This 42-oz 37in-wingspan replica last Curtiss Seahawks adapts Navy Carrier Profile Scale events U Bill Darkow John Hall SOUNDS nostalgia highpitched whine inertia starter sliding down scale pilot kicks big radial engine coughs barks settles ragged rumblesounds beloved true biplane fans real airplanes have two wings round engines apart special breed enthusiast people air shows today show interest early biplanes todays sophisticated high-tech streamliners Its special character colorful personalities two-wingers both ground air really grab attention youd like build fly attractive multipurpose model captures nostalgic spirit adventure romance associated biplanes consider control line version Curtiss XF7C-3 Seahawk few modifica tions design can compete either Profile Scale Navy Carrier eventsand its just plain fun fly Besides carrying name famous Seattle football team Seahawk has much recommend iteven touch mystery first Curtiss Seahawk F7C- 1 designed Charles Hathom Native American 1926-27 Navy however Left Versatile model uses OS Max 40 engine Navy Carrier 35-size engine Profile Carrier rejected airplane sea dutyprobably because slower Boeing F2B assigned entire production run 18 planes marines shore-based land planes Since F7C- 1 eligible scale bonus points under AMA Navy Carrier rules story might have ended discovered XF7C-3 November 1935 Model Airplane News three-view Wylam showed airplane arresting hook carried notation made curious Plans photographs information model unobtainable Returning original source Pete Bowerss Curtiss Aircraft 1917-1 947 found no mention XF7C-3 Could have Stealth fighter its day no official existence notation Wylam drawing F7C-1 December 1963 MAN supplied answer Models XF7C-2 XF7C-3 Curtiss projects US Navy export markets XF7C-3 built under wraps China demonstration Frank Hawks its maiden flight caught fire destroyed landing killing Lawrence McLelland famous model builder 1925-1930 era fatal crash total loss XF7C-3 ended further development Continued page 95 92 Model Aviation e Seahawk XF7C-3 ready action Authors friend John Hall installed hook release mechanism opposite side variant Curtiss SeahawklDarkow Continued page 92 Seahawk series design features reappeared F8C-4 XFlOC-l Fl ic-i Heildiver Goshawk Apparently XF7C-3 secret no official company records available Pete Bowers reference compiling book Furthermore airplane equipped carrier operation though China no carriers Makes wonder what going youd like copy three-view November 1935 Model Airplane News December 1963 MAN SASE address end article will get Construction Two XF7C-3 prototype models have thoroughly tested flown John Hall fellow Seattle Skyraider finished time compete Pacific Northwest Regional Control Line Championships Eugene Oregon Johns Seahawk didnt win its unique design attracted lot attention Further refinement should make model contender As might expect John differences opinion about some featureschiefly landing gear wing strut design landing gear truer scale Johns simpler center strut attachment Johns model truer scale simpler still arguing over outboard strut design easier build truer scale control line model Profile Scale biplane Navy Carrier presented some unique challenges Generally favored simplicity construction over fidelity scale also took care compromise scale accuracy little possible Fuselage fuselage can made single piece x 36-in mediumweight balsa trick lay out fuselage halves top bottom positioning outlines two parts tailto-tail configuration outlines overlapping Its less expensive using two sheets Use outside edges sheet joint between halves Cut openings hellcrank engine landing gear center strut mounts using 3/g x -in engine mount stock well lower wing Cutting out bellcrank engine mount openings produces loose piece between bellcrank engine will have glued assemble fuselage halves Note lower wing has 2 positive incidence Glue wing center strut mounting blocks together Drill tap blocks Continued page 166 Wing strut detail Strut right has tubes wires installed 12 ply strips cut facings placed nearby Assembly left has trimmed 12 facings installed diagonal strut show overlap reinforce joint between struts core pieces Note imbedded tubes wires mber 1992 95 Left top bottom fuselage halves have joined opening bellcrank cut out engine mount landing gear mount wing mount installed upper wing top actually four inches longer lower wing Note missing gussets lower wing Right basic assemblies ready installation wing struts model shown upside down cardboard templates fitted between wings hold exactly parallel N-struts being installed Rubberbands looped over wings struts maintain slight tension prevent shifting Note photo right steamlined aluminum-tube center struts have installed -20 nylon bolts glue fuselage halves along engine landing gear mounts see plan lower landing gear mount should shaped before gluing Glue fuselage halves together along centerline Cut slot horizontal stabilizer Cut opening install tailwheel mounting block wire Above Wheel fairing detail -in ply inset shown left cutout backside fairing gear leg 1/16 ply insert right Cut /16 ply nose doublers shape openings engine belicrank lower wing Note additional /16 ply cowl cheek glued over engine cutout left side model may instead use either 3A2 /8-in ply doublers have found however large forward area provides plenty strength A6 ply saves weight Wings Make wing rib patterns metal plywood Cut ribs except center rib upper wing two sheets /s x 3 x 36-in balsa Use /8-in ply center rib Note three center section ribs wing modified /16 planking -in-sq stub spar /s-in ply brace spruce wing mounting blocks Stack upper lower wing ribs separate pieces -in-sq spruce spar material Pin ribs together sand uniform correct shape Build leading trailing edges upper wing three pieces cutting horizontal notches match four A-in ply gussets gluing gussets make sure leading trailing edges flat no dihedral have built identical sweepback Use scrap balsa prop up leading trailing edges building center section upper wing Slide ribs onto stub spar space correctly Check alignment glue ribs between leading trailing edges Shape spruce blocks fit top center section ribs Glue blocks place glue has set turu assembly over recheck alignment glue shaped spruce blocks center section planking bottom upper wing completes upper wing center section Pin assembly back down building board prop up again recheck alignment Cut correct angles /4-in-sq left right spruce spars Note wing stub spar 166 Model Aviation Landing gear installation 1/16 ply insert has flushmounted epoxied place outboard wheel Note -in Lite Ply filler between wire gear legs SeahawklDarkow Continued page 95 John Hall holds own authors Seahawks Darkows left Both versions have tested flown Now its Darkows turn time Close-up tail hook release mechanism John Halls model dont need Halls model left Hall entered sport flying Profile Scale Hall also modified parts shown landing gear Pacific NW Regional CL Champs center strut attachment outboard wing N-strut design Full-Size Plans Available Page 178 Ce sa URSTACEV I/ODDUTEPLY SESUAP SPARACER ADA SCRRICSPLICE IROTTON UBBD ZIRRIOENiiiANDPATIABACI DEANE NICUNTSAlI N DCTAB PA N SU NE U NANAN D D A CU PAREDCNRRNENENN PA/NTTDN PA PA N NBRER ENS GSPAN APP3CTR~D LOWER-53 j AREA-370 Si 42 OB CISC NDTAR TERUTTUNCOLORS AlERT ERPRyI IPSigRiB & TEP El UPPET WiSg -CIWERN YBIIEBD DNBiqRB4 Bout B FISSEn Bill DEkESN B John HEll 1991 PIOSB DrOWn Bill DarkDDw7/91 joint detail pieces carbon fiber should work well Slide ribs onto spars Note first rib requires additional cutout receive stub spar Also note joined leading trailing edges efficiently possible ribs will require slight chamfer Space ribs correctly check wing alignment glue ribs between leading trailing edges glue has set remove upper wing assembly board add shape wing tips Note tips notched receive spar Cut four 3/ x 1/2-in spruce N-strut mounting blocks shape Drill center block 1/s-in-OD 3/s-in-long brass tubes Mount tubes Carefully position blocks between ribs flush bottom wing making sure holes aligned 3-in centers Glue blocks place Carefully mark locations vertical holes upper wing center section mounting blocks holes accept x 20 x 2/2-in nylon mounting bolts Drill holes aligning 3-in centers match mounting blocks fuselage used -in spade bit slightly relieve tops holes heads mounting bolts would seated flush top wing completes upper wing structure Since lower wing has no sweepback outer panels built piece Glue 1/s-in ply brace center leading edge glue -in-sq spruce stub spar trailing edge shown plan Prop pin leading trailing edges place Slide ribs main spar spacing correctly Check wing alignment glue ribs between leading trailing edges glue has set remove lower wing assembly board Plank center section top bottom Add gussets wing tips Shape wing tips countersink ounce lead outboard tip Cut spruce N-strut mounting blocks shape Drill block 3/i-in-long 1/s-in-OD brass tubes Install tubes glue blocks between ribs flush top wing Note rear block oles aligned 27/s-in centers lower wing now structurally complete Drill mounting holes bellcrank Glue lower wing place making sure its right angles fuselage sighting top front Check correct positive incidence Temporarily install upper wing using nylon bolts center section struts make sure lower wing aligned upper viewed above Type Golden Age design adaptable both Navy Carrier Profile Scale events Wingspan 37 inches Recommended engine size type OS Max 40 Class Navy Carrier 36-size engine Profile Carrier 29- 45-size sport flying Expected flying weight 42 ounces Type construction Built-up wing sheet balsa fuselage tail surfaces Type covering/finish recommended Paint Covering choice silkspan silk nylon ironon film fabric December 1992 167 V /C 55 SEBEDE STUD SPED- IAILDEO~ToTLISE wing tips templates needed keep wings exactly parallel fit N-struts Loop rubberbands over wings templates maintain slight tension prevent shifting struts being fitted Cut four 3/s-in-wide upright struts /s-in Lite Ply trimming fit between strut mounting holes shown plan Cut /s-in-wide -in-deep slots ends strut glue piece 1/2-inlong /8-in-OD brass tubing slot Cut eight l-in-Iong pieces music wire make slip fit inside tubes Bend piece wire slightly middle holding strut place fit wire end struts proper mounting Wing struts center section struts simply two short pieces standard 5/8-in streamlined aluminum strut tubing readily available well-stocked hobby shop Cut struts length shown shape fit wing camber glued A2 ply pads bottom upper wing additional bearing struts upper wing should 00 incidence installed nylon bolts tightened incidence can adjusted either inserting shims slightly changing length struts N-struts easier build describe both wings installed cut pair matching cardboard templates fit between wings slide over Static Display Models FREE Model Airplane Building Lessons RADIO CONTROLLED CARS S PLANES COPTERS NS FOR SHOW INFORMATION PHONE 714723-6057 Fax 7147230913 SWAP SHOP call Red 209-931-0214 GIANT RAFFLE Advance Admission Tickets Available International Modeler Shows Inc Dept E 10127 Costa Mesa CA 92627 holes wings wings should flex enough permit operation wires floating freely tubes mounted struts wings will self-align have finished fitting four upright struts little patience care called recheck wing alignment cut fit 1/s-in Lite Ply diagonal struts glue place N-struts should fit perfectly Run thin variety Hot Stuff wire/tube joints strut secure wires Remove N-struts glue 1/32 ply facings side Overlap upright/ diagonal joint strength An alteruative method securing N-struts drill across end upright struts bolt screw eyes eye bolts mounting blocks method permits adjust incidence unless bent metal fitting added ends N-struts allow mounting scaleangledway its still easier install vertically upper wing N-strut mounting blocks would have moved rib section inboard vertical installation Landing gear Drill two 5A2 holes landing gear mount shown plan Install -in lengths 5h2-OD brass tubing holes Bend four pieces /32 music wire shape shown used K&S Engineering Mini Wire Bender Fit landing gear wires tubes mount nylon clamps wrap solder shown Install 1R-in Lite Ply filler wheel fairings open-faced Make -in -in balsa glued together /s-in ply insert trimmed shape Notch insides receive landing gear legs shown plan Epoxy fairings place cover notch made landing gear wires piece /16 ply cover should flush fit An alteruative shaped aluminum landing gear available $10 Tom Dixon PO Box 671166 Marietta GA 30066 order line 404 973-0004 sure order small profile gear shaped aluminum gear much simpler mount fuselage adding wheel fairings becomes complicated Bellcrank/book release Cut bend bellcrank mounts shape Drill mounts bellcrank fit bellcrank place Assemble bellcrank mount model check free operation Throttle bellcranks available LR Products Ltd 7787 Archdale Ave Detroit MI 48228 Order upright short-span type Notch fuselage hardwood block carries /s-in hook release pin Glue 1As ply plates fuselage drill hook bearing stop stop should limit hook 450 angle hook released Install bellcrank pushrod hook release mechanism after finishing model 168 Model Aviation us Pasadena mm ItsaS Admission $600 dren under 6 FREE adult Win RIC System 1st Trophies 2nd & 3rd Covering finishing Except chrome yellow top surface upper wing entire model silver Since struts separate upper wing yellow accent easy apply wings can covered silkspan tissue silk nylon iron-on plastic fabric Subsequent finishing operations will depend material chosen wont go details Add details such windshield paint cockpit black guns gunsight radio mast aileron stripes decorations complete upper wing has mounted put Loctite thin Hot Stuff wire/tube joints help hold struts place Flying For test-flying balance model shown plan up 1/2 ifl further forward Mount engine far forward possible best balance maximum tank space can experiment wing incidence balance point settings optimal performance under certain conditions slightly thicker fully symmetrical airfoils both wings Seahawk may show some modest stunt performance sport flying use 55- 70-ft control lines See ALMA Competition Regulations handbook recommendations control line wire diameters pull-testing etc Happy flying Address correspondence 1237 5 Grant St Tacoma WA 98405 ED GOOD AIRMEN Ltgflter PtbAn Baud da Bust Pilot KitMade USA #1081/8 scaIe.$695 #1061/6 scale #105-1/5 scale #1041/4 scale #103-1/3 scale.1595 #3081/8 jet695 #307 1/7 jet795 L V Lie tm FAX 315 5484099 Full Body Pilot Kit #206-1/6 scaIe.$ 995 #205-1/5 scale.1095 #204114 scale.1195 #203-1/3 scale.1795 Cotarns Pilot head hads Pools helmet cap goggles full templates altO easy Soo sImple ssmg teqoltee ORDERING INSTRIJOTIONS see year dealer first Ot oeder direct Add 5100 shipping RIPS Residents edd 7% lao Cheph 0 Mosey Orde THE AIRPLANE FACTORY INC 1880 PINE VIEW MANDEVILLE LA 70448 504-626-7840 FREE CATALOG R/C Combat Crash Resistant 48 wingspan 4A -5 lbs Aluminum lundiog Gene Video 4 P & H $295 LIST $8995 MC e COD 1 800 264 7840 Kombat 4Qtt member quick building exiremely durable Armadillo series Made aluminum polypropelyne no foam can assembled engine mounted radio installed hour Nothing extra buy provide 4 channel radio / 25-40 engine supply everything else great sports plane fully aerobatic bolt-on symmetrical wing pre-hinged pre-finished red biue orange yellow compared other aimost ready fly designs take 10-12 hours longer complete Kombat 40 true winner ORDER YOURS TODAVI Trainer Version available $7495 t Flying Flys hour SCRATCHBUILD 14 SCALE PLANS ae8u pilee CESSNA AG WAGON 1235 4 sssS34OO CESSNA U206TU206 lo75 5 osS87OC CESSNA 152 AEROBAT 99s 3 msS3SOO PIPER PAWNEEios 4 sanSS4OC TRANSA VIA AIRTRUK 1178 5 osS37OO EDO FLOATS[v32]Tsa 2 unSWSOC EDO AMPHIB FLOATS 61 3 sasSSSOC Add PSPsas$53-OO Snarfane ms856-OO Afransail FREE Degasmeastatjoas plasas Photographs available PHONE 032128192 VISA & MASTERCARD Welcome J SEND as3 go Eon COMPLETE LISPING uLL PLANS BOOKS eaaPeoDLCTs SEROICEs SENT FREE WIPe ALL ORDERS NEW ZEALAND AERO PRODUCTS 3d WAf U PABADE SPIRLINS POINT ELUPE NOW ZEALAND Conlrol Line Version Also Available Gail Today Dealer Inquiries Welcome
Edition: Model Aviation - 1992/12
Page Numbers: 92, 95, 166, 167, 168, 169
This 42-oz 37in-wingspan replica last Curtiss Seahawks adapts Navy Carrier Profile Scale events U Bill Darkow John Hall SOUNDS nostalgia highpitched whine inertia starter sliding down scale pilot kicks big radial engine coughs barks settles ragged rumblesounds beloved true biplane fans real airplanes have two wings round engines apart special breed enthusiast people air shows today show interest early biplanes todays sophisticated high-tech streamliners Its special character colorful personalities two-wingers both ground air really grab attention youd like build fly attractive multipurpose model captures nostalgic spirit adventure romance associated biplanes consider control line version Curtiss XF7C-3 Seahawk few modifica tions design can compete either Profile Scale Navy Carrier eventsand its just plain fun fly Besides carrying name famous Seattle football team Seahawk has much recommend iteven touch mystery first Curtiss Seahawk F7C- 1 designed Charles Hathom Native American 1926-27 Navy however Left Versatile model uses OS Max 40 engine Navy Carrier 35-size engine Profile Carrier rejected airplane sea dutyprobably because slower Boeing F2B assigned entire production run 18 planes marines shore-based land planes Since F7C- 1 eligible scale bonus points under AMA Navy Carrier rules story might have ended discovered XF7C-3 November 1935 Model Airplane News three-view Wylam showed airplane arresting hook carried notation made curious Plans photographs information model unobtainable Returning original source Pete Bowerss Curtiss Aircraft 1917-1 947 found no mention XF7C-3 Could have Stealth fighter its day no official existence notation Wylam drawing F7C-1 December 1963 MAN supplied answer Models XF7C-2 XF7C-3 Curtiss projects US Navy export markets XF7C-3 built under wraps China demonstration Frank Hawks its maiden flight caught fire destroyed landing killing Lawrence McLelland famous model builder 1925-1930 era fatal crash total loss XF7C-3 ended further development Continued page 95 92 Model Aviation e Seahawk XF7C-3 ready action Authors friend John Hall installed hook release mechanism opposite side variant Curtiss SeahawklDarkow Continued page 92 Seahawk series design features reappeared F8C-4 XFlOC-l Fl ic-i Heildiver Goshawk Apparently XF7C-3 secret no official company records available Pete Bowers reference compiling book Furthermore airplane equipped carrier operation though China no carriers Makes wonder what going youd like copy three-view November 1935 Model Airplane News December 1963 MAN SASE address end article will get Construction Two XF7C-3 prototype models have thoroughly tested flown John Hall fellow Seattle Skyraider finished time compete Pacific Northwest Regional Control Line Championships Eugene Oregon Johns Seahawk didnt win its unique design attracted lot attention Further refinement should make model contender As might expect John differences opinion about some featureschiefly landing gear wing strut design landing gear truer scale Johns simpler center strut attachment Johns model truer scale simpler still arguing over outboard strut design easier build truer scale control line model Profile Scale biplane Navy Carrier presented some unique challenges Generally favored simplicity construction over fidelity scale also took care compromise scale accuracy little possible Fuselage fuselage can made single piece x 36-in mediumweight balsa trick lay out fuselage halves top bottom positioning outlines two parts tailto-tail configuration outlines overlapping Its less expensive using two sheets Use outside edges sheet joint between halves Cut openings hellcrank engine landing gear center strut mounts using 3/g x -in engine mount stock well lower wing Cutting out bellcrank engine mount openings produces loose piece between bellcrank engine will have glued assemble fuselage halves Note lower wing has 2 positive incidence Glue wing center strut mounting blocks together Drill tap blocks Continued page 166 Wing strut detail Strut right has tubes wires installed 12 ply strips cut facings placed nearby Assembly left has trimmed 12 facings installed diagonal strut show overlap reinforce joint between struts core pieces Note imbedded tubes wires mber 1992 95 Left top bottom fuselage halves have joined opening bellcrank cut out engine mount landing gear mount wing mount installed upper wing top actually four inches longer lower wing Note missing gussets lower wing Right basic assemblies ready installation wing struts model shown upside down cardboard templates fitted between wings hold exactly parallel N-struts being installed Rubberbands looped over wings struts maintain slight tension prevent shifting Note photo right steamlined aluminum-tube center struts have installed -20 nylon bolts glue fuselage halves along engine landing gear mounts see plan lower landing gear mount should shaped before gluing Glue fuselage halves together along centerline Cut slot horizontal stabilizer Cut opening install tailwheel mounting block wire Above Wheel fairing detail -in ply inset shown left cutout backside fairing gear leg 1/16 ply insert right Cut /16 ply nose doublers shape openings engine belicrank lower wing Note additional /16 ply cowl cheek glued over engine cutout left side model may instead use either 3A2 /8-in ply doublers have found however large forward area provides plenty strength A6 ply saves weight Wings Make wing rib patterns metal plywood Cut ribs except center rib upper wing two sheets /s x 3 x 36-in balsa Use /8-in ply center rib Note three center section ribs wing modified /16 planking -in-sq stub spar /s-in ply brace spruce wing mounting blocks Stack upper lower wing ribs separate pieces -in-sq spruce spar material Pin ribs together sand uniform correct shape Build leading trailing edges upper wing three pieces cutting horizontal notches match four A-in ply gussets gluing gussets make sure leading trailing edges flat no dihedral have built identical sweepback Use scrap balsa prop up leading trailing edges building center section upper wing Slide ribs onto stub spar space correctly Check alignment glue ribs between leading trailing edges Shape spruce blocks fit top center section ribs Glue blocks place glue has set turu assembly over recheck alignment glue shaped spruce blocks center section planking bottom upper wing completes upper wing center section Pin assembly back down building board prop up again recheck alignment Cut correct angles /4-in-sq left right spruce spars Note wing stub spar 166 Model Aviation Landing gear installation 1/16 ply insert has flushmounted epoxied place outboard wheel Note -in Lite Ply filler between wire gear legs SeahawklDarkow Continued page 95 John Hall holds own authors Seahawks Darkows left Both versions have tested flown Now its Darkows turn time Close-up tail hook release mechanism John Halls model dont need Halls model left Hall entered sport flying Profile Scale Hall also modified parts shown landing gear Pacific NW Regional CL Champs center strut attachment outboard wing N-strut design Full-Size Plans Available Page 178 Ce sa URSTACEV I/ODDUTEPLY SESUAP SPARACER ADA SCRRICSPLICE IROTTON UBBD ZIRRIOENiiiANDPATIABACI DEANE NICUNTSAlI N DCTAB PA N SU NE U NANAN D D A CU PAREDCNRRNENENN PA/NTTDN PA PA N NBRER ENS GSPAN APP3CTR~D LOWER-53 j AREA-370 Si 42 OB CISC NDTAR TERUTTUNCOLORS AlERT ERPRyI IPSigRiB & TEP El UPPET WiSg -CIWERN YBIIEBD DNBiqRB4 Bout B FISSEn Bill DEkESN B John HEll 1991 PIOSB DrOWn Bill DarkDDw7/91 joint detail pieces carbon fiber should work well Slide ribs onto spars Note first rib requires additional cutout receive stub spar Also note joined leading trailing edges efficiently possible ribs will require slight chamfer Space ribs correctly check wing alignment glue ribs between leading trailing edges glue has set remove upper wing assembly board add shape wing tips Note tips notched receive spar Cut four 3/ x 1/2-in spruce N-strut mounting blocks shape Drill center block 1/s-in-OD 3/s-in-long brass tubes Mount tubes Carefully position blocks between ribs flush bottom wing making sure holes aligned 3-in centers Glue blocks place Carefully mark locations vertical holes upper wing center section mounting blocks holes accept x 20 x 2/2-in nylon mounting bolts Drill holes aligning 3-in centers match mounting blocks fuselage used -in spade bit slightly relieve tops holes heads mounting bolts would seated flush top wing completes upper wing structure Since lower wing has no sweepback outer panels built piece Glue 1/s-in ply brace center leading edge glue -in-sq spruce stub spar trailing edge shown plan Prop pin leading trailing edges place Slide ribs main spar spacing correctly Check wing alignment glue ribs between leading trailing edges glue has set remove lower wing assembly board Plank center section top bottom Add gussets wing tips Shape wing tips countersink ounce lead outboard tip Cut spruce N-strut mounting blocks shape Drill block 3/i-in-long 1/s-in-OD brass tubes Install tubes glue blocks between ribs flush top wing Note rear block oles aligned 27/s-in centers lower wing now structurally complete Drill mounting holes bellcrank Glue lower wing place making sure its right angles fuselage sighting top front Check correct positive incidence Temporarily install upper wing using nylon bolts center section struts make sure lower wing aligned upper viewed above Type Golden Age design adaptable both Navy Carrier Profile Scale events Wingspan 37 inches Recommended engine size type OS Max 40 Class Navy Carrier 36-size engine Profile Carrier 29- 45-size sport flying Expected flying weight 42 ounces Type construction Built-up wing sheet balsa fuselage tail surfaces Type covering/finish recommended Paint Covering choice silkspan silk nylon ironon film fabric December 1992 167 V /C 55 SEBEDE STUD SPED- IAILDEO~ToTLISE wing tips templates needed keep wings exactly parallel fit N-struts Loop rubberbands over wings templates maintain slight tension prevent shifting struts being fitted Cut four 3/s-in-wide upright struts /s-in Lite Ply trimming fit between strut mounting holes shown plan Cut /s-in-wide -in-deep slots ends strut glue piece 1/2-inlong /8-in-OD brass tubing slot Cut eight l-in-Iong pieces music wire make slip fit inside tubes Bend piece wire slightly middle holding strut place fit wire end struts proper mounting Wing struts center section struts simply two short pieces standard 5/8-in streamlined aluminum strut tubing readily available well-stocked hobby shop Cut struts length shown shape fit wing camber glued A2 ply pads bottom upper wing additional bearing struts upper wing should 00 incidence installed nylon bolts tightened incidence can adjusted either inserting shims slightly changing length struts N-struts easier build describe both wings installed cut pair matching cardboard templates fit between wings slide over Static Display Models FREE Model Airplane Building Lessons RADIO CONTROLLED CARS S PLANES COPTERS NS FOR SHOW INFORMATION PHONE 714723-6057 Fax 7147230913 SWAP SHOP call Red 209-931-0214 GIANT RAFFLE Advance Admission Tickets Available International Modeler Shows Inc Dept E 10127 Costa Mesa CA 92627 holes wings wings should flex enough permit operation wires floating freely tubes mounted struts wings will self-align have finished fitting four upright struts little patience care called recheck wing alignment cut fit 1/s-in Lite Ply diagonal struts glue place N-struts should fit perfectly Run thin variety Hot Stuff wire/tube joints strut secure wires Remove N-struts glue 1/32 ply facings side Overlap upright/ diagonal joint strength An alteruative method securing N-struts drill across end upright struts bolt screw eyes eye bolts mounting blocks method permits adjust incidence unless bent metal fitting added ends N-struts allow mounting scaleangledway its still easier install vertically upper wing N-strut mounting blocks would have moved rib section inboard vertical installation Landing gear Drill two 5A2 holes landing gear mount shown plan Install -in lengths 5h2-OD brass tubing holes Bend four pieces /32 music wire shape shown used K&S Engineering Mini Wire Bender Fit landing gear wires tubes mount nylon clamps wrap solder shown Install 1R-in Lite Ply filler wheel fairings open-faced Make -in -in balsa glued together /s-in ply insert trimmed shape Notch insides receive landing gear legs shown plan Epoxy fairings place cover notch made landing gear wires piece /16 ply cover should flush fit An alteruative shaped aluminum landing gear available $10 Tom Dixon PO Box 671166 Marietta GA 30066 order line 404 973-0004 sure order small profile gear shaped aluminum gear much simpler mount fuselage adding wheel fairings becomes complicated Bellcrank/book release Cut bend bellcrank mounts shape Drill mounts bellcrank fit bellcrank place Assemble bellcrank mount model check free operation Throttle bellcranks available LR Products Ltd 7787 Archdale Ave Detroit MI 48228 Order upright short-span type Notch fuselage hardwood block carries /s-in hook release pin Glue 1As ply plates fuselage drill hook bearing stop stop should limit hook 450 angle hook released Install bellcrank pushrod hook release mechanism after finishing model 168 Model Aviation us Pasadena mm ItsaS Admission $600 dren under 6 FREE adult Win RIC System 1st Trophies 2nd & 3rd Covering finishing Except chrome yellow top surface upper wing entire model silver Since struts separate upper wing yellow accent easy apply wings can covered silkspan tissue silk nylon iron-on plastic fabric Subsequent finishing operations will depend material chosen wont go details Add details such windshield paint cockpit black guns gunsight radio mast aileron stripes decorations complete upper wing has mounted put Loctite thin Hot Stuff wire/tube joints help hold struts place Flying For test-flying balance model shown plan up 1/2 ifl further forward Mount engine far forward possible best balance maximum tank space can experiment wing incidence balance point settings optimal performance under certain conditions slightly thicker fully symmetrical airfoils both wings Seahawk may show some modest stunt performance sport flying use 55- 70-ft control lines See ALMA Competition Regulations handbook recommendations control line wire diameters pull-testing etc Happy flying Address correspondence 1237 5 Grant St Tacoma WA 98405 ED GOOD AIRMEN Ltgflter PtbAn Baud da Bust Pilot KitMade USA #1081/8 scaIe.$695 #1061/6 scale #105-1/5 scale #1041/4 scale #103-1/3 scale.1595 #3081/8 jet695 #307 1/7 jet795 L V Lie tm FAX 315 5484099 Full Body Pilot Kit #206-1/6 scaIe.$ 995 #205-1/5 scale.1095 #204114 scale.1195 #203-1/3 scale.1795 Cotarns Pilot head hads Pools helmet cap goggles full templates altO easy Soo sImple ssmg teqoltee ORDERING INSTRIJOTIONS see year dealer first Ot oeder direct Add 5100 shipping RIPS Residents edd 7% lao Cheph 0 Mosey Orde THE AIRPLANE FACTORY INC 1880 PINE VIEW MANDEVILLE LA 70448 504-626-7840 FREE CATALOG R/C Combat Crash Resistant 48 wingspan 4A -5 lbs Aluminum lundiog Gene Video 4 P & H $295 LIST $8995 MC e COD 1 800 264 7840 Kombat 4Qtt member quick building exiremely durable Armadillo series Made aluminum polypropelyne no foam can assembled engine mounted radio installed hour Nothing extra buy provide 4 channel radio / 25-40 engine supply everything else great sports plane fully aerobatic bolt-on symmetrical wing pre-hinged pre-finished red biue orange yellow compared other aimost ready fly designs take 10-12 hours longer complete Kombat 40 true winner ORDER YOURS TODAVI Trainer Version available $7495 t Flying Flys hour SCRATCHBUILD 14 SCALE PLANS ae8u pilee CESSNA AG WAGON 1235 4 sssS34OO CESSNA U206TU206 lo75 5 osS87OC CESSNA 152 AEROBAT 99s 3 msS3SOO PIPER PAWNEEios 4 sanSS4OC TRANSA VIA AIRTRUK 1178 5 osS37OO EDO FLOATS[v32]Tsa 2 unSWSOC EDO AMPHIB FLOATS 61 3 sasSSSOC Add PSPsas$53-OO Snarfane ms856-OO Afransail FREE Degasmeastatjoas plasas Photographs available PHONE 032128192 VISA & MASTERCARD Welcome J SEND as3 go Eon COMPLETE LISPING uLL PLANS BOOKS eaaPeoDLCTs SEROICEs SENT FREE WIPe ALL ORDERS NEW ZEALAND AERO PRODUCTS 3d WAf U PABADE SPIRLINS POINT ELUPE NOW ZEALAND Conlrol Line Version Also Available Gail Today Dealer Inquiries Welcome
Edition: Model Aviation - 1992/12
Page Numbers: 92, 95, 166, 167, 168, 169
This 42-oz 37in-wingspan replica last Curtiss Seahawks adapts Navy Carrier Profile Scale events U Bill Darkow John Hall SOUNDS nostalgia highpitched whine inertia starter sliding down scale pilot kicks big radial engine coughs barks settles ragged rumblesounds beloved true biplane fans real airplanes have two wings round engines apart special breed enthusiast people air shows today show interest early biplanes todays sophisticated high-tech streamliners Its special character colorful personalities two-wingers both ground air really grab attention youd like build fly attractive multipurpose model captures nostalgic spirit adventure romance associated biplanes consider control line version Curtiss XF7C-3 Seahawk few modifica tions design can compete either Profile Scale Navy Carrier eventsand its just plain fun fly Besides carrying name famous Seattle football team Seahawk has much recommend iteven touch mystery first Curtiss Seahawk F7C- 1 designed Charles Hathom Native American 1926-27 Navy however Left Versatile model uses OS Max 40 engine Navy Carrier 35-size engine Profile Carrier rejected airplane sea dutyprobably because slower Boeing F2B assigned entire production run 18 planes marines shore-based land planes Since F7C- 1 eligible scale bonus points under AMA Navy Carrier rules story might have ended discovered XF7C-3 November 1935 Model Airplane News three-view Wylam showed airplane arresting hook carried notation made curious Plans photographs information model unobtainable Returning original source Pete Bowerss Curtiss Aircraft 1917-1 947 found no mention XF7C-3 Could have Stealth fighter its day no official existence notation Wylam drawing F7C-1 December 1963 MAN supplied answer Models XF7C-2 XF7C-3 Curtiss projects US Navy export markets XF7C-3 built under wraps China demonstration Frank Hawks its maiden flight caught fire destroyed landing killing Lawrence McLelland famous model builder 1925-1930 era fatal crash total loss XF7C-3 ended further development Continued page 95 92 Model Aviation e Seahawk XF7C-3 ready action Authors friend John Hall installed hook release mechanism opposite side variant Curtiss SeahawklDarkow Continued page 92 Seahawk series design features reappeared F8C-4 XFlOC-l Fl ic-i Heildiver Goshawk Apparently XF7C-3 secret no official company records available Pete Bowers reference compiling book Furthermore airplane equipped carrier operation though China no carriers Makes wonder what going youd like copy three-view November 1935 Model Airplane News December 1963 MAN SASE address end article will get Construction Two XF7C-3 prototype models have thoroughly tested flown John Hall fellow Seattle Skyraider finished time compete Pacific Northwest Regional Control Line Championships Eugene Oregon Johns Seahawk didnt win its unique design attracted lot attention Further refinement should make model contender As might expect John differences opinion about some featureschiefly landing gear wing strut design landing gear truer scale Johns simpler center strut attachment Johns model truer scale simpler still arguing over outboard strut design easier build truer scale control line model Profile Scale biplane Navy Carrier presented some unique challenges Generally favored simplicity construction over fidelity scale also took care compromise scale accuracy little possible Fuselage fuselage can made single piece x 36-in mediumweight balsa trick lay out fuselage halves top bottom positioning outlines two parts tailto-tail configuration outlines overlapping Its less expensive using two sheets Use outside edges sheet joint between halves Cut openings hellcrank engine landing gear center strut mounts using 3/g x -in engine mount stock well lower wing Cutting out bellcrank engine mount openings produces loose piece between bellcrank engine will have glued assemble fuselage halves Note lower wing has 2 positive incidence Glue wing center strut mounting blocks together Drill tap blocks Continued page 166 Wing strut detail Strut right has tubes wires installed 12 ply strips cut facings placed nearby Assembly left has trimmed 12 facings installed diagonal strut show overlap reinforce joint between struts core pieces Note imbedded tubes wires mber 1992 95 Left top bottom fuselage halves have joined opening bellcrank cut out engine mount landing gear mount wing mount installed upper wing top actually four inches longer lower wing Note missing gussets lower wing Right basic assemblies ready installation wing struts model shown upside down cardboard templates fitted between wings hold exactly parallel N-struts being installed Rubberbands looped over wings struts maintain slight tension prevent shifting Note photo right steamlined aluminum-tube center struts have installed -20 nylon bolts glue fuselage halves along engine landing gear mounts see plan lower landing gear mount should shaped before gluing Glue fuselage halves together along centerline Cut slot horizontal stabilizer Cut opening install tailwheel mounting block wire Above Wheel fairing detail -in ply inset shown left cutout backside fairing gear leg 1/16 ply insert right Cut /16 ply nose doublers shape openings engine belicrank lower wing Note additional /16 ply cowl cheek glued over engine cutout left side model may instead use either 3A2 /8-in ply doublers have found however large forward area provides plenty strength A6 ply saves weight Wings Make wing rib patterns metal plywood Cut ribs except center rib upper wing two sheets /s x 3 x 36-in balsa Use /8-in ply center rib Note three center section ribs wing modified /16 planking -in-sq stub spar /s-in ply brace spruce wing mounting blocks Stack upper lower wing ribs separate pieces -in-sq spruce spar material Pin ribs together sand uniform correct shape Build leading trailing edges upper wing three pieces cutting horizontal notches match four A-in ply gussets gluing gussets make sure leading trailing edges flat no dihedral have built identical sweepback Use scrap balsa prop up leading trailing edges building center section upper wing Slide ribs onto stub spar space correctly Check alignment glue ribs between leading trailing edges Shape spruce blocks fit top center section ribs Glue blocks place glue has set turu assembly over recheck alignment glue shaped spruce blocks center section planking bottom upper wing completes upper wing center section Pin assembly back down building board prop up again recheck alignment Cut correct angles /4-in-sq left right spruce spars Note wing stub spar 166 Model Aviation Landing gear installation 1/16 ply insert has flushmounted epoxied place outboard wheel Note -in Lite Ply filler between wire gear legs SeahawklDarkow Continued page 95 John Hall holds own authors Seahawks Darkows left Both versions have tested flown Now its Darkows turn time Close-up tail hook release mechanism John Halls model dont need Halls model left Hall entered sport flying Profile Scale Hall also modified parts shown landing gear Pacific NW Regional CL Champs center strut attachment outboard wing N-strut design Full-Size Plans Available Page 178 Ce sa URSTACEV I/ODDUTEPLY SESUAP SPARACER ADA SCRRICSPLICE IROTTON UBBD ZIRRIOENiiiANDPATIABACI DEANE NICUNTSAlI N DCTAB PA N SU NE U NANAN D D A CU PAREDCNRRNENENN PA/NTTDN PA PA N NBRER ENS GSPAN APP3CTR~D LOWER-53 j AREA-370 Si 42 OB CISC NDTAR TERUTTUNCOLORS AlERT ERPRyI IPSigRiB & TEP El UPPET WiSg -CIWERN YBIIEBD DNBiqRB4 Bout B FISSEn Bill DEkESN B John HEll 1991 PIOSB DrOWn Bill DarkDDw7/91 joint detail pieces carbon fiber should work well Slide ribs onto spars Note first rib requires additional cutout receive stub spar Also note joined leading trailing edges efficiently possible ribs will require slight chamfer Space ribs correctly check wing alignment glue ribs between leading trailing edges glue has set remove upper wing assembly board add shape wing tips Note tips notched receive spar Cut four 3/ x 1/2-in spruce N-strut mounting blocks shape Drill center block 1/s-in-OD 3/s-in-long brass tubes Mount tubes Carefully position blocks between ribs flush bottom wing making sure holes aligned 3-in centers Glue blocks place Carefully mark locations vertical holes upper wing center section mounting blocks holes accept x 20 x 2/2-in nylon mounting bolts Drill holes aligning 3-in centers match mounting blocks fuselage used -in spade bit slightly relieve tops holes heads mounting bolts would seated flush top wing completes upper wing structure Since lower wing has no sweepback outer panels built piece Glue 1/s-in ply brace center leading edge glue -in-sq spruce stub spar trailing edge shown plan Prop pin leading trailing edges place Slide ribs main spar spacing correctly Check wing alignment glue ribs between leading trailing edges glue has set remove lower wing assembly board Plank center section top bottom Add gussets wing tips Shape wing tips countersink ounce lead outboard tip Cut spruce N-strut mounting blocks shape Drill block 3/i-in-long 1/s-in-OD brass tubes Install tubes glue blocks between ribs flush top wing Note rear block oles aligned 27/s-in centers lower wing now structurally complete Drill mounting holes bellcrank Glue lower wing place making sure its right angles fuselage sighting top front Check correct positive incidence Temporarily install upper wing using nylon bolts center section struts make sure lower wing aligned upper viewed above Type Golden Age design adaptable both Navy Carrier Profile Scale events Wingspan 37 inches Recommended engine size type OS Max 40 Class Navy Carrier 36-size engine Profile Carrier 29- 45-size sport flying Expected flying weight 42 ounces Type construction Built-up wing sheet balsa fuselage tail surfaces Type covering/finish recommended Paint Covering choice silkspan silk nylon ironon film fabric December 1992 167 V /C 55 SEBEDE STUD SPED- IAILDEO~ToTLISE wing tips templates needed keep wings exactly parallel fit N-struts Loop rubberbands over wings templates maintain slight tension prevent shifting struts being fitted Cut four 3/s-in-wide upright struts /s-in Lite Ply trimming fit between strut mounting holes shown plan Cut /s-in-wide -in-deep slots ends strut glue piece 1/2-inlong /8-in-OD brass tubing slot Cut eight l-in-Iong pieces music wire make slip fit inside tubes Bend piece wire slightly middle holding strut place fit wire end struts proper mounting Wing struts center section struts simply two short pieces standard 5/8-in streamlined aluminum strut tubing readily available well-stocked hobby shop Cut struts length shown shape fit wing camber glued A2 ply pads bottom upper wing additional bearing struts upper wing should 00 incidence installed nylon bolts tightened incidence can adjusted either inserting shims slightly changing length struts N-struts easier build describe both wings installed cut pair matching cardboard templates fit between wings slide over Static Display Models FREE Model Airplane Building Lessons RADIO CONTROLLED CARS S PLANES COPTERS NS FOR SHOW INFORMATION PHONE 714723-6057 Fax 7147230913 SWAP SHOP call Red 209-931-0214 GIANT RAFFLE Advance Admission Tickets Available International Modeler Shows Inc Dept E 10127 Costa Mesa CA 92627 holes wings wings should flex enough permit operation wires floating freely tubes mounted struts wings will self-align have finished fitting four upright struts little patience care called recheck wing alignment cut fit 1/s-in Lite Ply diagonal struts glue place N-struts should fit perfectly Run thin variety Hot Stuff wire/tube joints strut secure wires Remove N-struts glue 1/32 ply facings side Overlap upright/ diagonal joint strength An alteruative method securing N-struts drill across end upright struts bolt screw eyes eye bolts mounting blocks method permits adjust incidence unless bent metal fitting added ends N-struts allow mounting scaleangledway its still easier install vertically upper wing N-strut mounting blocks would have moved rib section inboard vertical installation Landing gear Drill two 5A2 holes landing gear mount shown plan Install -in lengths 5h2-OD brass tubing holes Bend four pieces /32 music wire shape shown used K&S Engineering Mini Wire Bender Fit landing gear wires tubes mount nylon clamps wrap solder shown Install 1R-in Lite Ply filler wheel fairings open-faced Make -in -in balsa glued together /s-in ply insert trimmed shape Notch insides receive landing gear legs shown plan Epoxy fairings place cover notch made landing gear wires piece /16 ply cover should flush fit An alteruative shaped aluminum landing gear available $10 Tom Dixon PO Box 671166 Marietta GA 30066 order line 404 973-0004 sure order small profile gear shaped aluminum gear much simpler mount fuselage adding wheel fairings becomes complicated Bellcrank/book release Cut bend bellcrank mounts shape Drill mounts bellcrank fit bellcrank place Assemble bellcrank mount model check free operation Throttle bellcranks available LR Products Ltd 7787 Archdale Ave Detroit MI 48228 Order upright short-span type Notch fuselage hardwood block carries /s-in hook release pin Glue 1As ply plates fuselage drill hook bearing stop stop should limit hook 450 angle hook released Install bellcrank pushrod hook release mechanism after finishing model 168 Model Aviation us Pasadena mm ItsaS Admission $600 dren under 6 FREE adult Win RIC System 1st Trophies 2nd & 3rd Covering finishing Except chrome yellow top surface upper wing entire model silver Since struts separate upper wing yellow accent easy apply wings can covered silkspan tissue silk nylon iron-on plastic fabric Subsequent finishing operations will depend material chosen wont go details Add details such windshield paint cockpit black guns gunsight radio mast aileron stripes decorations complete upper wing has mounted put Loctite thin Hot Stuff wire/tube joints help hold struts place Flying For test-flying balance model shown plan up 1/2 ifl further forward Mount engine far forward possible best balance maximum tank space can experiment wing incidence balance point settings optimal performance under certain conditions slightly thicker fully symmetrical airfoils both wings Seahawk may show some modest stunt performance sport flying use 55- 70-ft control lines See ALMA Competition Regulations handbook recommendations control line wire diameters pull-testing etc Happy flying Address correspondence 1237 5 Grant St Tacoma WA 98405 ED GOOD AIRMEN Ltgflter PtbAn Baud da Bust Pilot KitMade USA #1081/8 scaIe.$695 #1061/6 scale #105-1/5 scale #1041/4 scale #103-1/3 scale.1595 #3081/8 jet695 #307 1/7 jet795 L V Lie tm FAX 315 5484099 Full Body Pilot Kit #206-1/6 scaIe.$ 995 #205-1/5 scale.1095 #204114 scale.1195 #203-1/3 scale.1795 Cotarns Pilot head hads Pools helmet cap goggles full templates altO easy Soo sImple ssmg teqoltee ORDERING INSTRIJOTIONS see year dealer first Ot oeder direct Add 5100 shipping RIPS Residents edd 7% lao Cheph 0 Mosey Orde THE AIRPLANE FACTORY INC 1880 PINE VIEW MANDEVILLE LA 70448 504-626-7840 FREE CATALOG R/C Combat Crash Resistant 48 wingspan 4A -5 lbs Aluminum lundiog Gene Video 4 P & H $295 LIST $8995 MC e COD 1 800 264 7840 Kombat 4Qtt member quick building exiremely durable Armadillo series Made aluminum polypropelyne no foam can assembled engine mounted radio installed hour Nothing extra buy provide 4 channel radio / 25-40 engine supply everything else great sports plane fully aerobatic bolt-on symmetrical wing pre-hinged pre-finished red biue orange yellow compared other aimost ready fly designs take 10-12 hours longer complete Kombat 40 true winner ORDER YOURS TODAVI Trainer Version available $7495 t Flying Flys hour SCRATCHBUILD 14 SCALE PLANS ae8u pilee CESSNA AG WAGON 1235 4 sssS34OO CESSNA U206TU206 lo75 5 osS87OC CESSNA 152 AEROBAT 99s 3 msS3SOO PIPER PAWNEEios 4 sanSS4OC TRANSA VIA AIRTRUK 1178 5 osS37OO EDO FLOATS[v32]Tsa 2 unSWSOC EDO AMPHIB FLOATS 61 3 sasSSSOC Add PSPsas$53-OO Snarfane ms856-OO Afransail FREE Degasmeastatjoas plasas Photographs available PHONE 032128192 VISA & MASTERCARD Welcome J SEND as3 go Eon COMPLETE LISPING uLL PLANS BOOKS eaaPeoDLCTs SEROICEs SENT FREE WIPe ALL ORDERS NEW ZEALAND AERO PRODUCTS 3d WAf U PABADE SPIRLINS POINT ELUPE NOW ZEALAND Conlrol Line Version Also Available Gail Today Dealer Inquiries Welcome
Edition: Model Aviation - 1992/12
Page Numbers: 92, 95, 166, 167, 168, 169
This 42-oz 37in-wingspan replica last Curtiss Seahawks adapts Navy Carrier Profile Scale events U Bill Darkow John Hall SOUNDS nostalgia highpitched whine inertia starter sliding down scale pilot kicks big radial engine coughs barks settles ragged rumblesounds beloved true biplane fans real airplanes have two wings round engines apart special breed enthusiast people air shows today show interest early biplanes todays sophisticated high-tech streamliners Its special character colorful personalities two-wingers both ground air really grab attention youd like build fly attractive multipurpose model captures nostalgic spirit adventure romance associated biplanes consider control line version Curtiss XF7C-3 Seahawk few modifica tions design can compete either Profile Scale Navy Carrier eventsand its just plain fun fly Besides carrying name famous Seattle football team Seahawk has much recommend iteven touch mystery first Curtiss Seahawk F7C- 1 designed Charles Hathom Native American 1926-27 Navy however Left Versatile model uses OS Max 40 engine Navy Carrier 35-size engine Profile Carrier rejected airplane sea dutyprobably because slower Boeing F2B assigned entire production run 18 planes marines shore-based land planes Since F7C- 1 eligible scale bonus points under AMA Navy Carrier rules story might have ended discovered XF7C-3 November 1935 Model Airplane News three-view Wylam showed airplane arresting hook carried notation made curious Plans photographs information model unobtainable Returning original source Pete Bowerss Curtiss Aircraft 1917-1 947 found no mention XF7C-3 Could have Stealth fighter its day no official existence notation Wylam drawing F7C-1 December 1963 MAN supplied answer Models XF7C-2 XF7C-3 Curtiss projects US Navy export markets XF7C-3 built under wraps China demonstration Frank Hawks its maiden flight caught fire destroyed landing killing Lawrence McLelland famous model builder 1925-1930 era fatal crash total loss XF7C-3 ended further development Continued page 95 92 Model Aviation e Seahawk XF7C-3 ready action Authors friend John Hall installed hook release mechanism opposite side variant Curtiss SeahawklDarkow Continued page 92 Seahawk series design features reappeared F8C-4 XFlOC-l Fl ic-i Heildiver Goshawk Apparently XF7C-3 secret no official company records available Pete Bowers reference compiling book Furthermore airplane equipped carrier operation though China no carriers Makes wonder what going youd like copy three-view November 1935 Model Airplane News December 1963 MAN SASE address end article will get Construction Two XF7C-3 prototype models have thoroughly tested flown John Hall fellow Seattle Skyraider finished time compete Pacific Northwest Regional Control Line Championships Eugene Oregon Johns Seahawk didnt win its unique design attracted lot attention Further refinement should make model contender As might expect John differences opinion about some featureschiefly landing gear wing strut design landing gear truer scale Johns simpler center strut attachment Johns model truer scale simpler still arguing over outboard strut design easier build truer scale control line model Profile Scale biplane Navy Carrier presented some unique challenges Generally favored simplicity construction over fidelity scale also took care compromise scale accuracy little possible Fuselage fuselage can made single piece x 36-in mediumweight balsa trick lay out fuselage halves top bottom positioning outlines two parts tailto-tail configuration outlines overlapping Its less expensive using two sheets Use outside edges sheet joint between halves Cut openings hellcrank engine landing gear center strut mounts using 3/g x -in engine mount stock well lower wing Cutting out bellcrank engine mount openings produces loose piece between bellcrank engine will have glued assemble fuselage halves Note lower wing has 2 positive incidence Glue wing center strut mounting blocks together Drill tap blocks Continued page 166 Wing strut detail Strut right has tubes wires installed 12 ply strips cut facings placed nearby Assembly left has trimmed 12 facings installed diagonal strut show overlap reinforce joint between struts core pieces Note imbedded tubes wires mber 1992 95 Left top bottom fuselage halves have joined opening bellcrank cut out engine mount landing gear mount wing mount installed upper wing top actually four inches longer lower wing Note missing gussets lower wing Right basic assemblies ready installation wing struts model shown upside down cardboard templates fitted between wings hold exactly parallel N-struts being installed Rubberbands looped over wings struts maintain slight tension prevent shifting Note photo right steamlined aluminum-tube center struts have installed -20 nylon bolts glue fuselage halves along engine landing gear mounts see plan lower landing gear mount should shaped before gluing Glue fuselage halves together along centerline Cut slot horizontal stabilizer Cut opening install tailwheel mounting block wire Above Wheel fairing detail -in ply inset shown left cutout backside fairing gear leg 1/16 ply insert right Cut /16 ply nose doublers shape openings engine belicrank lower wing Note additional /16 ply cowl cheek glued over engine cutout left side model may instead use either 3A2 /8-in ply doublers have found however large forward area provides plenty strength A6 ply saves weight Wings Make wing rib patterns metal plywood Cut ribs except center rib upper wing two sheets /s x 3 x 36-in balsa Use /8-in ply center rib Note three center section ribs wing modified /16 planking -in-sq stub spar /s-in ply brace spruce wing mounting blocks Stack upper lower wing ribs separate pieces -in-sq spruce spar material Pin ribs together sand uniform correct shape Build leading trailing edges upper wing three pieces cutting horizontal notches match four A-in ply gussets gluing gussets make sure leading trailing edges flat no dihedral have built identical sweepback Use scrap balsa prop up leading trailing edges building center section upper wing Slide ribs onto stub spar space correctly Check alignment glue ribs between leading trailing edges Shape spruce blocks fit top center section ribs Glue blocks place glue has set turu assembly over recheck alignment glue shaped spruce blocks center section planking bottom upper wing completes upper wing center section Pin assembly back down building board prop up again recheck alignment Cut correct angles /4-in-sq left right spruce spars Note wing stub spar 166 Model Aviation Landing gear installation 1/16 ply insert has flushmounted epoxied place outboard wheel Note -in Lite Ply filler between wire gear legs SeahawklDarkow Continued page 95 John Hall holds own authors Seahawks Darkows left Both versions have tested flown Now its Darkows turn time Close-up tail hook release mechanism John Halls model dont need Halls model left Hall entered sport flying Profile Scale Hall also modified parts shown landing gear Pacific NW Regional CL Champs center strut attachment outboard wing N-strut design Full-Size Plans Available Page 178 Ce sa URSTACEV I/ODDUTEPLY SESUAP SPARACER ADA SCRRICSPLICE IROTTON UBBD ZIRRIOENiiiANDPATIABACI DEANE NICUNTSAlI N DCTAB PA N SU NE U NANAN D D A CU PAREDCNRRNENENN PA/NTTDN PA PA N NBRER ENS GSPAN APP3CTR~D LOWER-53 j AREA-370 Si 42 OB CISC NDTAR TERUTTUNCOLORS AlERT ERPRyI IPSigRiB & TEP El UPPET WiSg -CIWERN YBIIEBD DNBiqRB4 Bout B FISSEn Bill DEkESN B John HEll 1991 PIOSB DrOWn Bill DarkDDw7/91 joint detail pieces carbon fiber should work well Slide ribs onto spars Note first rib requires additional cutout receive stub spar Also note joined leading trailing edges efficiently possible ribs will require slight chamfer Space ribs correctly check wing alignment glue ribs between leading trailing edges glue has set remove upper wing assembly board add shape wing tips Note tips notched receive spar Cut four 3/ x 1/2-in spruce N-strut mounting blocks shape Drill center block 1/s-in-OD 3/s-in-long brass tubes Mount tubes Carefully position blocks between ribs flush bottom wing making sure holes aligned 3-in centers Glue blocks place Carefully mark locations vertical holes upper wing center section mounting blocks holes accept x 20 x 2/2-in nylon mounting bolts Drill holes aligning 3-in centers match mounting blocks fuselage used -in spade bit slightly relieve tops holes heads mounting bolts would seated flush top wing completes upper wing structure Since lower wing has no sweepback outer panels built piece Glue 1/s-in ply brace center leading edge glue -in-sq spruce stub spar trailing edge shown plan Prop pin leading trailing edges place Slide ribs main spar spacing correctly Check wing alignment glue ribs between leading trailing edges glue has set remove lower wing assembly board Plank center section top bottom Add gussets wing tips Shape wing tips countersink ounce lead outboard tip Cut spruce N-strut mounting blocks shape Drill block 3/i-in-long 1/s-in-OD brass tubes Install tubes glue blocks between ribs flush top wing Note rear block oles aligned 27/s-in centers lower wing now structurally complete Drill mounting holes bellcrank Glue lower wing place making sure its right angles fuselage sighting top front Check correct positive incidence Temporarily install upper wing using nylon bolts center section struts make sure lower wing aligned upper viewed above Type Golden Age design adaptable both Navy Carrier Profile Scale events Wingspan 37 inches Recommended engine size type OS Max 40 Class Navy Carrier 36-size engine Profile Carrier 29- 45-size sport flying Expected flying weight 42 ounces Type construction Built-up wing sheet balsa fuselage tail surfaces Type covering/finish recommended Paint Covering choice silkspan silk nylon ironon film fabric December 1992 167 V /C 55 SEBEDE STUD SPED- IAILDEO~ToTLISE wing tips templates needed keep wings exactly parallel fit N-struts Loop rubberbands over wings templates maintain slight tension prevent shifting struts being fitted Cut four 3/s-in-wide upright struts /s-in Lite Ply trimming fit between strut mounting holes shown plan Cut /s-in-wide -in-deep slots ends strut glue piece 1/2-inlong /8-in-OD brass tubing slot Cut eight l-in-Iong pieces music wire make slip fit inside tubes Bend piece wire slightly middle holding strut place fit wire end struts proper mounting Wing struts center section struts simply two short pieces standard 5/8-in streamlined aluminum strut tubing readily available well-stocked hobby shop Cut struts length shown shape fit wing camber glued A2 ply pads bottom upper wing additional bearing struts upper wing should 00 incidence installed nylon bolts tightened incidence can adjusted either inserting shims slightly changing length struts N-struts easier build describe both wings installed cut pair matching cardboard templates fit between wings slide over Static Display Models FREE Model Airplane Building Lessons RADIO CONTROLLED CARS S PLANES COPTERS NS FOR SHOW INFORMATION PHONE 714723-6057 Fax 7147230913 SWAP SHOP call Red 209-931-0214 GIANT RAFFLE Advance Admission Tickets Available International Modeler Shows Inc Dept E 10127 Costa Mesa CA 92627 holes wings wings should flex enough permit operation wires floating freely tubes mounted struts wings will self-align have finished fitting four upright struts little patience care called recheck wing alignment cut fit 1/s-in Lite Ply diagonal struts glue place N-struts should fit perfectly Run thin variety Hot Stuff wire/tube joints strut secure wires Remove N-struts glue 1/32 ply facings side Overlap upright/ diagonal joint strength An alteruative method securing N-struts drill across end upright struts bolt screw eyes eye bolts mounting blocks method permits adjust incidence unless bent metal fitting added ends N-struts allow mounting scaleangledway its still easier install vertically upper wing N-strut mounting blocks would have moved rib section inboard vertical installation Landing gear Drill two 5A2 holes landing gear mount shown plan Install -in lengths 5h2-OD brass tubing holes Bend four pieces /32 music wire shape shown used K&S Engineering Mini Wire Bender Fit landing gear wires tubes mount nylon clamps wrap solder shown Install 1R-in Lite Ply filler wheel fairings open-faced Make -in -in balsa glued together /s-in ply insert trimmed shape Notch insides receive landing gear legs shown plan Epoxy fairings place cover notch made landing gear wires piece /16 ply cover should flush fit An alteruative shaped aluminum landing gear available $10 Tom Dixon PO Box 671166 Marietta GA 30066 order line 404 973-0004 sure order small profile gear shaped aluminum gear much simpler mount fuselage adding wheel fairings becomes complicated Bellcrank/book release Cut bend bellcrank mounts shape Drill mounts bellcrank fit bellcrank place Assemble bellcrank mount model check free operation Throttle bellcranks available LR Products Ltd 7787 Archdale Ave Detroit MI 48228 Order upright short-span type Notch fuselage hardwood block carries /s-in hook release pin Glue 1As ply plates fuselage drill hook bearing stop stop should limit hook 450 angle hook released Install bellcrank pushrod hook release mechanism after finishing model 168 Model Aviation us Pasadena mm ItsaS Admission $600 dren under 6 FREE adult Win RIC System 1st Trophies 2nd & 3rd Covering finishing Except chrome yellow top surface upper wing entire model silver Since struts separate upper wing yellow accent easy apply wings can covered silkspan tissue silk nylon iron-on plastic fabric Subsequent finishing operations will depend material chosen wont go details Add details such windshield paint cockpit black guns gunsight radio mast aileron stripes decorations complete upper wing has mounted put Loctite thin Hot Stuff wire/tube joints help hold struts place Flying For test-flying balance model shown plan up 1/2 ifl further forward Mount engine far forward possible best balance maximum tank space can experiment wing incidence balance point settings optimal performance under certain conditions slightly thicker fully symmetrical airfoils both wings Seahawk may show some modest stunt performance sport flying use 55- 70-ft control lines See ALMA Competition Regulations handbook recommendations control line wire diameters pull-testing etc Happy flying Address correspondence 1237 5 Grant St Tacoma WA 98405 ED GOOD AIRMEN Ltgflter PtbAn Baud da Bust Pilot KitMade USA #1081/8 scaIe.$695 #1061/6 scale #105-1/5 scale #1041/4 scale #103-1/3 scale.1595 #3081/8 jet695 #307 1/7 jet795 L V Lie tm FAX 315 5484099 Full Body Pilot Kit #206-1/6 scaIe.$ 995 #205-1/5 scale.1095 #204114 scale.1195 #203-1/3 scale.1795 Cotarns Pilot head hads Pools helmet cap goggles full templates altO easy Soo sImple ssmg teqoltee ORDERING INSTRIJOTIONS see year dealer first Ot oeder direct Add 5100 shipping RIPS Residents edd 7% lao Cheph 0 Mosey Orde THE AIRPLANE FACTORY INC 1880 PINE VIEW MANDEVILLE LA 70448 504-626-7840 FREE CATALOG R/C Combat Crash Resistant 48 wingspan 4A -5 lbs Aluminum lundiog Gene Video 4 P & H $295 LIST $8995 MC e COD 1 800 264 7840 Kombat 4Qtt member quick building exiremely durable Armadillo series Made aluminum polypropelyne no foam can assembled engine mounted radio installed hour Nothing extra buy provide 4 channel radio / 25-40 engine supply everything else great sports plane fully aerobatic bolt-on symmetrical wing pre-hinged pre-finished red biue orange yellow compared other aimost ready fly designs take 10-12 hours longer complete Kombat 40 true winner ORDER YOURS TODAVI Trainer Version available $7495 t Flying Flys hour SCRATCHBUILD 14 SCALE PLANS ae8u pilee CESSNA AG WAGON 1235 4 sssS34OO CESSNA U206TU206 lo75 5 osS87OC CESSNA 152 AEROBAT 99s 3 msS3SOO PIPER PAWNEEios 4 sanSS4OC TRANSA VIA AIRTRUK 1178 5 osS37OO EDO FLOATS[v32]Tsa 2 unSWSOC EDO AMPHIB FLOATS 61 3 sasSSSOC Add PSPsas$53-OO Snarfane ms856-OO Afransail FREE Degasmeastatjoas plasas Photographs available PHONE 032128192 VISA & MASTERCARD Welcome J SEND as3 go Eon COMPLETE LISPING uLL PLANS BOOKS eaaPeoDLCTs SEROICEs SENT FREE WIPe ALL ORDERS NEW ZEALAND AERO PRODUCTS 3d WAf U PABADE SPIRLINS POINT ELUPE NOW ZEALAND Conlrol Line Version Also Available Gail Today Dealer Inquiries Welcome
Edition: Model Aviation - 1992/12
Page Numbers: 92, 95, 166, 167, 168, 169
This 42-oz 37in-wingspan replica last Curtiss Seahawks adapts Navy Carrier Profile Scale events U Bill Darkow John Hall SOUNDS nostalgia highpitched whine inertia starter sliding down scale pilot kicks big radial engine coughs barks settles ragged rumblesounds beloved true biplane fans real airplanes have two wings round engines apart special breed enthusiast people air shows today show interest early biplanes todays sophisticated high-tech streamliners Its special character colorful personalities two-wingers both ground air really grab attention youd like build fly attractive multipurpose model captures nostalgic spirit adventure romance associated biplanes consider control line version Curtiss XF7C-3 Seahawk few modifica tions design can compete either Profile Scale Navy Carrier eventsand its just plain fun fly Besides carrying name famous Seattle football team Seahawk has much recommend iteven touch mystery first Curtiss Seahawk F7C- 1 designed Charles Hathom Native American 1926-27 Navy however Left Versatile model uses OS Max 40 engine Navy Carrier 35-size engine Profile Carrier rejected airplane sea dutyprobably because slower Boeing F2B assigned entire production run 18 planes marines shore-based land planes Since F7C- 1 eligible scale bonus points under AMA Navy Carrier rules story might have ended discovered XF7C-3 November 1935 Model Airplane News three-view Wylam showed airplane arresting hook carried notation made curious Plans photographs information model unobtainable Returning original source Pete Bowerss Curtiss Aircraft 1917-1 947 found no mention XF7C-3 Could have Stealth fighter its day no official existence notation Wylam drawing F7C-1 December 1963 MAN supplied answer Models XF7C-2 XF7C-3 Curtiss projects US Navy export markets XF7C-3 built under wraps China demonstration Frank Hawks its maiden flight caught fire destroyed landing killing Lawrence McLelland famous model builder 1925-1930 era fatal crash total loss XF7C-3 ended further development Continued page 95 92 Model Aviation e Seahawk XF7C-3 ready action Authors friend John Hall installed hook release mechanism opposite side variant Curtiss SeahawklDarkow Continued page 92 Seahawk series design features reappeared F8C-4 XFlOC-l Fl ic-i Heildiver Goshawk Apparently XF7C-3 secret no official company records available Pete Bowers reference compiling book Furthermore airplane equipped carrier operation though China no carriers Makes wonder what going youd like copy three-view November 1935 Model Airplane News December 1963 MAN SASE address end article will get Construction Two XF7C-3 prototype models have thoroughly tested flown John Hall fellow Seattle Skyraider finished time compete Pacific Northwest Regional Control Line Championships Eugene Oregon Johns Seahawk didnt win its unique design attracted lot attention Further refinement should make model contender As might expect John differences opinion about some featureschiefly landing gear wing strut design landing gear truer scale Johns simpler center strut attachment Johns model truer scale simpler still arguing over outboard strut design easier build truer scale control line model Profile Scale biplane Navy Carrier presented some unique challenges Generally favored simplicity construction over fidelity scale also took care compromise scale accuracy little possible Fuselage fuselage can made single piece x 36-in mediumweight balsa trick lay out fuselage halves top bottom positioning outlines two parts tailto-tail configuration outlines overlapping Its less expensive using two sheets Use outside edges sheet joint between halves Cut openings hellcrank engine landing gear center strut mounts using 3/g x -in engine mount stock well lower wing Cutting out bellcrank engine mount openings produces loose piece between bellcrank engine will have glued assemble fuselage halves Note lower wing has 2 positive incidence Glue wing center strut mounting blocks together Drill tap blocks Continued page 166 Wing strut detail Strut right has tubes wires installed 12 ply strips cut facings placed nearby Assembly left has trimmed 12 facings installed diagonal strut show overlap reinforce joint between struts core pieces Note imbedded tubes wires mber 1992 95 Left top bottom fuselage halves have joined opening bellcrank cut out engine mount landing gear mount wing mount installed upper wing top actually four inches longer lower wing Note missing gussets lower wing Right basic assemblies ready installation wing struts model shown upside down cardboard templates fitted between wings hold exactly parallel N-struts being installed Rubberbands looped over wings struts maintain slight tension prevent shifting Note photo right steamlined aluminum-tube center struts have installed -20 nylon bolts glue fuselage halves along engine landing gear mounts see plan lower landing gear mount should shaped before gluing Glue fuselage halves together along centerline Cut slot horizontal stabilizer Cut opening install tailwheel mounting block wire Above Wheel fairing detail -in ply inset shown left cutout backside fairing gear leg 1/16 ply insert right Cut /16 ply nose doublers shape openings engine belicrank lower wing Note additional /16 ply cowl cheek glued over engine cutout left side model may instead use either 3A2 /8-in ply doublers have found however large forward area provides plenty strength A6 ply saves weight Wings Make wing rib patterns metal plywood Cut ribs except center rib upper wing two sheets /s x 3 x 36-in balsa Use /8-in ply center rib Note three center section ribs wing modified /16 planking -in-sq stub spar /s-in ply brace spruce wing mounting blocks Stack upper lower wing ribs separate pieces -in-sq spruce spar material Pin ribs together sand uniform correct shape Build leading trailing edges upper wing three pieces cutting horizontal notches match four A-in ply gussets gluing gussets make sure leading trailing edges flat no dihedral have built identical sweepback Use scrap balsa prop up leading trailing edges building center section upper wing Slide ribs onto stub spar space correctly Check alignment glue ribs between leading trailing edges Shape spruce blocks fit top center section ribs Glue blocks place glue has set turu assembly over recheck alignment glue shaped spruce blocks center section planking bottom upper wing completes upper wing center section Pin assembly back down building board prop up again recheck alignment Cut correct angles /4-in-sq left right spruce spars Note wing stub spar 166 Model Aviation Landing gear installation 1/16 ply insert has flushmounted epoxied place outboard wheel Note -in Lite Ply filler between wire gear legs SeahawklDarkow Continued page 95 John Hall holds own authors Seahawks Darkows left Both versions have tested flown Now its Darkows turn time Close-up tail hook release mechanism John Halls model dont need Halls model left Hall entered sport flying Profile Scale Hall also modified parts shown landing gear Pacific NW Regional CL Champs center strut attachment outboard wing N-strut design Full-Size Plans Available Page 178 Ce sa URSTACEV I/ODDUTEPLY SESUAP SPARACER ADA SCRRICSPLICE IROTTON UBBD ZIRRIOENiiiANDPATIABACI DEANE NICUNTSAlI N DCTAB PA N SU NE U NANAN D D A CU PAREDCNRRNENENN PA/NTTDN PA PA N NBRER ENS GSPAN APP3CTR~D LOWER-53 j AREA-370 Si 42 OB CISC NDTAR TERUTTUNCOLORS AlERT ERPRyI IPSigRiB & TEP El UPPET WiSg -CIWERN YBIIEBD DNBiqRB4 Bout B FISSEn Bill DEkESN B John HEll 1991 PIOSB DrOWn Bill DarkDDw7/91 joint detail pieces carbon fiber should work well Slide ribs onto spars Note first rib requires additional cutout receive stub spar Also note joined leading trailing edges efficiently possible ribs will require slight chamfer Space ribs correctly check wing alignment glue ribs between leading trailing edges glue has set remove upper wing assembly board add shape wing tips Note tips notched receive spar Cut four 3/ x 1/2-in spruce N-strut mounting blocks shape Drill center block 1/s-in-OD 3/s-in-long brass tubes Mount tubes Carefully position blocks between ribs flush bottom wing making sure holes aligned 3-in centers Glue blocks place Carefully mark locations vertical holes upper wing center section mounting blocks holes accept x 20 x 2/2-in nylon mounting bolts Drill holes aligning 3-in centers match mounting blocks fuselage used -in spade bit slightly relieve tops holes heads mounting bolts would seated flush top wing completes upper wing structure Since lower wing has no sweepback outer panels built piece Glue 1/s-in ply brace center leading edge glue -in-sq spruce stub spar trailing edge shown plan Prop pin leading trailing edges place Slide ribs main spar spacing correctly Check wing alignment glue ribs between leading trailing edges glue has set remove lower wing assembly board Plank center section top bottom Add gussets wing tips Shape wing tips countersink ounce lead outboard tip Cut spruce N-strut mounting blocks shape Drill block 3/i-in-long 1/s-in-OD brass tubes Install tubes glue blocks between ribs flush top wing Note rear block oles aligned 27/s-in centers lower wing now structurally complete Drill mounting holes bellcrank Glue lower wing place making sure its right angles fuselage sighting top front Check correct positive incidence Temporarily install upper wing using nylon bolts center section struts make sure lower wing aligned upper viewed above Type Golden Age design adaptable both Navy Carrier Profile Scale events Wingspan 37 inches Recommended engine size type OS Max 40 Class Navy Carrier 36-size engine Profile Carrier 29- 45-size sport flying Expected flying weight 42 ounces Type construction Built-up wing sheet balsa fuselage tail surfaces Type covering/finish recommended Paint Covering choice silkspan silk nylon ironon film fabric December 1992 167 V /C 55 SEBEDE STUD SPED- IAILDEO~ToTLISE wing tips templates needed keep wings exactly parallel fit N-struts Loop rubberbands over wings templates maintain slight tension prevent shifting struts being fitted Cut four 3/s-in-wide upright struts /s-in Lite Ply trimming fit between strut mounting holes shown plan Cut /s-in-wide -in-deep slots ends strut glue piece 1/2-inlong /8-in-OD brass tubing slot Cut eight l-in-Iong pieces music wire make slip fit inside tubes Bend piece wire slightly middle holding strut place fit wire end struts proper mounting Wing struts center section struts simply two short pieces standard 5/8-in streamlined aluminum strut tubing readily available well-stocked hobby shop Cut struts length shown shape fit wing camber glued A2 ply pads bottom upper wing additional bearing struts upper wing should 00 incidence installed nylon bolts tightened incidence can adjusted either inserting shims slightly changing length struts N-struts easier build describe both wings installed cut pair matching cardboard templates fit between wings slide over Static Display Models FREE Model Airplane Building Lessons RADIO CONTROLLED CARS S PLANES COPTERS NS FOR SHOW INFORMATION PHONE 714723-6057 Fax 7147230913 SWAP SHOP call Red 209-931-0214 GIANT RAFFLE Advance Admission Tickets Available International Modeler Shows Inc Dept E 10127 Costa Mesa CA 92627 holes wings wings should flex enough permit operation wires floating freely tubes mounted struts wings will self-align have finished fitting four upright struts little patience care called recheck wing alignment cut fit 1/s-in Lite Ply diagonal struts glue place N-struts should fit perfectly Run thin variety Hot Stuff wire/tube joints strut secure wires Remove N-struts glue 1/32 ply facings side Overlap upright/ diagonal joint strength An alteruative method securing N-struts drill across end upright struts bolt screw eyes eye bolts mounting blocks method permits adjust incidence unless bent metal fitting added ends N-struts allow mounting scaleangledway its still easier install vertically upper wing N-strut mounting blocks would have moved rib section inboard vertical installation Landing gear Drill two 5A2 holes landing gear mount shown plan Install -in lengths 5h2-OD brass tubing holes Bend four pieces /32 music wire shape shown used K&S Engineering Mini Wire Bender Fit landing gear wires tubes mount nylon clamps wrap solder shown Install 1R-in Lite Ply filler wheel fairings open-faced Make -in -in balsa glued together /s-in ply insert trimmed shape Notch insides receive landing gear legs shown plan Epoxy fairings place cover notch made landing gear wires piece /16 ply cover should flush fit An alteruative shaped aluminum landing gear available $10 Tom Dixon PO Box 671166 Marietta GA 30066 order line 404 973-0004 sure order small profile gear shaped aluminum gear much simpler mount fuselage adding wheel fairings becomes complicated Bellcrank/book release Cut bend bellcrank mounts shape Drill mounts bellcrank fit bellcrank place Assemble bellcrank mount model check free operation Throttle bellcranks available LR Products Ltd 7787 Archdale Ave Detroit MI 48228 Order upright short-span type Notch fuselage hardwood block carries /s-in hook release pin Glue 1As ply plates fuselage drill hook bearing stop stop should limit hook 450 angle hook released Install bellcrank pushrod hook release mechanism after finishing model 168 Model Aviation us Pasadena mm ItsaS Admission $600 dren under 6 FREE adult Win RIC System 1st Trophies 2nd & 3rd Covering finishing Except chrome yellow top surface upper wing entire model silver Since struts separate upper wing yellow accent easy apply wings can covered silkspan tissue silk nylon iron-on plastic fabric Subsequent finishing operations will depend material chosen wont go details Add details such windshield paint cockpit black guns gunsight radio mast aileron stripes decorations complete upper wing has mounted put Loctite thin Hot Stuff wire/tube joints help hold struts place Flying For test-flying balance model shown plan up 1/2 ifl further forward Mount engine far forward possible best balance maximum tank space can experiment wing incidence balance point settings optimal performance under certain conditions slightly thicker fully symmetrical airfoils both wings Seahawk may show some modest stunt performance sport flying use 55- 70-ft control lines See ALMA Competition Regulations handbook recommendations control line wire diameters pull-testing etc Happy flying Address correspondence 1237 5 Grant St Tacoma WA 98405 ED GOOD AIRMEN Ltgflter PtbAn Baud da Bust Pilot KitMade USA #1081/8 scaIe.$695 #1061/6 scale #105-1/5 scale #1041/4 scale #103-1/3 scale.1595 #3081/8 jet695 #307 1/7 jet795 L V Lie tm FAX 315 5484099 Full Body Pilot Kit #206-1/6 scaIe.$ 995 #205-1/5 scale.1095 #204114 scale.1195 #203-1/3 scale.1795 Cotarns Pilot head hads Pools helmet cap goggles full templates altO easy Soo sImple ssmg teqoltee ORDERING INSTRIJOTIONS see year dealer first Ot oeder direct Add 5100 shipping RIPS Residents edd 7% lao Cheph 0 Mosey Orde THE AIRPLANE FACTORY INC 1880 PINE VIEW MANDEVILLE LA 70448 504-626-7840 FREE CATALOG R/C Combat Crash Resistant 48 wingspan 4A -5 lbs Aluminum lundiog Gene Video 4 P & H $295 LIST $8995 MC e COD 1 800 264 7840 Kombat 4Qtt member quick building exiremely durable Armadillo series Made aluminum polypropelyne no foam can assembled engine mounted radio installed hour Nothing extra buy provide 4 channel radio / 25-40 engine supply everything else great sports plane fully aerobatic bolt-on symmetrical wing pre-hinged pre-finished red biue orange yellow compared other aimost ready fly designs take 10-12 hours longer complete Kombat 40 true winner ORDER YOURS TODAVI Trainer Version available $7495 t Flying Flys hour SCRATCHBUILD 14 SCALE PLANS ae8u pilee CESSNA AG WAGON 1235 4 sssS34OO CESSNA U206TU206 lo75 5 osS87OC CESSNA 152 AEROBAT 99s 3 msS3SOO PIPER PAWNEEios 4 sanSS4OC TRANSA VIA AIRTRUK 1178 5 osS37OO EDO FLOATS[v32]Tsa 2 unSWSOC EDO AMPHIB FLOATS 61 3 sasSSSOC Add PSPsas$53-OO Snarfane ms856-OO Afransail FREE Degasmeastatjoas plasas Photographs available PHONE 032128192 VISA & MASTERCARD Welcome J SEND as3 go Eon COMPLETE LISPING uLL PLANS BOOKS eaaPeoDLCTs SEROICEs SENT FREE WIPe ALL ORDERS NEW ZEALAND AERO PRODUCTS 3d WAf U PABADE SPIRLINS POINT ELUPE NOW ZEALAND Conlrol Line Version Also Available Gail Today Dealer Inquiries Welcome
Edition: Model Aviation - 1992/12
Page Numbers: 92, 95, 166, 167, 168, 169
This 42-oz 37in-wingspan replica last Curtiss Seahawks adapts Navy Carrier Profile Scale events U Bill Darkow John Hall SOUNDS nostalgia highpitched whine inertia starter sliding down scale pilot kicks big radial engine coughs barks settles ragged rumblesounds beloved true biplane fans real airplanes have two wings round engines apart special breed enthusiast people air shows today show interest early biplanes todays sophisticated high-tech streamliners Its special character colorful personalities two-wingers both ground air really grab attention youd like build fly attractive multipurpose model captures nostalgic spirit adventure romance associated biplanes consider control line version Curtiss XF7C-3 Seahawk few modifica tions design can compete either Profile Scale Navy Carrier eventsand its just plain fun fly Besides carrying name famous Seattle football team Seahawk has much recommend iteven touch mystery first Curtiss Seahawk F7C- 1 designed Charles Hathom Native American 1926-27 Navy however Left Versatile model uses OS Max 40 engine Navy Carrier 35-size engine Profile Carrier rejected airplane sea dutyprobably because slower Boeing F2B assigned entire production run 18 planes marines shore-based land planes Since F7C- 1 eligible scale bonus points under AMA Navy Carrier rules story might have ended discovered XF7C-3 November 1935 Model Airplane News three-view Wylam showed airplane arresting hook carried notation made curious Plans photographs information model unobtainable Returning original source Pete Bowerss Curtiss Aircraft 1917-1 947 found no mention XF7C-3 Could have Stealth fighter its day no official existence notation Wylam drawing F7C-1 December 1963 MAN supplied answer Models XF7C-2 XF7C-3 Curtiss projects US Navy export markets XF7C-3 built under wraps China demonstration Frank Hawks its maiden flight caught fire destroyed landing killing Lawrence McLelland famous model builder 1925-1930 era fatal crash total loss XF7C-3 ended further development Continued page 95 92 Model Aviation e Seahawk XF7C-3 ready action Authors friend John Hall installed hook release mechanism opposite side variant Curtiss SeahawklDarkow Continued page 92 Seahawk series design features reappeared F8C-4 XFlOC-l Fl ic-i Heildiver Goshawk Apparently XF7C-3 secret no official company records available Pete Bowers reference compiling book Furthermore airplane equipped carrier operation though China no carriers Makes wonder what going youd like copy three-view November 1935 Model Airplane News December 1963 MAN SASE address end article will get Construction Two XF7C-3 prototype models have thoroughly tested flown John Hall fellow Seattle Skyraider finished time compete Pacific Northwest Regional Control Line Championships Eugene Oregon Johns Seahawk didnt win its unique design attracted lot attention Further refinement should make model contender As might expect John differences opinion about some featureschiefly landing gear wing strut design landing gear truer scale Johns simpler center strut attachment Johns model truer scale simpler still arguing over outboard strut design easier build truer scale control line model Profile Scale biplane Navy Carrier presented some unique challenges Generally favored simplicity construction over fidelity scale also took care compromise scale accuracy little possible Fuselage fuselage can made single piece x 36-in mediumweight balsa trick lay out fuselage halves top bottom positioning outlines two parts tailto-tail configuration outlines overlapping Its less expensive using two sheets Use outside edges sheet joint between halves Cut openings hellcrank engine landing gear center strut mounts using 3/g x -in engine mount stock well lower wing Cutting out bellcrank engine mount openings produces loose piece between bellcrank engine will have glued assemble fuselage halves Note lower wing has 2 positive incidence Glue wing center strut mounting blocks together Drill tap blocks Continued page 166 Wing strut detail Strut right has tubes wires installed 12 ply strips cut facings placed nearby Assembly left has trimmed 12 facings installed diagonal strut show overlap reinforce joint between struts core pieces Note imbedded tubes wires mber 1992 95 Left top bottom fuselage halves have joined opening bellcrank cut out engine mount landing gear mount wing mount installed upper wing top actually four inches longer lower wing Note missing gussets lower wing Right basic assemblies ready installation wing struts model shown upside down cardboard templates fitted between wings hold exactly parallel N-struts being installed Rubberbands looped over wings struts maintain slight tension prevent shifting Note photo right steamlined aluminum-tube center struts have installed -20 nylon bolts glue fuselage halves along engine landing gear mounts see plan lower landing gear mount should shaped before gluing Glue fuselage halves together along centerline Cut slot horizontal stabilizer Cut opening install tailwheel mounting block wire Above Wheel fairing detail -in ply inset shown left cutout backside fairing gear leg 1/16 ply insert right Cut /16 ply nose doublers shape openings engine belicrank lower wing Note additional /16 ply cowl cheek glued over engine cutout left side model may instead use either 3A2 /8-in ply doublers have found however large forward area provides plenty strength A6 ply saves weight Wings Make wing rib patterns metal plywood Cut ribs except center rib upper wing two sheets /s x 3 x 36-in balsa Use /8-in ply center rib Note three center section ribs wing modified /16 planking -in-sq stub spar /s-in ply brace spruce wing mounting blocks Stack upper lower wing ribs separate pieces -in-sq spruce spar material Pin ribs together sand uniform correct shape Build leading trailing edges upper wing three pieces cutting horizontal notches match four A-in ply gussets gluing gussets make sure leading trailing edges flat no dihedral have built identical sweepback Use scrap balsa prop up leading trailing edges building center section upper wing Slide ribs onto stub spar space correctly Check alignment glue ribs between leading trailing edges Shape spruce blocks fit top center section ribs Glue blocks place glue has set turu assembly over recheck alignment glue shaped spruce blocks center section planking bottom upper wing completes upper wing center section Pin assembly back down building board prop up again recheck alignment Cut correct angles /4-in-sq left right spruce spars Note wing stub spar 166 Model Aviation Landing gear installation 1/16 ply insert has flushmounted epoxied place outboard wheel Note -in Lite Ply filler between wire gear legs SeahawklDarkow Continued page 95 John Hall holds own authors Seahawks Darkows left Both versions have tested flown Now its Darkows turn time Close-up tail hook release mechanism John Halls model dont need Halls model left Hall entered sport flying Profile Scale Hall also modified parts shown landing gear Pacific NW Regional CL Champs center strut attachment outboard wing N-strut design Full-Size Plans Available Page 178 Ce sa URSTACEV I/ODDUTEPLY SESUAP SPARACER ADA SCRRICSPLICE IROTTON UBBD ZIRRIOENiiiANDPATIABACI DEANE NICUNTSAlI N DCTAB PA N SU NE U NANAN D D A CU PAREDCNRRNENENN PA/NTTDN PA PA N NBRER ENS GSPAN APP3CTR~D LOWER-53 j AREA-370 Si 42 OB CISC NDTAR TERUTTUNCOLORS AlERT ERPRyI IPSigRiB & TEP El UPPET WiSg -CIWERN YBIIEBD DNBiqRB4 Bout B FISSEn Bill DEkESN B John HEll 1991 PIOSB DrOWn Bill DarkDDw7/91 joint detail pieces carbon fiber should work well Slide ribs onto spars Note first rib requires additional cutout receive stub spar Also note joined leading trailing edges efficiently possible ribs will require slight chamfer Space ribs correctly check wing alignment glue ribs between leading trailing edges glue has set remove upper wing assembly board add shape wing tips Note tips notched receive spar Cut four 3/ x 1/2-in spruce N-strut mounting blocks shape Drill center block 1/s-in-OD 3/s-in-long brass tubes Mount tubes Carefully position blocks between ribs flush bottom wing making sure holes aligned 3-in centers Glue blocks place Carefully mark locations vertical holes upper wing center section mounting blocks holes accept x 20 x 2/2-in nylon mounting bolts Drill holes aligning 3-in centers match mounting blocks fuselage used -in spade bit slightly relieve tops holes heads mounting bolts would seated flush top wing completes upper wing structure Since lower wing has no sweepback outer panels built piece Glue 1/s-in ply brace center leading edge glue -in-sq spruce stub spar trailing edge shown plan Prop pin leading trailing edges place Slide ribs main spar spacing correctly Check wing alignment glue ribs between leading trailing edges glue has set remove lower wing assembly board Plank center section top bottom Add gussets wing tips Shape wing tips countersink ounce lead outboard tip Cut spruce N-strut mounting blocks shape Drill block 3/i-in-long 1/s-in-OD brass tubes Install tubes glue blocks between ribs flush top wing Note rear block oles aligned 27/s-in centers lower wing now structurally complete Drill mounting holes bellcrank Glue lower wing place making sure its right angles fuselage sighting top front Check correct positive incidence Temporarily install upper wing using nylon bolts center section struts make sure lower wing aligned upper viewed above Type Golden Age design adaptable both Navy Carrier Profile Scale events Wingspan 37 inches Recommended engine size type OS Max 40 Class Navy Carrier 36-size engine Profile Carrier 29- 45-size sport flying Expected flying weight 42 ounces Type construction Built-up wing sheet balsa fuselage tail surfaces Type covering/finish recommended Paint Covering choice silkspan silk nylon ironon film fabric December 1992 167 V /C 55 SEBEDE STUD SPED- IAILDEO~ToTLISE wing tips templates needed keep wings exactly parallel fit N-struts Loop rubberbands over wings templates maintain slight tension prevent shifting struts being fitted Cut four 3/s-in-wide upright struts /s-in Lite Ply trimming fit between strut mounting holes shown plan Cut /s-in-wide -in-deep slots ends strut glue piece 1/2-inlong /8-in-OD brass tubing slot Cut eight l-in-Iong pieces music wire make slip fit inside tubes Bend piece wire slightly middle holding strut place fit wire end struts proper mounting Wing struts center section struts simply two short pieces standard 5/8-in streamlined aluminum strut tubing readily available well-stocked hobby shop Cut struts length shown shape fit wing camber glued A2 ply pads bottom upper wing additional bearing struts upper wing should 00 incidence installed nylon bolts tightened incidence can adjusted either inserting shims slightly changing length struts N-struts easier build describe both wings installed cut pair matching cardboard templates fit between wings slide over Static Display Models FREE Model Airplane Building Lessons RADIO CONTROLLED CARS S PLANES COPTERS NS FOR SHOW INFORMATION PHONE 714723-6057 Fax 7147230913 SWAP SHOP call Red 209-931-0214 GIANT RAFFLE Advance Admission Tickets Available International Modeler Shows Inc Dept E 10127 Costa Mesa CA 92627 holes wings wings should flex enough permit operation wires floating freely tubes mounted struts wings will self-align have finished fitting four upright struts little patience care called recheck wing alignment cut fit 1/s-in Lite Ply diagonal struts glue place N-struts should fit perfectly Run thin variety Hot Stuff wire/tube joints strut secure wires Remove N-struts glue 1/32 ply facings side Overlap upright/ diagonal joint strength An alteruative method securing N-struts drill across end upright struts bolt screw eyes eye bolts mounting blocks method permits adjust incidence unless bent metal fitting added ends N-struts allow mounting scaleangledway its still easier install vertically upper wing N-strut mounting blocks would have moved rib section inboard vertical installation Landing gear Drill two 5A2 holes landing gear mount shown plan Install -in lengths 5h2-OD brass tubing holes Bend four pieces /32 music wire shape shown used K&S Engineering Mini Wire Bender Fit landing gear wires tubes mount nylon clamps wrap solder shown Install 1R-in Lite Ply filler wheel fairings open-faced Make -in -in balsa glued together /s-in ply insert trimmed shape Notch insides receive landing gear legs shown plan Epoxy fairings place cover notch made landing gear wires piece /16 ply cover should flush fit An alteruative shaped aluminum landing gear available $10 Tom Dixon PO Box 671166 Marietta GA 30066 order line 404 973-0004 sure order small profile gear shaped aluminum gear much simpler mount fuselage adding wheel fairings becomes complicated Bellcrank/book release Cut bend bellcrank mounts shape Drill mounts bellcrank fit bellcrank place Assemble bellcrank mount model check free operation Throttle bellcranks available LR Products Ltd 7787 Archdale Ave Detroit MI 48228 Order upright short-span type Notch fuselage hardwood block carries /s-in hook release pin Glue 1As ply plates fuselage drill hook bearing stop stop should limit hook 450 angle hook released Install bellcrank pushrod hook release mechanism after finishing model 168 Model Aviation us Pasadena mm ItsaS Admission $600 dren under 6 FREE adult Win RIC System 1st Trophies 2nd & 3rd Covering finishing Except chrome yellow top surface upper wing entire model silver Since struts separate upper wing yellow accent easy apply wings can covered silkspan tissue silk nylon iron-on plastic fabric Subsequent finishing operations will depend material chosen wont go details Add details such windshield paint cockpit black guns gunsight radio mast aileron stripes decorations complete upper wing has mounted put Loctite thin Hot Stuff wire/tube joints help hold struts place Flying For test-flying balance model shown plan up 1/2 ifl further forward Mount engine far forward possible best balance maximum tank space can experiment wing incidence balance point settings optimal performance under certain conditions slightly thicker fully symmetrical airfoils both wings Seahawk may show some modest stunt performance sport flying use 55- 70-ft control lines See ALMA Competition Regulations handbook recommendations control line wire diameters pull-testing etc Happy flying Address correspondence 1237 5 Grant St Tacoma WA 98405 ED GOOD AIRMEN Ltgflter PtbAn Baud da Bust Pilot KitMade USA #1081/8 scaIe.$695 #1061/6 scale #105-1/5 scale #1041/4 scale #103-1/3 scale.1595 #3081/8 jet695 #307 1/7 jet795 L V Lie tm FAX 315 5484099 Full Body Pilot Kit #206-1/6 scaIe.$ 995 #205-1/5 scale.1095 #204114 scale.1195 #203-1/3 scale.1795 Cotarns Pilot head hads Pools helmet cap goggles full templates altO easy Soo sImple ssmg teqoltee ORDERING INSTRIJOTIONS see year dealer first Ot oeder direct Add 5100 shipping RIPS Residents edd 7% lao Cheph 0 Mosey Orde THE AIRPLANE FACTORY INC 1880 PINE VIEW MANDEVILLE LA 70448 504-626-7840 FREE CATALOG R/C Combat Crash Resistant 48 wingspan 4A -5 lbs Aluminum lundiog Gene Video 4 P & H $295 LIST $8995 MC e COD 1 800 264 7840 Kombat 4Qtt member quick building exiremely durable Armadillo series Made aluminum polypropelyne no foam can assembled engine mounted radio installed hour Nothing extra buy provide 4 channel radio / 25-40 engine supply everything else great sports plane fully aerobatic bolt-on symmetrical wing pre-hinged pre-finished red biue orange yellow compared other aimost ready fly designs take 10-12 hours longer complete Kombat 40 true winner ORDER YOURS TODAVI Trainer Version available $7495 t Flying Flys hour SCRATCHBUILD 14 SCALE PLANS ae8u pilee CESSNA AG WAGON 1235 4 sssS34OO CESSNA U206TU206 lo75 5 osS87OC CESSNA 152 AEROBAT 99s 3 msS3SOO PIPER PAWNEEios 4 sanSS4OC TRANSA VIA AIRTRUK 1178 5 osS37OO EDO FLOATS[v32]Tsa 2 unSWSOC EDO AMPHIB FLOATS 61 3 sasSSSOC Add PSPsas$53-OO Snarfane ms856-OO Afransail FREE Degasmeastatjoas plasas Photographs available PHONE 032128192 VISA & MASTERCARD Welcome J SEND as3 go Eon COMPLETE LISPING uLL PLANS BOOKS eaaPeoDLCTs SEROICEs SENT FREE WIPe ALL ORDERS NEW ZEALAND AERO PRODUCTS 3d WAf U PABADE SPIRLINS POINT ELUPE NOW ZEALAND Conlrol Line Version Also Available Gail Today Dealer Inquiries Welcome