Henderson NV 89015 Personally think ventures such healthy model competition though takes place so-called beginners event Im too sure Pee Wee 30 constitutes beginners event anyway since seems competi tors area contest circles participate have flying Free Flight years Maybe should listed under heading fun event instead FF event fun particular event liking dividual However FFers like same events reason have eventsand put tachometer stock Cox Pee Wee 020 fall belonged Bill Hale Basic Yeller fame see Duration column August 1988 sounded great clocked 19000 rpm asked him hopped up said did take out bubble pack came run Granted differences tachometers atmospheric conditions point apparently stock en gines around can hold own hopped-up versions rate Pee Wee 30 event continues roll along competition will naturally get stifferand what can detrimental rest case Gary Buddenbohm sent sample kits Silly Putty DT Systems brother Stan pro duce kits result trying nearly 50 prototype systems before achieving current de sign As mute testimony questions regard ing merits final system Stan won Hand-Launched Glider event 89 AMA Nats using SDT system Gliders took kits CIA Central Indiana Aeromodel ers club meeting recently generated considerable interest Although Ive mentioned gadget col umn before Ill repeat tab $5 either HLG Small Rubber kit cludes appropriate instructions Want mailing address SDT Systems 5652 Mainhardt Rd Westminster CA 92683 Take fire haz ard out flying try Preventive maintenance department beauty neatly covered fuselage framework Continued page 166 162 Model Aviation Name Street Address City 7in