Profile Bearcat

IF NECESSITY mother invention Profile Bearcat born need flying engine testbed exercise merits rather wild idea about engine performance Stunt ship wanted test engine mounted profile posi tion standard profile setup engine mounted facing outboard wanted cylinder facing inside circle As will try explain later felt performance engine being adversely affected standard Stunt ships inverted mount inboard cylinder placement let centrifugal force keep glow plug free oil thus promote better ignition characteristics hopefully better Stunt run came about end 1981 flying season felt needed steadier en gine run getting Oh plenty power ST 60 1 running power spare really just wasnt sounding like engines top 20 fliers Seguin Nats ear top 20 sound round maneuvers rarely breaks alla solid four-cycle way around four years running ST 60 1 never able run quite manner wanted able run big prop real slowly full built-up fuselage testbed airplane out question needed airplane would fairly quick build knew flew well impor tantly easy access engine tank associated plumbing pro file Since can muster enough energy undertake Stunt ship year risking whole season something might work 1978 built full-blown molded fuselage Rabe Bearcat about 56 oz ST 46 power sported nice enough finish receive 16 appearance points Lake Charles Nats summer plane flew great Unfortunately wasn t its equal seriously flying Stunt two three years time performance good first Nats satisfied Stunt ships Ive flown Bearcat different No other plane has shown inherent well-damped dynamic response Bearcat possesses will fly out hard corner trace bobble overshoot No matter hard 4 pur r hit corner just turns lays have always felt Bearcat has benefitted its short nose tail lengths resulting lower-than-normal pitch inertia feel lower pitch ertia comparison todays Stunters contributes superior damping pitch Bearcat possesses Also fluencing pitch dynamics items like Bearcats flap size impor tantly CG placement rearward CG can located better pitch damping up point course must coordinated line spacings con trol throw etc achieve perfect feel several years wanting try another Bearcat testbed profile tall fuselage would hide muf fler exhaust stack would pointing up instead out inboard side rea soned Profile Bearcat basically copy Rabe Bearcat though pumped up profile view full vertical scale youre going have profile fuselage big might well add extra inch make scale correct stabilizer elevator slightly increased per info Ron 74 Model Aviation Harding also source airfoil trailing edge sweep flap size modest wing area 600 sq enough job large greatly affected wind biggest benefit semiscale Stunter though lot fun fly As stated earlier sidewinder engine mount intended utilize everpresent centrifugal force keep plug free oil promote better ignition seemed recall reading several years back Rich Porter found better perform ance /2A Stunters jug facing inboard figured might worth try 60 also problem experiencing just something learned live long time time using ST 60 1 couldnt successfully run full 14-6 prop knew 60 power turn just couldnt run engine slowly enough get lap times down flyable speed plane sitting ground estimated needed turning about 7000 rpm achieve proper airspeed However backed needle out ground would get down about 7500 rpm just fall off very rough hit-and-miss stumbling idle Sometimes would get off ground running fairly slowly have engine sud denly flameout die bottom inside square Consequently several years best results 14-5 Zingers really little less 5-in pitch en gine runs fast enough prop stay warm keep plug lit Although isnt bad engine-prop combination doesnt have top 20 sound felt running just fast enough break little too much stay just little too long down backside figure turning loose just little bit too much power could live it nuisance have engine run either bit too much power too little power figured probably better off too much Ive also experience 12 13-in props Yes help problem once youve felt bite big 14-in props pull up wingover wind cant go back Actually nice smooth run ST 60 calm days 12-6 Top Flite Power Prop great tried propylene oxide fuel nitro less oil purer alcohol different plugsall no luck Finally pulled engine out plane put test stand fired up surprise would idle beautifully down 5000 rpm plane wouldnt go below 7500 rpm dawned on test stand cylinder pointing up gravity clean ing plug plane jug verted Whether its oil fuel what foul ing plug Im convinced idle engine definitely affected inverted-engine configuration Looking back getting good run upright flight part though would slightly stumble now again would take same plane pull over inverted engine never missed tick way round circle also noticed scoring better outside maneuvers insides An outside fig ure also develops G-forces clean inverted cylinder outside figures top 20 sound constant power setting way around break getting insides causing power December 1983 75 Profile Bearcat great competitor Although far contemporary standards respect areas moments planes shortcoupled configuration allows bobble-free square corners Lead-outs adjustable obtaining proper line tension under different flying conditions front lead-out up-line plane covered Top Flite FabriKote Lite painted K&B Super Poxy Left Landing gear doors cut 032-in plastic sheet long landing gear provides realistic main-gear landings takeoffs Dihed ral wing adds scalelike impression Right Its definitely profile readily apparent view slab-sided fuselage performs great windy weather Large wing flap area Profile Bearcat also shows nicely view FULL-SIZE PLANS AVAILABLE. SEE PAGE 178 LARDING GEAR LACED TALA 0B SPARS PAPPLITE SOET BALSACr BALSA C E STEErINGEWART WITH SAFT WIRERAP & BATTAR EWIXADMEE AA DASG WEBSIIISEIiOESiilIW A/A A TWEET STABI IELEV SE SPECIAL CATPAPEB COVEBEG DOWEL5/B BALSAFUEL PEASE SEALa-I EBEPPLEB STALE5/B LS MARl WOTOB FIBERGLASS ABBOWPIN ENGINE SB SIN VIA PLY OSUBLEBSILW MW ISOSIC-TASSICS PHOENIX ETE TAAGS TOPL S COOBS--I-CONTROL SABPACE SISGES BUWB SWEAR TOADUWIDDEST FLAW MODEL AVIATION I/IN MASIC WIRE ILE BEARCAT DIGMABED SEEDS-GABSAL PBSS/TA PLOWOOGUOBSDESIGBED S DRAWN BY FRANK WILLIAMS WIBSELSTAILWOEEL MOUNT AlA TAILOREELTRACING BY 70E DEMARCO ALL RIMMYN MESERVEB surge producing irregular shapes stumbling upright flight Ive since told may voids pockets between sleeve case bypass area engine fill up raw fuel spill onto plug Somehow fits fact using ST 60 standard inverted configuration must locate tank centerline about e spraybar achieve satisfactory run both insides outsides might add curious fact Im told OS Max FSR engines just opposite needing tank located low respect spraybar used Stunt ships drawback sidewinder mount its special care must taken assure plumbing tank venturi stays close engine What usually happens profile engine mounted Control Line Airplane engine will burp rich accelerating direction lean other simply caused fact fuel line comes venturi top bot tom As airplane accelerates direc tion fuel line engine momentarily sags rich airplane pulls up away line engine peaks lean apparent square corners best way minimize effects keep fuel line close engine centerline pos sible An alternate technique works well bring fuel line around cyl inder side pass behind ven turi connect venturi opposite side places line fuel close needle valve seat both above below Slow Combat planes utilize technique tank tubing configuration shown plans what currently use have found quite satisfactory recognize New Jersey other East Coast fliers using ST 60 Lincoln Nats very impressive seemed have no problem inverted mount Maybe its just high humidity Houston live know though can now run big prop down speed flyable whereas before wasnt able think lower power setting attainable probably beneficial windy conditions As luck would have though after being very few fliers out practicing Sunday Monday Tuesday stiff winds Lincoln 1982 Nats flew first Continued page 172 Left Supertigre 60 engine 295-in venturi completely exposed easy adjustments Same goes 8-oz clunk tank RC Quik Links flap horn allow adjusting flap/elevator movement ratio Right Panel line detailing white India ink applied technical drafting pen aid flexible straightedge greatly improved appearance makes work very worthwhile photos author 76 Model Aviation OS FS 40 OS ES 60 OS ES 75 OS ES 120T. ENVA 40-40 ENYA 60-40 ENYA 90-40 SAITO3O SAITO 40-Il 5A1T045 SAITO9OT 4-STROKE ENGINE SALE COMPARE & SAVE 8950 12500 14500 34900 12950 14950 18950 8450 9950 10950 29950 TERMS Prepaid check money order lncludeS25OforUPS street address Calif residents add 6% sales tax No credit cards please Allow 2 weeks delivery REDWOOD hobby imports RO B0X6171 SANTA ROSA CALIF 95401 Subject stack hand 0 E2J Inc High performance model engine connecting rods Dealer inquiries invited connecting rods made best materials available designed give long service eliminate rod breakage modern high-Perfor mance model engines Used leading aircraft boat car racers end hobbyists Rods available foe popular modal engines Look RPM foe new innovative products proven performance records Richardson Precision Machining Inc 5070 Gotden Dr. San Jose CA 9612914081257-7068 tell series being guided large extent much on-field experience fellow fliers problems questions persons have called written questions have read various magazines Since biggest con cerns over what may have unin tentionally missed inadequately covered innocently confused again invite say Bob Kopski 25 West End Dr Lans dale PA 19446 Now really import address SEAM Society Electric Aircraft Modelers national organization dedicated ad vancement electric-powered model fly ing SEAM newsletter contains much information about things Electricnews views how-tos Membership mere 10 bucks under 16 Junior $5 Write SEAM 11632 Flamingo Dr Garden Grove CA 92644 course AMA mem bership required Profile Bearcat/Williams Continued paqe 76 qualifying flight Wednesday condi tions Stunt fliers dread thing elseabsolute dead calm jig tubes including leading trailing edge sheeting center section sheeting landing gear installation installation bellcrank leadouts After wing construc tion complete tubes carefully re moved tip blocks added balsa use must 4 6-lb range trailing edge spar cut -in sheet table saw radial arm saw trailing edge sheeting purposefully over hangs back spar sandpapercovered dowel used achieve con cave shape trailing edge produces somewhat tighter aero dynamically cleaner hinge line nor mally attained counterlever hinges noted plans key making setup work correctly flaps made -in sheet center rotation flaps center flap leading edge diameter same technique used stabilizer elevator flap horn simply bent proper shape conform dihedral trailing edge sweep know seems motion arms will too unplane useful works out-of-plane motion taken up brass tubes inset flaps tube Vt id flattened over flap horn arm oval shape flap assembled usually fill tube aquarium sealer fule-proofer aquarium sealer will stay flexible life plane Actually planes trailing edge sweep no dihedral just make proper bend horn solidly affix arms flaps works fine no bind whatsoever fuselage can get too heavy youre careful lightening holes must Its bigger chunk wood might think prepared also shock big slabs perched atop wing Seldom does wife comment about Stunt ships during construction stage Sometimes after completed get Oh thats nice shade blue doesnt have pilot wife confronted morning after cut out profile fuselage mounted atop wing What heavens name ing out year entire airplane covered Top though profile airplane Im sure would classify novice project mainly because wing dihedral wing must built jig tubes' As far Im concerned method way build wing whether has dihedral jig tubes assure straight warp-free wing imperative Stunt ship plane wont work dihedral either wont look right thing di hedral needed get lead-outs up CG airplane Dont influenced say plane dihedral wont turn same inside outside Taint talking about 30 performance good straight-wing ship cant find aluminum tubes hardware stores have solid -in aluminum rod works just well tubes supported leveled both tips also center section wing completely constructed Flite FabriKote Lite component 172 Model Aviation Monocoupe 90A 1/4 scale Send $200 br Catalog Ikon NWST Dept MA PO Box 566 Auburn WA 98002 206 941-8248 sV H 2 Wing Span--iti Wing Area 566 Sq 2 SENSOAR glider HOBBY HORN Eaclusive 1 HOBBY HORN Kit SENSOAR Glider kit isa high quality kit Machine cut ed parts Select quality balsa spruce Detailed plans written instructions THERMAL SLOPE 05 ELECTRIC POWER VALUE PRICED 51600 _____________ 5ull artist Kits P & W Semi-Kits Combined full plan Now mel Wire tfindose etc Mat Note may purchased just sem kits planswrite colt prices 1936 Baeeaoeer54-$St 1038 CSpper MR l72-$39 1937 l3attaim SptsertOt$0t 1940 Raoger46- $27 1939 Mereury-72--S36 1931 Miss Amer ea-04---5S9 1941 Playboy Jrt4929 1045 Playbsy SrtO046 1938 Power House04-$43 1940 Sailplsoe7t- $74 tt4t So Long-50-$l0 1038 Treoton Terror-73-$32 1938 ZiperS4-S4t 1039 Korda Wakefield-44 $17 MIDWAY MODEL CO SemI-kits Combined v/strip 1936 Flying Quaker-54$40 1937 Qualser Ftash07$3t 1937 tong Cabin70nS42 1937 Air Chieff 40 TRUCKS194079Span835Sqin .ew ruler Combo tFulll Kit$0300 SCALE PLANS end 0RAWING SSt HEINKEL HEmOD 62 60s $1000 SHIPPING AND HANDLING 5t AL US up $800 add $150 $200 PP/lot Class $001 $3090 add $225 copy mitt sent $2001 $4100 odd $300 freewhen requested$4591 $7000 odd $310 order over $7000 sdd $400 BY HORN CA Addressees add 0% taX 0hobby specialties Send 510 Visa/MCt#Exp15173 Moran Street IA] Check tallow up 30 Box 2212 days check clearanceWestminster Ca 92603 CODExact Charges 893-8311 Hdt Cash OnlvtAU UPS] t 0951203 Hobby Swap News THE MODEL ENTHUSIAST MUSED EOUIPMENT GUIDE Buy other modelers save 50% morel used equipment bargains other publication free ad comes new ssbscription Nama Ad draaa City & clara E 1 yr 3rd class 510 fl 1 yr class $13 send suOscflyrlor orders ard Oaw 80 Hobby swap Saws Owpl H PC sos 22090 Oar 5mw CA 921220090 covered separately before joined together FabriKote heat-shrinkable nice covering compound curves finished product after two three coats K&B Superpoxy clear fill weaver looks like have covered plane silk dope nice thing about heat shrinked materials evening work can go raw balsa surface will never ever fall back grain wood weight FabriKote isnt bad either raw material cover top bottom 600 sq wing flaps 19 oz after three sprayed coats K&B clear 33 oz again might just use regular Fabri Kote Navy blue color eliminate clear filling coats use epoxy paints produce fine finish thing quite durable Mainly though Im about mile Galveston Bay about four days year can use dope ter rible blushing problems drawback FabriKote its stuff doesnt sand fore seams should kept under side plane seams vis ible like tips must dealt using primer build up ramp low side feathered smooth Navy blue color one-to-one mix K&B blue black Jim Lynch noted Bearcat builder flier once told hes never seen two Bearcats same color one-to-one mix looks mighty dark workshop out day light blue comes through white panel lines white India ink drawn drafting pens white ink usually doesnt want work well black ink tends bead up problem can alleviated adding drop two liquid detergent ink pen reservoir final weight Profile Bearcat 59 oz heavy Actually pro file fuselage really doesnt have much less material built-up So far no ever accused being light builder either Mainly though used 46 instead 60 would have weighed 56 oznot bad weight might say choice between 56-oz place Fine Quality Flying Models Catalog Si 50 98 RUBBER POWER KITS plus Gliders CIL R/C Accessories Books , 4 MAJESTIC MODELS 3273 West 129th Street Cleveland Ohio 44111 46 59-oz plane 60 Ill take 60 time Horsepower addictive Aerodynamically what does tall fuse lage airplanes performance Does solve some line-tension problems overhead sure doesnt hurt can get plane yawed out too much though itll tend block tail somewhat shadow outboard wing Also glide after en gine shutdown will df one-half lap best performance has leadouts fairly far forward experience some buffeting breezy days level flight result assume vortices rolling off relatively sharp edges fuselage Profile Bearcats maiden contest out ing July 4th Ft Worth Semiscale model-flying Stunt pros Al Rabe Frank MeMillian attendance plane about dozen test flights day quite windy However per formed beautifully Whereas others getting blown out pattern Profile Bearcat chugged along very steady 57-sec lap times rock-solid line ten sion think everyone impressed its performance Ive always thought profile Stunt ships have sold short flying abilities intermediate advanced-level fliers spend too much time effort building ultimate fullfuselage Stunter overlooking benefits quickly building profile will time flying Will sidewinder engine mount semiscale profile airplanes revolutionize Stunt flying Probably does work quite well lot fun fly feel like youre rut usual yearafter-year classic Stunter want try something bit out ordinary consider Profile Bearcat may just plane need Miniatures/ODwyer Continued pane 85 doesnt break easily best Wood selection very important working size softer woods will break away come thin regions December 1983 173 4 4 Designed RIC Combat agile little performer can fly rings around airplane youve ever owned youre looking really spirited responsive aircraft thats easier build fly Warbird exactly what need 3 Channel RIC 19 25 36 Span Mixer Included $3495 OWBIRD bird big gest best has rock steady pat tern performance thats amazing because will rolls straight up out sight sfock K & B 40 slows down like glider landing 64 inches beautiful flying wing will make look great field Precision kit 25 40 engine 7 feel rolled plans $5995 See dealer first send check money order Pacific Air 15 Skyline Drive Woodside CA 94062 Power Soar New Heights LT-50 Electric Motor 01 Cu equivelent gas engine displacement Send self-addressed stamped envelope catalog ap plication notes Leisure 11 Deerspring/lrvinelCA 92714

IF NECESSITY mother invention Profile Bearcat born need flying engine testbed exercise merits rather wild idea about engine performance Stunt ship wanted test engine mounted profile posi tion standard profile setup engine mounted facing outboard wanted cylinder facing inside circle As will try explain later felt performance engine being adversely affected standard Stunt ships inverted mount inboard cylinder placement let centrifugal force keep glow plug free oil thus promote better ignition characteristics hopefully better Stunt run came about end 1981 flying season felt needed steadier en gine run getting Oh plenty power ST 60 1 running power spare really just wasnt sounding like engines top 20 fliers Seguin Nats ear top 20 sound round maneuvers rarely breaks alla solid four-cycle way around four years running ST 60 1 never able run quite manner wanted able run big prop real slowly full built-up fuselage testbed airplane out question needed airplane would fairly quick build knew flew well impor tantly easy access engine tank associated plumbing pro file Since can muster enough energy undertake Stunt ship year risking whole season something might work 1978 built full-blown molded fuselage Rabe Bearcat about 56 oz ST 46 power sported nice enough finish receive 16 appearance points Lake Charles Nats summer plane flew great Unfortunately wasn t its equal seriously flying Stunt two three years time performance good first Nats satisfied Stunt ships Ive flown Bearcat different No other plane has shown inherent well-damped dynamic response Bearcat possesses will fly out hard corner trace bobble overshoot No matter hard 4 pur r hit corner just turns lays have always felt Bearcat has benefitted its short nose tail lengths resulting lower-than-normal pitch inertia feel lower pitch ertia comparison todays Stunters contributes superior damping pitch Bearcat possesses Also fluencing pitch dynamics items like Bearcats flap size impor tantly CG placement rearward CG can located better pitch damping up point course must coordinated line spacings con trol throw etc achieve perfect feel several years wanting try another Bearcat testbed profile tall fuselage would hide muf fler exhaust stack would pointing up instead out inboard side rea soned Profile Bearcat basically copy Rabe Bearcat though pumped up profile view full vertical scale youre going have profile fuselage big might well add extra inch make scale correct stabilizer elevator slightly increased per info Ron 74 Model Aviation Harding also source airfoil trailing edge sweep flap size modest wing area 600 sq enough job large greatly affected wind biggest benefit semiscale Stunter though lot fun fly As stated earlier sidewinder engine mount intended utilize everpresent centrifugal force keep plug free oil promote better ignition seemed recall reading several years back Rich Porter found better perform ance /2A Stunters jug facing inboard figured might worth try 60 also problem experiencing just something learned live long time time using ST 60 1 couldnt successfully run full 14-6 prop knew 60 power turn just couldnt run engine slowly enough get lap times down flyable speed plane sitting ground estimated needed turning about 7000 rpm achieve proper airspeed However backed needle out ground would get down about 7500 rpm just fall off very rough hit-and-miss stumbling idle Sometimes would get off ground running fairly slowly have engine sud denly flameout die bottom inside square Consequently several years best results 14-5 Zingers really little less 5-in pitch en gine runs fast enough prop stay warm keep plug lit Although isnt bad engine-prop combination doesnt have top 20 sound felt running just fast enough break little too much stay just little too long down backside figure turning loose just little bit too much power could live it nuisance have engine run either bit too much power too little power figured probably better off too much Ive also experience 12 13-in props Yes help problem once youve felt bite big 14-in props pull up wingover wind cant go back Actually nice smooth run ST 60 calm days 12-6 Top Flite Power Prop great tried propylene oxide fuel nitro less oil purer alcohol different plugsall no luck Finally pulled engine out plane put test stand fired up surprise would idle beautifully down 5000 rpm plane wouldnt go below 7500 rpm dawned on test stand cylinder pointing up gravity clean ing plug plane jug verted Whether its oil fuel what foul ing plug Im convinced idle engine definitely affected inverted-engine configuration Looking back getting good run upright flight part though would slightly stumble now again would take same plane pull over inverted engine never missed tick way round circle also noticed scoring better outside maneuvers insides An outside fig ure also develops G-forces clean inverted cylinder outside figures top 20 sound constant power setting way around break getting insides causing power December 1983 75 Profile Bearcat great competitor Although far contemporary standards respect areas moments planes shortcoupled configuration allows bobble-free square corners Lead-outs adjustable obtaining proper line tension under different flying conditions front lead-out up-line plane covered Top Flite FabriKote Lite painted K&B Super Poxy Left Landing gear doors cut 032-in plastic sheet long landing gear provides realistic main-gear landings takeoffs Dihed ral wing adds scalelike impression Right Its definitely profile readily apparent view slab-sided fuselage performs great windy weather Large wing flap area Profile Bearcat also shows nicely view FULL-SIZE PLANS AVAILABLE. SEE PAGE 178 LARDING GEAR LACED TALA 0B SPARS PAPPLITE SOET BALSACr BALSA C E STEErINGEWART WITH SAFT WIRERAP & BATTAR EWIXADMEE AA DASG WEBSIIISEIiOESiilIW A/A A TWEET STABI IELEV SE SPECIAL CATPAPEB COVEBEG DOWEL5/B BALSAFUEL PEASE SEALa-I EBEPPLEB STALE5/B LS MARl WOTOB FIBERGLASS ABBOWPIN ENGINE SB SIN VIA PLY OSUBLEBSILW MW ISOSIC-TASSICS PHOENIX ETE TAAGS TOPL S COOBS--I-CONTROL SABPACE SISGES BUWB SWEAR TOADUWIDDEST FLAW MODEL AVIATION I/IN MASIC WIRE ILE BEARCAT DIGMABED SEEDS-GABSAL PBSS/TA PLOWOOGUOBSDESIGBED S DRAWN BY FRANK WILLIAMS WIBSELSTAILWOEEL MOUNT AlA TAILOREELTRACING BY 70E DEMARCO ALL RIMMYN MESERVEB surge producing irregular shapes stumbling upright flight Ive since told may voids pockets between sleeve case bypass area engine fill up raw fuel spill onto plug Somehow fits fact using ST 60 standard inverted configuration must locate tank centerline about e spraybar achieve satisfactory run both insides outsides might add curious fact Im told OS Max FSR engines just opposite needing tank located low respect spraybar used Stunt ships drawback sidewinder mount its special care must taken assure plumbing tank venturi stays close engine What usually happens profile engine mounted Control Line Airplane engine will burp rich accelerating direction lean other simply caused fact fuel line comes venturi top bot tom As airplane accelerates direc tion fuel line engine momentarily sags rich airplane pulls up away line engine peaks lean apparent square corners best way minimize effects keep fuel line close engine centerline pos sible An alternate technique works well bring fuel line around cyl inder side pass behind ven turi connect venturi opposite side places line fuel close needle valve seat both above below Slow Combat planes utilize technique tank tubing configuration shown plans what currently use have found quite satisfactory recognize New Jersey other East Coast fliers using ST 60 Lincoln Nats very impressive seemed have no problem inverted mount Maybe its just high humidity Houston live know though can now run big prop down speed flyable whereas before wasnt able think lower power setting attainable probably beneficial windy conditions As luck would have though after being very few fliers out practicing Sunday Monday Tuesday stiff winds Lincoln 1982 Nats flew first Continued page 172 Left Supertigre 60 engine 295-in venturi completely exposed easy adjustments Same goes 8-oz clunk tank RC Quik Links flap horn allow adjusting flap/elevator movement ratio Right Panel line detailing white India ink applied technical drafting pen aid flexible straightedge greatly improved appearance makes work very worthwhile photos author 76 Model Aviation OS FS 40 OS ES 60 OS ES 75 OS ES 120T. ENVA 40-40 ENYA 60-40 ENYA 90-40 SAITO3O SAITO 40-Il 5A1T045 SAITO9OT 4-STROKE ENGINE SALE COMPARE & SAVE 8950 12500 14500 34900 12950 14950 18950 8450 9950 10950 29950 TERMS Prepaid check money order lncludeS25OforUPS street address Calif residents add 6% sales tax No credit cards please Allow 2 weeks delivery REDWOOD hobby imports RO B0X6171 SANTA ROSA CALIF 95401 Subject stack hand 0 E2J Inc High performance model engine connecting rods Dealer inquiries invited connecting rods made best materials available designed give long service eliminate rod breakage modern high-Perfor mance model engines Used leading aircraft boat car racers end hobbyists Rods available foe popular modal engines Look RPM foe new innovative products proven performance records Richardson Precision Machining Inc 5070 Gotden Dr. San Jose CA 9612914081257-7068 tell series being guided large extent much on-field experience fellow fliers problems questions persons have called written questions have read various magazines Since biggest con cerns over what may have unin tentionally missed inadequately covered innocently confused again invite say Bob Kopski 25 West End Dr Lans dale PA 19446 Now really import address SEAM Society Electric Aircraft Modelers national organization dedicated ad vancement electric-powered model fly ing SEAM newsletter contains much information about things Electricnews views how-tos Membership mere 10 bucks under 16 Junior $5 Write SEAM 11632 Flamingo Dr Garden Grove CA 92644 course AMA mem bership required Profile Bearcat/Williams Continued paqe 76 qualifying flight Wednesday condi tions Stunt fliers dread thing elseabsolute dead calm jig tubes including leading trailing edge sheeting center section sheeting landing gear installation installation bellcrank leadouts After wing construc tion complete tubes carefully re moved tip blocks added balsa use must 4 6-lb range trailing edge spar cut -in sheet table saw radial arm saw trailing edge sheeting purposefully over hangs back spar sandpapercovered dowel used achieve con cave shape trailing edge produces somewhat tighter aero dynamically cleaner hinge line nor mally attained counterlever hinges noted plans key making setup work correctly flaps made -in sheet center rotation flaps center flap leading edge diameter same technique used stabilizer elevator flap horn simply bent proper shape conform dihedral trailing edge sweep know seems motion arms will too unplane useful works out-of-plane motion taken up brass tubes inset flaps tube Vt id flattened over flap horn arm oval shape flap assembled usually fill tube aquarium sealer fule-proofer aquarium sealer will stay flexible life plane Actually planes trailing edge sweep no dihedral just make proper bend horn solidly affix arms flaps works fine no bind whatsoever fuselage can get too heavy youre careful lightening holes must Its bigger chunk wood might think prepared also shock big slabs perched atop wing Seldom does wife comment about Stunt ships during construction stage Sometimes after completed get Oh thats nice shade blue doesnt have pilot wife confronted morning after cut out profile fuselage mounted atop wing What heavens name ing out year entire airplane covered Top though profile airplane Im sure would classify novice project mainly because wing dihedral wing must built jig tubes' As far Im concerned method way build wing whether has dihedral jig tubes assure straight warp-free wing imperative Stunt ship plane wont work dihedral either wont look right thing di hedral needed get lead-outs up CG airplane Dont influenced say plane dihedral wont turn same inside outside Taint talking about 30 performance good straight-wing ship cant find aluminum tubes hardware stores have solid -in aluminum rod works just well tubes supported leveled both tips also center section wing completely constructed Flite FabriKote Lite component 172 Model Aviation Monocoupe 90A 1/4 scale Send $200 br Catalog Ikon NWST Dept MA PO Box 566 Auburn WA 98002 206 941-8248 sV H 2 Wing Span--iti Wing Area 566 Sq 2 SENSOAR glider HOBBY HORN Eaclusive 1 HOBBY HORN Kit SENSOAR Glider kit isa high quality kit Machine cut ed parts Select quality balsa spruce Detailed plans written instructions THERMAL SLOPE 05 ELECTRIC POWER VALUE PRICED 51600 _____________ 5ull artist Kits P & W Semi-Kits Combined full plan Now mel Wire tfindose etc Mat Note may purchased just sem kits planswrite colt prices 1936 Baeeaoeer54-$St 1038 CSpper MR l72-$39 1937 l3attaim SptsertOt$0t 1940 Raoger46- $27 1939 Mereury-72--S36 1931 Miss Amer ea-04---5S9 1941 Playboy Jrt4929 1045 Playbsy SrtO046 1938 Power House04-$43 1940 Sailplsoe7t- $74 tt4t So Long-50-$l0 1038 Treoton Terror-73-$32 1938 ZiperS4-S4t 1039 Korda Wakefield-44 $17 MIDWAY MODEL CO SemI-kits Combined v/strip 1936 Flying Quaker-54$40 1937 Qualser Ftash07$3t 1937 tong Cabin70nS42 1937 Air Chieff 40 TRUCKS194079Span835Sqin .ew ruler Combo tFulll Kit$0300 SCALE PLANS end 0RAWING SSt HEINKEL HEmOD 62 60s $1000 SHIPPING AND HANDLING 5t AL US up $800 add $150 $200 PP/lot Class $001 $3090 add $225 copy mitt sent $2001 $4100 odd $300 freewhen requested$4591 $7000 odd $310 order over $7000 sdd $400 BY HORN CA Addressees add 0% taX 0hobby specialties Send 510 Visa/MCt#Exp15173 Moran Street IA] Check tallow up 30 Box 2212 days check clearanceWestminster Ca 92603 CODExact Charges 893-8311 Hdt Cash OnlvtAU UPS] t 0951203 Hobby Swap News THE MODEL ENTHUSIAST MUSED EOUIPMENT GUIDE Buy other modelers save 50% morel used equipment bargains other publication free ad comes new ssbscription Nama Ad draaa City & clara E 1 yr 3rd class 510 fl 1 yr class $13 send suOscflyrlor orders ard Oaw 80 Hobby swap Saws Owpl H PC sos 22090 Oar 5mw CA 921220090 covered separately before joined together FabriKote heat-shrinkable nice covering compound curves finished product after two three coats K&B Superpoxy clear fill weaver looks like have covered plane silk dope nice thing about heat shrinked materials evening work can go raw balsa surface will never ever fall back grain wood weight FabriKote isnt bad either raw material cover top bottom 600 sq wing flaps 19 oz after three sprayed coats K&B clear 33 oz again might just use regular Fabri Kote Navy blue color eliminate clear filling coats use epoxy paints produce fine finish thing quite durable Mainly though Im about mile Galveston Bay about four days year can use dope ter rible blushing problems drawback FabriKote its stuff doesnt sand fore seams should kept under side plane seams vis ible like tips must dealt using primer build up ramp low side feathered smooth Navy blue color one-to-one mix K&B blue black Jim Lynch noted Bearcat builder flier once told hes never seen two Bearcats same color one-to-one mix looks mighty dark workshop out day light blue comes through white panel lines white India ink drawn drafting pens white ink usually doesnt want work well black ink tends bead up problem can alleviated adding drop two liquid detergent ink pen reservoir final weight Profile Bearcat 59 oz heavy Actually pro file fuselage really doesnt have much less material built-up So far no ever accused being light builder either Mainly though used 46 instead 60 would have weighed 56 oznot bad weight might say choice between 56-oz place Fine Quality Flying Models Catalog Si 50 98 RUBBER POWER KITS plus Gliders CIL R/C Accessories Books , 4 MAJESTIC MODELS 3273 West 129th Street Cleveland Ohio 44111 46 59-oz plane 60 Ill take 60 time Horsepower addictive Aerodynamically what does tall fuse lage airplanes performance Does solve some line-tension problems overhead sure doesnt hurt can get plane yawed out too much though itll tend block tail somewhat shadow outboard wing Also glide after en gine shutdown will df one-half lap best performance has leadouts fairly far forward experience some buffeting breezy days level flight result assume vortices rolling off relatively sharp edges fuselage Profile Bearcats maiden contest out ing July 4th Ft Worth Semiscale model-flying Stunt pros Al Rabe Frank MeMillian attendance plane about dozen test flights day quite windy However per formed beautifully Whereas others getting blown out pattern Profile Bearcat chugged along very steady 57-sec lap times rock-solid line ten sion think everyone impressed its performance Ive always thought profile Stunt ships have sold short flying abilities intermediate advanced-level fliers spend too much time effort building ultimate fullfuselage Stunter overlooking benefits quickly building profile will time flying Will sidewinder engine mount semiscale profile airplanes revolutionize Stunt flying Probably does work quite well lot fun fly feel like youre rut usual yearafter-year classic Stunter want try something bit out ordinary consider Profile Bearcat may just plane need Miniatures/ODwyer Continued pane 85 doesnt break easily best Wood selection very important working size softer woods will break away come thin regions December 1983 173 4 4 Designed RIC Combat agile little performer can fly rings around airplane youve ever owned youre looking really spirited responsive aircraft thats easier build fly Warbird exactly what need 3 Channel RIC 19 25 36 Span Mixer Included $3495 OWBIRD bird big gest best has rock steady pat tern performance thats amazing because will rolls straight up out sight sfock K & B 40 slows down like glider landing 64 inches beautiful flying wing will make look great field Precision kit 25 40 engine 7 feel rolled plans $5995 See dealer first send check money order Pacific Air 15 Skyline Drive Woodside CA 94062 Power Soar New Heights LT-50 Electric Motor 01 Cu equivelent gas engine displacement Send self-addressed stamped envelope catalog ap plication notes Leisure 11 Deerspring/lrvinelCA 92714