if realism plane performance turnsyou thenthe modified MidwestChamp isone betterexampies gas kltconversion partlcuiar fiight climb held angie shown maneuvering minimized Leisure 05 seven sub-Cs 361 reduction Rev-Up 11-7 shutoff 6 mm still climbing Using up-trim slight up-elevatorfor siow gilde fiightwaa oven 0mm ALTHOUGH RC ELECTRIC S wellestablished still believe such aircraft have fragile floatersor batteryladen bombs rocket-like climbs short runs Although good spec trum Electric kits offers everything aerobatics soaring Scale often view things can fly electric power Can electrify Falcon 56 World Engines Robinhood course Theoreti cally kit could fly electric motor power common sense tells us Pattern model would require struc tural redesign whereas light cabin sport model would perform well electric power almost comes out box naturals Gentle Lady Butterfly Monarch Piece OCake sure shots offer small challenge conversion However higher pow er-to-weight ratio glow-engine model higher its wing loading difficult convert example Gus Munich gets about five minutes aerobatic flying big Top Flite warbirds converts totally light open frameworks Bud Chappell gets same World Engines Robinhood virtually un touched open framing Naccaratos fly Sig -scale Cub electric power after expert lightening-up Actually unreasonable make easy weight savings wherever canwhich brings us Midwest Champion kits its category balk statements must so success weight ranges power must know 05-powered Electric does have weigh between 35 45 oz specs 15 glow-engine-powered cabin kit can made 10 minutes electric powera low-winger like Pronto may better does Midwest Champion break 10 minutes electric power can soar motor turned off light general lift Given 10-minute duration require ment pundits roughly 33% error maximum weight did modifr Champion kit during assembly ways anyone can duplicate balsa knife razor saw gross weight still 53 oz Two prime factors concern performance envelope Electric wing loading other amount energy available battery weight rela tion gross weight Forget motor weight except part gross 20% battery weight gross 53-oz plane Champion 13 oz wing loading soso excellent 25% Champ has 23% its gross weight motor battery relationship tested crazy variety plane sizes example tiny Ranger 42 Astro Super Ferrite 05075 six 12 Ah sub-C cells impossible gross of38 oz roughly 250 sq area giving wing loading 21 oz However ratio battery weight gross excellent 33% direct drive 7-4 prop would 6 min javelin heave got 8 mm wood 8-5 prop moderate toss Motor runs beyond 5 mm can see relationship motor run total time such heavyweight difference between LeCrate Champion comparable flight times 12 oz gross about square foot area 460 sq LeCrate 590 Champion both having identical wing loadings 13 oz LeCrate used six sub-Cs 2k-to-i reduction drive 1 1-7V Rev-Up prop Champion seven cells 36-to-i reduction 11-7 Rev-Up experiment dismal beginning wanted victim someone never 36 Model Aviation Note model has gone through several revision states expected cutaway drawing some photographs will complete agreement Some revisions occurred after cutaway developed /4 X I 3A65-IEET 1/16 WEBS FIVE RIBS OUT I/BSO VERTICAL BACKHG FOR BAlTERIES -630K FOR RUBR BANDS AROUND CELL RACK 36 TO REDUCliON 1/4 TRIANGLE CORNERS SEVEN SANYO 518 C BATTERIES SQUARE AIR EXHAUST R BOTtOM L G IMO HALVES FOR PLIGHT BATTERYTREXLER NO B 2 ENTER COULING AIR ALLYOU CAN L16PLNVIOUOCOREDISI WITH FOUR CUTOUTS BEARING ~rUBE I/4SOFT BALSA FILLDJT EACH SIDE LIGHT WEK3HT WHEELS EASILY BUILT seen electric motor built original design experience limited simplest glow-engine RCand someone minimal flying skills avenged myself kids Mike idea RC spread sheet sun watch Cox 049 Gentle Lady run out its tank flying skills tasked three-channel Ace Air Scout Midwest Champion both OS 15s During visit homestead ol man handed motor labeled Leisure words might like play suspected nothing Two months later letter said might modify Champ suggestion fell deaf ears Unknowntohim IhadputtheO5 Leisure Gentle Lady expecting ooze around small parkand devastated thing barreled frees Wipe outkeep secret UPS delivered surprise Midwest Champion kit needed guinea pig appealed brother Bob Patternflying nut Mach 1 Phoenix 6 etc flight tests Bob goes out fly does trees bent Elec tric Champ climbed several hundred feet almost overhead swooped around land after 3 mm proudly called ol man Terrible said Try again two months Bob got time up 4 5 5 mm ol man kept saying enough flying six sub-C cells swinging 1 1-7 prop 2-to-i reduction decided time call manufacturer help Roland Boucher September 1985 37 Mike Winter hoodwinked project before first test flight stage 2/21 reduction weighed 59 oz After lightening 53 oz going seven cells averaged 9 mm hopswere over 10 mm itdoes 12 1 3with weakthermal help Leisure sympathetic sent anew motor 36-to-i reduction said try seven cells 11-7 said motor damaged rear case rotated retarded timing setting getting 80% power away trip ol man Bob borrowed Champ did 815 950 high humidity day trees swaying flight made thermal assistance Champion weighed whopping 59 oz Vhen senior pilot left Virginia Champ trunk tore out servo rails changed World Engines Minis mounted servo tape took ounce tape off battery cells got rid six ounces Champ weighing 53 oz gross next flight went 13 mm 30 sec including short period soaring Bill On 815 flight Long Island motor run 5 minutesnormal six-cell LeCrate Mikes Cham pion 59 oz 5-min run resulted rather hot battery seven cells 36-to-i ratio subsequent flights made safe 4-mm run occasionally pushed 5 Later opened cooling passages air exits intake scoops After two seasons flying same battery pack found keeping extremely shallow climb angle minimizing control inputs motor still enough power climbing after 6-min run battery lukewarm afterwards called Roland Boucher said cells reach maximum efficiency just before begin go downhill foreverand such runs possible because learned properly fly given machine charge 14 16 volts per cell bit less peaking Incidentally 6-min-plus runs came after changed 3-in Trexler air wheels smallerthin Williams Brothers wheels cutaway drawing shows structural revisions some guidelines would convert other kits require brief oomment supplied Mike extra plan kit Midwest suggested revisions drawn red lines important alteration aerody namic Champion goes back mid-S Os manufactured Hal deBolt under DMECO name Americas popular single channel escapement trainer rudder ex haust baffle/venturi butterfly throttle earlier Live Wire 09 trainer 6-ft 19-powered Live Wire Senior 09 Rebel 15-powered Cub Champion book-alikes deBolt used consid erable angular difference stability set both wing stab positive angles incorporate downthrust effect reduced angular difference 50% re-sloping cabin top verge longitudinal instability less drag under power slow glide full up-trim some back stick puts wing higher L/D angle decreased incidence evident point performance envelope slow late final approach just before touching down holding some up attempt nose down get closer surface will dump lift rather hard landing done farther back final say 5 6 ft altitude strong wind momentary roller coaster effect may seen oonsider acceptable has happened twice three years producing fleeting correctable sur prise Its similar what enoounter holding off full-size J-3 Cub Champ after bounce landing premature relaxation up during recovery throttle also dumps lift can bust gear worse Mike red lines Big elongated lightening holes cut 3/32 sheet fuselage sides Aircraft ply replaced balsa Sig Lite Ply 3-in-wide cabin Gear tail dragger two torsion struts instead sheet metal trike gear option kit sheet skin stab removed leaving basic frame Lightening holes cut fin rudder elevators Only 1/16 sheet fuselage bottom Wing saddle timbers re duced cross section 3/16 x t Fulldepth sheet wing spar replaced 3/16 sq top bottom spars joined webbing D-tube sheeting could eliminated pars used MonoKote covering Rocket City strip nylon hinges extremely light needed slit X-Acto #11 blade material cut width hinge desired drop Hot Stuff side hinge halfafter insertionis strong wood fails try 38 Model Aviation Univ IflO SUDS11U11011 Dy S unuri iuruiun-wire gearand distinctive Electric-looking nose distinguish Its gas-powered brothers big wing has 590 sq area loading 1 31/i oz Also flies well direct drive Electric expertise maysupercharge power performance bigger motors Kit wing could used hardly penalty Leisure Astro motors can mount Lite Ply nose bulkhead means machine screws Both sides nose doubled Lite Ply having lightening holes cut pull out hinge pliers Bill Admittedly Midwest Cham pion example relatively easy conversion electric power However does suggest other possibilities What Champ offered assured suc cess beginners getting Electrics expertise wildering variety motors sizes battery combinationsor perhaps desire become overly involved have reader letter pictures electrified Evans Slow Motion inspired photos version just mentioned shown recent Just Fun column chap used Astro geared 05 10-8 prop Although weight 5-ft plane impossible 64 oz puts 6-mm flights aerobatics within first 12 flights thermalled motor shut down weight way 19 oz universally-recommended maximum gross Also Bill Evans getting 9 min utes aerobatics direct-drive Astro 25 Combalt Pick tail dragger possible third wheel its mechanics strut significant weight penalty already have electric motor system choose subject size wing area suits dont already have system 05-size motor offers wide selection nicely-sized planes extraordinari ly-wide spectrum things work well especially choice direct drive available gear ratio reduction drives consequently propeller sizes Good 05 models have flown areas ranging 250 725 sq incredible variation suggest area Continued page 40 Left Nose bottom removable hatch lip-tab rear small screw ply tab front 250 mAh flight battery servo-taped mid-point hatch trimming Original wheels shown switched Trexier small Williams finally homemade fat wheels detracted flight times RIght Sullivan inner rods extend almost devises horn provide minimum metal attachments tail wheel vanished cutting down gross weight present flying weight expertise sky limit May suggest game plan prefer reasonably long flights possibly occasional thermal assist ance can shut down extend duration look traditionally-stable types low structural densitywhich usually means open framework generous wing area although light sheet sides lightweight foam wings beyond pale example Champion weighs exactly same 5-ft Evans Slow Motion has all-sheet fuse lage low engine heavy Du-Bro wheels foam wing sheet balsa skin false cap strips open skinning gas model carries four-channel standard receiver 450 mAh flight pack September 1985 39 Only countershaft geared motor projects through bulkhead Blocks nose shape glued later Top corners soft V4xl/2 balsa top sheeting tween soft 3/16 Soft 3/32 sheeting used rounding off top nose Bent shafts problem Hardwood block neath shaft extension has close fit help resist shaft bending Cooling holes al ready poked intothe original bulk head afterwards air scoops exits added 11-8 narrow-blade Zinger prop shown bit much battery Interesting comparison Champ left has almost 1 sq ft area compared Winters LeCrate weighs 11-12 oz moregiving identical loadings LeCrate has six cells 21/21 reduction glides bit better Gas conversions ball park CORBEN SU 4 ACE MFG OF NI-STARTER N I-STARTER revoluti model engines used boats cars airplanes NI STARTERITMI uses HeadlocIsITMI adapter locks onto glow plugs start engine Fits pocket comes Gilt charger has LED lights up charging Rechargeable hundreds times gives over 50 consecutine starts recharging Available charger Send ad along prepayment receive free shipping handling NI-STARTER$2495 chgrger 1 0V 220V t2V fast chargerl NI-STARTER$1 595 chgrger Chgrgers$1295 chgrger flly tOV 220V t2V fast chargerl PLEASE SPECIFY WHICH CHARGER WHEN ORDERING 1/48 SCALE MODEL KIT DEPT MA 92069 $2495 Charger 12421 RANSOM DRIVE GLENN DALE MD 20769301 464-2260 Winning Ideas FOURMOST 0$ RETRACTABLE TOW HOOK RELEASE Price S690 V mn lest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight /a oz 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE $300 40 AIRFLO ENGINE MOUNT IDEAL FOR QUICKY 500 -i Cr PRICE $630 OTHER FOURMOST PRODUCTS Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming 450 500 sq 05 duration such plane sure well either direct drive available gear ratios general smaller go likely direct drive small prop high rpm will necessary con versely larger go likely need reduction drives big pro pellers Again what shooting minimum wing loading highest possible percentage battery weight gross weight choice subject its structural design determine amount rework needed bring ship within such reasonable parameters What rework talking about Consider flight loads usually far less fast aerobatic glow-engine models people can tear wing off 40-powered gas model may have double triple wing loadings will working Electric such structures extreme over kill Dont think Electric fragileso dont beef up No orgies heavy ply big blocks please have seen open-frame Electrics cartwheel pavement re ceive superficial damageand know gassies have seen destroyed cartwheeling Most kits gas engines have sheet sides Change t 3/32 3/32 1/16 use lightweight balsa Cut big light ening holes sides Bulky structural members crosspieces can always reduced size Awing runner rail rd boot can replaced medi um 3/16 x Bulkhead cutouts can enlarged perhaps leaving -or -in-wide vertical area side mere 3/32 sq across bulkhead top bottom prevents splitting Re place big corner triangle blocks 2 1/16 sq running strips Throw out aircraft plywood parts replace Lite Ply just balsa instances -in aircraft ply firewall can Hollow blocks replace sheet construction Lite Ply landing gear sup port front cabin bulkhead suffices Gussets can smaller and/or thinner No epoxy Cyanoacrylate glues ideal Top bottom fuselage sheeting 05size models can 1/16 Run top bottom grains 450 way top opposite bottom straight-across grain easily splits no matter what type model used large weight reduction possible wings youre planning aerobatics violent control movements sq spar can reduced 3/16 3/32 rib 1/16 although long ribs may need 1/16 x 3/16 cap strips instances leading edge sheeting needed kits size electric power used Trailing edges can narrowed kits use timers use spar webs over-and-under spars 1/16 sheet suffices Spar joiners gas models sinners being 3/3 2 inued page 42 40 Model Aviation NEW First planned series 1/48 scale aircraft models 1935 Corben Super-Ace single-seat sportplane powered Ford Model engine KIT FEATURES INJECTION-MOLDED PARTS COMPREHENSIVE INSTRUCTIONS MONOFILAMENT RIGGING DECALS FOR MARKINGS GOLDEN AGE SERIES SEND $1 FOR COMPLETE CATALOG 181 PAWNEE STREET SAN MARCOS CALIFORNIA nd SASE Complete Information Fjunuvjoi 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 * PLANS * TARB oby cially Turn-around thIs 850 sq in. 120 5 cycle ~$119S powered Ron Chidgey design smooth solid performer Rib templates computer plotted Plans construction hints TIGER TAIL LI Ron Chldgeys latest bast series little larger lighter slower ratains honest flight characteristics its predecess ors Plans construction hints WELLER 3 BLADE FIBERGLASS PROP Proven Nats Interna tional competition 10 x 7-315 $2000 IVANS MAGIC GADGET protractor device used Ivan Itriatensen accurately measure aileron elevator ar1 rudder throw Takes guess work Out trimming out airplane quality tool complete Instructions log book carrying case $795 SEE YOUR DEALER OR ORDER DIRECT sic PsetoesAsce 0*55 L*UscEO CuneRs Psoa LiCTaEiAHT ALorsua eevke*AE C*55 550 FULL SIZE pArreess Issue coUld iLLAsreArCo PACaicAriOs *50 PLVi5C ssreucrros5 S. 05 A5OITIAs*L PATTE555 $125 SACS 05 SIX PACK Pick Ca 5Cmas n. 515Cm WING TUBE & SOCKETS ii 4w Aluminum alloy tubing plug-In wings included peir special slipfit phenolic sockets build wing structure Now sIte models 7/8 dia x 2 5 1$ dia x 2 5 1$ dia x 3 5 ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage new 60s 17MM rca bearing Both $795for $69595 TRANSMITTER ..SE An inexpensive rugged molded case protect expensve transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1695 Gatr PJC Pro 3713 PoMpano DrIve P Penmacola FL 32514 Phone 904 4768639 INCLUDE SIW PER ITEM POR UPS TURN ~MALU WITH THE THERMAL MIXER \7 UsFrwn 423871 # Add 0 302 climbing Tate 1 Sip ttaSCbt fl5 biSSise 0 tbrinS 05 sha 555 mnfa.aaa pafihi rSeam saSs salteisa. Wiphs lj Cs TSimIs S 3900 c.M KS 5dd*eo HIGH SKY 3929 KANSAS St9 SAN DIEGO CA 92104 42 Model Aviation 14-jn ply 1/32 ply enough deep joiner full-depth joiner suf ficient using corner gussets dihedral joint leading trailing edges probably can get joiner three four model Midwest Champion size 3/16 sq over-and-under spars replace ail surfaces sheet balsa tough keep light enough Sheet tails beyond -in thickness will weigh ton light ening holes 05-size model -inthick leading edge spar strips open-frame surface can bit flimsy Diagonal crosspieces dont afraid change straight ones add rigidity Champ has dges ar important select good straight grained lightweight wood hereand eve rywhere else may have substitute what find kit Another idea sheet balsa tail surfaces butt-join two soft lightweight pieces spanwise front piece has grain running diagonally rear piece latter taking spar loads Add leading edge strip medium balsa added strength oontrol surfaces large use open construction Otherwise use soft sheet balsa lightening holes 3/16-in thick -in-thick stab Normal epoxied hinges too heavy use strip hinges previously suggested use balsa pushrods 3/16 sq sufficient dont need nless plane rather large and/or heavy used 3/16 sq LeCrate did Don Srull big Sparky Mini mize lengths 1/16 wire extensions take devises Plastic flexible pushrods fine Champ has smallersize Sullivan rods smaller lighter receiver servos better off youll Any smaller four-channel receivers fine mini receiver nice essential Use smallest-possible servosminis can spring dont need rails servo tape works fine radio battery pack need 450 mAh Ive experienced no limitations 250 mAk packs have battery cycler smart occasionally check remaining time after flying session discard pack after cycling full charge reveals maximum capacity loss 20% dont aerobatics Champ except rare fun loop shallow dive pull-up followed snap roll Since servos worked heavily such flying five flights safe 250 mAh pack provided long thermalling periods encountered dont need power controller throttle type plane way fly servo-driven microswitch on/off quite satisfactory converted Midwest Champion gan sluggish ugly duckling proved itself pleasant performer almost countless flying sessions Theres sorts stuff like out have ball suppose theres angel among used plans have filed away RC VIDEO MAGAZINE PEENTS --
Edition: Model Aviation - 1985/09
Page Numbers: 36, 37, 38, 39, 40, 42
if realism plane performance turnsyou thenthe modified MidwestChamp isone betterexampies gas kltconversion partlcuiar fiight climb held angie shown maneuvering minimized Leisure 05 seven sub-Cs 361 reduction Rev-Up 11-7 shutoff 6 mm still climbing Using up-trim slight up-elevatorfor siow gilde fiightwaa oven 0mm ALTHOUGH RC ELECTRIC S wellestablished still believe such aircraft have fragile floatersor batteryladen bombs rocket-like climbs short runs Although good spec trum Electric kits offers everything aerobatics soaring Scale often view things can fly electric power Can electrify Falcon 56 World Engines Robinhood course Theoreti cally kit could fly electric motor power common sense tells us Pattern model would require struc tural redesign whereas light cabin sport model would perform well electric power almost comes out box naturals Gentle Lady Butterfly Monarch Piece OCake sure shots offer small challenge conversion However higher pow er-to-weight ratio glow-engine model higher its wing loading difficult convert example Gus Munich gets about five minutes aerobatic flying big Top Flite warbirds converts totally light open frameworks Bud Chappell gets same World Engines Robinhood virtually un touched open framing Naccaratos fly Sig -scale Cub electric power after expert lightening-up Actually unreasonable make easy weight savings wherever canwhich brings us Midwest Champion kits its category balk statements must so success weight ranges power must know 05-powered Electric does have weigh between 35 45 oz specs 15 glow-engine-powered cabin kit can made 10 minutes electric powera low-winger like Pronto may better does Midwest Champion break 10 minutes electric power can soar motor turned off light general lift Given 10-minute duration require ment pundits roughly 33% error maximum weight did modifr Champion kit during assembly ways anyone can duplicate balsa knife razor saw gross weight still 53 oz Two prime factors concern performance envelope Electric wing loading other amount energy available battery weight rela tion gross weight Forget motor weight except part gross 20% battery weight gross 53-oz plane Champion 13 oz wing loading soso excellent 25% Champ has 23% its gross weight motor battery relationship tested crazy variety plane sizes example tiny Ranger 42 Astro Super Ferrite 05075 six 12 Ah sub-C cells impossible gross of38 oz roughly 250 sq area giving wing loading 21 oz However ratio battery weight gross excellent 33% direct drive 7-4 prop would 6 min javelin heave got 8 mm wood 8-5 prop moderate toss Motor runs beyond 5 mm can see relationship motor run total time such heavyweight difference between LeCrate Champion comparable flight times 12 oz gross about square foot area 460 sq LeCrate 590 Champion both having identical wing loadings 13 oz LeCrate used six sub-Cs 2k-to-i reduction drive 1 1-7V Rev-Up prop Champion seven cells 36-to-i reduction 11-7 Rev-Up experiment dismal beginning wanted victim someone never 36 Model Aviation Note model has gone through several revision states expected cutaway drawing some photographs will complete agreement Some revisions occurred after cutaway developed /4 X I 3A65-IEET 1/16 WEBS FIVE RIBS OUT I/BSO VERTICAL BACKHG FOR BAlTERIES -630K FOR RUBR BANDS AROUND CELL RACK 36 TO REDUCliON 1/4 TRIANGLE CORNERS SEVEN SANYO 518 C BATTERIES SQUARE AIR EXHAUST R BOTtOM L G IMO HALVES FOR PLIGHT BATTERYTREXLER NO B 2 ENTER COULING AIR ALLYOU CAN L16PLNVIOUOCOREDISI WITH FOUR CUTOUTS BEARING ~rUBE I/4SOFT BALSA FILLDJT EACH SIDE LIGHT WEK3HT WHEELS EASILY BUILT seen electric motor built original design experience limited simplest glow-engine RCand someone minimal flying skills avenged myself kids Mike idea RC spread sheet sun watch Cox 049 Gentle Lady run out its tank flying skills tasked three-channel Ace Air Scout Midwest Champion both OS 15s During visit homestead ol man handed motor labeled Leisure words might like play suspected nothing Two months later letter said might modify Champ suggestion fell deaf ears Unknowntohim IhadputtheO5 Leisure Gentle Lady expecting ooze around small parkand devastated thing barreled frees Wipe outkeep secret UPS delivered surprise Midwest Champion kit needed guinea pig appealed brother Bob Patternflying nut Mach 1 Phoenix 6 etc flight tests Bob goes out fly does trees bent Elec tric Champ climbed several hundred feet almost overhead swooped around land after 3 mm proudly called ol man Terrible said Try again two months Bob got time up 4 5 5 mm ol man kept saying enough flying six sub-C cells swinging 1 1-7 prop 2-to-i reduction decided time call manufacturer help Roland Boucher September 1985 37 Mike Winter hoodwinked project before first test flight stage 2/21 reduction weighed 59 oz After lightening 53 oz going seven cells averaged 9 mm hopswere over 10 mm itdoes 12 1 3with weakthermal help Leisure sympathetic sent anew motor 36-to-i reduction said try seven cells 11-7 said motor damaged rear case rotated retarded timing setting getting 80% power away trip ol man Bob borrowed Champ did 815 950 high humidity day trees swaying flight made thermal assistance Champion weighed whopping 59 oz Vhen senior pilot left Virginia Champ trunk tore out servo rails changed World Engines Minis mounted servo tape took ounce tape off battery cells got rid six ounces Champ weighing 53 oz gross next flight went 13 mm 30 sec including short period soaring Bill On 815 flight Long Island motor run 5 minutesnormal six-cell LeCrate Mikes Cham pion 59 oz 5-min run resulted rather hot battery seven cells 36-to-i ratio subsequent flights made safe 4-mm run occasionally pushed 5 Later opened cooling passages air exits intake scoops After two seasons flying same battery pack found keeping extremely shallow climb angle minimizing control inputs motor still enough power climbing after 6-min run battery lukewarm afterwards called Roland Boucher said cells reach maximum efficiency just before begin go downhill foreverand such runs possible because learned properly fly given machine charge 14 16 volts per cell bit less peaking Incidentally 6-min-plus runs came after changed 3-in Trexler air wheels smallerthin Williams Brothers wheels cutaway drawing shows structural revisions some guidelines would convert other kits require brief oomment supplied Mike extra plan kit Midwest suggested revisions drawn red lines important alteration aerody namic Champion goes back mid-S Os manufactured Hal deBolt under DMECO name Americas popular single channel escapement trainer rudder ex haust baffle/venturi butterfly throttle earlier Live Wire 09 trainer 6-ft 19-powered Live Wire Senior 09 Rebel 15-powered Cub Champion book-alikes deBolt used consid erable angular difference stability set both wing stab positive angles incorporate downthrust effect reduced angular difference 50% re-sloping cabin top verge longitudinal instability less drag under power slow glide full up-trim some back stick puts wing higher L/D angle decreased incidence evident point performance envelope slow late final approach just before touching down holding some up attempt nose down get closer surface will dump lift rather hard landing done farther back final say 5 6 ft altitude strong wind momentary roller coaster effect may seen oonsider acceptable has happened twice three years producing fleeting correctable sur prise Its similar what enoounter holding off full-size J-3 Cub Champ after bounce landing premature relaxation up during recovery throttle also dumps lift can bust gear worse Mike red lines Big elongated lightening holes cut 3/32 sheet fuselage sides Aircraft ply replaced balsa Sig Lite Ply 3-in-wide cabin Gear tail dragger two torsion struts instead sheet metal trike gear option kit sheet skin stab removed leaving basic frame Lightening holes cut fin rudder elevators Only 1/16 sheet fuselage bottom Wing saddle timbers re duced cross section 3/16 x t Fulldepth sheet wing spar replaced 3/16 sq top bottom spars joined webbing D-tube sheeting could eliminated pars used MonoKote covering Rocket City strip nylon hinges extremely light needed slit X-Acto #11 blade material cut width hinge desired drop Hot Stuff side hinge halfafter insertionis strong wood fails try 38 Model Aviation Univ IflO SUDS11U11011 Dy S unuri iuruiun-wire gearand distinctive Electric-looking nose distinguish Its gas-powered brothers big wing has 590 sq area loading 1 31/i oz Also flies well direct drive Electric expertise maysupercharge power performance bigger motors Kit wing could used hardly penalty Leisure Astro motors can mount Lite Ply nose bulkhead means machine screws Both sides nose doubled Lite Ply having lightening holes cut pull out hinge pliers Bill Admittedly Midwest Cham pion example relatively easy conversion electric power However does suggest other possibilities What Champ offered assured suc cess beginners getting Electrics expertise wildering variety motors sizes battery combinationsor perhaps desire become overly involved have reader letter pictures electrified Evans Slow Motion inspired photos version just mentioned shown recent Just Fun column chap used Astro geared 05 10-8 prop Although weight 5-ft plane impossible 64 oz puts 6-mm flights aerobatics within first 12 flights thermalled motor shut down weight way 19 oz universally-recommended maximum gross Also Bill Evans getting 9 min utes aerobatics direct-drive Astro 25 Combalt Pick tail dragger possible third wheel its mechanics strut significant weight penalty already have electric motor system choose subject size wing area suits dont already have system 05-size motor offers wide selection nicely-sized planes extraordinari ly-wide spectrum things work well especially choice direct drive available gear ratio reduction drives consequently propeller sizes Good 05 models have flown areas ranging 250 725 sq incredible variation suggest area Continued page 40 Left Nose bottom removable hatch lip-tab rear small screw ply tab front 250 mAh flight battery servo-taped mid-point hatch trimming Original wheels shown switched Trexier small Williams finally homemade fat wheels detracted flight times RIght Sullivan inner rods extend almost devises horn provide minimum metal attachments tail wheel vanished cutting down gross weight present flying weight expertise sky limit May suggest game plan prefer reasonably long flights possibly occasional thermal assist ance can shut down extend duration look traditionally-stable types low structural densitywhich usually means open framework generous wing area although light sheet sides lightweight foam wings beyond pale example Champion weighs exactly same 5-ft Evans Slow Motion has all-sheet fuse lage low engine heavy Du-Bro wheels foam wing sheet balsa skin false cap strips open skinning gas model carries four-channel standard receiver 450 mAh flight pack September 1985 39 Only countershaft geared motor projects through bulkhead Blocks nose shape glued later Top corners soft V4xl/2 balsa top sheeting tween soft 3/16 Soft 3/32 sheeting used rounding off top nose Bent shafts problem Hardwood block neath shaft extension has close fit help resist shaft bending Cooling holes al ready poked intothe original bulk head afterwards air scoops exits added 11-8 narrow-blade Zinger prop shown bit much battery Interesting comparison Champ left has almost 1 sq ft area compared Winters LeCrate weighs 11-12 oz moregiving identical loadings LeCrate has six cells 21/21 reduction glides bit better Gas conversions ball park CORBEN SU 4 ACE MFG OF NI-STARTER N I-STARTER revoluti model engines used boats cars airplanes NI STARTERITMI uses HeadlocIsITMI adapter locks onto glow plugs start engine Fits pocket comes Gilt charger has LED lights up charging Rechargeable hundreds times gives over 50 consecutine starts recharging Available charger Send ad along prepayment receive free shipping handling NI-STARTER$2495 chgrger 1 0V 220V t2V fast chargerl NI-STARTER$1 595 chgrger Chgrgers$1295 chgrger flly tOV 220V t2V fast chargerl PLEASE SPECIFY WHICH CHARGER WHEN ORDERING 1/48 SCALE MODEL KIT DEPT MA 92069 $2495 Charger 12421 RANSOM DRIVE GLENN DALE MD 20769301 464-2260 Winning Ideas FOURMOST 0$ RETRACTABLE TOW HOOK RELEASE Price S690 V mn lest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight /a oz 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE $300 40 AIRFLO ENGINE MOUNT IDEAL FOR QUICKY 500 -i Cr PRICE $630 OTHER FOURMOST PRODUCTS Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming 450 500 sq 05 duration such plane sure well either direct drive available gear ratios general smaller go likely direct drive small prop high rpm will necessary con versely larger go likely need reduction drives big pro pellers Again what shooting minimum wing loading highest possible percentage battery weight gross weight choice subject its structural design determine amount rework needed bring ship within such reasonable parameters What rework talking about Consider flight loads usually far less fast aerobatic glow-engine models people can tear wing off 40-powered gas model may have double triple wing loadings will working Electric such structures extreme over kill Dont think Electric fragileso dont beef up No orgies heavy ply big blocks please have seen open-frame Electrics cartwheel pavement re ceive superficial damageand know gassies have seen destroyed cartwheeling Most kits gas engines have sheet sides Change t 3/32 3/32 1/16 use lightweight balsa Cut big light ening holes sides Bulky structural members crosspieces can always reduced size Awing runner rail rd boot can replaced medi um 3/16 x Bulkhead cutouts can enlarged perhaps leaving -or -in-wide vertical area side mere 3/32 sq across bulkhead top bottom prevents splitting Re place big corner triangle blocks 2 1/16 sq running strips Throw out aircraft plywood parts replace Lite Ply just balsa instances -in aircraft ply firewall can Hollow blocks replace sheet construction Lite Ply landing gear sup port front cabin bulkhead suffices Gussets can smaller and/or thinner No epoxy Cyanoacrylate glues ideal Top bottom fuselage sheeting 05size models can 1/16 Run top bottom grains 450 way top opposite bottom straight-across grain easily splits no matter what type model used large weight reduction possible wings youre planning aerobatics violent control movements sq spar can reduced 3/16 3/32 rib 1/16 although long ribs may need 1/16 x 3/16 cap strips instances leading edge sheeting needed kits size electric power used Trailing edges can narrowed kits use timers use spar webs over-and-under spars 1/16 sheet suffices Spar joiners gas models sinners being 3/3 2 inued page 42 40 Model Aviation NEW First planned series 1/48 scale aircraft models 1935 Corben Super-Ace single-seat sportplane powered Ford Model engine KIT FEATURES INJECTION-MOLDED PARTS COMPREHENSIVE INSTRUCTIONS MONOFILAMENT RIGGING DECALS FOR MARKINGS GOLDEN AGE SERIES SEND $1 FOR COMPLETE CATALOG 181 PAWNEE STREET SAN MARCOS CALIFORNIA nd SASE Complete Information Fjunuvjoi 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 * PLANS * TARB oby cially Turn-around thIs 850 sq in. 120 5 cycle ~$119S powered Ron Chidgey design smooth solid performer Rib templates computer plotted Plans construction hints TIGER TAIL LI Ron Chldgeys latest bast series little larger lighter slower ratains honest flight characteristics its predecess ors Plans construction hints WELLER 3 BLADE FIBERGLASS PROP Proven Nats Interna tional competition 10 x 7-315 $2000 IVANS MAGIC GADGET protractor device used Ivan Itriatensen accurately measure aileron elevator ar1 rudder throw Takes guess work Out trimming out airplane quality tool complete Instructions log book carrying case $795 SEE YOUR DEALER OR ORDER DIRECT sic PsetoesAsce 0*55 L*UscEO CuneRs Psoa LiCTaEiAHT ALorsua eevke*AE C*55 550 FULL SIZE pArreess Issue coUld iLLAsreArCo PACaicAriOs *50 PLVi5C ssreucrros5 S. 05 A5OITIAs*L PATTE555 $125 SACS 05 SIX PACK Pick Ca 5Cmas n. 515Cm WING TUBE & SOCKETS ii 4w Aluminum alloy tubing plug-In wings included peir special slipfit phenolic sockets build wing structure Now sIte models 7/8 dia x 2 5 1$ dia x 2 5 1$ dia x 3 5 ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage new 60s 17MM rca bearing Both $795for $69595 TRANSMITTER ..SE An inexpensive rugged molded case protect expensve transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1695 Gatr PJC Pro 3713 PoMpano DrIve P Penmacola FL 32514 Phone 904 4768639 INCLUDE SIW PER ITEM POR UPS TURN ~MALU WITH THE THERMAL MIXER \7 UsFrwn 423871 # Add 0 302 climbing Tate 1 Sip ttaSCbt fl5 biSSise 0 tbrinS 05 sha 555 mnfa.aaa pafihi rSeam saSs salteisa. Wiphs lj Cs TSimIs S 3900 c.M KS 5dd*eo HIGH SKY 3929 KANSAS St9 SAN DIEGO CA 92104 42 Model Aviation 14-jn ply 1/32 ply enough deep joiner full-depth joiner suf ficient using corner gussets dihedral joint leading trailing edges probably can get joiner three four model Midwest Champion size 3/16 sq over-and-under spars replace ail surfaces sheet balsa tough keep light enough Sheet tails beyond -in thickness will weigh ton light ening holes 05-size model -inthick leading edge spar strips open-frame surface can bit flimsy Diagonal crosspieces dont afraid change straight ones add rigidity Champ has dges ar important select good straight grained lightweight wood hereand eve rywhere else may have substitute what find kit Another idea sheet balsa tail surfaces butt-join two soft lightweight pieces spanwise front piece has grain running diagonally rear piece latter taking spar loads Add leading edge strip medium balsa added strength oontrol surfaces large use open construction Otherwise use soft sheet balsa lightening holes 3/16-in thick -in-thick stab Normal epoxied hinges too heavy use strip hinges previously suggested use balsa pushrods 3/16 sq sufficient dont need nless plane rather large and/or heavy used 3/16 sq LeCrate did Don Srull big Sparky Mini mize lengths 1/16 wire extensions take devises Plastic flexible pushrods fine Champ has smallersize Sullivan rods smaller lighter receiver servos better off youll Any smaller four-channel receivers fine mini receiver nice essential Use smallest-possible servosminis can spring dont need rails servo tape works fine radio battery pack need 450 mAh Ive experienced no limitations 250 mAk packs have battery cycler smart occasionally check remaining time after flying session discard pack after cycling full charge reveals maximum capacity loss 20% dont aerobatics Champ except rare fun loop shallow dive pull-up followed snap roll Since servos worked heavily such flying five flights safe 250 mAh pack provided long thermalling periods encountered dont need power controller throttle type plane way fly servo-driven microswitch on/off quite satisfactory converted Midwest Champion gan sluggish ugly duckling proved itself pleasant performer almost countless flying sessions Theres sorts stuff like out have ball suppose theres angel among used plans have filed away RC VIDEO MAGAZINE PEENTS --
Edition: Model Aviation - 1985/09
Page Numbers: 36, 37, 38, 39, 40, 42
if realism plane performance turnsyou thenthe modified MidwestChamp isone betterexampies gas kltconversion partlcuiar fiight climb held angie shown maneuvering minimized Leisure 05 seven sub-Cs 361 reduction Rev-Up 11-7 shutoff 6 mm still climbing Using up-trim slight up-elevatorfor siow gilde fiightwaa oven 0mm ALTHOUGH RC ELECTRIC S wellestablished still believe such aircraft have fragile floatersor batteryladen bombs rocket-like climbs short runs Although good spec trum Electric kits offers everything aerobatics soaring Scale often view things can fly electric power Can electrify Falcon 56 World Engines Robinhood course Theoreti cally kit could fly electric motor power common sense tells us Pattern model would require struc tural redesign whereas light cabin sport model would perform well electric power almost comes out box naturals Gentle Lady Butterfly Monarch Piece OCake sure shots offer small challenge conversion However higher pow er-to-weight ratio glow-engine model higher its wing loading difficult convert example Gus Munich gets about five minutes aerobatic flying big Top Flite warbirds converts totally light open frameworks Bud Chappell gets same World Engines Robinhood virtually un touched open framing Naccaratos fly Sig -scale Cub electric power after expert lightening-up Actually unreasonable make easy weight savings wherever canwhich brings us Midwest Champion kits its category balk statements must so success weight ranges power must know 05-powered Electric does have weigh between 35 45 oz specs 15 glow-engine-powered cabin kit can made 10 minutes electric powera low-winger like Pronto may better does Midwest Champion break 10 minutes electric power can soar motor turned off light general lift Given 10-minute duration require ment pundits roughly 33% error maximum weight did modifr Champion kit during assembly ways anyone can duplicate balsa knife razor saw gross weight still 53 oz Two prime factors concern performance envelope Electric wing loading other amount energy available battery weight rela tion gross weight Forget motor weight except part gross 20% battery weight gross 53-oz plane Champion 13 oz wing loading soso excellent 25% Champ has 23% its gross weight motor battery relationship tested crazy variety plane sizes example tiny Ranger 42 Astro Super Ferrite 05075 six 12 Ah sub-C cells impossible gross of38 oz roughly 250 sq area giving wing loading 21 oz However ratio battery weight gross excellent 33% direct drive 7-4 prop would 6 min javelin heave got 8 mm wood 8-5 prop moderate toss Motor runs beyond 5 mm can see relationship motor run total time such heavyweight difference between LeCrate Champion comparable flight times 12 oz gross about square foot area 460 sq LeCrate 590 Champion both having identical wing loadings 13 oz LeCrate used six sub-Cs 2k-to-i reduction drive 1 1-7V Rev-Up prop Champion seven cells 36-to-i reduction 11-7 Rev-Up experiment dismal beginning wanted victim someone never 36 Model Aviation Note model has gone through several revision states expected cutaway drawing some photographs will complete agreement Some revisions occurred after cutaway developed /4 X I 3A65-IEET 1/16 WEBS FIVE RIBS OUT I/BSO VERTICAL BACKHG FOR BAlTERIES -630K FOR RUBR BANDS AROUND CELL RACK 36 TO REDUCliON 1/4 TRIANGLE CORNERS SEVEN SANYO 518 C BATTERIES SQUARE AIR EXHAUST R BOTtOM L G IMO HALVES FOR PLIGHT BATTERYTREXLER NO B 2 ENTER COULING AIR ALLYOU CAN L16PLNVIOUOCOREDISI WITH FOUR CUTOUTS BEARING ~rUBE I/4SOFT BALSA FILLDJT EACH SIDE LIGHT WEK3HT WHEELS EASILY BUILT seen electric motor built original design experience limited simplest glow-engine RCand someone minimal flying skills avenged myself kids Mike idea RC spread sheet sun watch Cox 049 Gentle Lady run out its tank flying skills tasked three-channel Ace Air Scout Midwest Champion both OS 15s During visit homestead ol man handed motor labeled Leisure words might like play suspected nothing Two months later letter said might modify Champ suggestion fell deaf ears Unknowntohim IhadputtheO5 Leisure Gentle Lady expecting ooze around small parkand devastated thing barreled frees Wipe outkeep secret UPS delivered surprise Midwest Champion kit needed guinea pig appealed brother Bob Patternflying nut Mach 1 Phoenix 6 etc flight tests Bob goes out fly does trees bent Elec tric Champ climbed several hundred feet almost overhead swooped around land after 3 mm proudly called ol man Terrible said Try again two months Bob got time up 4 5 5 mm ol man kept saying enough flying six sub-C cells swinging 1 1-7 prop 2-to-i reduction decided time call manufacturer help Roland Boucher September 1985 37 Mike Winter hoodwinked project before first test flight stage 2/21 reduction weighed 59 oz After lightening 53 oz going seven cells averaged 9 mm hopswere over 10 mm itdoes 12 1 3with weakthermal help Leisure sympathetic sent anew motor 36-to-i reduction said try seven cells 11-7 said motor damaged rear case rotated retarded timing setting getting 80% power away trip ol man Bob borrowed Champ did 815 950 high humidity day trees swaying flight made thermal assistance Champion weighed whopping 59 oz Vhen senior pilot left Virginia Champ trunk tore out servo rails changed World Engines Minis mounted servo tape took ounce tape off battery cells got rid six ounces Champ weighing 53 oz gross next flight went 13 mm 30 sec including short period soaring Bill On 815 flight Long Island motor run 5 minutesnormal six-cell LeCrate Mikes Cham pion 59 oz 5-min run resulted rather hot battery seven cells 36-to-i ratio subsequent flights made safe 4-mm run occasionally pushed 5 Later opened cooling passages air exits intake scoops After two seasons flying same battery pack found keeping extremely shallow climb angle minimizing control inputs motor still enough power climbing after 6-min run battery lukewarm afterwards called Roland Boucher said cells reach maximum efficiency just before begin go downhill foreverand such runs possible because learned properly fly given machine charge 14 16 volts per cell bit less peaking Incidentally 6-min-plus runs came after changed 3-in Trexler air wheels smallerthin Williams Brothers wheels cutaway drawing shows structural revisions some guidelines would convert other kits require brief oomment supplied Mike extra plan kit Midwest suggested revisions drawn red lines important alteration aerody namic Champion goes back mid-S Os manufactured Hal deBolt under DMECO name Americas popular single channel escapement trainer rudder ex haust baffle/venturi butterfly throttle earlier Live Wire 09 trainer 6-ft 19-powered Live Wire Senior 09 Rebel 15-powered Cub Champion book-alikes deBolt used consid erable angular difference stability set both wing stab positive angles incorporate downthrust effect reduced angular difference 50% re-sloping cabin top verge longitudinal instability less drag under power slow glide full up-trim some back stick puts wing higher L/D angle decreased incidence evident point performance envelope slow late final approach just before touching down holding some up attempt nose down get closer surface will dump lift rather hard landing done farther back final say 5 6 ft altitude strong wind momentary roller coaster effect may seen oonsider acceptable has happened twice three years producing fleeting correctable sur prise Its similar what enoounter holding off full-size J-3 Cub Champ after bounce landing premature relaxation up during recovery throttle also dumps lift can bust gear worse Mike red lines Big elongated lightening holes cut 3/32 sheet fuselage sides Aircraft ply replaced balsa Sig Lite Ply 3-in-wide cabin Gear tail dragger two torsion struts instead sheet metal trike gear option kit sheet skin stab removed leaving basic frame Lightening holes cut fin rudder elevators Only 1/16 sheet fuselage bottom Wing saddle timbers re duced cross section 3/16 x t Fulldepth sheet wing spar replaced 3/16 sq top bottom spars joined webbing D-tube sheeting could eliminated pars used MonoKote covering Rocket City strip nylon hinges extremely light needed slit X-Acto #11 blade material cut width hinge desired drop Hot Stuff side hinge halfafter insertionis strong wood fails try 38 Model Aviation Univ IflO SUDS11U11011 Dy S unuri iuruiun-wire gearand distinctive Electric-looking nose distinguish Its gas-powered brothers big wing has 590 sq area loading 1 31/i oz Also flies well direct drive Electric expertise maysupercharge power performance bigger motors Kit wing could used hardly penalty Leisure Astro motors can mount Lite Ply nose bulkhead means machine screws Both sides nose doubled Lite Ply having lightening holes cut pull out hinge pliers Bill Admittedly Midwest Cham pion example relatively easy conversion electric power However does suggest other possibilities What Champ offered assured suc cess beginners getting Electrics expertise wildering variety motors sizes battery combinationsor perhaps desire become overly involved have reader letter pictures electrified Evans Slow Motion inspired photos version just mentioned shown recent Just Fun column chap used Astro geared 05 10-8 prop Although weight 5-ft plane impossible 64 oz puts 6-mm flights aerobatics within first 12 flights thermalled motor shut down weight way 19 oz universally-recommended maximum gross Also Bill Evans getting 9 min utes aerobatics direct-drive Astro 25 Combalt Pick tail dragger possible third wheel its mechanics strut significant weight penalty already have electric motor system choose subject size wing area suits dont already have system 05-size motor offers wide selection nicely-sized planes extraordinari ly-wide spectrum things work well especially choice direct drive available gear ratio reduction drives consequently propeller sizes Good 05 models have flown areas ranging 250 725 sq incredible variation suggest area Continued page 40 Left Nose bottom removable hatch lip-tab rear small screw ply tab front 250 mAh flight battery servo-taped mid-point hatch trimming Original wheels shown switched Trexier small Williams finally homemade fat wheels detracted flight times RIght Sullivan inner rods extend almost devises horn provide minimum metal attachments tail wheel vanished cutting down gross weight present flying weight expertise sky limit May suggest game plan prefer reasonably long flights possibly occasional thermal assist ance can shut down extend duration look traditionally-stable types low structural densitywhich usually means open framework generous wing area although light sheet sides lightweight foam wings beyond pale example Champion weighs exactly same 5-ft Evans Slow Motion has all-sheet fuse lage low engine heavy Du-Bro wheels foam wing sheet balsa skin false cap strips open skinning gas model carries four-channel standard receiver 450 mAh flight pack September 1985 39 Only countershaft geared motor projects through bulkhead Blocks nose shape glued later Top corners soft V4xl/2 balsa top sheeting tween soft 3/16 Soft 3/32 sheeting used rounding off top nose Bent shafts problem Hardwood block neath shaft extension has close fit help resist shaft bending Cooling holes al ready poked intothe original bulk head afterwards air scoops exits added 11-8 narrow-blade Zinger prop shown bit much battery Interesting comparison Champ left has almost 1 sq ft area compared Winters LeCrate weighs 11-12 oz moregiving identical loadings LeCrate has six cells 21/21 reduction glides bit better Gas conversions ball park CORBEN SU 4 ACE MFG OF NI-STARTER N I-STARTER revoluti model engines used boats cars airplanes NI STARTERITMI uses HeadlocIsITMI adapter locks onto glow plugs start engine Fits pocket comes Gilt charger has LED lights up charging Rechargeable hundreds times gives over 50 consecutine starts recharging Available charger Send ad along prepayment receive free shipping handling NI-STARTER$2495 chgrger 1 0V 220V t2V fast chargerl NI-STARTER$1 595 chgrger Chgrgers$1295 chgrger flly tOV 220V t2V fast chargerl PLEASE SPECIFY WHICH CHARGER WHEN ORDERING 1/48 SCALE MODEL KIT DEPT MA 92069 $2495 Charger 12421 RANSOM DRIVE GLENN DALE MD 20769301 464-2260 Winning Ideas FOURMOST 0$ RETRACTABLE TOW HOOK RELEASE Price S690 V mn lest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight /a oz 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE $300 40 AIRFLO ENGINE MOUNT IDEAL FOR QUICKY 500 -i Cr PRICE $630 OTHER FOURMOST PRODUCTS Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming 450 500 sq 05 duration such plane sure well either direct drive available gear ratios general smaller go likely direct drive small prop high rpm will necessary con versely larger go likely need reduction drives big pro pellers Again what shooting minimum wing loading highest possible percentage battery weight gross weight choice subject its structural design determine amount rework needed bring ship within such reasonable parameters What rework talking about Consider flight loads usually far less fast aerobatic glow-engine models people can tear wing off 40-powered gas model may have double triple wing loadings will working Electric such structures extreme over kill Dont think Electric fragileso dont beef up No orgies heavy ply big blocks please have seen open-frame Electrics cartwheel pavement re ceive superficial damageand know gassies have seen destroyed cartwheeling Most kits gas engines have sheet sides Change t 3/32 3/32 1/16 use lightweight balsa Cut big light ening holes sides Bulky structural members crosspieces can always reduced size Awing runner rail rd boot can replaced medi um 3/16 x Bulkhead cutouts can enlarged perhaps leaving -or -in-wide vertical area side mere 3/32 sq across bulkhead top bottom prevents splitting Re place big corner triangle blocks 2 1/16 sq running strips Throw out aircraft plywood parts replace Lite Ply just balsa instances -in aircraft ply firewall can Hollow blocks replace sheet construction Lite Ply landing gear sup port front cabin bulkhead suffices Gussets can smaller and/or thinner No epoxy Cyanoacrylate glues ideal Top bottom fuselage sheeting 05size models can 1/16 Run top bottom grains 450 way top opposite bottom straight-across grain easily splits no matter what type model used large weight reduction possible wings youre planning aerobatics violent control movements sq spar can reduced 3/16 3/32 rib 1/16 although long ribs may need 1/16 x 3/16 cap strips instances leading edge sheeting needed kits size electric power used Trailing edges can narrowed kits use timers use spar webs over-and-under spars 1/16 sheet suffices Spar joiners gas models sinners being 3/3 2 inued page 42 40 Model Aviation NEW First planned series 1/48 scale aircraft models 1935 Corben Super-Ace single-seat sportplane powered Ford Model engine KIT FEATURES INJECTION-MOLDED PARTS COMPREHENSIVE INSTRUCTIONS MONOFILAMENT RIGGING DECALS FOR MARKINGS GOLDEN AGE SERIES SEND $1 FOR COMPLETE CATALOG 181 PAWNEE STREET SAN MARCOS CALIFORNIA nd SASE Complete Information Fjunuvjoi 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 * PLANS * TARB oby cially Turn-around thIs 850 sq in. 120 5 cycle ~$119S powered Ron Chidgey design smooth solid performer Rib templates computer plotted Plans construction hints TIGER TAIL LI Ron Chldgeys latest bast series little larger lighter slower ratains honest flight characteristics its predecess ors Plans construction hints WELLER 3 BLADE FIBERGLASS PROP Proven Nats Interna tional competition 10 x 7-315 $2000 IVANS MAGIC GADGET protractor device used Ivan Itriatensen accurately measure aileron elevator ar1 rudder throw Takes guess work Out trimming out airplane quality tool complete Instructions log book carrying case $795 SEE YOUR DEALER OR ORDER DIRECT sic PsetoesAsce 0*55 L*UscEO CuneRs Psoa LiCTaEiAHT ALorsua eevke*AE C*55 550 FULL SIZE pArreess Issue coUld iLLAsreArCo PACaicAriOs *50 PLVi5C ssreucrros5 S. 05 A5OITIAs*L PATTE555 $125 SACS 05 SIX PACK Pick Ca 5Cmas n. 515Cm WING TUBE & SOCKETS ii 4w Aluminum alloy tubing plug-In wings included peir special slipfit phenolic sockets build wing structure Now sIte models 7/8 dia x 2 5 1$ dia x 2 5 1$ dia x 3 5 ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage new 60s 17MM rca bearing Both $795for $69595 TRANSMITTER ..SE An inexpensive rugged molded case protect expensve transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1695 Gatr PJC Pro 3713 PoMpano DrIve P Penmacola FL 32514 Phone 904 4768639 INCLUDE SIW PER ITEM POR UPS TURN ~MALU WITH THE THERMAL MIXER \7 UsFrwn 423871 # Add 0 302 climbing Tate 1 Sip ttaSCbt fl5 biSSise 0 tbrinS 05 sha 555 mnfa.aaa pafihi rSeam saSs salteisa. Wiphs lj Cs TSimIs S 3900 c.M KS 5dd*eo HIGH SKY 3929 KANSAS St9 SAN DIEGO CA 92104 42 Model Aviation 14-jn ply 1/32 ply enough deep joiner full-depth joiner suf ficient using corner gussets dihedral joint leading trailing edges probably can get joiner three four model Midwest Champion size 3/16 sq over-and-under spars replace ail surfaces sheet balsa tough keep light enough Sheet tails beyond -in thickness will weigh ton light ening holes 05-size model -inthick leading edge spar strips open-frame surface can bit flimsy Diagonal crosspieces dont afraid change straight ones add rigidity Champ has dges ar important select good straight grained lightweight wood hereand eve rywhere else may have substitute what find kit Another idea sheet balsa tail surfaces butt-join two soft lightweight pieces spanwise front piece has grain running diagonally rear piece latter taking spar loads Add leading edge strip medium balsa added strength oontrol surfaces large use open construction Otherwise use soft sheet balsa lightening holes 3/16-in thick -in-thick stab Normal epoxied hinges too heavy use strip hinges previously suggested use balsa pushrods 3/16 sq sufficient dont need nless plane rather large and/or heavy used 3/16 sq LeCrate did Don Srull big Sparky Mini mize lengths 1/16 wire extensions take devises Plastic flexible pushrods fine Champ has smallersize Sullivan rods smaller lighter receiver servos better off youll Any smaller four-channel receivers fine mini receiver nice essential Use smallest-possible servosminis can spring dont need rails servo tape works fine radio battery pack need 450 mAh Ive experienced no limitations 250 mAk packs have battery cycler smart occasionally check remaining time after flying session discard pack after cycling full charge reveals maximum capacity loss 20% dont aerobatics Champ except rare fun loop shallow dive pull-up followed snap roll Since servos worked heavily such flying five flights safe 250 mAh pack provided long thermalling periods encountered dont need power controller throttle type plane way fly servo-driven microswitch on/off quite satisfactory converted Midwest Champion gan sluggish ugly duckling proved itself pleasant performer almost countless flying sessions Theres sorts stuff like out have ball suppose theres angel among used plans have filed away RC VIDEO MAGAZINE PEENTS --
Edition: Model Aviation - 1985/09
Page Numbers: 36, 37, 38, 39, 40, 42
if realism plane performance turnsyou thenthe modified MidwestChamp isone betterexampies gas kltconversion partlcuiar fiight climb held angie shown maneuvering minimized Leisure 05 seven sub-Cs 361 reduction Rev-Up 11-7 shutoff 6 mm still climbing Using up-trim slight up-elevatorfor siow gilde fiightwaa oven 0mm ALTHOUGH RC ELECTRIC S wellestablished still believe such aircraft have fragile floatersor batteryladen bombs rocket-like climbs short runs Although good spec trum Electric kits offers everything aerobatics soaring Scale often view things can fly electric power Can electrify Falcon 56 World Engines Robinhood course Theoreti cally kit could fly electric motor power common sense tells us Pattern model would require struc tural redesign whereas light cabin sport model would perform well electric power almost comes out box naturals Gentle Lady Butterfly Monarch Piece OCake sure shots offer small challenge conversion However higher pow er-to-weight ratio glow-engine model higher its wing loading difficult convert example Gus Munich gets about five minutes aerobatic flying big Top Flite warbirds converts totally light open frameworks Bud Chappell gets same World Engines Robinhood virtually un touched open framing Naccaratos fly Sig -scale Cub electric power after expert lightening-up Actually unreasonable make easy weight savings wherever canwhich brings us Midwest Champion kits its category balk statements must so success weight ranges power must know 05-powered Electric does have weigh between 35 45 oz specs 15 glow-engine-powered cabin kit can made 10 minutes electric powera low-winger like Pronto may better does Midwest Champion break 10 minutes electric power can soar motor turned off light general lift Given 10-minute duration require ment pundits roughly 33% error maximum weight did modifr Champion kit during assembly ways anyone can duplicate balsa knife razor saw gross weight still 53 oz Two prime factors concern performance envelope Electric wing loading other amount energy available battery weight rela tion gross weight Forget motor weight except part gross 20% battery weight gross 53-oz plane Champion 13 oz wing loading soso excellent 25% Champ has 23% its gross weight motor battery relationship tested crazy variety plane sizes example tiny Ranger 42 Astro Super Ferrite 05075 six 12 Ah sub-C cells impossible gross of38 oz roughly 250 sq area giving wing loading 21 oz However ratio battery weight gross excellent 33% direct drive 7-4 prop would 6 min javelin heave got 8 mm wood 8-5 prop moderate toss Motor runs beyond 5 mm can see relationship motor run total time such heavyweight difference between LeCrate Champion comparable flight times 12 oz gross about square foot area 460 sq LeCrate 590 Champion both having identical wing loadings 13 oz LeCrate used six sub-Cs 2k-to-i reduction drive 1 1-7V Rev-Up prop Champion seven cells 36-to-i reduction 11-7 Rev-Up experiment dismal beginning wanted victim someone never 36 Model Aviation Note model has gone through several revision states expected cutaway drawing some photographs will complete agreement Some revisions occurred after cutaway developed /4 X I 3A65-IEET 1/16 WEBS FIVE RIBS OUT I/BSO VERTICAL BACKHG FOR BAlTERIES -630K FOR RUBR BANDS AROUND CELL RACK 36 TO REDUCliON 1/4 TRIANGLE CORNERS SEVEN SANYO 518 C BATTERIES SQUARE AIR EXHAUST R BOTtOM L G IMO HALVES FOR PLIGHT BATTERYTREXLER NO B 2 ENTER COULING AIR ALLYOU CAN L16PLNVIOUOCOREDISI WITH FOUR CUTOUTS BEARING ~rUBE I/4SOFT BALSA FILLDJT EACH SIDE LIGHT WEK3HT WHEELS EASILY BUILT seen electric motor built original design experience limited simplest glow-engine RCand someone minimal flying skills avenged myself kids Mike idea RC spread sheet sun watch Cox 049 Gentle Lady run out its tank flying skills tasked three-channel Ace Air Scout Midwest Champion both OS 15s During visit homestead ol man handed motor labeled Leisure words might like play suspected nothing Two months later letter said might modify Champ suggestion fell deaf ears Unknowntohim IhadputtheO5 Leisure Gentle Lady expecting ooze around small parkand devastated thing barreled frees Wipe outkeep secret UPS delivered surprise Midwest Champion kit needed guinea pig appealed brother Bob Patternflying nut Mach 1 Phoenix 6 etc flight tests Bob goes out fly does trees bent Elec tric Champ climbed several hundred feet almost overhead swooped around land after 3 mm proudly called ol man Terrible said Try again two months Bob got time up 4 5 5 mm ol man kept saying enough flying six sub-C cells swinging 1 1-7 prop 2-to-i reduction decided time call manufacturer help Roland Boucher September 1985 37 Mike Winter hoodwinked project before first test flight stage 2/21 reduction weighed 59 oz After lightening 53 oz going seven cells averaged 9 mm hopswere over 10 mm itdoes 12 1 3with weakthermal help Leisure sympathetic sent anew motor 36-to-i reduction said try seven cells 11-7 said motor damaged rear case rotated retarded timing setting getting 80% power away trip ol man Bob borrowed Champ did 815 950 high humidity day trees swaying flight made thermal assistance Champion weighed whopping 59 oz Vhen senior pilot left Virginia Champ trunk tore out servo rails changed World Engines Minis mounted servo tape took ounce tape off battery cells got rid six ounces Champ weighing 53 oz gross next flight went 13 mm 30 sec including short period soaring Bill On 815 flight Long Island motor run 5 minutesnormal six-cell LeCrate Mikes Cham pion 59 oz 5-min run resulted rather hot battery seven cells 36-to-i ratio subsequent flights made safe 4-mm run occasionally pushed 5 Later opened cooling passages air exits intake scoops After two seasons flying same battery pack found keeping extremely shallow climb angle minimizing control inputs motor still enough power climbing after 6-min run battery lukewarm afterwards called Roland Boucher said cells reach maximum efficiency just before begin go downhill foreverand such runs possible because learned properly fly given machine charge 14 16 volts per cell bit less peaking Incidentally 6-min-plus runs came after changed 3-in Trexler air wheels smallerthin Williams Brothers wheels cutaway drawing shows structural revisions some guidelines would convert other kits require brief oomment supplied Mike extra plan kit Midwest suggested revisions drawn red lines important alteration aerody namic Champion goes back mid-S Os manufactured Hal deBolt under DMECO name Americas popular single channel escapement trainer rudder ex haust baffle/venturi butterfly throttle earlier Live Wire 09 trainer 6-ft 19-powered Live Wire Senior 09 Rebel 15-powered Cub Champion book-alikes deBolt used consid erable angular difference stability set both wing stab positive angles incorporate downthrust effect reduced angular difference 50% re-sloping cabin top verge longitudinal instability less drag under power slow glide full up-trim some back stick puts wing higher L/D angle decreased incidence evident point performance envelope slow late final approach just before touching down holding some up attempt nose down get closer surface will dump lift rather hard landing done farther back final say 5 6 ft altitude strong wind momentary roller coaster effect may seen oonsider acceptable has happened twice three years producing fleeting correctable sur prise Its similar what enoounter holding off full-size J-3 Cub Champ after bounce landing premature relaxation up during recovery throttle also dumps lift can bust gear worse Mike red lines Big elongated lightening holes cut 3/32 sheet fuselage sides Aircraft ply replaced balsa Sig Lite Ply 3-in-wide cabin Gear tail dragger two torsion struts instead sheet metal trike gear option kit sheet skin stab removed leaving basic frame Lightening holes cut fin rudder elevators Only 1/16 sheet fuselage bottom Wing saddle timbers re duced cross section 3/16 x t Fulldepth sheet wing spar replaced 3/16 sq top bottom spars joined webbing D-tube sheeting could eliminated pars used MonoKote covering Rocket City strip nylon hinges extremely light needed slit X-Acto #11 blade material cut width hinge desired drop Hot Stuff side hinge halfafter insertionis strong wood fails try 38 Model Aviation Univ IflO SUDS11U11011 Dy S unuri iuruiun-wire gearand distinctive Electric-looking nose distinguish Its gas-powered brothers big wing has 590 sq area loading 1 31/i oz Also flies well direct drive Electric expertise maysupercharge power performance bigger motors Kit wing could used hardly penalty Leisure Astro motors can mount Lite Ply nose bulkhead means machine screws Both sides nose doubled Lite Ply having lightening holes cut pull out hinge pliers Bill Admittedly Midwest Cham pion example relatively easy conversion electric power However does suggest other possibilities What Champ offered assured suc cess beginners getting Electrics expertise wildering variety motors sizes battery combinationsor perhaps desire become overly involved have reader letter pictures electrified Evans Slow Motion inspired photos version just mentioned shown recent Just Fun column chap used Astro geared 05 10-8 prop Although weight 5-ft plane impossible 64 oz puts 6-mm flights aerobatics within first 12 flights thermalled motor shut down weight way 19 oz universally-recommended maximum gross Also Bill Evans getting 9 min utes aerobatics direct-drive Astro 25 Combalt Pick tail dragger possible third wheel its mechanics strut significant weight penalty already have electric motor system choose subject size wing area suits dont already have system 05-size motor offers wide selection nicely-sized planes extraordinari ly-wide spectrum things work well especially choice direct drive available gear ratio reduction drives consequently propeller sizes Good 05 models have flown areas ranging 250 725 sq incredible variation suggest area Continued page 40 Left Nose bottom removable hatch lip-tab rear small screw ply tab front 250 mAh flight battery servo-taped mid-point hatch trimming Original wheels shown switched Trexier small Williams finally homemade fat wheels detracted flight times RIght Sullivan inner rods extend almost devises horn provide minimum metal attachments tail wheel vanished cutting down gross weight present flying weight expertise sky limit May suggest game plan prefer reasonably long flights possibly occasional thermal assist ance can shut down extend duration look traditionally-stable types low structural densitywhich usually means open framework generous wing area although light sheet sides lightweight foam wings beyond pale example Champion weighs exactly same 5-ft Evans Slow Motion has all-sheet fuse lage low engine heavy Du-Bro wheels foam wing sheet balsa skin false cap strips open skinning gas model carries four-channel standard receiver 450 mAh flight pack September 1985 39 Only countershaft geared motor projects through bulkhead Blocks nose shape glued later Top corners soft V4xl/2 balsa top sheeting tween soft 3/16 Soft 3/32 sheeting used rounding off top nose Bent shafts problem Hardwood block neath shaft extension has close fit help resist shaft bending Cooling holes al ready poked intothe original bulk head afterwards air scoops exits added 11-8 narrow-blade Zinger prop shown bit much battery Interesting comparison Champ left has almost 1 sq ft area compared Winters LeCrate weighs 11-12 oz moregiving identical loadings LeCrate has six cells 21/21 reduction glides bit better Gas conversions ball park CORBEN SU 4 ACE MFG OF NI-STARTER N I-STARTER revoluti model engines used boats cars airplanes NI STARTERITMI uses HeadlocIsITMI adapter locks onto glow plugs start engine Fits pocket comes Gilt charger has LED lights up charging Rechargeable hundreds times gives over 50 consecutine starts recharging Available charger Send ad along prepayment receive free shipping handling NI-STARTER$2495 chgrger 1 0V 220V t2V fast chargerl NI-STARTER$1 595 chgrger Chgrgers$1295 chgrger flly tOV 220V t2V fast chargerl PLEASE SPECIFY WHICH CHARGER WHEN ORDERING 1/48 SCALE MODEL KIT DEPT MA 92069 $2495 Charger 12421 RANSOM DRIVE GLENN DALE MD 20769301 464-2260 Winning Ideas FOURMOST 0$ RETRACTABLE TOW HOOK RELEASE Price S690 V mn lest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight /a oz 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE $300 40 AIRFLO ENGINE MOUNT IDEAL FOR QUICKY 500 -i Cr PRICE $630 OTHER FOURMOST PRODUCTS Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming 450 500 sq 05 duration such plane sure well either direct drive available gear ratios general smaller go likely direct drive small prop high rpm will necessary con versely larger go likely need reduction drives big pro pellers Again what shooting minimum wing loading highest possible percentage battery weight gross weight choice subject its structural design determine amount rework needed bring ship within such reasonable parameters What rework talking about Consider flight loads usually far less fast aerobatic glow-engine models people can tear wing off 40-powered gas model may have double triple wing loadings will working Electric such structures extreme over kill Dont think Electric fragileso dont beef up No orgies heavy ply big blocks please have seen open-frame Electrics cartwheel pavement re ceive superficial damageand know gassies have seen destroyed cartwheeling Most kits gas engines have sheet sides Change t 3/32 3/32 1/16 use lightweight balsa Cut big light ening holes sides Bulky structural members crosspieces can always reduced size Awing runner rail rd boot can replaced medi um 3/16 x Bulkhead cutouts can enlarged perhaps leaving -or -in-wide vertical area side mere 3/32 sq across bulkhead top bottom prevents splitting Re place big corner triangle blocks 2 1/16 sq running strips Throw out aircraft plywood parts replace Lite Ply just balsa instances -in aircraft ply firewall can Hollow blocks replace sheet construction Lite Ply landing gear sup port front cabin bulkhead suffices Gussets can smaller and/or thinner No epoxy Cyanoacrylate glues ideal Top bottom fuselage sheeting 05size models can 1/16 Run top bottom grains 450 way top opposite bottom straight-across grain easily splits no matter what type model used large weight reduction possible wings youre planning aerobatics violent control movements sq spar can reduced 3/16 3/32 rib 1/16 although long ribs may need 1/16 x 3/16 cap strips instances leading edge sheeting needed kits size electric power used Trailing edges can narrowed kits use timers use spar webs over-and-under spars 1/16 sheet suffices Spar joiners gas models sinners being 3/3 2 inued page 42 40 Model Aviation NEW First planned series 1/48 scale aircraft models 1935 Corben Super-Ace single-seat sportplane powered Ford Model engine KIT FEATURES INJECTION-MOLDED PARTS COMPREHENSIVE INSTRUCTIONS MONOFILAMENT RIGGING DECALS FOR MARKINGS GOLDEN AGE SERIES SEND $1 FOR COMPLETE CATALOG 181 PAWNEE STREET SAN MARCOS CALIFORNIA nd SASE Complete Information Fjunuvjoi 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 * PLANS * TARB oby cially Turn-around thIs 850 sq in. 120 5 cycle ~$119S powered Ron Chidgey design smooth solid performer Rib templates computer plotted Plans construction hints TIGER TAIL LI Ron Chldgeys latest bast series little larger lighter slower ratains honest flight characteristics its predecess ors Plans construction hints WELLER 3 BLADE FIBERGLASS PROP Proven Nats Interna tional competition 10 x 7-315 $2000 IVANS MAGIC GADGET protractor device used Ivan Itriatensen accurately measure aileron elevator ar1 rudder throw Takes guess work Out trimming out airplane quality tool complete Instructions log book carrying case $795 SEE YOUR DEALER OR ORDER DIRECT sic PsetoesAsce 0*55 L*UscEO CuneRs Psoa LiCTaEiAHT ALorsua eevke*AE C*55 550 FULL SIZE pArreess Issue coUld iLLAsreArCo PACaicAriOs *50 PLVi5C ssreucrros5 S. 05 A5OITIAs*L PATTE555 $125 SACS 05 SIX PACK Pick Ca 5Cmas n. 515Cm WING TUBE & SOCKETS ii 4w Aluminum alloy tubing plug-In wings included peir special slipfit phenolic sockets build wing structure Now sIte models 7/8 dia x 2 5 1$ dia x 2 5 1$ dia x 3 5 ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage new 60s 17MM rca bearing Both $795for $69595 TRANSMITTER ..SE An inexpensive rugged molded case protect expensve transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1695 Gatr PJC Pro 3713 PoMpano DrIve P Penmacola FL 32514 Phone 904 4768639 INCLUDE SIW PER ITEM POR UPS TURN ~MALU WITH THE THERMAL MIXER \7 UsFrwn 423871 # Add 0 302 climbing Tate 1 Sip ttaSCbt fl5 biSSise 0 tbrinS 05 sha 555 mnfa.aaa pafihi rSeam saSs salteisa. Wiphs lj Cs TSimIs S 3900 c.M KS 5dd*eo HIGH SKY 3929 KANSAS St9 SAN DIEGO CA 92104 42 Model Aviation 14-jn ply 1/32 ply enough deep joiner full-depth joiner suf ficient using corner gussets dihedral joint leading trailing edges probably can get joiner three four model Midwest Champion size 3/16 sq over-and-under spars replace ail surfaces sheet balsa tough keep light enough Sheet tails beyond -in thickness will weigh ton light ening holes 05-size model -inthick leading edge spar strips open-frame surface can bit flimsy Diagonal crosspieces dont afraid change straight ones add rigidity Champ has dges ar important select good straight grained lightweight wood hereand eve rywhere else may have substitute what find kit Another idea sheet balsa tail surfaces butt-join two soft lightweight pieces spanwise front piece has grain running diagonally rear piece latter taking spar loads Add leading edge strip medium balsa added strength oontrol surfaces large use open construction Otherwise use soft sheet balsa lightening holes 3/16-in thick -in-thick stab Normal epoxied hinges too heavy use strip hinges previously suggested use balsa pushrods 3/16 sq sufficient dont need nless plane rather large and/or heavy used 3/16 sq LeCrate did Don Srull big Sparky Mini mize lengths 1/16 wire extensions take devises Plastic flexible pushrods fine Champ has smallersize Sullivan rods smaller lighter receiver servos better off youll Any smaller four-channel receivers fine mini receiver nice essential Use smallest-possible servosminis can spring dont need rails servo tape works fine radio battery pack need 450 mAh Ive experienced no limitations 250 mAk packs have battery cycler smart occasionally check remaining time after flying session discard pack after cycling full charge reveals maximum capacity loss 20% dont aerobatics Champ except rare fun loop shallow dive pull-up followed snap roll Since servos worked heavily such flying five flights safe 250 mAh pack provided long thermalling periods encountered dont need power controller throttle type plane way fly servo-driven microswitch on/off quite satisfactory converted Midwest Champion gan sluggish ugly duckling proved itself pleasant performer almost countless flying sessions Theres sorts stuff like out have ball suppose theres angel among used plans have filed away RC VIDEO MAGAZINE PEENTS --
Edition: Model Aviation - 1985/09
Page Numbers: 36, 37, 38, 39, 40, 42
if realism plane performance turnsyou thenthe modified MidwestChamp isone betterexampies gas kltconversion partlcuiar fiight climb held angie shown maneuvering minimized Leisure 05 seven sub-Cs 361 reduction Rev-Up 11-7 shutoff 6 mm still climbing Using up-trim slight up-elevatorfor siow gilde fiightwaa oven 0mm ALTHOUGH RC ELECTRIC S wellestablished still believe such aircraft have fragile floatersor batteryladen bombs rocket-like climbs short runs Although good spec trum Electric kits offers everything aerobatics soaring Scale often view things can fly electric power Can electrify Falcon 56 World Engines Robinhood course Theoreti cally kit could fly electric motor power common sense tells us Pattern model would require struc tural redesign whereas light cabin sport model would perform well electric power almost comes out box naturals Gentle Lady Butterfly Monarch Piece OCake sure shots offer small challenge conversion However higher pow er-to-weight ratio glow-engine model higher its wing loading difficult convert example Gus Munich gets about five minutes aerobatic flying big Top Flite warbirds converts totally light open frameworks Bud Chappell gets same World Engines Robinhood virtually un touched open framing Naccaratos fly Sig -scale Cub electric power after expert lightening-up Actually unreasonable make easy weight savings wherever canwhich brings us Midwest Champion kits its category balk statements must so success weight ranges power must know 05-powered Electric does have weigh between 35 45 oz specs 15 glow-engine-powered cabin kit can made 10 minutes electric powera low-winger like Pronto may better does Midwest Champion break 10 minutes electric power can soar motor turned off light general lift Given 10-minute duration require ment pundits roughly 33% error maximum weight did modifr Champion kit during assembly ways anyone can duplicate balsa knife razor saw gross weight still 53 oz Two prime factors concern performance envelope Electric wing loading other amount energy available battery weight rela tion gross weight Forget motor weight except part gross 20% battery weight gross 53-oz plane Champion 13 oz wing loading soso excellent 25% Champ has 23% its gross weight motor battery relationship tested crazy variety plane sizes example tiny Ranger 42 Astro Super Ferrite 05075 six 12 Ah sub-C cells impossible gross of38 oz roughly 250 sq area giving wing loading 21 oz However ratio battery weight gross excellent 33% direct drive 7-4 prop would 6 min javelin heave got 8 mm wood 8-5 prop moderate toss Motor runs beyond 5 mm can see relationship motor run total time such heavyweight difference between LeCrate Champion comparable flight times 12 oz gross about square foot area 460 sq LeCrate 590 Champion both having identical wing loadings 13 oz LeCrate used six sub-Cs 2k-to-i reduction drive 1 1-7V Rev-Up prop Champion seven cells 36-to-i reduction 11-7 Rev-Up experiment dismal beginning wanted victim someone never 36 Model Aviation Note model has gone through several revision states expected cutaway drawing some photographs will complete agreement Some revisions occurred after cutaway developed /4 X I 3A65-IEET 1/16 WEBS FIVE RIBS OUT I/BSO VERTICAL BACKHG FOR BAlTERIES -630K FOR RUBR BANDS AROUND CELL RACK 36 TO REDUCliON 1/4 TRIANGLE CORNERS SEVEN SANYO 518 C BATTERIES SQUARE AIR EXHAUST R BOTtOM L G IMO HALVES FOR PLIGHT BATTERYTREXLER NO B 2 ENTER COULING AIR ALLYOU CAN L16PLNVIOUOCOREDISI WITH FOUR CUTOUTS BEARING ~rUBE I/4SOFT BALSA FILLDJT EACH SIDE LIGHT WEK3HT WHEELS EASILY BUILT seen electric motor built original design experience limited simplest glow-engine RCand someone minimal flying skills avenged myself kids Mike idea RC spread sheet sun watch Cox 049 Gentle Lady run out its tank flying skills tasked three-channel Ace Air Scout Midwest Champion both OS 15s During visit homestead ol man handed motor labeled Leisure words might like play suspected nothing Two months later letter said might modify Champ suggestion fell deaf ears Unknowntohim IhadputtheO5 Leisure Gentle Lady expecting ooze around small parkand devastated thing barreled frees Wipe outkeep secret UPS delivered surprise Midwest Champion kit needed guinea pig appealed brother Bob Patternflying nut Mach 1 Phoenix 6 etc flight tests Bob goes out fly does trees bent Elec tric Champ climbed several hundred feet almost overhead swooped around land after 3 mm proudly called ol man Terrible said Try again two months Bob got time up 4 5 5 mm ol man kept saying enough flying six sub-C cells swinging 1 1-7 prop 2-to-i reduction decided time call manufacturer help Roland Boucher September 1985 37 Mike Winter hoodwinked project before first test flight stage 2/21 reduction weighed 59 oz After lightening 53 oz going seven cells averaged 9 mm hopswere over 10 mm itdoes 12 1 3with weakthermal help Leisure sympathetic sent anew motor 36-to-i reduction said try seven cells 11-7 said motor damaged rear case rotated retarded timing setting getting 80% power away trip ol man Bob borrowed Champ did 815 950 high humidity day trees swaying flight made thermal assistance Champion weighed whopping 59 oz Vhen senior pilot left Virginia Champ trunk tore out servo rails changed World Engines Minis mounted servo tape took ounce tape off battery cells got rid six ounces Champ weighing 53 oz gross next flight went 13 mm 30 sec including short period soaring Bill On 815 flight Long Island motor run 5 minutesnormal six-cell LeCrate Mikes Cham pion 59 oz 5-min run resulted rather hot battery seven cells 36-to-i ratio subsequent flights made safe 4-mm run occasionally pushed 5 Later opened cooling passages air exits intake scoops After two seasons flying same battery pack found keeping extremely shallow climb angle minimizing control inputs motor still enough power climbing after 6-min run battery lukewarm afterwards called Roland Boucher said cells reach maximum efficiency just before begin go downhill foreverand such runs possible because learned properly fly given machine charge 14 16 volts per cell bit less peaking Incidentally 6-min-plus runs came after changed 3-in Trexler air wheels smallerthin Williams Brothers wheels cutaway drawing shows structural revisions some guidelines would convert other kits require brief oomment supplied Mike extra plan kit Midwest suggested revisions drawn red lines important alteration aerody namic Champion goes back mid-S Os manufactured Hal deBolt under DMECO name Americas popular single channel escapement trainer rudder ex haust baffle/venturi butterfly throttle earlier Live Wire 09 trainer 6-ft 19-powered Live Wire Senior 09 Rebel 15-powered Cub Champion book-alikes deBolt used consid erable angular difference stability set both wing stab positive angles incorporate downthrust effect reduced angular difference 50% re-sloping cabin top verge longitudinal instability less drag under power slow glide full up-trim some back stick puts wing higher L/D angle decreased incidence evident point performance envelope slow late final approach just before touching down holding some up attempt nose down get closer surface will dump lift rather hard landing done farther back final say 5 6 ft altitude strong wind momentary roller coaster effect may seen oonsider acceptable has happened twice three years producing fleeting correctable sur prise Its similar what enoounter holding off full-size J-3 Cub Champ after bounce landing premature relaxation up during recovery throttle also dumps lift can bust gear worse Mike red lines Big elongated lightening holes cut 3/32 sheet fuselage sides Aircraft ply replaced balsa Sig Lite Ply 3-in-wide cabin Gear tail dragger two torsion struts instead sheet metal trike gear option kit sheet skin stab removed leaving basic frame Lightening holes cut fin rudder elevators Only 1/16 sheet fuselage bottom Wing saddle timbers re duced cross section 3/16 x t Fulldepth sheet wing spar replaced 3/16 sq top bottom spars joined webbing D-tube sheeting could eliminated pars used MonoKote covering Rocket City strip nylon hinges extremely light needed slit X-Acto #11 blade material cut width hinge desired drop Hot Stuff side hinge halfafter insertionis strong wood fails try 38 Model Aviation Univ IflO SUDS11U11011 Dy S unuri iuruiun-wire gearand distinctive Electric-looking nose distinguish Its gas-powered brothers big wing has 590 sq area loading 1 31/i oz Also flies well direct drive Electric expertise maysupercharge power performance bigger motors Kit wing could used hardly penalty Leisure Astro motors can mount Lite Ply nose bulkhead means machine screws Both sides nose doubled Lite Ply having lightening holes cut pull out hinge pliers Bill Admittedly Midwest Cham pion example relatively easy conversion electric power However does suggest other possibilities What Champ offered assured suc cess beginners getting Electrics expertise wildering variety motors sizes battery combinationsor perhaps desire become overly involved have reader letter pictures electrified Evans Slow Motion inspired photos version just mentioned shown recent Just Fun column chap used Astro geared 05 10-8 prop Although weight 5-ft plane impossible 64 oz puts 6-mm flights aerobatics within first 12 flights thermalled motor shut down weight way 19 oz universally-recommended maximum gross Also Bill Evans getting 9 min utes aerobatics direct-drive Astro 25 Combalt Pick tail dragger possible third wheel its mechanics strut significant weight penalty already have electric motor system choose subject size wing area suits dont already have system 05-size motor offers wide selection nicely-sized planes extraordinari ly-wide spectrum things work well especially choice direct drive available gear ratio reduction drives consequently propeller sizes Good 05 models have flown areas ranging 250 725 sq incredible variation suggest area Continued page 40 Left Nose bottom removable hatch lip-tab rear small screw ply tab front 250 mAh flight battery servo-taped mid-point hatch trimming Original wheels shown switched Trexier small Williams finally homemade fat wheels detracted flight times RIght Sullivan inner rods extend almost devises horn provide minimum metal attachments tail wheel vanished cutting down gross weight present flying weight expertise sky limit May suggest game plan prefer reasonably long flights possibly occasional thermal assist ance can shut down extend duration look traditionally-stable types low structural densitywhich usually means open framework generous wing area although light sheet sides lightweight foam wings beyond pale example Champion weighs exactly same 5-ft Evans Slow Motion has all-sheet fuse lage low engine heavy Du-Bro wheels foam wing sheet balsa skin false cap strips open skinning gas model carries four-channel standard receiver 450 mAh flight pack September 1985 39 Only countershaft geared motor projects through bulkhead Blocks nose shape glued later Top corners soft V4xl/2 balsa top sheeting tween soft 3/16 Soft 3/32 sheeting used rounding off top nose Bent shafts problem Hardwood block neath shaft extension has close fit help resist shaft bending Cooling holes al ready poked intothe original bulk head afterwards air scoops exits added 11-8 narrow-blade Zinger prop shown bit much battery Interesting comparison Champ left has almost 1 sq ft area compared Winters LeCrate weighs 11-12 oz moregiving identical loadings LeCrate has six cells 21/21 reduction glides bit better Gas conversions ball park CORBEN SU 4 ACE MFG OF NI-STARTER N I-STARTER revoluti model engines used boats cars airplanes NI STARTERITMI uses HeadlocIsITMI adapter locks onto glow plugs start engine Fits pocket comes Gilt charger has LED lights up charging Rechargeable hundreds times gives over 50 consecutine starts recharging Available charger Send ad along prepayment receive free shipping handling NI-STARTER$2495 chgrger 1 0V 220V t2V fast chargerl NI-STARTER$1 595 chgrger Chgrgers$1295 chgrger flly tOV 220V t2V fast chargerl PLEASE SPECIFY WHICH CHARGER WHEN ORDERING 1/48 SCALE MODEL KIT DEPT MA 92069 $2495 Charger 12421 RANSOM DRIVE GLENN DALE MD 20769301 464-2260 Winning Ideas FOURMOST 0$ RETRACTABLE TOW HOOK RELEASE Price S690 V mn lest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight /a oz 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE $300 40 AIRFLO ENGINE MOUNT IDEAL FOR QUICKY 500 -i Cr PRICE $630 OTHER FOURMOST PRODUCTS Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming 450 500 sq 05 duration such plane sure well either direct drive available gear ratios general smaller go likely direct drive small prop high rpm will necessary con versely larger go likely need reduction drives big pro pellers Again what shooting minimum wing loading highest possible percentage battery weight gross weight choice subject its structural design determine amount rework needed bring ship within such reasonable parameters What rework talking about Consider flight loads usually far less fast aerobatic glow-engine models people can tear wing off 40-powered gas model may have double triple wing loadings will working Electric such structures extreme over kill Dont think Electric fragileso dont beef up No orgies heavy ply big blocks please have seen open-frame Electrics cartwheel pavement re ceive superficial damageand know gassies have seen destroyed cartwheeling Most kits gas engines have sheet sides Change t 3/32 3/32 1/16 use lightweight balsa Cut big light ening holes sides Bulky structural members crosspieces can always reduced size Awing runner rail rd boot can replaced medi um 3/16 x Bulkhead cutouts can enlarged perhaps leaving -or -in-wide vertical area side mere 3/32 sq across bulkhead top bottom prevents splitting Re place big corner triangle blocks 2 1/16 sq running strips Throw out aircraft plywood parts replace Lite Ply just balsa instances -in aircraft ply firewall can Hollow blocks replace sheet construction Lite Ply landing gear sup port front cabin bulkhead suffices Gussets can smaller and/or thinner No epoxy Cyanoacrylate glues ideal Top bottom fuselage sheeting 05size models can 1/16 Run top bottom grains 450 way top opposite bottom straight-across grain easily splits no matter what type model used large weight reduction possible wings youre planning aerobatics violent control movements sq spar can reduced 3/16 3/32 rib 1/16 although long ribs may need 1/16 x 3/16 cap strips instances leading edge sheeting needed kits size electric power used Trailing edges can narrowed kits use timers use spar webs over-and-under spars 1/16 sheet suffices Spar joiners gas models sinners being 3/3 2 inued page 42 40 Model Aviation NEW First planned series 1/48 scale aircraft models 1935 Corben Super-Ace single-seat sportplane powered Ford Model engine KIT FEATURES INJECTION-MOLDED PARTS COMPREHENSIVE INSTRUCTIONS MONOFILAMENT RIGGING DECALS FOR MARKINGS GOLDEN AGE SERIES SEND $1 FOR COMPLETE CATALOG 181 PAWNEE STREET SAN MARCOS CALIFORNIA nd SASE Complete Information Fjunuvjoi 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 * PLANS * TARB oby cially Turn-around thIs 850 sq in. 120 5 cycle ~$119S powered Ron Chidgey design smooth solid performer Rib templates computer plotted Plans construction hints TIGER TAIL LI Ron Chldgeys latest bast series little larger lighter slower ratains honest flight characteristics its predecess ors Plans construction hints WELLER 3 BLADE FIBERGLASS PROP Proven Nats Interna tional competition 10 x 7-315 $2000 IVANS MAGIC GADGET protractor device used Ivan Itriatensen accurately measure aileron elevator ar1 rudder throw Takes guess work Out trimming out airplane quality tool complete Instructions log book carrying case $795 SEE YOUR DEALER OR ORDER DIRECT sic PsetoesAsce 0*55 L*UscEO CuneRs Psoa LiCTaEiAHT ALorsua eevke*AE C*55 550 FULL SIZE pArreess Issue coUld iLLAsreArCo PACaicAriOs *50 PLVi5C ssreucrros5 S. 05 A5OITIAs*L PATTE555 $125 SACS 05 SIX PACK Pick Ca 5Cmas n. 515Cm WING TUBE & SOCKETS ii 4w Aluminum alloy tubing plug-In wings included peir special slipfit phenolic sockets build wing structure Now sIte models 7/8 dia x 2 5 1$ dia x 2 5 1$ dia x 3 5 ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage new 60s 17MM rca bearing Both $795for $69595 TRANSMITTER ..SE An inexpensive rugged molded case protect expensve transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1695 Gatr PJC Pro 3713 PoMpano DrIve P Penmacola FL 32514 Phone 904 4768639 INCLUDE SIW PER ITEM POR UPS TURN ~MALU WITH THE THERMAL MIXER \7 UsFrwn 423871 # Add 0 302 climbing Tate 1 Sip ttaSCbt fl5 biSSise 0 tbrinS 05 sha 555 mnfa.aaa pafihi rSeam saSs salteisa. Wiphs lj Cs TSimIs S 3900 c.M KS 5dd*eo HIGH SKY 3929 KANSAS St9 SAN DIEGO CA 92104 42 Model Aviation 14-jn ply 1/32 ply enough deep joiner full-depth joiner suf ficient using corner gussets dihedral joint leading trailing edges probably can get joiner three four model Midwest Champion size 3/16 sq over-and-under spars replace ail surfaces sheet balsa tough keep light enough Sheet tails beyond -in thickness will weigh ton light ening holes 05-size model -inthick leading edge spar strips open-frame surface can bit flimsy Diagonal crosspieces dont afraid change straight ones add rigidity Champ has dges ar important select good straight grained lightweight wood hereand eve rywhere else may have substitute what find kit Another idea sheet balsa tail surfaces butt-join two soft lightweight pieces spanwise front piece has grain running diagonally rear piece latter taking spar loads Add leading edge strip medium balsa added strength oontrol surfaces large use open construction Otherwise use soft sheet balsa lightening holes 3/16-in thick -in-thick stab Normal epoxied hinges too heavy use strip hinges previously suggested use balsa pushrods 3/16 sq sufficient dont need nless plane rather large and/or heavy used 3/16 sq LeCrate did Don Srull big Sparky Mini mize lengths 1/16 wire extensions take devises Plastic flexible pushrods fine Champ has smallersize Sullivan rods smaller lighter receiver servos better off youll Any smaller four-channel receivers fine mini receiver nice essential Use smallest-possible servosminis can spring dont need rails servo tape works fine radio battery pack need 450 mAh Ive experienced no limitations 250 mAk packs have battery cycler smart occasionally check remaining time after flying session discard pack after cycling full charge reveals maximum capacity loss 20% dont aerobatics Champ except rare fun loop shallow dive pull-up followed snap roll Since servos worked heavily such flying five flights safe 250 mAh pack provided long thermalling periods encountered dont need power controller throttle type plane way fly servo-driven microswitch on/off quite satisfactory converted Midwest Champion gan sluggish ugly duckling proved itself pleasant performer almost countless flying sessions Theres sorts stuff like out have ball suppose theres angel among used plans have filed away RC VIDEO MAGAZINE PEENTS --
Edition: Model Aviation - 1985/09
Page Numbers: 36, 37, 38, 39, 40, 42
if realism plane performance turnsyou thenthe modified MidwestChamp isone betterexampies gas kltconversion partlcuiar fiight climb held angie shown maneuvering minimized Leisure 05 seven sub-Cs 361 reduction Rev-Up 11-7 shutoff 6 mm still climbing Using up-trim slight up-elevatorfor siow gilde fiightwaa oven 0mm ALTHOUGH RC ELECTRIC S wellestablished still believe such aircraft have fragile floatersor batteryladen bombs rocket-like climbs short runs Although good spec trum Electric kits offers everything aerobatics soaring Scale often view things can fly electric power Can electrify Falcon 56 World Engines Robinhood course Theoreti cally kit could fly electric motor power common sense tells us Pattern model would require struc tural redesign whereas light cabin sport model would perform well electric power almost comes out box naturals Gentle Lady Butterfly Monarch Piece OCake sure shots offer small challenge conversion However higher pow er-to-weight ratio glow-engine model higher its wing loading difficult convert example Gus Munich gets about five minutes aerobatic flying big Top Flite warbirds converts totally light open frameworks Bud Chappell gets same World Engines Robinhood virtually un touched open framing Naccaratos fly Sig -scale Cub electric power after expert lightening-up Actually unreasonable make easy weight savings wherever canwhich brings us Midwest Champion kits its category balk statements must so success weight ranges power must know 05-powered Electric does have weigh between 35 45 oz specs 15 glow-engine-powered cabin kit can made 10 minutes electric powera low-winger like Pronto may better does Midwest Champion break 10 minutes electric power can soar motor turned off light general lift Given 10-minute duration require ment pundits roughly 33% error maximum weight did modifr Champion kit during assembly ways anyone can duplicate balsa knife razor saw gross weight still 53 oz Two prime factors concern performance envelope Electric wing loading other amount energy available battery weight rela tion gross weight Forget motor weight except part gross 20% battery weight gross 53-oz plane Champion 13 oz wing loading soso excellent 25% Champ has 23% its gross weight motor battery relationship tested crazy variety plane sizes example tiny Ranger 42 Astro Super Ferrite 05075 six 12 Ah sub-C cells impossible gross of38 oz roughly 250 sq area giving wing loading 21 oz However ratio battery weight gross excellent 33% direct drive 7-4 prop would 6 min javelin heave got 8 mm wood 8-5 prop moderate toss Motor runs beyond 5 mm can see relationship motor run total time such heavyweight difference between LeCrate Champion comparable flight times 12 oz gross about square foot area 460 sq LeCrate 590 Champion both having identical wing loadings 13 oz LeCrate used six sub-Cs 2k-to-i reduction drive 1 1-7V Rev-Up prop Champion seven cells 36-to-i reduction 11-7 Rev-Up experiment dismal beginning wanted victim someone never 36 Model Aviation Note model has gone through several revision states expected cutaway drawing some photographs will complete agreement Some revisions occurred after cutaway developed /4 X I 3A65-IEET 1/16 WEBS FIVE RIBS OUT I/BSO VERTICAL BACKHG FOR BAlTERIES -630K FOR RUBR BANDS AROUND CELL RACK 36 TO REDUCliON 1/4 TRIANGLE CORNERS SEVEN SANYO 518 C BATTERIES SQUARE AIR EXHAUST R BOTtOM L G IMO HALVES FOR PLIGHT BATTERYTREXLER NO B 2 ENTER COULING AIR ALLYOU CAN L16PLNVIOUOCOREDISI WITH FOUR CUTOUTS BEARING ~rUBE I/4SOFT BALSA FILLDJT EACH SIDE LIGHT WEK3HT WHEELS EASILY BUILT seen electric motor built original design experience limited simplest glow-engine RCand someone minimal flying skills avenged myself kids Mike idea RC spread sheet sun watch Cox 049 Gentle Lady run out its tank flying skills tasked three-channel Ace Air Scout Midwest Champion both OS 15s During visit homestead ol man handed motor labeled Leisure words might like play suspected nothing Two months later letter said might modify Champ suggestion fell deaf ears Unknowntohim IhadputtheO5 Leisure Gentle Lady expecting ooze around small parkand devastated thing barreled frees Wipe outkeep secret UPS delivered surprise Midwest Champion kit needed guinea pig appealed brother Bob Patternflying nut Mach 1 Phoenix 6 etc flight tests Bob goes out fly does trees bent Elec tric Champ climbed several hundred feet almost overhead swooped around land after 3 mm proudly called ol man Terrible said Try again two months Bob got time up 4 5 5 mm ol man kept saying enough flying six sub-C cells swinging 1 1-7 prop 2-to-i reduction decided time call manufacturer help Roland Boucher September 1985 37 Mike Winter hoodwinked project before first test flight stage 2/21 reduction weighed 59 oz After lightening 53 oz going seven cells averaged 9 mm hopswere over 10 mm itdoes 12 1 3with weakthermal help Leisure sympathetic sent anew motor 36-to-i reduction said try seven cells 11-7 said motor damaged rear case rotated retarded timing setting getting 80% power away trip ol man Bob borrowed Champ did 815 950 high humidity day trees swaying flight made thermal assistance Champion weighed whopping 59 oz Vhen senior pilot left Virginia Champ trunk tore out servo rails changed World Engines Minis mounted servo tape took ounce tape off battery cells got rid six ounces Champ weighing 53 oz gross next flight went 13 mm 30 sec including short period soaring Bill On 815 flight Long Island motor run 5 minutesnormal six-cell LeCrate Mikes Cham pion 59 oz 5-min run resulted rather hot battery seven cells 36-to-i ratio subsequent flights made safe 4-mm run occasionally pushed 5 Later opened cooling passages air exits intake scoops After two seasons flying same battery pack found keeping extremely shallow climb angle minimizing control inputs motor still enough power climbing after 6-min run battery lukewarm afterwards called Roland Boucher said cells reach maximum efficiency just before begin go downhill foreverand such runs possible because learned properly fly given machine charge 14 16 volts per cell bit less peaking Incidentally 6-min-plus runs came after changed 3-in Trexler air wheels smallerthin Williams Brothers wheels cutaway drawing shows structural revisions some guidelines would convert other kits require brief oomment supplied Mike extra plan kit Midwest suggested revisions drawn red lines important alteration aerody namic Champion goes back mid-S Os manufactured Hal deBolt under DMECO name Americas popular single channel escapement trainer rudder ex haust baffle/venturi butterfly throttle earlier Live Wire 09 trainer 6-ft 19-powered Live Wire Senior 09 Rebel 15-powered Cub Champion book-alikes deBolt used consid erable angular difference stability set both wing stab positive angles incorporate downthrust effect reduced angular difference 50% re-sloping cabin top verge longitudinal instability less drag under power slow glide full up-trim some back stick puts wing higher L/D angle decreased incidence evident point performance envelope slow late final approach just before touching down holding some up attempt nose down get closer surface will dump lift rather hard landing done farther back final say 5 6 ft altitude strong wind momentary roller coaster effect may seen oonsider acceptable has happened twice three years producing fleeting correctable sur prise Its similar what enoounter holding off full-size J-3 Cub Champ after bounce landing premature relaxation up during recovery throttle also dumps lift can bust gear worse Mike red lines Big elongated lightening holes cut 3/32 sheet fuselage sides Aircraft ply replaced balsa Sig Lite Ply 3-in-wide cabin Gear tail dragger two torsion struts instead sheet metal trike gear option kit sheet skin stab removed leaving basic frame Lightening holes cut fin rudder elevators Only 1/16 sheet fuselage bottom Wing saddle timbers re duced cross section 3/16 x t Fulldepth sheet wing spar replaced 3/16 sq top bottom spars joined webbing D-tube sheeting could eliminated pars used MonoKote covering Rocket City strip nylon hinges extremely light needed slit X-Acto #11 blade material cut width hinge desired drop Hot Stuff side hinge halfafter insertionis strong wood fails try 38 Model Aviation Univ IflO SUDS11U11011 Dy S unuri iuruiun-wire gearand distinctive Electric-looking nose distinguish Its gas-powered brothers big wing has 590 sq area loading 1 31/i oz Also flies well direct drive Electric expertise maysupercharge power performance bigger motors Kit wing could used hardly penalty Leisure Astro motors can mount Lite Ply nose bulkhead means machine screws Both sides nose doubled Lite Ply having lightening holes cut pull out hinge pliers Bill Admittedly Midwest Cham pion example relatively easy conversion electric power However does suggest other possibilities What Champ offered assured suc cess beginners getting Electrics expertise wildering variety motors sizes battery combinationsor perhaps desire become overly involved have reader letter pictures electrified Evans Slow Motion inspired photos version just mentioned shown recent Just Fun column chap used Astro geared 05 10-8 prop Although weight 5-ft plane impossible 64 oz puts 6-mm flights aerobatics within first 12 flights thermalled motor shut down weight way 19 oz universally-recommended maximum gross Also Bill Evans getting 9 min utes aerobatics direct-drive Astro 25 Combalt Pick tail dragger possible third wheel its mechanics strut significant weight penalty already have electric motor system choose subject size wing area suits dont already have system 05-size motor offers wide selection nicely-sized planes extraordinari ly-wide spectrum things work well especially choice direct drive available gear ratio reduction drives consequently propeller sizes Good 05 models have flown areas ranging 250 725 sq incredible variation suggest area Continued page 40 Left Nose bottom removable hatch lip-tab rear small screw ply tab front 250 mAh flight battery servo-taped mid-point hatch trimming Original wheels shown switched Trexier small Williams finally homemade fat wheels detracted flight times RIght Sullivan inner rods extend almost devises horn provide minimum metal attachments tail wheel vanished cutting down gross weight present flying weight expertise sky limit May suggest game plan prefer reasonably long flights possibly occasional thermal assist ance can shut down extend duration look traditionally-stable types low structural densitywhich usually means open framework generous wing area although light sheet sides lightweight foam wings beyond pale example Champion weighs exactly same 5-ft Evans Slow Motion has all-sheet fuse lage low engine heavy Du-Bro wheels foam wing sheet balsa skin false cap strips open skinning gas model carries four-channel standard receiver 450 mAh flight pack September 1985 39 Only countershaft geared motor projects through bulkhead Blocks nose shape glued later Top corners soft V4xl/2 balsa top sheeting tween soft 3/16 Soft 3/32 sheeting used rounding off top nose Bent shafts problem Hardwood block neath shaft extension has close fit help resist shaft bending Cooling holes al ready poked intothe original bulk head afterwards air scoops exits added 11-8 narrow-blade Zinger prop shown bit much battery Interesting comparison Champ left has almost 1 sq ft area compared Winters LeCrate weighs 11-12 oz moregiving identical loadings LeCrate has six cells 21/21 reduction glides bit better Gas conversions ball park CORBEN SU 4 ACE MFG OF NI-STARTER N I-STARTER revoluti model engines used boats cars airplanes NI STARTERITMI uses HeadlocIsITMI adapter locks onto glow plugs start engine Fits pocket comes Gilt charger has LED lights up charging Rechargeable hundreds times gives over 50 consecutine starts recharging Available charger Send ad along prepayment receive free shipping handling NI-STARTER$2495 chgrger 1 0V 220V t2V fast chargerl NI-STARTER$1 595 chgrger Chgrgers$1295 chgrger flly tOV 220V t2V fast chargerl PLEASE SPECIFY WHICH CHARGER WHEN ORDERING 1/48 SCALE MODEL KIT DEPT MA 92069 $2495 Charger 12421 RANSOM DRIVE GLENN DALE MD 20769301 464-2260 Winning Ideas FOURMOST 0$ RETRACTABLE TOW HOOK RELEASE Price S690 V mn lest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight /a oz 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE $300 40 AIRFLO ENGINE MOUNT IDEAL FOR QUICKY 500 -i Cr PRICE $630 OTHER FOURMOST PRODUCTS Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming 450 500 sq 05 duration such plane sure well either direct drive available gear ratios general smaller go likely direct drive small prop high rpm will necessary con versely larger go likely need reduction drives big pro pellers Again what shooting minimum wing loading highest possible percentage battery weight gross weight choice subject its structural design determine amount rework needed bring ship within such reasonable parameters What rework talking about Consider flight loads usually far less fast aerobatic glow-engine models people can tear wing off 40-powered gas model may have double triple wing loadings will working Electric such structures extreme over kill Dont think Electric fragileso dont beef up No orgies heavy ply big blocks please have seen open-frame Electrics cartwheel pavement re ceive superficial damageand know gassies have seen destroyed cartwheeling Most kits gas engines have sheet sides Change t 3/32 3/32 1/16 use lightweight balsa Cut big light ening holes sides Bulky structural members crosspieces can always reduced size Awing runner rail rd boot can replaced medi um 3/16 x Bulkhead cutouts can enlarged perhaps leaving -or -in-wide vertical area side mere 3/32 sq across bulkhead top bottom prevents splitting Re place big corner triangle blocks 2 1/16 sq running strips Throw out aircraft plywood parts replace Lite Ply just balsa instances -in aircraft ply firewall can Hollow blocks replace sheet construction Lite Ply landing gear sup port front cabin bulkhead suffices Gussets can smaller and/or thinner No epoxy Cyanoacrylate glues ideal Top bottom fuselage sheeting 05size models can 1/16 Run top bottom grains 450 way top opposite bottom straight-across grain easily splits no matter what type model used large weight reduction possible wings youre planning aerobatics violent control movements sq spar can reduced 3/16 3/32 rib 1/16 although long ribs may need 1/16 x 3/16 cap strips instances leading edge sheeting needed kits size electric power used Trailing edges can narrowed kits use timers use spar webs over-and-under spars 1/16 sheet suffices Spar joiners gas models sinners being 3/3 2 inued page 42 40 Model Aviation NEW First planned series 1/48 scale aircraft models 1935 Corben Super-Ace single-seat sportplane powered Ford Model engine KIT FEATURES INJECTION-MOLDED PARTS COMPREHENSIVE INSTRUCTIONS MONOFILAMENT RIGGING DECALS FOR MARKINGS GOLDEN AGE SERIES SEND $1 FOR COMPLETE CATALOG 181 PAWNEE STREET SAN MARCOS CALIFORNIA nd SASE Complete Information Fjunuvjoi 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 * PLANS * TARB oby cially Turn-around thIs 850 sq in. 120 5 cycle ~$119S powered Ron Chidgey design smooth solid performer Rib templates computer plotted Plans construction hints TIGER TAIL LI Ron Chldgeys latest bast series little larger lighter slower ratains honest flight characteristics its predecess ors Plans construction hints WELLER 3 BLADE FIBERGLASS PROP Proven Nats Interna tional competition 10 x 7-315 $2000 IVANS MAGIC GADGET protractor device used Ivan Itriatensen accurately measure aileron elevator ar1 rudder throw Takes guess work Out trimming out airplane quality tool complete Instructions log book carrying case $795 SEE YOUR DEALER OR ORDER DIRECT sic PsetoesAsce 0*55 L*UscEO CuneRs Psoa LiCTaEiAHT ALorsua eevke*AE C*55 550 FULL SIZE pArreess Issue coUld iLLAsreArCo PACaicAriOs *50 PLVi5C ssreucrros5 S. 05 A5OITIAs*L PATTE555 $125 SACS 05 SIX PACK Pick Ca 5Cmas n. 515Cm WING TUBE & SOCKETS ii 4w Aluminum alloy tubing plug-In wings included peir special slipfit phenolic sockets build wing structure Now sIte models 7/8 dia x 2 5 1$ dia x 2 5 1$ dia x 3 5 ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage new 60s 17MM rca bearing Both $795for $69595 TRANSMITTER ..SE An inexpensive rugged molded case protect expensve transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1695 Gatr PJC Pro 3713 PoMpano DrIve P Penmacola FL 32514 Phone 904 4768639 INCLUDE SIW PER ITEM POR UPS TURN ~MALU WITH THE THERMAL MIXER \7 UsFrwn 423871 # Add 0 302 climbing Tate 1 Sip ttaSCbt fl5 biSSise 0 tbrinS 05 sha 555 mnfa.aaa pafihi rSeam saSs salteisa. Wiphs lj Cs TSimIs S 3900 c.M KS 5dd*eo HIGH SKY 3929 KANSAS St9 SAN DIEGO CA 92104 42 Model Aviation 14-jn ply 1/32 ply enough deep joiner full-depth joiner suf ficient using corner gussets dihedral joint leading trailing edges probably can get joiner three four model Midwest Champion size 3/16 sq over-and-under spars replace ail surfaces sheet balsa tough keep light enough Sheet tails beyond -in thickness will weigh ton light ening holes 05-size model -inthick leading edge spar strips open-frame surface can bit flimsy Diagonal crosspieces dont afraid change straight ones add rigidity Champ has dges ar important select good straight grained lightweight wood hereand eve rywhere else may have substitute what find kit Another idea sheet balsa tail surfaces butt-join two soft lightweight pieces spanwise front piece has grain running diagonally rear piece latter taking spar loads Add leading edge strip medium balsa added strength oontrol surfaces large use open construction Otherwise use soft sheet balsa lightening holes 3/16-in thick -in-thick stab Normal epoxied hinges too heavy use strip hinges previously suggested use balsa pushrods 3/16 sq sufficient dont need nless plane rather large and/or heavy used 3/16 sq LeCrate did Don Srull big Sparky Mini mize lengths 1/16 wire extensions take devises Plastic flexible pushrods fine Champ has smallersize Sullivan rods smaller lighter receiver servos better off youll Any smaller four-channel receivers fine mini receiver nice essential Use smallest-possible servosminis can spring dont need rails servo tape works fine radio battery pack need 450 mAh Ive experienced no limitations 250 mAk packs have battery cycler smart occasionally check remaining time after flying session discard pack after cycling full charge reveals maximum capacity loss 20% dont aerobatics Champ except rare fun loop shallow dive pull-up followed snap roll Since servos worked heavily such flying five flights safe 250 mAh pack provided long thermalling periods encountered dont need power controller throttle type plane way fly servo-driven microswitch on/off quite satisfactory converted Midwest Champion gan sluggish ugly duckling proved itself pleasant performer almost countless flying sessions Theres sorts stuff like out have ball suppose theres angel among used plans have filed away RC VIDEO MAGAZINE PEENTS --