Scale Bob Dolly Wischer CONTROL CABLES Control surface actuation cable commonly used Scale models aircraft have exposed cables Its notable advantage its light weight short lengths use models no stretch fore no loss motion using stain less steel cable intended operation Control Line models cable inex pensive found hobby shops flexible available various diameters suit model sizes Its main dis advantage cannot soldered Terminations must made swaging Other materials have also used such fish-line leaders plastics experience has slight amount stretch objectionable because motion lost loss varies airspeed have seen control cables fastened directly servo output arms basic fault arrangement im poses constant load servo bear ings lever length too short provide positive control neutralizing preference plywood lever pivoted its center cables fastened end short music wire pushrod connects lever servo output arm disc Lever length can long per mitted fuselage width widebodied models Emeraude example lever eight-in long really important factor cable system lever length distance between cable end pushrod attachment point lever control horn rudder eleva tor can scale length crosssectional size best appearance horn must very secure fastening rudder certain no lost motion also withstand considerable force line tension Once geometry control cable system understood advantages become apparent example control surface travel can altered shifting point lever music wire pushrod pivoted Ordinarily attach pushrod close possible cable attachment points using servo arm length provide desired control surface travel However lever made longer end pushrod pivot 46 Model Aviation Bill Kleinhans brought 93in.span Flesler Starch 85 Mint Julep contest Its Swensen kit uses silk doDe covering Supertigre 75 engIne Mike Wartmans Christen Eagle started Pilot kit Power 05 90 four-StrOke paint scheme entirely masked using acrylic lacquer over World-Tax fabric i-o~er u-vii scratch-built creation Ralph Jackson Power Webra Bully engine Span 80 weight 2075 lb used polyester covering material finished acrylic-lacquermasked frisket Including lozenge-pattern upper surfaces extreme tip long end will reduction control surface travel relative servo motion reverse also true lever having equal lengths side center servo linkage pushrod some point closer lever center controlsurface travel increased relative servo motion leverage advantages can handy whenever servos mounted odd positions often happens Scale models servos spaced close proximity long servo output arm cannot fitted interference levers airplanes made 1/8-in ply center hole drilled close running fit No 5 wood screw screw threaded anchoring block Cnntinupd ~gp Gary Underhills 82-ln-span Curtiss Condor L uses two HP 21 four-stroke engines weIghs 975 lb Sonic Systems air cylinders operate homemade retracts Tartan single powers Fokker EV R built Bob Hanft WW I-era /4scaler has machine gun sound effects during flight Covering material dacron organza CoveritelK&B epoxy Weighs 1875 lb spans 84 7 / Model Magic Epoxy Plus 8 mm 25% lighter Sands & carves like Basswood \ Non sagging gap filling super strength Use anywhere two part epoxy used B fi oz $895 retail equal 8 oz regular epoxy Model Magic Filler Balsa Foam & Fiberglasssands exactly like Balsa Super lightweight Superior adhesion Waterproof Nontoxic Use nicks gaps fillets fairings building up large areas8 fI oz $595 retail shrink turn brittle used gasoline fuel offers clarity visual fuel flow Model Magic - fuel tubing remains flexible plasticizer migration foul engines exhibits outstanding tear abrasion resistence Tubing tinted red easy identification gasoline & diesel use Available 5ff $249/pkg 1 Off $479Ipkg 50ff spools $21 90 Blue Gb-Fuel Tubing Made finest silicone tubing available Less 1% swelling after 150 hours % nitro fuel Available 2 5ff packages 50ff spools i C Inc ThModel Gas & Diesel Tubing Magic Gas & Diesel Fuel Tubing will swell fine products available dealer direct Magic Products PO Box 19784 St Paul MN 55119 715/425-1397 December 1985 47 rare 193Osera Rose Parakeet /3scale oy rat massey nas uperpoxy tinisfl over Koverall used two coats nontautening dope two coats regular butyrate Building repairs asnapwith Model Magic U ma u m N m m FOUR CYCLE ENGINE MOUNTS Cast oluminurn alloy Ground 90 thrust line Brigtrt polish finished Socket cap screws inCluded DRILLED AND TAPPED FOR No Jt-20 OS MAX PS 20600 No JT-4o Undnhled tar 21-40BOO No Jt-41 HPVT21 1000 No JT-42 ENVA 35-40 AC 1000 No JT-43 SAITO PA 30 tOOC NoJT-44 OSMAXPS4O 1000 No JT-45 SAITO PA 40-45 1000 No JT-46 ENA 46 AC 000 Na JT-49 HP VT 49 1200 No JT-60 Undnlled 501 60-901100 No JT-61 OS MAX FS 61 t3O0 No JT-62 Os MAX PS 6075-90t3D0 No JT-64 ESWYA 60-80-90-120 AC 1300 No JT-65 SAITO PA 65 1300 No JT-t20 Und6lled tor 120 t600 No JT-121 ENVA P 120 PC 1800 Na JE-t22 Os MAX PS 120 1800 Na JT -123 SAITO PA t20 800 No JT-125 Super hgre 25-3000 tB00 RC Soaring/Pruss Continued page 133 Pivot areas name impliesa pivoting wing wingerons coupled rudder plus elevator fuselage seamless fiberglass shell wood deck Its 36 inches long wing foam core spruce spars A2-in balsa sheeting Airfoil Eppler 387 Wingspan 60 inches design exceptionally clean no rubberbands screws exposed Micro servos 100-mA battery pack job internally room 225-mA battery pack bird towards sophisticated side kitting packaging quality throughout kit contains hardware pushrods necessary including pivoting wings Cost $6995 available direct-only Dodgson Designs 2904 SW Camano Dr Camano Island WA 98292 thought hand-launch birds boxy-looking very simple design no imagination toward aesthetics Pivot should dispel idea Jim Porter Iowa will help sup port Jim Porters two models Whisper II first has seen Midwest circlesand thermalsfor about last three years open framework fuselage makes design distinctive Controls ailerons elevator Wingspan 55 inches around Eppler 214 airfoil Allup weight 15 ounces can see construction built-up One-eighth-inch spruce longerons shape fuselage A-inch square balsa provides cross bracing contrast Whisper number II has all-sheeted pivoting wing Elevator other control As Whisper both servos mounted fuselage aedilable hobby shop ORDER DIRECT return UPS shIpment Joirir rororie ENGINE TESTING STANDS Steel restraining pins Cast Aluminum tar engine52k JT-Q3A QUADRA 35 Jt-Z34 ZENOAN G-3B IT-TD4 ALTEC ERD 2000 No OrSI JT152JI-QaB QUADRA 25 10 60Garrl sizeA 10 2 5JT-Q5B QUADRA 50 11 50 00JT-Z3B ZENOASI G-3B JT-M38 MAXI 30 2000 SIDE MOUNT MUFFLERS tar PUTS CAP 21 CESSNA 150 etc No JT-40 29-404h 60 1500 4591 12 EXHAUST EXTENSIONS NEOPS5NE JtMI2016 400JINSA , biA 350 JI M55 % 016455J5N38 50 JtNi2 75 78016 600JINOS 00 JtN3A 6 BrA550 GIANT ENGINE MUFFLERS Marched engine tail pipe extensions mounting bolts included Also available tar ATLAS 46 BULLY COBRA KAWASAKI KIORITZ SACH-DOMLER SUPER TIGRE 2500-3000 jt-Q3L QUADRA 35 Jt-Q5L QUADRA 50 Jt-Z3L ZENOAH G-3B JT-TDR ALTEC ERD JT-M3R MAXI 30 JT-Q3R QUADRA 35 JT-QSR QUADRA 50 JT-Z3R ZENOAH G-38 JT-M3L MAXI 30 JT-Q54 QUADRA 50 JT-M34 MAXI 30 2000 JT-Q SS QUADRA 50 JT-M35 MAXI 30 2000 MAIL ORDER Ptease add 250 tar UPS shipping Check MO VISA MC COD accepted Add 200 estra tar COD Calit residenTs add 6% tax -SEND FOR FREE CATALOGAirfoil again Eppler 214 span 61 inches unwritten weight-limit also bumped number II pushes 1TA ounces Well have fans Some thoughts ideas photos thinking small Its fact hand-launch unofficial category novel idea just whim local group fliers Its growing steadily since least 1977 andjudging letters club newslettersthere terest nationwide So maybe its time think-small category think-big con test unofficial event 1986 AMA Nationals event could run day after regular Soaring schedule Pre-registra tion could take place during regular events get idea would compete event could run competing unlike large club con test way regular task force workers wouldnt loaded down extra chores Tasks task could simple Let weather dictate Simple man-on-man five-minute max would help keep things flowing no winches concerned about group could ready box launch area ready fly soon previous groups transmitters clean Since would unofficial event entry fee could too no trophies available let small entry fee say buck two divided up prize money really could minimumhassle/maximum-fun event Think about pass thoughts way Well pass Good lift Dan Pruss 131 E Pennington Ln Plainfield IL 60544 responding advertisers mention read about ModelAviation RC Scale/Wischers Continued page 47 basswood pine lever will pivot freely block needs cemented securely fuselage centerline braced withstand tension cables time concerned about wear center hole also drilled holes cable attachment used short lengths brass tube bush ings plywood later airplanes bushings have omitted no detrimental effects plywood isnt worn away flight operations after years use rudder horn l/8-in-thick plywood average models would too heavy correct scale appearance Thinner plywood should have brass bushings epoxied place long life tube needs slightly longer horn thickness common Control Line sevenstrand wire size purposes 018 diameter 1/2-in length 062-in outside diameter aluminum tube flat tened slightly squeezing gently between wide jaws electricians pliers Unless flattened tube will accom modate two wires 018 diameter Thread length tube wire sert wire back through tube Slide tube toward lever shorten loop crimp tube tightly squeezing pliers larger airplanes have using 021 diameter wire two will fit within aluminum tube though has made oval squeez ing Rather use larger-size tube ream out 062-in tube No 63 037 No 62 038 diameter drill before changing its shape oval no need large gaping holes fuselage sides wires emerge After model completed painted 1 36 Model Aviation 2000 determine exact hole locations measurement drill use length %2-in music wire about two feet long ground sharp chisel point rotated electric hand drill hole started piercing fuselage side scriber music wire drill tip will wander mar finish Bits masking tape stuck fuselage side act aiming point combination rudder horn wire attachment holes direct music wire drill proper path drill aimed comes out very close end lever inside fuselage should happen bulkhead path drill its plywood drill will penetrate continue straight path course could have done previously during fuselage con struction rudder already hinged minor problem finding drilled hole covered finished fuselage afterward intent have no bends wire rudder horn lever no friction points along way spoil freely-operating system usual assembly sequence thread lengths wire through holes fasten crimp lever end loosely loop wires through rudder horn tubes Gradually tighten wire sliding through horn tube until rudder held its neutral position lever other end held right angles fuselage longitudinal axis done servo mounted place receiver transmitter turned maintain lever its true neutral position Use pliers pull wire ends placing equal tension wires sliding tube shorten loop before final crimping tubes connection extremely positive Concerned about effect steel wires close parallel receiver antenna Scale models since 1970 have antenna inside fuselage along wires has never range problem because using Kraft Royal Ace radios doubt check both ways antenna inside outside fuselage have found no difference Fiberglass cowls letter Jack Schwartz included some suggestions improvements method produc ing fiberglass cowls over foam cores described July 1985 column As last layer place fiberglass cloth Jack uses portion panty hose stretched over cowl form mounted end broomstick clamped vise panty hose pushed pulled stretched ends tied underneath After minute com plete stretch smooth resin ex trudes through panty hose weave us ing stick brush fingers what ever handy about 15 minutes dab off excess epoxy working front back cowl finished product surface requires no sanding Jack also has other methods using panty hose An entire fuselage can covered piece rear either fiberglass balsa sheeting over openwork structure open structure first uses three light coats nitrate dope fill pores cover ing After 48-hour cure time applies heat iron medium heat setting panty hose material pulls up tight drum large fuselages covering wings suggests buying queen-size jumbo-size panty hose definitions Jack says its tough called Panty Hose Kid age 71 Jack has fourdigit AMA number Four-stroke glow plugs Approximately 25 years ago appeared hobby market glow plug made makers Champion spark plugs labeled VG-2 same ad standard glow plug appearance closely resembled regular porcelaininsulated spark plug miniature familiar red lettering imprinted used until first glo bar plugs came along put aside better idling afforded newer glow plugs Someone suggested old Cham pion glow plugs well suited operation four-stroke engine searched through pile discarded engine parts found pair Champion plugs new condition Opera tion better expected extra 200 rpm top end extremely slow idle excellent transition OS Gemini twin 120 Champion plugs look exactly like spark plugs have asked countless occasions wheth er Gemini ignition standpoint Scale appearance great improvement over model Slow plugs small problem wrench fit plug body wont fit inside Gemini cooling fins its cylinder heads turned down standard six-ppint hex socket thinner walls provide clearance fins Find someone has modeling 25 years Beg bor row steal cast-off Champion glow plugs try four-stroke provided course isnt four-stroke engines reputation unlimited life Cabin interiors reader requests infor mation about cabin interior detail done beginning fuselage con struction after completion model answer little large doors hatches removable canopy permit easy access interior much detail can applied finished airplane openings small work needs done early fuselage construction fuselage having visible steel tubes Continued page 141 ggggg eSOOeOO OOOOOggOOOOO 0 & m aa hi S no vg o E3 80 El0 S 0 0 S 6 0 408 S -0~0-0000 00 0 no 0o 80 8- __ _ 00000 0OU C05 C88Z8n0 O~C9o00 S IUJEiII 0 0 SS 0 0 0 100000000000006600 5080~~80 O5.non5~ n F 0008g S a- F 5 E5S F V05 000000005 F 800 S z December 1985 137 00 F 58 -C8) RC Scale/Wischers Continued page 137 formed aluminum bulkheads parts built structure before ex ternal sheeting applied Tubes can represented wood dowels fastened ordinary model cement glue Aluminum tubes can also employed present problem fastening joints unless modeler adept brazing joints either wood aluminum must absolutely secure will loose parts rattling around side fuselage after first bad land ing best paint parts before covering fuselage exterior surfaces Civil aircraft types likely have smoothly-finished interior military planes will show open structure smooth interior balsa styrene sheets can built desired ef fect Keeping mind difficulty working through small openings fin ishing interior best apply paint work progresses rather try paint inside afterward nearly impossible spray inside cabin completed fuselage military types inner sur face covering material becomes cockpit wall canopy can made removable access cockpit Working through small cabin door worst possible situation Consider building access hatch fuselage bottom less conspicuous top hatch visible edges smooth surfaces should exist least desirable airplanes radio equipment has installed cockpit area compound problem making pre sentable interior Seats floors must somehow made removable servicing installation servos battery receiver recent models us ing Velcro hold seats floors example seat held four small scraps about / x 1 in size Velcro area too large balsa seat struc ture will come unglued abuse removal use smaller pieces light pull will extract seat yet held tight withstand accidental motion bad landing has never shaken loose seat planes dummy pilot can held place means seat belt shoulder harness made dressmakers ribbon ends anchored seat edges Velcro Other cabin details instrument panels control stick wheel upholstery usually installed last after model has painted before enclosing com pletely windows windshield canopy instrument panel requires some pre-planning because cases covers models fuel tank prefer fasten panel small wood screws permit removal access tank some time life model fuel tank may need servicing Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Aerobatics/Van Putte Continued page 49 has become difficult old article written almost nobody fiberglass fuselages foam wing still idea Ed Izzos head see Ed some us still remember Balsa structures easier repalr because new piece can cut put place crushed missing piece other hand never dreamed cyanoacrylate CyA adhesives fast-cure epoxies way back real challenges repair fiberglass fuselages damage Im talking about kind fuselage couple wrinkled big chunks rest lot little pieces As long fuselage reasonably intact two three large pieces theres good chance can repaired first part repair procedure very important fuselage must thoroughly cleaned repair will mechanically sound usually use K&B Superpoxy thinner because cleans up almost everything Alcohol lacquer thinner reasonable job good K&B thinner good way test trace oil see well piece masking tape will stick Masking tape wont stick very well theres minute trace oil surface Before starting actual repair its good idea stand back examine damage Sometimes job can made lot easier doing repair certain order Practicing fitting pieces together good procedure follow setting up sequence repair lot fuzzy edges along break wont join together well trim off leaving pieces can pushed together little no gap along break Try trim it. until thing fits well Look places key repair like stripes paint job make sure repair properly aligned tack-glue small sections CyA small steps between two pieces can use fingers inside outside fuselage align Once theyre aligned tack-glue too Work way around repair reducing distance between tack-glue points until everything glued back together pieces missing will filled later Sand inside fuselage side repaired area wipe fuselage inside out solvent get rid dust finger oils Put masking tape outside fuselage across repaired areas use pieces about five inches long Stick down end pull tight across break stick down other end before thoroughly smoothing December 1985 141 C 10 0 C 0 4- Cl 6 C ci 0 0 0 ci V 0 C\I x 00 x 0 -i 0 0 0 0 5 0 LL 1141z11
Edition: Model Aviation - 1985/12
Page Numbers: 46, 47, 136, 137, 141
Scale Bob Dolly Wischer CONTROL CABLES Control surface actuation cable commonly used Scale models aircraft have exposed cables Its notable advantage its light weight short lengths use models no stretch fore no loss motion using stain less steel cable intended operation Control Line models cable inex pensive found hobby shops flexible available various diameters suit model sizes Its main dis advantage cannot soldered Terminations must made swaging Other materials have also used such fish-line leaders plastics experience has slight amount stretch objectionable because motion lost loss varies airspeed have seen control cables fastened directly servo output arms basic fault arrangement im poses constant load servo bear ings lever length too short provide positive control neutralizing preference plywood lever pivoted its center cables fastened end short music wire pushrod connects lever servo output arm disc Lever length can long per mitted fuselage width widebodied models Emeraude example lever eight-in long really important factor cable system lever length distance between cable end pushrod attachment point lever control horn rudder eleva tor can scale length crosssectional size best appearance horn must very secure fastening rudder certain no lost motion also withstand considerable force line tension Once geometry control cable system understood advantages become apparent example control surface travel can altered shifting point lever music wire pushrod pivoted Ordinarily attach pushrod close possible cable attachment points using servo arm length provide desired control surface travel However lever made longer end pushrod pivot 46 Model Aviation Bill Kleinhans brought 93in.span Flesler Starch 85 Mint Julep contest Its Swensen kit uses silk doDe covering Supertigre 75 engIne Mike Wartmans Christen Eagle started Pilot kit Power 05 90 four-StrOke paint scheme entirely masked using acrylic lacquer over World-Tax fabric i-o~er u-vii scratch-built creation Ralph Jackson Power Webra Bully engine Span 80 weight 2075 lb used polyester covering material finished acrylic-lacquermasked frisket Including lozenge-pattern upper surfaces extreme tip long end will reduction control surface travel relative servo motion reverse also true lever having equal lengths side center servo linkage pushrod some point closer lever center controlsurface travel increased relative servo motion leverage advantages can handy whenever servos mounted odd positions often happens Scale models servos spaced close proximity long servo output arm cannot fitted interference levers airplanes made 1/8-in ply center hole drilled close running fit No 5 wood screw screw threaded anchoring block Cnntinupd ~gp Gary Underhills 82-ln-span Curtiss Condor L uses two HP 21 four-stroke engines weIghs 975 lb Sonic Systems air cylinders operate homemade retracts Tartan single powers Fokker EV R built Bob Hanft WW I-era /4scaler has machine gun sound effects during flight Covering material dacron organza CoveritelK&B epoxy Weighs 1875 lb spans 84 7 / Model Magic Epoxy Plus 8 mm 25% lighter Sands & carves like Basswood \ Non sagging gap filling super strength Use anywhere two part epoxy used B fi oz $895 retail equal 8 oz regular epoxy Model Magic Filler Balsa Foam & Fiberglasssands exactly like Balsa Super lightweight Superior adhesion Waterproof Nontoxic Use nicks gaps fillets fairings building up large areas8 fI oz $595 retail shrink turn brittle used gasoline fuel offers clarity visual fuel flow Model Magic - fuel tubing remains flexible plasticizer migration foul engines exhibits outstanding tear abrasion resistence Tubing tinted red easy identification gasoline & diesel use Available 5ff $249/pkg 1 Off $479Ipkg 50ff spools $21 90 Blue Gb-Fuel Tubing Made finest silicone tubing available Less 1% swelling after 150 hours % nitro fuel Available 2 5ff packages 50ff spools i C Inc ThModel Gas & Diesel Tubing Magic Gas & Diesel Fuel Tubing will swell fine products available dealer direct Magic Products PO Box 19784 St Paul MN 55119 715/425-1397 December 1985 47 rare 193Osera Rose Parakeet /3scale oy rat massey nas uperpoxy tinisfl over Koverall used two coats nontautening dope two coats regular butyrate Building repairs asnapwith Model Magic U ma u m N m m FOUR CYCLE ENGINE MOUNTS Cast oluminurn alloy Ground 90 thrust line Brigtrt polish finished Socket cap screws inCluded DRILLED AND TAPPED FOR No Jt-20 OS MAX PS 20600 No JT-4o Undnhled tar 21-40BOO No Jt-41 HPVT21 1000 No JT-42 ENVA 35-40 AC 1000 No JT-43 SAITO PA 30 tOOC NoJT-44 OSMAXPS4O 1000 No JT-45 SAITO PA 40-45 1000 No JT-46 ENA 46 AC 000 Na JT-49 HP VT 49 1200 No JT-60 Undnlled 501 60-901100 No JT-61 OS MAX FS 61 t3O0 No JT-62 Os MAX PS 6075-90t3D0 No JT-64 ESWYA 60-80-90-120 AC 1300 No JT-65 SAITO PA 65 1300 No JT-t20 Und6lled tor 120 t600 No JT-121 ENVA P 120 PC 1800 Na JE-t22 Os MAX PS 120 1800 Na JT -123 SAITO PA t20 800 No JT-125 Super hgre 25-3000 tB00 RC Soaring/Pruss Continued page 133 Pivot areas name impliesa pivoting wing wingerons coupled rudder plus elevator fuselage seamless fiberglass shell wood deck Its 36 inches long wing foam core spruce spars A2-in balsa sheeting Airfoil Eppler 387 Wingspan 60 inches design exceptionally clean no rubberbands screws exposed Micro servos 100-mA battery pack job internally room 225-mA battery pack bird towards sophisticated side kitting packaging quality throughout kit contains hardware pushrods necessary including pivoting wings Cost $6995 available direct-only Dodgson Designs 2904 SW Camano Dr Camano Island WA 98292 thought hand-launch birds boxy-looking very simple design no imagination toward aesthetics Pivot should dispel idea Jim Porter Iowa will help sup port Jim Porters two models Whisper II first has seen Midwest circlesand thermalsfor about last three years open framework fuselage makes design distinctive Controls ailerons elevator Wingspan 55 inches around Eppler 214 airfoil Allup weight 15 ounces can see construction built-up One-eighth-inch spruce longerons shape fuselage A-inch square balsa provides cross bracing contrast Whisper number II has all-sheeted pivoting wing Elevator other control As Whisper both servos mounted fuselage aedilable hobby shop ORDER DIRECT return UPS shIpment Joirir rororie ENGINE TESTING STANDS Steel restraining pins Cast Aluminum tar engine52k JT-Q3A QUADRA 35 Jt-Z34 ZENOAN G-3B IT-TD4 ALTEC ERD 2000 No OrSI JT152JI-QaB QUADRA 25 10 60Garrl sizeA 10 2 5JT-Q5B QUADRA 50 11 50 00JT-Z3B ZENOASI G-3B JT-M38 MAXI 30 2000 SIDE MOUNT MUFFLERS tar PUTS CAP 21 CESSNA 150 etc No JT-40 29-404h 60 1500 4591 12 EXHAUST EXTENSIONS NEOPS5NE JtMI2016 400JINSA , biA 350 JI M55 % 016455J5N38 50 JtNi2 75 78016 600JINOS 00 JtN3A 6 BrA550 GIANT ENGINE MUFFLERS Marched engine tail pipe extensions mounting bolts included Also available tar ATLAS 46 BULLY COBRA KAWASAKI KIORITZ SACH-DOMLER SUPER TIGRE 2500-3000 jt-Q3L QUADRA 35 Jt-Q5L QUADRA 50 Jt-Z3L ZENOAH G-3B JT-TDR ALTEC ERD JT-M3R MAXI 30 JT-Q3R QUADRA 35 JT-QSR QUADRA 50 JT-Z3R ZENOAH G-38 JT-M3L MAXI 30 JT-Q54 QUADRA 50 JT-M34 MAXI 30 2000 JT-Q SS QUADRA 50 JT-M35 MAXI 30 2000 MAIL ORDER Ptease add 250 tar UPS shipping Check MO VISA MC COD accepted Add 200 estra tar COD Calit residenTs add 6% tax -SEND FOR FREE CATALOGAirfoil again Eppler 214 span 61 inches unwritten weight-limit also bumped number II pushes 1TA ounces Well have fans Some thoughts ideas photos thinking small Its fact hand-launch unofficial category novel idea just whim local group fliers Its growing steadily since least 1977 andjudging letters club newslettersthere terest nationwide So maybe its time think-small category think-big con test unofficial event 1986 AMA Nationals event could run day after regular Soaring schedule Pre-registra tion could take place during regular events get idea would compete event could run competing unlike large club con test way regular task force workers wouldnt loaded down extra chores Tasks task could simple Let weather dictate Simple man-on-man five-minute max would help keep things flowing no winches concerned about group could ready box launch area ready fly soon previous groups transmitters clean Since would unofficial event entry fee could too no trophies available let small entry fee say buck two divided up prize money really could minimumhassle/maximum-fun event Think about pass thoughts way Well pass Good lift Dan Pruss 131 E Pennington Ln Plainfield IL 60544 responding advertisers mention read about ModelAviation RC Scale/Wischers Continued page 47 basswood pine lever will pivot freely block needs cemented securely fuselage centerline braced withstand tension cables time concerned about wear center hole also drilled holes cable attachment used short lengths brass tube bush ings plywood later airplanes bushings have omitted no detrimental effects plywood isnt worn away flight operations after years use rudder horn l/8-in-thick plywood average models would too heavy correct scale appearance Thinner plywood should have brass bushings epoxied place long life tube needs slightly longer horn thickness common Control Line sevenstrand wire size purposes 018 diameter 1/2-in length 062-in outside diameter aluminum tube flat tened slightly squeezing gently between wide jaws electricians pliers Unless flattened tube will accom modate two wires 018 diameter Thread length tube wire sert wire back through tube Slide tube toward lever shorten loop crimp tube tightly squeezing pliers larger airplanes have using 021 diameter wire two will fit within aluminum tube though has made oval squeez ing Rather use larger-size tube ream out 062-in tube No 63 037 No 62 038 diameter drill before changing its shape oval no need large gaping holes fuselage sides wires emerge After model completed painted 1 36 Model Aviation 2000 determine exact hole locations measurement drill use length %2-in music wire about two feet long ground sharp chisel point rotated electric hand drill hole started piercing fuselage side scriber music wire drill tip will wander mar finish Bits masking tape stuck fuselage side act aiming point combination rudder horn wire attachment holes direct music wire drill proper path drill aimed comes out very close end lever inside fuselage should happen bulkhead path drill its plywood drill will penetrate continue straight path course could have done previously during fuselage con struction rudder already hinged minor problem finding drilled hole covered finished fuselage afterward intent have no bends wire rudder horn lever no friction points along way spoil freely-operating system usual assembly sequence thread lengths wire through holes fasten crimp lever end loosely loop wires through rudder horn tubes Gradually tighten wire sliding through horn tube until rudder held its neutral position lever other end held right angles fuselage longitudinal axis done servo mounted place receiver transmitter turned maintain lever its true neutral position Use pliers pull wire ends placing equal tension wires sliding tube shorten loop before final crimping tubes connection extremely positive Concerned about effect steel wires close parallel receiver antenna Scale models since 1970 have antenna inside fuselage along wires has never range problem because using Kraft Royal Ace radios doubt check both ways antenna inside outside fuselage have found no difference Fiberglass cowls letter Jack Schwartz included some suggestions improvements method produc ing fiberglass cowls over foam cores described July 1985 column As last layer place fiberglass cloth Jack uses portion panty hose stretched over cowl form mounted end broomstick clamped vise panty hose pushed pulled stretched ends tied underneath After minute com plete stretch smooth resin ex trudes through panty hose weave us ing stick brush fingers what ever handy about 15 minutes dab off excess epoxy working front back cowl finished product surface requires no sanding Jack also has other methods using panty hose An entire fuselage can covered piece rear either fiberglass balsa sheeting over openwork structure open structure first uses three light coats nitrate dope fill pores cover ing After 48-hour cure time applies heat iron medium heat setting panty hose material pulls up tight drum large fuselages covering wings suggests buying queen-size jumbo-size panty hose definitions Jack says its tough called Panty Hose Kid age 71 Jack has fourdigit AMA number Four-stroke glow plugs Approximately 25 years ago appeared hobby market glow plug made makers Champion spark plugs labeled VG-2 same ad standard glow plug appearance closely resembled regular porcelaininsulated spark plug miniature familiar red lettering imprinted used until first glo bar plugs came along put aside better idling afforded newer glow plugs Someone suggested old Cham pion glow plugs well suited operation four-stroke engine searched through pile discarded engine parts found pair Champion plugs new condition Opera tion better expected extra 200 rpm top end extremely slow idle excellent transition OS Gemini twin 120 Champion plugs look exactly like spark plugs have asked countless occasions wheth er Gemini ignition standpoint Scale appearance great improvement over model Slow plugs small problem wrench fit plug body wont fit inside Gemini cooling fins its cylinder heads turned down standard six-ppint hex socket thinner walls provide clearance fins Find someone has modeling 25 years Beg bor row steal cast-off Champion glow plugs try four-stroke provided course isnt four-stroke engines reputation unlimited life Cabin interiors reader requests infor mation about cabin interior detail done beginning fuselage con struction after completion model answer little large doors hatches removable canopy permit easy access interior much detail can applied finished airplane openings small work needs done early fuselage construction fuselage having visible steel tubes Continued page 141 ggggg eSOOeOO OOOOOggOOOOO 0 & m aa hi S no vg o E3 80 El0 S 0 0 S 6 0 408 S -0~0-0000 00 0 no 0o 80 8- __ _ 00000 0OU C05 C88Z8n0 O~C9o00 S IUJEiII 0 0 SS 0 0 0 100000000000006600 5080~~80 O5.non5~ n F 0008g S a- F 5 E5S F V05 000000005 F 800 S z December 1985 137 00 F 58 -C8) RC Scale/Wischers Continued page 137 formed aluminum bulkheads parts built structure before ex ternal sheeting applied Tubes can represented wood dowels fastened ordinary model cement glue Aluminum tubes can also employed present problem fastening joints unless modeler adept brazing joints either wood aluminum must absolutely secure will loose parts rattling around side fuselage after first bad land ing best paint parts before covering fuselage exterior surfaces Civil aircraft types likely have smoothly-finished interior military planes will show open structure smooth interior balsa styrene sheets can built desired ef fect Keeping mind difficulty working through small openings fin ishing interior best apply paint work progresses rather try paint inside afterward nearly impossible spray inside cabin completed fuselage military types inner sur face covering material becomes cockpit wall canopy can made removable access cockpit Working through small cabin door worst possible situation Consider building access hatch fuselage bottom less conspicuous top hatch visible edges smooth surfaces should exist least desirable airplanes radio equipment has installed cockpit area compound problem making pre sentable interior Seats floors must somehow made removable servicing installation servos battery receiver recent models us ing Velcro hold seats floors example seat held four small scraps about / x 1 in size Velcro area too large balsa seat struc ture will come unglued abuse removal use smaller pieces light pull will extract seat yet held tight withstand accidental motion bad landing has never shaken loose seat planes dummy pilot can held place means seat belt shoulder harness made dressmakers ribbon ends anchored seat edges Velcro Other cabin details instrument panels control stick wheel upholstery usually installed last after model has painted before enclosing com pletely windows windshield canopy instrument panel requires some pre-planning because cases covers models fuel tank prefer fasten panel small wood screws permit removal access tank some time life model fuel tank may need servicing Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Aerobatics/Van Putte Continued page 49 has become difficult old article written almost nobody fiberglass fuselages foam wing still idea Ed Izzos head see Ed some us still remember Balsa structures easier repalr because new piece can cut put place crushed missing piece other hand never dreamed cyanoacrylate CyA adhesives fast-cure epoxies way back real challenges repair fiberglass fuselages damage Im talking about kind fuselage couple wrinkled big chunks rest lot little pieces As long fuselage reasonably intact two three large pieces theres good chance can repaired first part repair procedure very important fuselage must thoroughly cleaned repair will mechanically sound usually use K&B Superpoxy thinner because cleans up almost everything Alcohol lacquer thinner reasonable job good K&B thinner good way test trace oil see well piece masking tape will stick Masking tape wont stick very well theres minute trace oil surface Before starting actual repair its good idea stand back examine damage Sometimes job can made lot easier doing repair certain order Practicing fitting pieces together good procedure follow setting up sequence repair lot fuzzy edges along break wont join together well trim off leaving pieces can pushed together little no gap along break Try trim it. until thing fits well Look places key repair like stripes paint job make sure repair properly aligned tack-glue small sections CyA small steps between two pieces can use fingers inside outside fuselage align Once theyre aligned tack-glue too Work way around repair reducing distance between tack-glue points until everything glued back together pieces missing will filled later Sand inside fuselage side repaired area wipe fuselage inside out solvent get rid dust finger oils Put masking tape outside fuselage across repaired areas use pieces about five inches long Stick down end pull tight across break stick down other end before thoroughly smoothing December 1985 141 C 10 0 C 0 4- Cl 6 C ci 0 0 0 ci V 0 C\I x 00 x 0 -i 0 0 0 0 5 0 LL 1141z11
Edition: Model Aviation - 1985/12
Page Numbers: 46, 47, 136, 137, 141
Scale Bob Dolly Wischer CONTROL CABLES Control surface actuation cable commonly used Scale models aircraft have exposed cables Its notable advantage its light weight short lengths use models no stretch fore no loss motion using stain less steel cable intended operation Control Line models cable inex pensive found hobby shops flexible available various diameters suit model sizes Its main dis advantage cannot soldered Terminations must made swaging Other materials have also used such fish-line leaders plastics experience has slight amount stretch objectionable because motion lost loss varies airspeed have seen control cables fastened directly servo output arms basic fault arrangement im poses constant load servo bear ings lever length too short provide positive control neutralizing preference plywood lever pivoted its center cables fastened end short music wire pushrod connects lever servo output arm disc Lever length can long per mitted fuselage width widebodied models Emeraude example lever eight-in long really important factor cable system lever length distance between cable end pushrod attachment point lever control horn rudder eleva tor can scale length crosssectional size best appearance horn must very secure fastening rudder certain no lost motion also withstand considerable force line tension Once geometry control cable system understood advantages become apparent example control surface travel can altered shifting point lever music wire pushrod pivoted Ordinarily attach pushrod close possible cable attachment points using servo arm length provide desired control surface travel However lever made longer end pushrod pivot 46 Model Aviation Bill Kleinhans brought 93in.span Flesler Starch 85 Mint Julep contest Its Swensen kit uses silk doDe covering Supertigre 75 engIne Mike Wartmans Christen Eagle started Pilot kit Power 05 90 four-StrOke paint scheme entirely masked using acrylic lacquer over World-Tax fabric i-o~er u-vii scratch-built creation Ralph Jackson Power Webra Bully engine Span 80 weight 2075 lb used polyester covering material finished acrylic-lacquermasked frisket Including lozenge-pattern upper surfaces extreme tip long end will reduction control surface travel relative servo motion reverse also true lever having equal lengths side center servo linkage pushrod some point closer lever center controlsurface travel increased relative servo motion leverage advantages can handy whenever servos mounted odd positions often happens Scale models servos spaced close proximity long servo output arm cannot fitted interference levers airplanes made 1/8-in ply center hole drilled close running fit No 5 wood screw screw threaded anchoring block Cnntinupd ~gp Gary Underhills 82-ln-span Curtiss Condor L uses two HP 21 four-stroke engines weIghs 975 lb Sonic Systems air cylinders operate homemade retracts Tartan single powers Fokker EV R built Bob Hanft WW I-era /4scaler has machine gun sound effects during flight Covering material dacron organza CoveritelK&B epoxy Weighs 1875 lb spans 84 7 / Model Magic Epoxy Plus 8 mm 25% lighter Sands & carves like Basswood \ Non sagging gap filling super strength Use anywhere two part epoxy used B fi oz $895 retail equal 8 oz regular epoxy Model Magic Filler Balsa Foam & Fiberglasssands exactly like Balsa Super lightweight Superior adhesion Waterproof Nontoxic Use nicks gaps fillets fairings building up large areas8 fI oz $595 retail shrink turn brittle used gasoline fuel offers clarity visual fuel flow Model Magic - fuel tubing remains flexible plasticizer migration foul engines exhibits outstanding tear abrasion resistence Tubing tinted red easy identification gasoline & diesel use Available 5ff $249/pkg 1 Off $479Ipkg 50ff spools $21 90 Blue Gb-Fuel Tubing Made finest silicone tubing available Less 1% swelling after 150 hours % nitro fuel Available 2 5ff packages 50ff spools i C Inc ThModel Gas & Diesel Tubing Magic Gas & Diesel Fuel Tubing will swell fine products available dealer direct Magic Products PO Box 19784 St Paul MN 55119 715/425-1397 December 1985 47 rare 193Osera Rose Parakeet /3scale oy rat massey nas uperpoxy tinisfl over Koverall used two coats nontautening dope two coats regular butyrate Building repairs asnapwith Model Magic U ma u m N m m FOUR CYCLE ENGINE MOUNTS Cast oluminurn alloy Ground 90 thrust line Brigtrt polish finished Socket cap screws inCluded DRILLED AND TAPPED FOR No Jt-20 OS MAX PS 20600 No JT-4o Undnhled tar 21-40BOO No Jt-41 HPVT21 1000 No JT-42 ENVA 35-40 AC 1000 No JT-43 SAITO PA 30 tOOC NoJT-44 OSMAXPS4O 1000 No JT-45 SAITO PA 40-45 1000 No JT-46 ENA 46 AC 000 Na JT-49 HP VT 49 1200 No JT-60 Undnlled 501 60-901100 No JT-61 OS MAX FS 61 t3O0 No JT-62 Os MAX PS 6075-90t3D0 No JT-64 ESWYA 60-80-90-120 AC 1300 No JT-65 SAITO PA 65 1300 No JT-t20 Und6lled tor 120 t600 No JT-121 ENVA P 120 PC 1800 Na JE-t22 Os MAX PS 120 1800 Na JT -123 SAITO PA t20 800 No JT-125 Super hgre 25-3000 tB00 RC Soaring/Pruss Continued page 133 Pivot areas name impliesa pivoting wing wingerons coupled rudder plus elevator fuselage seamless fiberglass shell wood deck Its 36 inches long wing foam core spruce spars A2-in balsa sheeting Airfoil Eppler 387 Wingspan 60 inches design exceptionally clean no rubberbands screws exposed Micro servos 100-mA battery pack job internally room 225-mA battery pack bird towards sophisticated side kitting packaging quality throughout kit contains hardware pushrods necessary including pivoting wings Cost $6995 available direct-only Dodgson Designs 2904 SW Camano Dr Camano Island WA 98292 thought hand-launch birds boxy-looking very simple design no imagination toward aesthetics Pivot should dispel idea Jim Porter Iowa will help sup port Jim Porters two models Whisper II first has seen Midwest circlesand thermalsfor about last three years open framework fuselage makes design distinctive Controls ailerons elevator Wingspan 55 inches around Eppler 214 airfoil Allup weight 15 ounces can see construction built-up One-eighth-inch spruce longerons shape fuselage A-inch square balsa provides cross bracing contrast Whisper number II has all-sheeted pivoting wing Elevator other control As Whisper both servos mounted fuselage aedilable hobby shop ORDER DIRECT return UPS shIpment Joirir rororie ENGINE TESTING STANDS Steel restraining pins Cast Aluminum tar engine52k JT-Q3A QUADRA 35 Jt-Z34 ZENOAN G-3B IT-TD4 ALTEC ERD 2000 No OrSI JT152JI-QaB QUADRA 25 10 60Garrl sizeA 10 2 5JT-Q5B QUADRA 50 11 50 00JT-Z3B ZENOASI G-3B JT-M38 MAXI 30 2000 SIDE MOUNT MUFFLERS tar PUTS CAP 21 CESSNA 150 etc No JT-40 29-404h 60 1500 4591 12 EXHAUST EXTENSIONS NEOPS5NE JtMI2016 400JINSA , biA 350 JI M55 % 016455J5N38 50 JtNi2 75 78016 600JINOS 00 JtN3A 6 BrA550 GIANT ENGINE MUFFLERS Marched engine tail pipe extensions mounting bolts included Also available tar ATLAS 46 BULLY COBRA KAWASAKI KIORITZ SACH-DOMLER SUPER TIGRE 2500-3000 jt-Q3L QUADRA 35 Jt-Q5L QUADRA 50 Jt-Z3L ZENOAH G-3B JT-TDR ALTEC ERD JT-M3R MAXI 30 JT-Q3R QUADRA 35 JT-QSR QUADRA 50 JT-Z3R ZENOAH G-38 JT-M3L MAXI 30 JT-Q54 QUADRA 50 JT-M34 MAXI 30 2000 JT-Q SS QUADRA 50 JT-M35 MAXI 30 2000 MAIL ORDER Ptease add 250 tar UPS shipping Check MO VISA MC COD accepted Add 200 estra tar COD Calit residenTs add 6% tax -SEND FOR FREE CATALOGAirfoil again Eppler 214 span 61 inches unwritten weight-limit also bumped number II pushes 1TA ounces Well have fans Some thoughts ideas photos thinking small Its fact hand-launch unofficial category novel idea just whim local group fliers Its growing steadily since least 1977 andjudging letters club newslettersthere terest nationwide So maybe its time think-small category think-big con test unofficial event 1986 AMA Nationals event could run day after regular Soaring schedule Pre-registra tion could take place during regular events get idea would compete event could run competing unlike large club con test way regular task force workers wouldnt loaded down extra chores Tasks task could simple Let weather dictate Simple man-on-man five-minute max would help keep things flowing no winches concerned about group could ready box launch area ready fly soon previous groups transmitters clean Since would unofficial event entry fee could too no trophies available let small entry fee say buck two divided up prize money really could minimumhassle/maximum-fun event Think about pass thoughts way Well pass Good lift Dan Pruss 131 E Pennington Ln Plainfield IL 60544 responding advertisers mention read about ModelAviation RC Scale/Wischers Continued page 47 basswood pine lever will pivot freely block needs cemented securely fuselage centerline braced withstand tension cables time concerned about wear center hole also drilled holes cable attachment used short lengths brass tube bush ings plywood later airplanes bushings have omitted no detrimental effects plywood isnt worn away flight operations after years use rudder horn l/8-in-thick plywood average models would too heavy correct scale appearance Thinner plywood should have brass bushings epoxied place long life tube needs slightly longer horn thickness common Control Line sevenstrand wire size purposes 018 diameter 1/2-in length 062-in outside diameter aluminum tube flat tened slightly squeezing gently between wide jaws electricians pliers Unless flattened tube will accom modate two wires 018 diameter Thread length tube wire sert wire back through tube Slide tube toward lever shorten loop crimp tube tightly squeezing pliers larger airplanes have using 021 diameter wire two will fit within aluminum tube though has made oval squeez ing Rather use larger-size tube ream out 062-in tube No 63 037 No 62 038 diameter drill before changing its shape oval no need large gaping holes fuselage sides wires emerge After model completed painted 1 36 Model Aviation 2000 determine exact hole locations measurement drill use length %2-in music wire about two feet long ground sharp chisel point rotated electric hand drill hole started piercing fuselage side scriber music wire drill tip will wander mar finish Bits masking tape stuck fuselage side act aiming point combination rudder horn wire attachment holes direct music wire drill proper path drill aimed comes out very close end lever inside fuselage should happen bulkhead path drill its plywood drill will penetrate continue straight path course could have done previously during fuselage con struction rudder already hinged minor problem finding drilled hole covered finished fuselage afterward intent have no bends wire rudder horn lever no friction points along way spoil freely-operating system usual assembly sequence thread lengths wire through holes fasten crimp lever end loosely loop wires through rudder horn tubes Gradually tighten wire sliding through horn tube until rudder held its neutral position lever other end held right angles fuselage longitudinal axis done servo mounted place receiver transmitter turned maintain lever its true neutral position Use pliers pull wire ends placing equal tension wires sliding tube shorten loop before final crimping tubes connection extremely positive Concerned about effect steel wires close parallel receiver antenna Scale models since 1970 have antenna inside fuselage along wires has never range problem because using Kraft Royal Ace radios doubt check both ways antenna inside outside fuselage have found no difference Fiberglass cowls letter Jack Schwartz included some suggestions improvements method produc ing fiberglass cowls over foam cores described July 1985 column As last layer place fiberglass cloth Jack uses portion panty hose stretched over cowl form mounted end broomstick clamped vise panty hose pushed pulled stretched ends tied underneath After minute com plete stretch smooth resin ex trudes through panty hose weave us ing stick brush fingers what ever handy about 15 minutes dab off excess epoxy working front back cowl finished product surface requires no sanding Jack also has other methods using panty hose An entire fuselage can covered piece rear either fiberglass balsa sheeting over openwork structure open structure first uses three light coats nitrate dope fill pores cover ing After 48-hour cure time applies heat iron medium heat setting panty hose material pulls up tight drum large fuselages covering wings suggests buying queen-size jumbo-size panty hose definitions Jack says its tough called Panty Hose Kid age 71 Jack has fourdigit AMA number Four-stroke glow plugs Approximately 25 years ago appeared hobby market glow plug made makers Champion spark plugs labeled VG-2 same ad standard glow plug appearance closely resembled regular porcelaininsulated spark plug miniature familiar red lettering imprinted used until first glo bar plugs came along put aside better idling afforded newer glow plugs Someone suggested old Cham pion glow plugs well suited operation four-stroke engine searched through pile discarded engine parts found pair Champion plugs new condition Opera tion better expected extra 200 rpm top end extremely slow idle excellent transition OS Gemini twin 120 Champion plugs look exactly like spark plugs have asked countless occasions wheth er Gemini ignition standpoint Scale appearance great improvement over model Slow plugs small problem wrench fit plug body wont fit inside Gemini cooling fins its cylinder heads turned down standard six-ppint hex socket thinner walls provide clearance fins Find someone has modeling 25 years Beg bor row steal cast-off Champion glow plugs try four-stroke provided course isnt four-stroke engines reputation unlimited life Cabin interiors reader requests infor mation about cabin interior detail done beginning fuselage con struction after completion model answer little large doors hatches removable canopy permit easy access interior much detail can applied finished airplane openings small work needs done early fuselage construction fuselage having visible steel tubes Continued page 141 ggggg eSOOeOO OOOOOggOOOOO 0 & m aa hi S no vg o E3 80 El0 S 0 0 S 6 0 408 S -0~0-0000 00 0 no 0o 80 8- __ _ 00000 0OU C05 C88Z8n0 O~C9o00 S IUJEiII 0 0 SS 0 0 0 100000000000006600 5080~~80 O5.non5~ n F 0008g S a- F 5 E5S F V05 000000005 F 800 S z December 1985 137 00 F 58 -C8) RC Scale/Wischers Continued page 137 formed aluminum bulkheads parts built structure before ex ternal sheeting applied Tubes can represented wood dowels fastened ordinary model cement glue Aluminum tubes can also employed present problem fastening joints unless modeler adept brazing joints either wood aluminum must absolutely secure will loose parts rattling around side fuselage after first bad land ing best paint parts before covering fuselage exterior surfaces Civil aircraft types likely have smoothly-finished interior military planes will show open structure smooth interior balsa styrene sheets can built desired ef fect Keeping mind difficulty working through small openings fin ishing interior best apply paint work progresses rather try paint inside afterward nearly impossible spray inside cabin completed fuselage military types inner sur face covering material becomes cockpit wall canopy can made removable access cockpit Working through small cabin door worst possible situation Consider building access hatch fuselage bottom less conspicuous top hatch visible edges smooth surfaces should exist least desirable airplanes radio equipment has installed cockpit area compound problem making pre sentable interior Seats floors must somehow made removable servicing installation servos battery receiver recent models us ing Velcro hold seats floors example seat held four small scraps about / x 1 in size Velcro area too large balsa seat struc ture will come unglued abuse removal use smaller pieces light pull will extract seat yet held tight withstand accidental motion bad landing has never shaken loose seat planes dummy pilot can held place means seat belt shoulder harness made dressmakers ribbon ends anchored seat edges Velcro Other cabin details instrument panels control stick wheel upholstery usually installed last after model has painted before enclosing com pletely windows windshield canopy instrument panel requires some pre-planning because cases covers models fuel tank prefer fasten panel small wood screws permit removal access tank some time life model fuel tank may need servicing Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Aerobatics/Van Putte Continued page 49 has become difficult old article written almost nobody fiberglass fuselages foam wing still idea Ed Izzos head see Ed some us still remember Balsa structures easier repalr because new piece can cut put place crushed missing piece other hand never dreamed cyanoacrylate CyA adhesives fast-cure epoxies way back real challenges repair fiberglass fuselages damage Im talking about kind fuselage couple wrinkled big chunks rest lot little pieces As long fuselage reasonably intact two three large pieces theres good chance can repaired first part repair procedure very important fuselage must thoroughly cleaned repair will mechanically sound usually use K&B Superpoxy thinner because cleans up almost everything Alcohol lacquer thinner reasonable job good K&B thinner good way test trace oil see well piece masking tape will stick Masking tape wont stick very well theres minute trace oil surface Before starting actual repair its good idea stand back examine damage Sometimes job can made lot easier doing repair certain order Practicing fitting pieces together good procedure follow setting up sequence repair lot fuzzy edges along break wont join together well trim off leaving pieces can pushed together little no gap along break Try trim it. until thing fits well Look places key repair like stripes paint job make sure repair properly aligned tack-glue small sections CyA small steps between two pieces can use fingers inside outside fuselage align Once theyre aligned tack-glue too Work way around repair reducing distance between tack-glue points until everything glued back together pieces missing will filled later Sand inside fuselage side repaired area wipe fuselage inside out solvent get rid dust finger oils Put masking tape outside fuselage across repaired areas use pieces about five inches long Stick down end pull tight across break stick down other end before thoroughly smoothing December 1985 141 C 10 0 C 0 4- Cl 6 C ci 0 0 0 ci V 0 C\I x 00 x 0 -i 0 0 0 0 5 0 LL 1141z11
Edition: Model Aviation - 1985/12
Page Numbers: 46, 47, 136, 137, 141
Scale Bob Dolly Wischer CONTROL CABLES Control surface actuation cable commonly used Scale models aircraft have exposed cables Its notable advantage its light weight short lengths use models no stretch fore no loss motion using stain less steel cable intended operation Control Line models cable inex pensive found hobby shops flexible available various diameters suit model sizes Its main dis advantage cannot soldered Terminations must made swaging Other materials have also used such fish-line leaders plastics experience has slight amount stretch objectionable because motion lost loss varies airspeed have seen control cables fastened directly servo output arms basic fault arrangement im poses constant load servo bear ings lever length too short provide positive control neutralizing preference plywood lever pivoted its center cables fastened end short music wire pushrod connects lever servo output arm disc Lever length can long per mitted fuselage width widebodied models Emeraude example lever eight-in long really important factor cable system lever length distance between cable end pushrod attachment point lever control horn rudder eleva tor can scale length crosssectional size best appearance horn must very secure fastening rudder certain no lost motion also withstand considerable force line tension Once geometry control cable system understood advantages become apparent example control surface travel can altered shifting point lever music wire pushrod pivoted Ordinarily attach pushrod close possible cable attachment points using servo arm length provide desired control surface travel However lever made longer end pushrod pivot 46 Model Aviation Bill Kleinhans brought 93in.span Flesler Starch 85 Mint Julep contest Its Swensen kit uses silk doDe covering Supertigre 75 engIne Mike Wartmans Christen Eagle started Pilot kit Power 05 90 four-StrOke paint scheme entirely masked using acrylic lacquer over World-Tax fabric i-o~er u-vii scratch-built creation Ralph Jackson Power Webra Bully engine Span 80 weight 2075 lb used polyester covering material finished acrylic-lacquermasked frisket Including lozenge-pattern upper surfaces extreme tip long end will reduction control surface travel relative servo motion reverse also true lever having equal lengths side center servo linkage pushrod some point closer lever center controlsurface travel increased relative servo motion leverage advantages can handy whenever servos mounted odd positions often happens Scale models servos spaced close proximity long servo output arm cannot fitted interference levers airplanes made 1/8-in ply center hole drilled close running fit No 5 wood screw screw threaded anchoring block Cnntinupd ~gp Gary Underhills 82-ln-span Curtiss Condor L uses two HP 21 four-stroke engines weIghs 975 lb Sonic Systems air cylinders operate homemade retracts Tartan single powers Fokker EV R built Bob Hanft WW I-era /4scaler has machine gun sound effects during flight Covering material dacron organza CoveritelK&B epoxy Weighs 1875 lb spans 84 7 / Model Magic Epoxy Plus 8 mm 25% lighter Sands & carves like Basswood \ Non sagging gap filling super strength Use anywhere two part epoxy used B fi oz $895 retail equal 8 oz regular epoxy Model Magic Filler Balsa Foam & Fiberglasssands exactly like Balsa Super lightweight Superior adhesion Waterproof Nontoxic Use nicks gaps fillets fairings building up large areas8 fI oz $595 retail shrink turn brittle used gasoline fuel offers clarity visual fuel flow Model Magic - fuel tubing remains flexible plasticizer migration foul engines exhibits outstanding tear abrasion resistence Tubing tinted red easy identification gasoline & diesel use Available 5ff $249/pkg 1 Off $479Ipkg 50ff spools $21 90 Blue Gb-Fuel Tubing Made finest silicone tubing available Less 1% swelling after 150 hours % nitro fuel Available 2 5ff packages 50ff spools i C Inc ThModel Gas & Diesel Tubing Magic Gas & Diesel Fuel Tubing will swell fine products available dealer direct Magic Products PO Box 19784 St Paul MN 55119 715/425-1397 December 1985 47 rare 193Osera Rose Parakeet /3scale oy rat massey nas uperpoxy tinisfl over Koverall used two coats nontautening dope two coats regular butyrate Building repairs asnapwith Model Magic U ma u m N m m FOUR CYCLE ENGINE MOUNTS Cast oluminurn alloy Ground 90 thrust line Brigtrt polish finished Socket cap screws inCluded DRILLED AND TAPPED FOR No Jt-20 OS MAX PS 20600 No JT-4o Undnhled tar 21-40BOO No Jt-41 HPVT21 1000 No JT-42 ENVA 35-40 AC 1000 No JT-43 SAITO PA 30 tOOC NoJT-44 OSMAXPS4O 1000 No JT-45 SAITO PA 40-45 1000 No JT-46 ENA 46 AC 000 Na JT-49 HP VT 49 1200 No JT-60 Undnlled 501 60-901100 No JT-61 OS MAX FS 61 t3O0 No JT-62 Os MAX PS 6075-90t3D0 No JT-64 ESWYA 60-80-90-120 AC 1300 No JT-65 SAITO PA 65 1300 No JT-t20 Und6lled tor 120 t600 No JT-121 ENVA P 120 PC 1800 Na JE-t22 Os MAX PS 120 1800 Na JT -123 SAITO PA t20 800 No JT-125 Super hgre 25-3000 tB00 RC Soaring/Pruss Continued page 133 Pivot areas name impliesa pivoting wing wingerons coupled rudder plus elevator fuselage seamless fiberglass shell wood deck Its 36 inches long wing foam core spruce spars A2-in balsa sheeting Airfoil Eppler 387 Wingspan 60 inches design exceptionally clean no rubberbands screws exposed Micro servos 100-mA battery pack job internally room 225-mA battery pack bird towards sophisticated side kitting packaging quality throughout kit contains hardware pushrods necessary including pivoting wings Cost $6995 available direct-only Dodgson Designs 2904 SW Camano Dr Camano Island WA 98292 thought hand-launch birds boxy-looking very simple design no imagination toward aesthetics Pivot should dispel idea Jim Porter Iowa will help sup port Jim Porters two models Whisper II first has seen Midwest circlesand thermalsfor about last three years open framework fuselage makes design distinctive Controls ailerons elevator Wingspan 55 inches around Eppler 214 airfoil Allup weight 15 ounces can see construction built-up One-eighth-inch spruce longerons shape fuselage A-inch square balsa provides cross bracing contrast Whisper number II has all-sheeted pivoting wing Elevator other control As Whisper both servos mounted fuselage aedilable hobby shop ORDER DIRECT return UPS shIpment Joirir rororie ENGINE TESTING STANDS Steel restraining pins Cast Aluminum tar engine52k JT-Q3A QUADRA 35 Jt-Z34 ZENOAN G-3B IT-TD4 ALTEC ERD 2000 No OrSI JT152JI-QaB QUADRA 25 10 60Garrl sizeA 10 2 5JT-Q5B QUADRA 50 11 50 00JT-Z3B ZENOASI G-3B JT-M38 MAXI 30 2000 SIDE MOUNT MUFFLERS tar PUTS CAP 21 CESSNA 150 etc No JT-40 29-404h 60 1500 4591 12 EXHAUST EXTENSIONS NEOPS5NE JtMI2016 400JINSA , biA 350 JI M55 % 016455J5N38 50 JtNi2 75 78016 600JINOS 00 JtN3A 6 BrA550 GIANT ENGINE MUFFLERS Marched engine tail pipe extensions mounting bolts included Also available tar ATLAS 46 BULLY COBRA KAWASAKI KIORITZ SACH-DOMLER SUPER TIGRE 2500-3000 jt-Q3L QUADRA 35 Jt-Q5L QUADRA 50 Jt-Z3L ZENOAH G-3B JT-TDR ALTEC ERD JT-M3R MAXI 30 JT-Q3R QUADRA 35 JT-QSR QUADRA 50 JT-Z3R ZENOAH G-38 JT-M3L MAXI 30 JT-Q54 QUADRA 50 JT-M34 MAXI 30 2000 JT-Q SS QUADRA 50 JT-M35 MAXI 30 2000 MAIL ORDER Ptease add 250 tar UPS shipping Check MO VISA MC COD accepted Add 200 estra tar COD Calit residenTs add 6% tax -SEND FOR FREE CATALOGAirfoil again Eppler 214 span 61 inches unwritten weight-limit also bumped number II pushes 1TA ounces Well have fans Some thoughts ideas photos thinking small Its fact hand-launch unofficial category novel idea just whim local group fliers Its growing steadily since least 1977 andjudging letters club newslettersthere terest nationwide So maybe its time think-small category think-big con test unofficial event 1986 AMA Nationals event could run day after regular Soaring schedule Pre-registra tion could take place during regular events get idea would compete event could run competing unlike large club con test way regular task force workers wouldnt loaded down extra chores Tasks task could simple Let weather dictate Simple man-on-man five-minute max would help keep things flowing no winches concerned about group could ready box launch area ready fly soon previous groups transmitters clean Since would unofficial event entry fee could too no trophies available let small entry fee say buck two divided up prize money really could minimumhassle/maximum-fun event Think about pass thoughts way Well pass Good lift Dan Pruss 131 E Pennington Ln Plainfield IL 60544 responding advertisers mention read about ModelAviation RC Scale/Wischers Continued page 47 basswood pine lever will pivot freely block needs cemented securely fuselage centerline braced withstand tension cables time concerned about wear center hole also drilled holes cable attachment used short lengths brass tube bush ings plywood later airplanes bushings have omitted no detrimental effects plywood isnt worn away flight operations after years use rudder horn l/8-in-thick plywood average models would too heavy correct scale appearance Thinner plywood should have brass bushings epoxied place long life tube needs slightly longer horn thickness common Control Line sevenstrand wire size purposes 018 diameter 1/2-in length 062-in outside diameter aluminum tube flat tened slightly squeezing gently between wide jaws electricians pliers Unless flattened tube will accom modate two wires 018 diameter Thread length tube wire sert wire back through tube Slide tube toward lever shorten loop crimp tube tightly squeezing pliers larger airplanes have using 021 diameter wire two will fit within aluminum tube though has made oval squeez ing Rather use larger-size tube ream out 062-in tube No 63 037 No 62 038 diameter drill before changing its shape oval no need large gaping holes fuselage sides wires emerge After model completed painted 1 36 Model Aviation 2000 determine exact hole locations measurement drill use length %2-in music wire about two feet long ground sharp chisel point rotated electric hand drill hole started piercing fuselage side scriber music wire drill tip will wander mar finish Bits masking tape stuck fuselage side act aiming point combination rudder horn wire attachment holes direct music wire drill proper path drill aimed comes out very close end lever inside fuselage should happen bulkhead path drill its plywood drill will penetrate continue straight path course could have done previously during fuselage con struction rudder already hinged minor problem finding drilled hole covered finished fuselage afterward intent have no bends wire rudder horn lever no friction points along way spoil freely-operating system usual assembly sequence thread lengths wire through holes fasten crimp lever end loosely loop wires through rudder horn tubes Gradually tighten wire sliding through horn tube until rudder held its neutral position lever other end held right angles fuselage longitudinal axis done servo mounted place receiver transmitter turned maintain lever its true neutral position Use pliers pull wire ends placing equal tension wires sliding tube shorten loop before final crimping tubes connection extremely positive Concerned about effect steel wires close parallel receiver antenna Scale models since 1970 have antenna inside fuselage along wires has never range problem because using Kraft Royal Ace radios doubt check both ways antenna inside outside fuselage have found no difference Fiberglass cowls letter Jack Schwartz included some suggestions improvements method produc ing fiberglass cowls over foam cores described July 1985 column As last layer place fiberglass cloth Jack uses portion panty hose stretched over cowl form mounted end broomstick clamped vise panty hose pushed pulled stretched ends tied underneath After minute com plete stretch smooth resin ex trudes through panty hose weave us ing stick brush fingers what ever handy about 15 minutes dab off excess epoxy working front back cowl finished product surface requires no sanding Jack also has other methods using panty hose An entire fuselage can covered piece rear either fiberglass balsa sheeting over openwork structure open structure first uses three light coats nitrate dope fill pores cover ing After 48-hour cure time applies heat iron medium heat setting panty hose material pulls up tight drum large fuselages covering wings suggests buying queen-size jumbo-size panty hose definitions Jack says its tough called Panty Hose Kid age 71 Jack has fourdigit AMA number Four-stroke glow plugs Approximately 25 years ago appeared hobby market glow plug made makers Champion spark plugs labeled VG-2 same ad standard glow plug appearance closely resembled regular porcelaininsulated spark plug miniature familiar red lettering imprinted used until first glo bar plugs came along put aside better idling afforded newer glow plugs Someone suggested old Cham pion glow plugs well suited operation four-stroke engine searched through pile discarded engine parts found pair Champion plugs new condition Opera tion better expected extra 200 rpm top end extremely slow idle excellent transition OS Gemini twin 120 Champion plugs look exactly like spark plugs have asked countless occasions wheth er Gemini ignition standpoint Scale appearance great improvement over model Slow plugs small problem wrench fit plug body wont fit inside Gemini cooling fins its cylinder heads turned down standard six-ppint hex socket thinner walls provide clearance fins Find someone has modeling 25 years Beg bor row steal cast-off Champion glow plugs try four-stroke provided course isnt four-stroke engines reputation unlimited life Cabin interiors reader requests infor mation about cabin interior detail done beginning fuselage con struction after completion model answer little large doors hatches removable canopy permit easy access interior much detail can applied finished airplane openings small work needs done early fuselage construction fuselage having visible steel tubes Continued page 141 ggggg eSOOeOO OOOOOggOOOOO 0 & m aa hi S no vg o E3 80 El0 S 0 0 S 6 0 408 S -0~0-0000 00 0 no 0o 80 8- __ _ 00000 0OU C05 C88Z8n0 O~C9o00 S IUJEiII 0 0 SS 0 0 0 100000000000006600 5080~~80 O5.non5~ n F 0008g S a- F 5 E5S F V05 000000005 F 800 S z December 1985 137 00 F 58 -C8) RC Scale/Wischers Continued page 137 formed aluminum bulkheads parts built structure before ex ternal sheeting applied Tubes can represented wood dowels fastened ordinary model cement glue Aluminum tubes can also employed present problem fastening joints unless modeler adept brazing joints either wood aluminum must absolutely secure will loose parts rattling around side fuselage after first bad land ing best paint parts before covering fuselage exterior surfaces Civil aircraft types likely have smoothly-finished interior military planes will show open structure smooth interior balsa styrene sheets can built desired ef fect Keeping mind difficulty working through small openings fin ishing interior best apply paint work progresses rather try paint inside afterward nearly impossible spray inside cabin completed fuselage military types inner sur face covering material becomes cockpit wall canopy can made removable access cockpit Working through small cabin door worst possible situation Consider building access hatch fuselage bottom less conspicuous top hatch visible edges smooth surfaces should exist least desirable airplanes radio equipment has installed cockpit area compound problem making pre sentable interior Seats floors must somehow made removable servicing installation servos battery receiver recent models us ing Velcro hold seats floors example seat held four small scraps about / x 1 in size Velcro area too large balsa seat struc ture will come unglued abuse removal use smaller pieces light pull will extract seat yet held tight withstand accidental motion bad landing has never shaken loose seat planes dummy pilot can held place means seat belt shoulder harness made dressmakers ribbon ends anchored seat edges Velcro Other cabin details instrument panels control stick wheel upholstery usually installed last after model has painted before enclosing com pletely windows windshield canopy instrument panel requires some pre-planning because cases covers models fuel tank prefer fasten panel small wood screws permit removal access tank some time life model fuel tank may need servicing Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Aerobatics/Van Putte Continued page 49 has become difficult old article written almost nobody fiberglass fuselages foam wing still idea Ed Izzos head see Ed some us still remember Balsa structures easier repalr because new piece can cut put place crushed missing piece other hand never dreamed cyanoacrylate CyA adhesives fast-cure epoxies way back real challenges repair fiberglass fuselages damage Im talking about kind fuselage couple wrinkled big chunks rest lot little pieces As long fuselage reasonably intact two three large pieces theres good chance can repaired first part repair procedure very important fuselage must thoroughly cleaned repair will mechanically sound usually use K&B Superpoxy thinner because cleans up almost everything Alcohol lacquer thinner reasonable job good K&B thinner good way test trace oil see well piece masking tape will stick Masking tape wont stick very well theres minute trace oil surface Before starting actual repair its good idea stand back examine damage Sometimes job can made lot easier doing repair certain order Practicing fitting pieces together good procedure follow setting up sequence repair lot fuzzy edges along break wont join together well trim off leaving pieces can pushed together little no gap along break Try trim it. until thing fits well Look places key repair like stripes paint job make sure repair properly aligned tack-glue small sections CyA small steps between two pieces can use fingers inside outside fuselage align Once theyre aligned tack-glue too Work way around repair reducing distance between tack-glue points until everything glued back together pieces missing will filled later Sand inside fuselage side repaired area wipe fuselage inside out solvent get rid dust finger oils Put masking tape outside fuselage across repaired areas use pieces about five inches long Stick down end pull tight across break stick down other end before thoroughly smoothing December 1985 141 C 10 0 C 0 4- Cl 6 C ci 0 0 0 ci V 0 C\I x 00 x 0 -i 0 0 0 0 5 0 LL 1141z11
Edition: Model Aviation - 1985/12
Page Numbers: 46, 47, 136, 137, 141
Scale Bob Dolly Wischer CONTROL CABLES Control surface actuation cable commonly used Scale models aircraft have exposed cables Its notable advantage its light weight short lengths use models no stretch fore no loss motion using stain less steel cable intended operation Control Line models cable inex pensive found hobby shops flexible available various diameters suit model sizes Its main dis advantage cannot soldered Terminations must made swaging Other materials have also used such fish-line leaders plastics experience has slight amount stretch objectionable because motion lost loss varies airspeed have seen control cables fastened directly servo output arms basic fault arrangement im poses constant load servo bear ings lever length too short provide positive control neutralizing preference plywood lever pivoted its center cables fastened end short music wire pushrod connects lever servo output arm disc Lever length can long per mitted fuselage width widebodied models Emeraude example lever eight-in long really important factor cable system lever length distance between cable end pushrod attachment point lever control horn rudder eleva tor can scale length crosssectional size best appearance horn must very secure fastening rudder certain no lost motion also withstand considerable force line tension Once geometry control cable system understood advantages become apparent example control surface travel can altered shifting point lever music wire pushrod pivoted Ordinarily attach pushrod close possible cable attachment points using servo arm length provide desired control surface travel However lever made longer end pushrod pivot 46 Model Aviation Bill Kleinhans brought 93in.span Flesler Starch 85 Mint Julep contest Its Swensen kit uses silk doDe covering Supertigre 75 engIne Mike Wartmans Christen Eagle started Pilot kit Power 05 90 four-StrOke paint scheme entirely masked using acrylic lacquer over World-Tax fabric i-o~er u-vii scratch-built creation Ralph Jackson Power Webra Bully engine Span 80 weight 2075 lb used polyester covering material finished acrylic-lacquermasked frisket Including lozenge-pattern upper surfaces extreme tip long end will reduction control surface travel relative servo motion reverse also true lever having equal lengths side center servo linkage pushrod some point closer lever center controlsurface travel increased relative servo motion leverage advantages can handy whenever servos mounted odd positions often happens Scale models servos spaced close proximity long servo output arm cannot fitted interference levers airplanes made 1/8-in ply center hole drilled close running fit No 5 wood screw screw threaded anchoring block Cnntinupd ~gp Gary Underhills 82-ln-span Curtiss Condor L uses two HP 21 four-stroke engines weIghs 975 lb Sonic Systems air cylinders operate homemade retracts Tartan single powers Fokker EV R built Bob Hanft WW I-era /4scaler has machine gun sound effects during flight Covering material dacron organza CoveritelK&B epoxy Weighs 1875 lb spans 84 7 / Model Magic Epoxy Plus 8 mm 25% lighter Sands & carves like Basswood \ Non sagging gap filling super strength Use anywhere two part epoxy used B fi oz $895 retail equal 8 oz regular epoxy Model Magic Filler Balsa Foam & Fiberglasssands exactly like Balsa Super lightweight Superior adhesion Waterproof Nontoxic Use nicks gaps fillets fairings building up large areas8 fI oz $595 retail shrink turn brittle used gasoline fuel offers clarity visual fuel flow Model Magic - fuel tubing remains flexible plasticizer migration foul engines exhibits outstanding tear abrasion resistence Tubing tinted red easy identification gasoline & diesel use Available 5ff $249/pkg 1 Off $479Ipkg 50ff spools $21 90 Blue Gb-Fuel Tubing Made finest silicone tubing available Less 1% swelling after 150 hours % nitro fuel Available 2 5ff packages 50ff spools i C Inc ThModel Gas & Diesel Tubing Magic Gas & Diesel Fuel Tubing will swell fine products available dealer direct Magic Products PO Box 19784 St Paul MN 55119 715/425-1397 December 1985 47 rare 193Osera Rose Parakeet /3scale oy rat massey nas uperpoxy tinisfl over Koverall used two coats nontautening dope two coats regular butyrate Building repairs asnapwith Model Magic U ma u m N m m FOUR CYCLE ENGINE MOUNTS Cast oluminurn alloy Ground 90 thrust line Brigtrt polish finished Socket cap screws inCluded DRILLED AND TAPPED FOR No Jt-20 OS MAX PS 20600 No JT-4o Undnhled tar 21-40BOO No Jt-41 HPVT21 1000 No JT-42 ENVA 35-40 AC 1000 No JT-43 SAITO PA 30 tOOC NoJT-44 OSMAXPS4O 1000 No JT-45 SAITO PA 40-45 1000 No JT-46 ENA 46 AC 000 Na JT-49 HP VT 49 1200 No JT-60 Undnlled 501 60-901100 No JT-61 OS MAX FS 61 t3O0 No JT-62 Os MAX PS 6075-90t3D0 No JT-64 ESWYA 60-80-90-120 AC 1300 No JT-65 SAITO PA 65 1300 No JT-t20 Und6lled tor 120 t600 No JT-121 ENVA P 120 PC 1800 Na JE-t22 Os MAX PS 120 1800 Na JT -123 SAITO PA t20 800 No JT-125 Super hgre 25-3000 tB00 RC Soaring/Pruss Continued page 133 Pivot areas name impliesa pivoting wing wingerons coupled rudder plus elevator fuselage seamless fiberglass shell wood deck Its 36 inches long wing foam core spruce spars A2-in balsa sheeting Airfoil Eppler 387 Wingspan 60 inches design exceptionally clean no rubberbands screws exposed Micro servos 100-mA battery pack job internally room 225-mA battery pack bird towards sophisticated side kitting packaging quality throughout kit contains hardware pushrods necessary including pivoting wings Cost $6995 available direct-only Dodgson Designs 2904 SW Camano Dr Camano Island WA 98292 thought hand-launch birds boxy-looking very simple design no imagination toward aesthetics Pivot should dispel idea Jim Porter Iowa will help sup port Jim Porters two models Whisper II first has seen Midwest circlesand thermalsfor about last three years open framework fuselage makes design distinctive Controls ailerons elevator Wingspan 55 inches around Eppler 214 airfoil Allup weight 15 ounces can see construction built-up One-eighth-inch spruce longerons shape fuselage A-inch square balsa provides cross bracing contrast Whisper number II has all-sheeted pivoting wing Elevator other control As Whisper both servos mounted fuselage aedilable hobby shop ORDER DIRECT return UPS shIpment Joirir rororie ENGINE TESTING STANDS Steel restraining pins Cast Aluminum tar engine52k JT-Q3A QUADRA 35 Jt-Z34 ZENOAN G-3B IT-TD4 ALTEC ERD 2000 No OrSI JT152JI-QaB QUADRA 25 10 60Garrl sizeA 10 2 5JT-Q5B QUADRA 50 11 50 00JT-Z3B ZENOASI G-3B JT-M38 MAXI 30 2000 SIDE MOUNT MUFFLERS tar PUTS CAP 21 CESSNA 150 etc No JT-40 29-404h 60 1500 4591 12 EXHAUST EXTENSIONS NEOPS5NE JtMI2016 400JINSA , biA 350 JI M55 % 016455J5N38 50 JtNi2 75 78016 600JINOS 00 JtN3A 6 BrA550 GIANT ENGINE MUFFLERS Marched engine tail pipe extensions mounting bolts included Also available tar ATLAS 46 BULLY COBRA KAWASAKI KIORITZ SACH-DOMLER SUPER TIGRE 2500-3000 jt-Q3L QUADRA 35 Jt-Q5L QUADRA 50 Jt-Z3L ZENOAH G-3B JT-TDR ALTEC ERD JT-M3R MAXI 30 JT-Q3R QUADRA 35 JT-QSR QUADRA 50 JT-Z3R ZENOAH G-38 JT-M3L MAXI 30 JT-Q54 QUADRA 50 JT-M34 MAXI 30 2000 JT-Q SS QUADRA 50 JT-M35 MAXI 30 2000 MAIL ORDER Ptease add 250 tar UPS shipping Check MO VISA MC COD accepted Add 200 estra tar COD Calit residenTs add 6% tax -SEND FOR FREE CATALOGAirfoil again Eppler 214 span 61 inches unwritten weight-limit also bumped number II pushes 1TA ounces Well have fans Some thoughts ideas photos thinking small Its fact hand-launch unofficial category novel idea just whim local group fliers Its growing steadily since least 1977 andjudging letters club newslettersthere terest nationwide So maybe its time think-small category think-big con test unofficial event 1986 AMA Nationals event could run day after regular Soaring schedule Pre-registra tion could take place during regular events get idea would compete event could run competing unlike large club con test way regular task force workers wouldnt loaded down extra chores Tasks task could simple Let weather dictate Simple man-on-man five-minute max would help keep things flowing no winches concerned about group could ready box launch area ready fly soon previous groups transmitters clean Since would unofficial event entry fee could too no trophies available let small entry fee say buck two divided up prize money really could minimumhassle/maximum-fun event Think about pass thoughts way Well pass Good lift Dan Pruss 131 E Pennington Ln Plainfield IL 60544 responding advertisers mention read about ModelAviation RC Scale/Wischers Continued page 47 basswood pine lever will pivot freely block needs cemented securely fuselage centerline braced withstand tension cables time concerned about wear center hole also drilled holes cable attachment used short lengths brass tube bush ings plywood later airplanes bushings have omitted no detrimental effects plywood isnt worn away flight operations after years use rudder horn l/8-in-thick plywood average models would too heavy correct scale appearance Thinner plywood should have brass bushings epoxied place long life tube needs slightly longer horn thickness common Control Line sevenstrand wire size purposes 018 diameter 1/2-in length 062-in outside diameter aluminum tube flat tened slightly squeezing gently between wide jaws electricians pliers Unless flattened tube will accom modate two wires 018 diameter Thread length tube wire sert wire back through tube Slide tube toward lever shorten loop crimp tube tightly squeezing pliers larger airplanes have using 021 diameter wire two will fit within aluminum tube though has made oval squeez ing Rather use larger-size tube ream out 062-in tube No 63 037 No 62 038 diameter drill before changing its shape oval no need large gaping holes fuselage sides wires emerge After model completed painted 1 36 Model Aviation 2000 determine exact hole locations measurement drill use length %2-in music wire about two feet long ground sharp chisel point rotated electric hand drill hole started piercing fuselage side scriber music wire drill tip will wander mar finish Bits masking tape stuck fuselage side act aiming point combination rudder horn wire attachment holes direct music wire drill proper path drill aimed comes out very close end lever inside fuselage should happen bulkhead path drill its plywood drill will penetrate continue straight path course could have done previously during fuselage con struction rudder already hinged minor problem finding drilled hole covered finished fuselage afterward intent have no bends wire rudder horn lever no friction points along way spoil freely-operating system usual assembly sequence thread lengths wire through holes fasten crimp lever end loosely loop wires through rudder horn tubes Gradually tighten wire sliding through horn tube until rudder held its neutral position lever other end held right angles fuselage longitudinal axis done servo mounted place receiver transmitter turned maintain lever its true neutral position Use pliers pull wire ends placing equal tension wires sliding tube shorten loop before final crimping tubes connection extremely positive Concerned about effect steel wires close parallel receiver antenna Scale models since 1970 have antenna inside fuselage along wires has never range problem because using Kraft Royal Ace radios doubt check both ways antenna inside outside fuselage have found no difference Fiberglass cowls letter Jack Schwartz included some suggestions improvements method produc ing fiberglass cowls over foam cores described July 1985 column As last layer place fiberglass cloth Jack uses portion panty hose stretched over cowl form mounted end broomstick clamped vise panty hose pushed pulled stretched ends tied underneath After minute com plete stretch smooth resin ex trudes through panty hose weave us ing stick brush fingers what ever handy about 15 minutes dab off excess epoxy working front back cowl finished product surface requires no sanding Jack also has other methods using panty hose An entire fuselage can covered piece rear either fiberglass balsa sheeting over openwork structure open structure first uses three light coats nitrate dope fill pores cover ing After 48-hour cure time applies heat iron medium heat setting panty hose material pulls up tight drum large fuselages covering wings suggests buying queen-size jumbo-size panty hose definitions Jack says its tough called Panty Hose Kid age 71 Jack has fourdigit AMA number Four-stroke glow plugs Approximately 25 years ago appeared hobby market glow plug made makers Champion spark plugs labeled VG-2 same ad standard glow plug appearance closely resembled regular porcelaininsulated spark plug miniature familiar red lettering imprinted used until first glo bar plugs came along put aside better idling afforded newer glow plugs Someone suggested old Cham pion glow plugs well suited operation four-stroke engine searched through pile discarded engine parts found pair Champion plugs new condition Opera tion better expected extra 200 rpm top end extremely slow idle excellent transition OS Gemini twin 120 Champion plugs look exactly like spark plugs have asked countless occasions wheth er Gemini ignition standpoint Scale appearance great improvement over model Slow plugs small problem wrench fit plug body wont fit inside Gemini cooling fins its cylinder heads turned down standard six-ppint hex socket thinner walls provide clearance fins Find someone has modeling 25 years Beg bor row steal cast-off Champion glow plugs try four-stroke provided course isnt four-stroke engines reputation unlimited life Cabin interiors reader requests infor mation about cabin interior detail done beginning fuselage con struction after completion model answer little large doors hatches removable canopy permit easy access interior much detail can applied finished airplane openings small work needs done early fuselage construction fuselage having visible steel tubes Continued page 141 ggggg eSOOeOO OOOOOggOOOOO 0 & m aa hi S no vg o E3 80 El0 S 0 0 S 6 0 408 S -0~0-0000 00 0 no 0o 80 8- __ _ 00000 0OU C05 C88Z8n0 O~C9o00 S IUJEiII 0 0 SS 0 0 0 100000000000006600 5080~~80 O5.non5~ n F 0008g S a- F 5 E5S F V05 000000005 F 800 S z December 1985 137 00 F 58 -C8) RC Scale/Wischers Continued page 137 formed aluminum bulkheads parts built structure before ex ternal sheeting applied Tubes can represented wood dowels fastened ordinary model cement glue Aluminum tubes can also employed present problem fastening joints unless modeler adept brazing joints either wood aluminum must absolutely secure will loose parts rattling around side fuselage after first bad land ing best paint parts before covering fuselage exterior surfaces Civil aircraft types likely have smoothly-finished interior military planes will show open structure smooth interior balsa styrene sheets can built desired ef fect Keeping mind difficulty working through small openings fin ishing interior best apply paint work progresses rather try paint inside afterward nearly impossible spray inside cabin completed fuselage military types inner sur face covering material becomes cockpit wall canopy can made removable access cockpit Working through small cabin door worst possible situation Consider building access hatch fuselage bottom less conspicuous top hatch visible edges smooth surfaces should exist least desirable airplanes radio equipment has installed cockpit area compound problem making pre sentable interior Seats floors must somehow made removable servicing installation servos battery receiver recent models us ing Velcro hold seats floors example seat held four small scraps about / x 1 in size Velcro area too large balsa seat struc ture will come unglued abuse removal use smaller pieces light pull will extract seat yet held tight withstand accidental motion bad landing has never shaken loose seat planes dummy pilot can held place means seat belt shoulder harness made dressmakers ribbon ends anchored seat edges Velcro Other cabin details instrument panels control stick wheel upholstery usually installed last after model has painted before enclosing com pletely windows windshield canopy instrument panel requires some pre-planning because cases covers models fuel tank prefer fasten panel small wood screws permit removal access tank some time life model fuel tank may need servicing Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Aerobatics/Van Putte Continued page 49 has become difficult old article written almost nobody fiberglass fuselages foam wing still idea Ed Izzos head see Ed some us still remember Balsa structures easier repalr because new piece can cut put place crushed missing piece other hand never dreamed cyanoacrylate CyA adhesives fast-cure epoxies way back real challenges repair fiberglass fuselages damage Im talking about kind fuselage couple wrinkled big chunks rest lot little pieces As long fuselage reasonably intact two three large pieces theres good chance can repaired first part repair procedure very important fuselage must thoroughly cleaned repair will mechanically sound usually use K&B Superpoxy thinner because cleans up almost everything Alcohol lacquer thinner reasonable job good K&B thinner good way test trace oil see well piece masking tape will stick Masking tape wont stick very well theres minute trace oil surface Before starting actual repair its good idea stand back examine damage Sometimes job can made lot easier doing repair certain order Practicing fitting pieces together good procedure follow setting up sequence repair lot fuzzy edges along break wont join together well trim off leaving pieces can pushed together little no gap along break Try trim it. until thing fits well Look places key repair like stripes paint job make sure repair properly aligned tack-glue small sections CyA small steps between two pieces can use fingers inside outside fuselage align Once theyre aligned tack-glue too Work way around repair reducing distance between tack-glue points until everything glued back together pieces missing will filled later Sand inside fuselage side repaired area wipe fuselage inside out solvent get rid dust finger oils Put masking tape outside fuselage across repaired areas use pieces about five inches long Stick down end pull tight across break stick down other end before thoroughly smoothing December 1985 141 C 10 0 C 0 4- Cl 6 C ci 0 0 0 ci V 0 C\I x 00 x 0 -i 0 0 0 0 5 0 LL 1141z11