SCALE Bob & Dolly Wischer SERVO Sizes present trend toward larger scale models necessarily -scale always question skeptical builders minds need heavy-duty servos Except recent plane deHavilland 71 racer have using standard 29 oz-in servos deH uses Ace Bantam Midgets built kits have output 17 oz- flies very high speed far too fast scale realism has large control surfaces Its flight suffers no ill effects use small servos Jan 80 column asked reader comments use small servos large planes Bob Munn answered follows question about using regular servos -scale aircraft hit tender place happen believe big does neces sarily mean heavy turn means horsepower turn requires heavier build ing etc until end have 22-lb Piper Cub J-3 Quadra flies like Uglier Stik have built four -scale aircraft have used standard Kraft KPS-14 servos according Kraft literature deliver modest 17 oz-in torque No problems what soever long linkages clean free enough surface will drop its own weight linkage disconnected servo end have found some interesting things course making different installations some may help interest first large plane actually scale 2000 sq biplane designed Dave Boddington called Bi- Stormer monster Finished Silron butyrate dope weighed 10 lbs powered Profi 76 truly great engine 11000 rpm 14-6 no-nitro fuel lovely throttle plane used fiberglass arrow shafts empennage supported loose fitting hole light plywood former about half way back minimize lateral vibrations Regular Klett hinges Fully aerobatic never stripped gear problem Ailerons linked through bellcranks 1/16 wire running through very short lengths nylon tubing about 8 apart wing ribs center section short length wire soldered main link carried clevis servo Using connected ailerons automatically provides static balance aileron mass servo works against airstream Second plane Nosen Aeronca also using KPS-1411 servos linkages very much above Third Nosen Citabria differed tail surfaces aerodynam ically balanced plane now four years old still going strong though now using British Sky-Leader servos also standard torques aileron linkage still uses servo center section linkage aileron independent hooking together servo out put wheeL Ailerons use Graupner offset hinges tail surfaces also Graupner Fourth Nosen less mostly less Piper J-3 weighing 12Y4 lbs another Profi 76 butyrate over Silron Tail surface hinges Enterprise molded glass alittlebitofa pain install very strong Pushrods tail 3/16 dowel wire ends attached per old fashioned thread Duco rubbed run through two supports made ions Gold-n-rod outerblue tube Again simply avoid unwanted lateral move ments rods slide very freely must line up rod control arm servo attach point very carefully before cover ing airframe virtually no drag aileron has its own KPS-14 servo mounted right next center section rib no extension wiring other Y connection receiver aileron required hence no RE prob lems servo works through bellcrank connecting linkage comprises very short wire ends thread wrapped Ducoed l supported two intermediate places very short pieces nylon tubing No slop linkage virtually no weight added aileron itself debated about counterbalancing ailerons since worked independently weight servo gear rest have no indication about 40 flights really problem Unless has horribly nose-heavy beast intend flatten out monstrous terminal velocity dive some very serious Continued page 110 April 1980 29 Precision scale pIttire torn Lietericfl i-ranK vaflS span model weighs 9 lb. powered Merco 61 Finish Testors enamel final flat coat Hobbypoxy clear 1-lowara reiin mauc nis lop rimie r-Qu repiica 01 LIlal U Confederate Air Force Model weighs 10 lb finished acrylic over Coverite Dave Axford anchors Dave Henshaws Quadra-powered VanGrunsven RV 3 K-W Rally plane becoming favorite subject modeling since won efficiency award Larry Scott built Suevia- powered Great Lakes scratch Model fea tures on- board ignition fiberglass cowl Eighteen pound model needs 15 cu engine Finish lacquer primer acrylic enamel over basic Coverite produce questions answers would like hear comments Ill have next month Bob Beckman 8248 Holly Grove Ct Manassas VA 22110 RC Scale/Wischers Continued page 29 vibration problems cannot see -scale aircraft flown anything resembling scaletype flight comparative stresses cant controlled normal servos delivering some around 20 oz-in believe since l stiff wire much lighter RF associations can used quite successfully control pushrods provided supported 8 10 intervals carefully aligned nylon comparable slick guides prevent lateral movement type connec tion also minimizes weight respects tends dampen vibration better using heavier unsupported pushrod Bob Munns accomplishments frictionfree light-weight pushrods provide ideas will helpful sizes scale planes use standard servos planes up nine-foot span would indicate have power spare exception may servo driving large area flaps down 450 angle may require some extra energy particularly friction losses linkage Scale Details Inquiries regarding gathering information needed finish scale kit constantly reaching mailbox isnt easy inform someone should have started good scale drawing stack sharp photos before bought kit proper sequence Questions nature usually arise because kit buyer new scale has purchased kits past trainer-type models found kit box contain needed though some scale kits include three-view drawing additional information build model specific aircraft often required Kit infor mation may sufficient build model general outlines colors aircraft type builder dissatisfied ordinary perhaps because has seen well finished models photos comes awareness lacking information have asked list purchased scale goodies select parts can assembled kit making modeling assembly task rather building job Actually Sig Ace catalogs contain large portion available items market list sorts already exists regrettable builder wants top quality model specific airplane will find items useable original purchased condition Everything depends upon degree authen ticity desired Sport Scale modelers have definite advantage being willing accept ready-made parts necessarily perfect application Choosing model subject basis available data useable purchased parts would surest course action Preferred scale drawings should have sufficient detail remove doubts about such items control surface hinge point locations landing gear motion retract able Determine whether commercial retract mechanisms can employed Wheels swing through arc greater 900 may require machining parts beyond modelers capacity change design reduces scale accuracy decision must made whether loss accuracy acceptable may Sport Scale builders modeler searching ultimate detail will find quality suffers compro mises must made shape form structure accommodate use ready made parts Hinges example available profusion shapes sizes Possibly way can found use true scale hinging usually has pivot centers such position sacrifice scale appearance operation inevitable Wheels tires eyesore too otherwise excellent scale planes Too large too small wrong proportion hub tire size conspicuous error tread pattern also contributes lack authenticity Reliable scale data form drawings clear photos hand before starting construction will warn wheels can problem though have large number select have rejected some attractive prototypes because authentic wheels available exact diameter wheels cant found itis bestto err large side Research regarded boring ancillary art scale modeling Others dis like writing begging letters possible data sources Too us live relative isolation fellow modelers may come forth helpful information about choice subject Groups clubs specialize scale can assist another As research aid National Association Scale Modelers NASA has compiled Scale Date Source List its members list narrows down number places would need write specific information Some information can found columns such data becomes lost future reference unless reader clips item Mem bership dues NASA $500 annually Address inquiries Robert Underwood 4109 Concord Oaks Drive St Louis MO 63128 list contains government agencies com mercial sources drawings photographs some museum aircraft personal viewing study What may largest collection aircraft photo negatives possession Peter Bowers Peter has able answer inquiries because time required operate photo business prints several hundred thousand negatives can obtained through Castle Graphics PO Box D Green bank WA98253 Prices are$250 for8 x 10 $175 5 x 8 single weight glossy black white with$ 100 additional first class postage Like photo sources will necessary quite specific inquiring value photos should halftone magazine book types magnifying glass used 110 Model Aviation BLADES JET RANGER .. C0MMA~W HELl BOBCO parts fa ry CO~ ER 5 parts buta parts5REt51JTION1 rite for~ANSHRLJ 40 and$795 HavRICAN KAVAN Helicoptors parts DISCOUNT PRICES DEALER PRO5KMS ENCOURAGED10% Discount 5 Sets CA residents add 6% Sales tax173 Sunset Dr No2 add $150 postage & handlingDEJUCO check moncy order toVista CA 92083 Winning Ideas FOURMOST RETRACTABLE TOW HOOK RELEASE Price $675 Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight Y2 oz OTHER FOURMOST PRODUCTS 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE S250 IDEAL FOR QUICKY 500 PRICE S525Z2ZZ Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming FUR~ST Send SASE Complete Information 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 halftone photo merely enlarges dots really sharp photo can magnified read stenciled legends plane locate panel lines Best source photos modelers camera prototype can found Dedicated researchers travel great distances spend days photographing measuring plane Bob Dolly Wischer RL 1 S-221 Lapham Peak Roa4 Delafiel4 WI 53018 Tigercat/Norman Continued page 32 jig As indicated shape former F-i 2 vertical tail tapered thickness two hori zontal ribs fin cut scrap 1/20 1/16 sheet stock tapered width equal F-12 join down thickness fins leading edge Also contour upper fuselage immediately behind cockpit somewhat rounded sug gested area between formers F-S F-7 filled tapering pieces 1/16 sheet sanded rounded better approximate look full-size aircraft rudder move able part vertical tail built separately Nacelles Using same techniques described constructing fuselage nacelle formers longerons cut assembled masonite jig hold true being assem bled As nacelles mirror other will have flip formers shown plan make left nacelle Component AssembIy wing halves joined fuselage center such way leading edge half wing joined front former F-S main spars meet just behind former F-6 trailing edges join former F-8 will necessary deeply notch F-8 permit trailing edges pass through will also necessary remove portions fuselage stringers block passage main spar approximate dihedral angle has indicated formers F-5 F-6 will help aligning wing halves dihedral full-size aircraft substantial dihedral model approximately 1 rib Once wing halves positioned leading trailing edges main spar meet indicated two halves joined together epoxy Before wing joined fuselage check has approximately two degrees positive incidence use side longeron reference line wing joined per40 AIRFLO ENGINE MOUNT manently fuselage using epoxy scrap balsa fill gaps between wing nearby supporting fuselage formers area between root rib fuselage filled 1/3 2 sheet both strength base adhering tissue covering Similarly 1/32 X p pieces installed following shape airfoil portions fuselage adjacent wing root adds strength also provides suitable base tissue attachment nacelles joined wing position shown plan angled tops formers N-4 N-5 N-6 N-7 aligned underside wing trailing edge epoxied N-7 leading edge joined N-3 shown Once nacelle place fill area between nacelle underside wing rib nearest 1/32 sheet no need put 1/32 sheet fill top surfaces wing except portion tween N-3 turbulator spar Landing Geai- As indicated plan landing gear model optionat Flying Aces Rules permit subjects retractable gear flown wheels up thus eliminating considerable weight drag intend place model static dis play landing gear may desirable realistic base model decide build landing gear suggested make removable flying favorite technique use plug type small receptacles 1 / 16 aluminum tubing placed points main landing gear members meet fuselage nacelles landing gear components fashioned 1/32 wire pins slide aluminum tube receptacles intend use landing gear model suggested build appropriate recep tacles before proceeding covering Covering Coloring wing fuselage assembled using 1/32 sheet fill key points such wing roots etc have strengthened stress areas have provided anchor points tissue covering Almost Tigercats overall dark navy blue prototype color prototype original aircraft silver first F7 Fs tested Patuxent Maryland yellow July 1978 issue Air Classics magazine contains color photos civilian Tigercat silver red white black trim chose mark model green white bands sported Marine Corps F7 F El Toro Marine Base 1946 keeping general design philosophy suggested after shrinking tissue single coat dope applied As no rubber motor passing through fuselage have opportunity install completely detailed cockpit full pilot figure wish intention model pressures completing July 15 16 1978 Flying Aces National Meet dictated use conventional pilot bust carved styrofoam have unable find good detail F7 F cockpit interior fair amount information contained Model Airplane News book Best Nye VoL 3 Also excellent reference scale details may hadbypurchasingthe 1/72 Monogram plastic kit Propellers I used 8 Sterling plastic propellers cut 7 Static three-bladed propellers also made using 7 Sleek Streak props epoxied appropriate angles model will probably fly three-bladed props 112 Model Aviation 6 MODELS TO CHOOSE FROM OUR BEST SELLER THE CARDINAL SPORT - At Dealer snej snOlpststsa ,Sl55 O5uy atSbl5 50 bOlS5SbI It05 5 50 5P4i5Il ,j$OOa As, platis 5ttiSK5ith04df,,50Il0dOd FsOfl,SI O5OSt4 ato Intotti. Sirsto ad ta tfI 55 511dt5I COiai SOdy 51 YOSt 9t 555 COthI hO,. poshtOds t,oOlO 05 stnt sato ftt antOstrtWtO 4 tiittOtSSiflQ IttOtOt eOOtU5 on. 05 Sf545 0S50bI Ittlo 001 nO 554005 OdOSIttIs 50 i5t51155 0 5001055 000015 U. rail 5tSbilOO 00405 0050 s 51. ebsoted tea, Os a, OOse Md 5085044 50 OptS.flInadatiolAol 5 OsoljS5 4-Channel 25-40 Size 83 Wingspan 20-22 Os Loading Vey Aerobadic
Edition: Model Aviation - 1980/04
Page Numbers: 29, 110, 112
SCALE Bob & Dolly Wischer SERVO Sizes present trend toward larger scale models necessarily -scale always question skeptical builders minds need heavy-duty servos Except recent plane deHavilland 71 racer have using standard 29 oz-in servos deH uses Ace Bantam Midgets built kits have output 17 oz- flies very high speed far too fast scale realism has large control surfaces Its flight suffers no ill effects use small servos Jan 80 column asked reader comments use small servos large planes Bob Munn answered follows question about using regular servos -scale aircraft hit tender place happen believe big does neces sarily mean heavy turn means horsepower turn requires heavier build ing etc until end have 22-lb Piper Cub J-3 Quadra flies like Uglier Stik have built four -scale aircraft have used standard Kraft KPS-14 servos according Kraft literature deliver modest 17 oz-in torque No problems what soever long linkages clean free enough surface will drop its own weight linkage disconnected servo end have found some interesting things course making different installations some may help interest first large plane actually scale 2000 sq biplane designed Dave Boddington called Bi- Stormer monster Finished Silron butyrate dope weighed 10 lbs powered Profi 76 truly great engine 11000 rpm 14-6 no-nitro fuel lovely throttle plane used fiberglass arrow shafts empennage supported loose fitting hole light plywood former about half way back minimize lateral vibrations Regular Klett hinges Fully aerobatic never stripped gear problem Ailerons linked through bellcranks 1/16 wire running through very short lengths nylon tubing about 8 apart wing ribs center section short length wire soldered main link carried clevis servo Using connected ailerons automatically provides static balance aileron mass servo works against airstream Second plane Nosen Aeronca also using KPS-1411 servos linkages very much above Third Nosen Citabria differed tail surfaces aerodynam ically balanced plane now four years old still going strong though now using British Sky-Leader servos also standard torques aileron linkage still uses servo center section linkage aileron independent hooking together servo out put wheeL Ailerons use Graupner offset hinges tail surfaces also Graupner Fourth Nosen less mostly less Piper J-3 weighing 12Y4 lbs another Profi 76 butyrate over Silron Tail surface hinges Enterprise molded glass alittlebitofa pain install very strong Pushrods tail 3/16 dowel wire ends attached per old fashioned thread Duco rubbed run through two supports made ions Gold-n-rod outerblue tube Again simply avoid unwanted lateral move ments rods slide very freely must line up rod control arm servo attach point very carefully before cover ing airframe virtually no drag aileron has its own KPS-14 servo mounted right next center section rib no extension wiring other Y connection receiver aileron required hence no RE prob lems servo works through bellcrank connecting linkage comprises very short wire ends thread wrapped Ducoed l supported two intermediate places very short pieces nylon tubing No slop linkage virtually no weight added aileron itself debated about counterbalancing ailerons since worked independently weight servo gear rest have no indication about 40 flights really problem Unless has horribly nose-heavy beast intend flatten out monstrous terminal velocity dive some very serious Continued page 110 April 1980 29 Precision scale pIttire torn Lietericfl i-ranK vaflS span model weighs 9 lb. powered Merco 61 Finish Testors enamel final flat coat Hobbypoxy clear 1-lowara reiin mauc nis lop rimie r-Qu repiica 01 LIlal U Confederate Air Force Model weighs 10 lb finished acrylic over Coverite Dave Axford anchors Dave Henshaws Quadra-powered VanGrunsven RV 3 K-W Rally plane becoming favorite subject modeling since won efficiency award Larry Scott built Suevia- powered Great Lakes scratch Model fea tures on- board ignition fiberglass cowl Eighteen pound model needs 15 cu engine Finish lacquer primer acrylic enamel over basic Coverite produce questions answers would like hear comments Ill have next month Bob Beckman 8248 Holly Grove Ct Manassas VA 22110 RC Scale/Wischers Continued page 29 vibration problems cannot see -scale aircraft flown anything resembling scaletype flight comparative stresses cant controlled normal servos delivering some around 20 oz-in believe since l stiff wire much lighter RF associations can used quite successfully control pushrods provided supported 8 10 intervals carefully aligned nylon comparable slick guides prevent lateral movement type connec tion also minimizes weight respects tends dampen vibration better using heavier unsupported pushrod Bob Munns accomplishments frictionfree light-weight pushrods provide ideas will helpful sizes scale planes use standard servos planes up nine-foot span would indicate have power spare exception may servo driving large area flaps down 450 angle may require some extra energy particularly friction losses linkage Scale Details Inquiries regarding gathering information needed finish scale kit constantly reaching mailbox isnt easy inform someone should have started good scale drawing stack sharp photos before bought kit proper sequence Questions nature usually arise because kit buyer new scale has purchased kits past trainer-type models found kit box contain needed though some scale kits include three-view drawing additional information build model specific aircraft often required Kit infor mation may sufficient build model general outlines colors aircraft type builder dissatisfied ordinary perhaps because has seen well finished models photos comes awareness lacking information have asked list purchased scale goodies select parts can assembled kit making modeling assembly task rather building job Actually Sig Ace catalogs contain large portion available items market list sorts already exists regrettable builder wants top quality model specific airplane will find items useable original purchased condition Everything depends upon degree authen ticity desired Sport Scale modelers have definite advantage being willing accept ready-made parts necessarily perfect application Choosing model subject basis available data useable purchased parts would surest course action Preferred scale drawings should have sufficient detail remove doubts about such items control surface hinge point locations landing gear motion retract able Determine whether commercial retract mechanisms can employed Wheels swing through arc greater 900 may require machining parts beyond modelers capacity change design reduces scale accuracy decision must made whether loss accuracy acceptable may Sport Scale builders modeler searching ultimate detail will find quality suffers compro mises must made shape form structure accommodate use ready made parts Hinges example available profusion shapes sizes Possibly way can found use true scale hinging usually has pivot centers such position sacrifice scale appearance operation inevitable Wheels tires eyesore too otherwise excellent scale planes Too large too small wrong proportion hub tire size conspicuous error tread pattern also contributes lack authenticity Reliable scale data form drawings clear photos hand before starting construction will warn wheels can problem though have large number select have rejected some attractive prototypes because authentic wheels available exact diameter wheels cant found itis bestto err large side Research regarded boring ancillary art scale modeling Others dis like writing begging letters possible data sources Too us live relative isolation fellow modelers may come forth helpful information about choice subject Groups clubs specialize scale can assist another As research aid National Association Scale Modelers NASA has compiled Scale Date Source List its members list narrows down number places would need write specific information Some information can found columns such data becomes lost future reference unless reader clips item Mem bership dues NASA $500 annually Address inquiries Robert Underwood 4109 Concord Oaks Drive St Louis MO 63128 list contains government agencies com mercial sources drawings photographs some museum aircraft personal viewing study What may largest collection aircraft photo negatives possession Peter Bowers Peter has able answer inquiries because time required operate photo business prints several hundred thousand negatives can obtained through Castle Graphics PO Box D Green bank WA98253 Prices are$250 for8 x 10 $175 5 x 8 single weight glossy black white with$ 100 additional first class postage Like photo sources will necessary quite specific inquiring value photos should halftone magazine book types magnifying glass used 110 Model Aviation BLADES JET RANGER .. C0MMA~W HELl BOBCO parts fa ry CO~ ER 5 parts buta parts5REt51JTION1 rite for~ANSHRLJ 40 and$795 HavRICAN KAVAN Helicoptors parts DISCOUNT PRICES DEALER PRO5KMS ENCOURAGED10% Discount 5 Sets CA residents add 6% Sales tax173 Sunset Dr No2 add $150 postage & handlingDEJUCO check moncy order toVista CA 92083 Winning Ideas FOURMOST RETRACTABLE TOW HOOK RELEASE Price $675 Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight Y2 oz OTHER FOURMOST PRODUCTS 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE S250 IDEAL FOR QUICKY 500 PRICE S525Z2ZZ Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming FUR~ST Send SASE Complete Information 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 halftone photo merely enlarges dots really sharp photo can magnified read stenciled legends plane locate panel lines Best source photos modelers camera prototype can found Dedicated researchers travel great distances spend days photographing measuring plane Bob Dolly Wischer RL 1 S-221 Lapham Peak Roa4 Delafiel4 WI 53018 Tigercat/Norman Continued page 32 jig As indicated shape former F-i 2 vertical tail tapered thickness two hori zontal ribs fin cut scrap 1/20 1/16 sheet stock tapered width equal F-12 join down thickness fins leading edge Also contour upper fuselage immediately behind cockpit somewhat rounded sug gested area between formers F-S F-7 filled tapering pieces 1/16 sheet sanded rounded better approximate look full-size aircraft rudder move able part vertical tail built separately Nacelles Using same techniques described constructing fuselage nacelle formers longerons cut assembled masonite jig hold true being assem bled As nacelles mirror other will have flip formers shown plan make left nacelle Component AssembIy wing halves joined fuselage center such way leading edge half wing joined front former F-S main spars meet just behind former F-6 trailing edges join former F-8 will necessary deeply notch F-8 permit trailing edges pass through will also necessary remove portions fuselage stringers block passage main spar approximate dihedral angle has indicated formers F-5 F-6 will help aligning wing halves dihedral full-size aircraft substantial dihedral model approximately 1 rib Once wing halves positioned leading trailing edges main spar meet indicated two halves joined together epoxy Before wing joined fuselage check has approximately two degrees positive incidence use side longeron reference line wing joined per40 AIRFLO ENGINE MOUNT manently fuselage using epoxy scrap balsa fill gaps between wing nearby supporting fuselage formers area between root rib fuselage filled 1/3 2 sheet both strength base adhering tissue covering Similarly 1/32 X p pieces installed following shape airfoil portions fuselage adjacent wing root adds strength also provides suitable base tissue attachment nacelles joined wing position shown plan angled tops formers N-4 N-5 N-6 N-7 aligned underside wing trailing edge epoxied N-7 leading edge joined N-3 shown Once nacelle place fill area between nacelle underside wing rib nearest 1/32 sheet no need put 1/32 sheet fill top surfaces wing except portion tween N-3 turbulator spar Landing Geai- As indicated plan landing gear model optionat Flying Aces Rules permit subjects retractable gear flown wheels up thus eliminating considerable weight drag intend place model static dis play landing gear may desirable realistic base model decide build landing gear suggested make removable flying favorite technique use plug type small receptacles 1 / 16 aluminum tubing placed points main landing gear members meet fuselage nacelles landing gear components fashioned 1/32 wire pins slide aluminum tube receptacles intend use landing gear model suggested build appropriate recep tacles before proceeding covering Covering Coloring wing fuselage assembled using 1/32 sheet fill key points such wing roots etc have strengthened stress areas have provided anchor points tissue covering Almost Tigercats overall dark navy blue prototype color prototype original aircraft silver first F7 Fs tested Patuxent Maryland yellow July 1978 issue Air Classics magazine contains color photos civilian Tigercat silver red white black trim chose mark model green white bands sported Marine Corps F7 F El Toro Marine Base 1946 keeping general design philosophy suggested after shrinking tissue single coat dope applied As no rubber motor passing through fuselage have opportunity install completely detailed cockpit full pilot figure wish intention model pressures completing July 15 16 1978 Flying Aces National Meet dictated use conventional pilot bust carved styrofoam have unable find good detail F7 F cockpit interior fair amount information contained Model Airplane News book Best Nye VoL 3 Also excellent reference scale details may hadbypurchasingthe 1/72 Monogram plastic kit Propellers I used 8 Sterling plastic propellers cut 7 Static three-bladed propellers also made using 7 Sleek Streak props epoxied appropriate angles model will probably fly three-bladed props 112 Model Aviation 6 MODELS TO CHOOSE FROM OUR BEST SELLER THE CARDINAL SPORT - At Dealer snej snOlpststsa ,Sl55 O5uy atSbl5 50 bOlS5SbI It05 5 50 5P4i5Il ,j$OOa As, platis 5ttiSK5ith04df,,50Il0dOd FsOfl,SI O5OSt4 ato Intotti. Sirsto ad ta tfI 55 511dt5I COiai SOdy 51 YOSt 9t 555 COthI hO,. poshtOds t,oOlO 05 stnt sato ftt antOstrtWtO 4 tiittOtSSiflQ IttOtOt eOOtU5 on. 05 Sf545 0S50bI Ittlo 001 nO 554005 OdOSIttIs 50 i5t51155 0 5001055 000015 U. rail 5tSbilOO 00405 0050 s 51. ebsoted tea, Os a, OOse Md 5085044 50 OptS.flInadatiolAol 5 OsoljS5 4-Channel 25-40 Size 83 Wingspan 20-22 Os Loading Vey Aerobadic
Edition: Model Aviation - 1980/04
Page Numbers: 29, 110, 112
SCALE Bob & Dolly Wischer SERVO Sizes present trend toward larger scale models necessarily -scale always question skeptical builders minds need heavy-duty servos Except recent plane deHavilland 71 racer have using standard 29 oz-in servos deH uses Ace Bantam Midgets built kits have output 17 oz- flies very high speed far too fast scale realism has large control surfaces Its flight suffers no ill effects use small servos Jan 80 column asked reader comments use small servos large planes Bob Munn answered follows question about using regular servos -scale aircraft hit tender place happen believe big does neces sarily mean heavy turn means horsepower turn requires heavier build ing etc until end have 22-lb Piper Cub J-3 Quadra flies like Uglier Stik have built four -scale aircraft have used standard Kraft KPS-14 servos according Kraft literature deliver modest 17 oz-in torque No problems what soever long linkages clean free enough surface will drop its own weight linkage disconnected servo end have found some interesting things course making different installations some may help interest first large plane actually scale 2000 sq biplane designed Dave Boddington called Bi- Stormer monster Finished Silron butyrate dope weighed 10 lbs powered Profi 76 truly great engine 11000 rpm 14-6 no-nitro fuel lovely throttle plane used fiberglass arrow shafts empennage supported loose fitting hole light plywood former about half way back minimize lateral vibrations Regular Klett hinges Fully aerobatic never stripped gear problem Ailerons linked through bellcranks 1/16 wire running through very short lengths nylon tubing about 8 apart wing ribs center section short length wire soldered main link carried clevis servo Using connected ailerons automatically provides static balance aileron mass servo works against airstream Second plane Nosen Aeronca also using KPS-1411 servos linkages very much above Third Nosen Citabria differed tail surfaces aerodynam ically balanced plane now four years old still going strong though now using British Sky-Leader servos also standard torques aileron linkage still uses servo center section linkage aileron independent hooking together servo out put wheeL Ailerons use Graupner offset hinges tail surfaces also Graupner Fourth Nosen less mostly less Piper J-3 weighing 12Y4 lbs another Profi 76 butyrate over Silron Tail surface hinges Enterprise molded glass alittlebitofa pain install very strong Pushrods tail 3/16 dowel wire ends attached per old fashioned thread Duco rubbed run through two supports made ions Gold-n-rod outerblue tube Again simply avoid unwanted lateral move ments rods slide very freely must line up rod control arm servo attach point very carefully before cover ing airframe virtually no drag aileron has its own KPS-14 servo mounted right next center section rib no extension wiring other Y connection receiver aileron required hence no RE prob lems servo works through bellcrank connecting linkage comprises very short wire ends thread wrapped Ducoed l supported two intermediate places very short pieces nylon tubing No slop linkage virtually no weight added aileron itself debated about counterbalancing ailerons since worked independently weight servo gear rest have no indication about 40 flights really problem Unless has horribly nose-heavy beast intend flatten out monstrous terminal velocity dive some very serious Continued page 110 April 1980 29 Precision scale pIttire torn Lietericfl i-ranK vaflS span model weighs 9 lb. powered Merco 61 Finish Testors enamel final flat coat Hobbypoxy clear 1-lowara reiin mauc nis lop rimie r-Qu repiica 01 LIlal U Confederate Air Force Model weighs 10 lb finished acrylic over Coverite Dave Axford anchors Dave Henshaws Quadra-powered VanGrunsven RV 3 K-W Rally plane becoming favorite subject modeling since won efficiency award Larry Scott built Suevia- powered Great Lakes scratch Model fea tures on- board ignition fiberglass cowl Eighteen pound model needs 15 cu engine Finish lacquer primer acrylic enamel over basic Coverite produce questions answers would like hear comments Ill have next month Bob Beckman 8248 Holly Grove Ct Manassas VA 22110 RC Scale/Wischers Continued page 29 vibration problems cannot see -scale aircraft flown anything resembling scaletype flight comparative stresses cant controlled normal servos delivering some around 20 oz-in believe since l stiff wire much lighter RF associations can used quite successfully control pushrods provided supported 8 10 intervals carefully aligned nylon comparable slick guides prevent lateral movement type connec tion also minimizes weight respects tends dampen vibration better using heavier unsupported pushrod Bob Munns accomplishments frictionfree light-weight pushrods provide ideas will helpful sizes scale planes use standard servos planes up nine-foot span would indicate have power spare exception may servo driving large area flaps down 450 angle may require some extra energy particularly friction losses linkage Scale Details Inquiries regarding gathering information needed finish scale kit constantly reaching mailbox isnt easy inform someone should have started good scale drawing stack sharp photos before bought kit proper sequence Questions nature usually arise because kit buyer new scale has purchased kits past trainer-type models found kit box contain needed though some scale kits include three-view drawing additional information build model specific aircraft often required Kit infor mation may sufficient build model general outlines colors aircraft type builder dissatisfied ordinary perhaps because has seen well finished models photos comes awareness lacking information have asked list purchased scale goodies select parts can assembled kit making modeling assembly task rather building job Actually Sig Ace catalogs contain large portion available items market list sorts already exists regrettable builder wants top quality model specific airplane will find items useable original purchased condition Everything depends upon degree authen ticity desired Sport Scale modelers have definite advantage being willing accept ready-made parts necessarily perfect application Choosing model subject basis available data useable purchased parts would surest course action Preferred scale drawings should have sufficient detail remove doubts about such items control surface hinge point locations landing gear motion retract able Determine whether commercial retract mechanisms can employed Wheels swing through arc greater 900 may require machining parts beyond modelers capacity change design reduces scale accuracy decision must made whether loss accuracy acceptable may Sport Scale builders modeler searching ultimate detail will find quality suffers compro mises must made shape form structure accommodate use ready made parts Hinges example available profusion shapes sizes Possibly way can found use true scale hinging usually has pivot centers such position sacrifice scale appearance operation inevitable Wheels tires eyesore too otherwise excellent scale planes Too large too small wrong proportion hub tire size conspicuous error tread pattern also contributes lack authenticity Reliable scale data form drawings clear photos hand before starting construction will warn wheels can problem though have large number select have rejected some attractive prototypes because authentic wheels available exact diameter wheels cant found itis bestto err large side Research regarded boring ancillary art scale modeling Others dis like writing begging letters possible data sources Too us live relative isolation fellow modelers may come forth helpful information about choice subject Groups clubs specialize scale can assist another As research aid National Association Scale Modelers NASA has compiled Scale Date Source List its members list narrows down number places would need write specific information Some information can found columns such data becomes lost future reference unless reader clips item Mem bership dues NASA $500 annually Address inquiries Robert Underwood 4109 Concord Oaks Drive St Louis MO 63128 list contains government agencies com mercial sources drawings photographs some museum aircraft personal viewing study What may largest collection aircraft photo negatives possession Peter Bowers Peter has able answer inquiries because time required operate photo business prints several hundred thousand negatives can obtained through Castle Graphics PO Box D Green bank WA98253 Prices are$250 for8 x 10 $175 5 x 8 single weight glossy black white with$ 100 additional first class postage Like photo sources will necessary quite specific inquiring value photos should halftone magazine book types magnifying glass used 110 Model Aviation BLADES JET RANGER .. C0MMA~W HELl BOBCO parts fa ry CO~ ER 5 parts buta parts5REt51JTION1 rite for~ANSHRLJ 40 and$795 HavRICAN KAVAN Helicoptors parts DISCOUNT PRICES DEALER PRO5KMS ENCOURAGED10% Discount 5 Sets CA residents add 6% Sales tax173 Sunset Dr No2 add $150 postage & handlingDEJUCO check moncy order toVista CA 92083 Winning Ideas FOURMOST RETRACTABLE TOW HOOK RELEASE Price $675 Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight Y2 oz OTHER FOURMOST PRODUCTS 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG VIBRATION FREE PRICE S250 IDEAL FOR QUICKY 500 PRICE S525Z2ZZ Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming FUR~ST Send SASE Complete Information 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 halftone photo merely enlarges dots really sharp photo can magnified read stenciled legends plane locate panel lines Best source photos modelers camera prototype can found Dedicated researchers travel great distances spend days photographing measuring plane Bob Dolly Wischer RL 1 S-221 Lapham Peak Roa4 Delafiel4 WI 53018 Tigercat/Norman Continued page 32 jig As indicated shape former F-i 2 vertical tail tapered thickness two hori zontal ribs fin cut scrap 1/20 1/16 sheet stock tapered width equal F-12 join down thickness fins leading edge Also contour upper fuselage immediately behind cockpit somewhat rounded sug gested area between formers F-S F-7 filled tapering pieces 1/16 sheet sanded rounded better approximate look full-size aircraft rudder move able part vertical tail built separately Nacelles Using same techniques described constructing fuselage nacelle formers longerons cut assembled masonite jig hold true being assem bled As nacelles mirror other will have flip formers shown plan make left nacelle Component AssembIy wing halves joined fuselage center such way leading edge half wing joined front former F-S main spars meet just behind former F-6 trailing edges join former F-8 will necessary deeply notch F-8 permit trailing edges pass through will also necessary remove portions fuselage stringers block passage main spar approximate dihedral angle has indicated formers F-5 F-6 will help aligning wing halves dihedral full-size aircraft substantial dihedral model approximately 1 rib Once wing halves positioned leading trailing edges main spar meet indicated two halves joined together epoxy Before wing joined fuselage check has approximately two degrees positive incidence use side longeron reference line wing joined per40 AIRFLO ENGINE MOUNT manently fuselage using epoxy scrap balsa fill gaps between wing nearby supporting fuselage formers area between root rib fuselage filled 1/3 2 sheet both strength base adhering tissue covering Similarly 1/32 X p pieces installed following shape airfoil portions fuselage adjacent wing root adds strength also provides suitable base tissue attachment nacelles joined wing position shown plan angled tops formers N-4 N-5 N-6 N-7 aligned underside wing trailing edge epoxied N-7 leading edge joined N-3 shown Once nacelle place fill area between nacelle underside wing rib nearest 1/32 sheet no need put 1/32 sheet fill top surfaces wing except portion tween N-3 turbulator spar Landing Geai- As indicated plan landing gear model optionat Flying Aces Rules permit subjects retractable gear flown wheels up thus eliminating considerable weight drag intend place model static dis play landing gear may desirable realistic base model decide build landing gear suggested make removable flying favorite technique use plug type small receptacles 1 / 16 aluminum tubing placed points main landing gear members meet fuselage nacelles landing gear components fashioned 1/32 wire pins slide aluminum tube receptacles intend use landing gear model suggested build appropriate recep tacles before proceeding covering Covering Coloring wing fuselage assembled using 1/32 sheet fill key points such wing roots etc have strengthened stress areas have provided anchor points tissue covering Almost Tigercats overall dark navy blue prototype color prototype original aircraft silver first F7 Fs tested Patuxent Maryland yellow July 1978 issue Air Classics magazine contains color photos civilian Tigercat silver red white black trim chose mark model green white bands sported Marine Corps F7 F El Toro Marine Base 1946 keeping general design philosophy suggested after shrinking tissue single coat dope applied As no rubber motor passing through fuselage have opportunity install completely detailed cockpit full pilot figure wish intention model pressures completing July 15 16 1978 Flying Aces National Meet dictated use conventional pilot bust carved styrofoam have unable find good detail F7 F cockpit interior fair amount information contained Model Airplane News book Best Nye VoL 3 Also excellent reference scale details may hadbypurchasingthe 1/72 Monogram plastic kit Propellers I used 8 Sterling plastic propellers cut 7 Static three-bladed propellers also made using 7 Sleek Streak props epoxied appropriate angles model will probably fly three-bladed props 112 Model Aviation 6 MODELS TO CHOOSE FROM OUR BEST SELLER THE CARDINAL SPORT - At Dealer snej snOlpststsa ,Sl55 O5uy atSbl5 50 bOlS5SbI It05 5 50 5P4i5Il ,j$OOa As, platis 5ttiSK5ith04df,,50Il0dOd FsOfl,SI O5OSt4 ato Intotti. 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