Kent E Thomas s.. S.. SS .. 5SSSSb SSSS S 55 SSS S 55 SSS S 5555S SSSS S 5555 S S S S55SSS 555 S S S SS 1LJ RON DOGE SSSSSSSS 55 S S S S SSSSS SS 555 SS S 555 SSSSSS SS SSS S 555555 .SS. S 5S SS SSS 55555 P55 S S S S 555SS S5 S 55S FOR THE P-39 Airacobra Iron Dog complimentary name such clean beautifully proportioned air plane sleek streamlined shape absence cheek cowls large airscoops makes good subject quarter-mid get racer full-scale plane raced great success just after WW II does qualify eligible design As quarter-midget racer has development about three years past 24 months has brought home trophies other quarter midget Southern California have something good going youre going smileKent Iron Dog Long nose results fact real ship amidships engine location extension shaft running under cockpit prop Start always choose lightest wood can find light airplane close 2 lhs possible desirable Strength has no problem use aliphatic resin glue five-minute epoxy construction except gluing wing sheeting together sheeting wing Zap Hot Stuff will speed up fuselage construction pressed time Fuselage Lay out cut identical right left sides 1/8 balsa Firmly mark LE TE formers firewall thrustline locations inside Glue /2 triangles /8 wing saddle doublers 1/s nose doublers drying cut out 3/16 balsa LE TE formers ood firewall Mark vertical centerline three also mark thrust line firewall usually mark front rear above Cut out LE former tank cradle epoxy 1/16 plywood doubler across bottom support wing dowels Tank cradle cut centerline tank w thrust line use 4-ounce slant Sullivan tank Using centerlines previ ously drawn firewall locate Tatone mount drill holes insert 6-32 blind nuts Mount Tatone mount 6-32 screws Bend /s music wire nose gear Drill firewall below Tatone mount J bolt nose gear firewall Top 1 picture better thousand wordsthe installation Note wing hold-down point Above Conventional aileron linkage aluminum shroud shields servo foul ups Decorative scheme individualistic stand out well air use steerable nose gear Take offs started full throttle rud der steering very positive creating over control plane usually ahead pack going #1 pylon after takeoff due superior ground handling though have go get plane after landing advantage offsets Draw centerline end end 3/16 X 3 balsa fuselage top both sides Pin top flat surface ac curately mark position firewall LE IE formers Epoxy LE TE formers top using L square accu rate alignment Lay out sides using Xacto saw make about four cuts through /2 triangle just behind IE 10 Model Aviation High point winner 1975 QMRC Southern California 22 trophies P-39 Airacobra better Quarter Midgets nation restricted Goodyear types Quarter Midget rules allow wide variety racing planes such P-39 Cobras flew post-war races Thanks engine location real ship very clean nose results model former position Cut through triangle s top bottom triangle Also make about six cuts just ahead LE former top bottom cuts allow fuselage sides bend around formers Epoxy sides together tail post being certain square will create twist fuselage sides glued top usually pinning sides TE former lining marks sides former pull rear together over centerline pin epoxy Now about ready put parts together Get out least large C clamp large enough use across width fuselage scrap pieces ply wood glue pins Before proceeding try fuselage sides proper fit align ment formers Using liberal amount glue thin water necessary glue pin fuselage sides top form ers Using C clamps padded scrap plywood pull sides ahead leading edge until pressing against firewall sides firewall coated glue pressed back against nose doublers sure no down- up-thrust built sighting down along Tatone mount aligning centerline top can assure no side-thrust being built sure centerline firewall aligned center line top everything lined up pin solid double check leave overnight dry Use aliphatic glue allows working time alignment Using care fuselage will come out straight true Well come back fuselage later Tail Cut out stabilizer fin rudder elevator 3/16 balsa Complete ele vator R L cut piece mark ing cutting out Vee center razor-plane sandpaper taper rudder elevator shape LE elevator cut 3/16 3 notch Epoxy 3/16 square hardwood notch epoxy has cured cut out Vee separate R L elevator assures alignment elevators Wing Cut core conventional manner no washout core cut thin great amount care necessary prevent warps twists ing built during skinning process core tip about /s thick al transparent say cant cut foam wings Buy Jack Stafford P-5 quarter-midget wing kit proceed follows First epoxy landing gear boards marked plan cut LE core balsa LE off TE balsa TE top part foam block secured flat table core pinned block epoxy 1/32 plywood tip Use wax paper plywood wont ad block epoxy has cured insert row pins next plywood pinning core tip block Angle-pin root core other pins will removed Core should exact spot cut block Using model cement glue 1/16 balsa sheeting together before skinning wing Using available adhe sives glue sheeting core Place other half block top section just sheeted weight down work other panel both panels sheeted side sheet bottom first re move block trim sheeting Nail other half block table pin core down before sheet second side Weight before Remove later trim Pin cores back blocks glue lead ing trailing edge balsa core using epoxy aliphatic glue glue dry remove cores blocks cut off 1/32 plywood tips trim tips end sheeting Match lengths R L panels trimming tips Reinstall templates used cutting cores mark center leading trailing edges both ends Use straightedge draw line root tip LE TE Get out trusty razor-plane rough shape using reference lines just drawn guide Starting look like wing isnt Finally glue tip block plane sand top bottom curve Cut rounded February 1977 11 Iron Dog tips knife sand tips final shape Now almost ready join wing halves Before cut slot top wing directly over landing gear block Cut slot down LG block ofasizetoacceptthe X ardwood joiner Also cut out servo opening Block up wing tip 1 epoxy wing together epoxy set epoxy joiner top wing Cut out aileron TE Steal wire clothes hanger wife cheapies made thinner wire about 080 thick Ys aluminum tubing clothes hanger wire make up aileron linkage fit application method making up linkage allows get custom linkage have FOAM WING TEMPLATES WING SET AT 0 INCIDENCE WINQ DOWELSBALAI 3/16 DIAII --i CTI TI _ zz ON RECESS FOR SERVO5CR AILERON SERVO1/4 z I/I6 BALSA SKINS OVER FOAM CORES~ BALSA WINOTIPS I/3ZPLY WINGAILERI BOTTOM SURFACE ITRAILING EDGE STOCKONLY LERON-CUT OUT OF WING TE AS SHOWNAILERON TOR UEROC FILL NOSE SECTION WITH BALSA BLOCKS AND SANDHANGERRUNNING IN TO SHAPE CUT OUT OPENING TO SUIT ENGINE &UP AS SHOWN TOROUI HOLLOW OUT TO RECEIVE ENGINE & MOUNT ICH ARE CARVED IP TE STOCK TO RECEIV lAG PLY LLED WITH MICRO-a IS ENGINE LINE THIS BAY WITHSMOOTH IIBSHEET BALSAVERTICAL GRAIN GOLDBERG-- ______ SPINNERN-II I-I/2D1A1% III NE LONG MOUNW___zt_________ I/4PLYI FIREWALL J-BOLTS I/B DIA MUSIC W1~ U AILERON TORQUE ROD TEMPLATE 7 NON-STEERABLE NOSE GEAR IPLY BALSA 3A6 BALSA THROTTLE SERVO RUDDER SERVO ELEVATOR SERVO SIG gWWH CANOPY 1I II II1RECEIJ1ik4I~iLj--------SWITCH ,I, TANKI E~j N SS-4II- ENGINE THRUST LINE SET AT OSIDE THRUST GDOWN THRUSTI/4I/211~I 3/I6BALSABALSA-I/2TRIANGLE STOCKI/8BALSA DOUBLER -IIi INDIA WILLIAMSI-V2DIAWILUANS BROTHERSBRO WHEELS WHEEL 12 Model Aviation w 0 w w n w -I -J U -J w N U -J -J L MAKE LEFT Li RIGHT use compromise size Slot bottom wing install linkage epoxy Inset epoxy 1/32 X 2 X 4 plywood bottom wing partially covering aileron linkage reinforcing rear wing hold down Fill remainder slot micro-balloons resin glass ADE FROM WIRE COAT BRASS TUBEAND BENT RE INSTALLED IN GOOVES DERSIDES OF ThE BALSA THE GROOVE IS ThEN & RESIN AND SANDED center section have never trouble result Leave off save weight main landing gear bent 3/32 music wire secured LG blocks wood screws two small wood screws per side WING LEADING EDGE 3/AI/2RALA NT VIEW OF WING CDdTER SECTION NTS WOOD3/32D1A MUSIC WIRE AILERON TRAVEL 3/l6UP 8 DOWN INSET AILEROI SNUGLY INTO TE 1 Fi 1---- ~-------iL-- RUDDER TRAVEL 3/4 EACH SIDE J 3A6DOWEL r 3/I6BALSA. 1 STABILIZER & ELEVATOR F1 & 1/16 PLY ROCKET CITY HINGES J 3/8 HARDWOODELEVATOI ALSA AIRSCOOP- .JTRAVEL 3/SUP& lit TRIANGLE STOCWL iTI1jli8BALSASIDES --6-32 TEE NUT3/32 BALSA SHEET 6-32BOLT1011123466 iUCSON WINTER NATS LE VESTAST CHAMRCHULA VISTA KENT YMOMAU UARTUH MIOUUT INT WINNER1975QMRC CLUB EXICALI MEXICO EASTER RACE9 Al RACOBRA INKED FOR MODEL AVIATION BY ' / BALSA FIN &RUDOER Back fuselage Remove weird looking thing table Ahead firewall glue doublers inside nose top bottom sides dry cut out right side bolt engine Cover en gine Saran Wrap cut nose length install prop spinner marking around outside spinner get reference line Remove prop spinner razor-plane cut nose down reference mark Cut out 1/16 1/32 plywood fit between spinner nose fuselage Epoxy plywood nose sure allow clearance between spinner plywood Remove engine ready make thing look like fuselage Razorplane desired shape feel need templates use eyeball Glue stab fin Line up fin centerline drew fuselage top Epoxy 3/16 dowels wing leading edge Mark drill holes LE former see 1/16 plywood doubler Check incidence very carefully Wing stab should both zero degrees happy incidence epoxy Y4 plywood rear wing holddown 6-32 blind nut installed prior installing plane Drill hole wing TE line blind nut accept 6-32 bolt Epoxy hardwood servo mount ing boards fuselage sides also strengthen fuselage Epoxy 3/16 balsa across fuselage front servo mounting boards Epoxy 1/32 plywood switch mount top 3/16 balsa just installed Temporarily install elevator rudder throttle servos across fuselage fasten ing mounting boards Mark positions install Nyrod shown elevator rudder pull wires youre install plastic tubing cable 1/32 music wire throttle control Remove servos glue 3/32 balsa bottom rear fuselage Also glue 3/16 balsa bottom front fuselage close front Install wing razor-plane sand lower fuselage shape Remove wing youre ready final sanding finish ing Hinge control surfaces usual manner bearing mind fine minimum clearance gap desirable Finishing Use own method consideration fuse lage fin rudder fill dings poly ester resin micro-balloons use K&B Francis good brand okay After sanding out micro-balloons wipe two coats polyester resin sand ing first coat about 180 grit paper second coat about 220 grit care ful about sanding through bare balsa Spray lacquer primer dry sand off 220-grit paper primer fills pin holes other imperfec tions noticed before Use tack rag clean off dust spray K&B Su per Poxy just enough get good color wings stab use plas February 1977 13 1i tic films because quick light also use plastic trim sheets easy trim ming plane camel-hair brush coat edges film clear urethane var nish prevent fuel creeping under edges done Canopy Used 9 Sig WW II Final height fuselage including canopy should 5 Since canopy must cut down fit fuselage cut down sufficiently bring final height fuselage including canopy minimum 5 Using strips sticky Monokote glue windshield canopy brace lines inside canopy Canopy can glued down epoxy Zap Below Tail surfaces fuselages sides topInstall Radio Adjust aileron throw firewall ready assembly Motor mount3/16 up 3/16 down Elevator throw nose-gear strut mount shown ply-to /8 up /8 down Rudder throw od Powerful rudder avoids steerable strutand t CG shown plan Allup weight should very close 2 lbs build light may have add weight reach 2 lbs minimum Moment truth Radio range checked surfaces neutral engine idles youre ready Takeoff will require little right rudder offset torque Ground accelera tion fast speed reached slight up elevator flies ship flies easily tracks true has no bad flight characteristics opinion rac ing plane should fly way can concentrate pylon polishing trimmed should take very little Try few power stalls just learn plane might react landingnice no snap just drops nose Above Here completed sides attached fuselage top formers pull sides firewall author uses big CClamps padded pieces plywood Right The nose has blocked top fuselage rounded well use razorplane Bottom sheeting completed photo order show Nyrods rudder elevator pull wires 14 Model Aviation Iron Dog Left Wing panel after sheeting Important plywood tip hold camber dur ing sheetingthe foam core thin Right For accurate shaping leading trail ing edges metal straight edge lined up wing template attached wing root Below The two completed wing panels ready join center Note cut outs servo wing brace wing joiner installed after panels joined epoxy has set Right Landing gear wire secured blocks wood screws Wide 1/32 ply trailing edge reinforces wing hold-down Designer does glass center sectionsays save weight Ready land Plane glides flat fast get just off ground start easing just enough elevator bleed off excess speed allow slight nosehigh landing Touch-down can quite slow no danger snap rolling CG set up correctly have youre ready race plane Iron Dog allHot Dog like Go out bring home trophies Above Bottom view wing aileron hardware already place Note wing position dowls align against bottom leading edge February 1977 15
Edition: Model Aviation - 1977/02
Page Numbers: 10, 11, 12, 13, 14, 15
Kent E Thomas s.. S.. SS .. 5SSSSb SSSS S 55 SSS S 55 SSS S 5555S SSSS S 5555 S S S S55SSS 555 S S S SS 1LJ RON DOGE SSSSSSSS 55 S S S S SSSSS SS 555 SS S 555 SSSSSS SS SSS S 555555 .SS. S 5S SS SSS 55555 P55 S S S S 555SS S5 S 55S FOR THE P-39 Airacobra Iron Dog complimentary name such clean beautifully proportioned air plane sleek streamlined shape absence cheek cowls large airscoops makes good subject quarter-mid get racer full-scale plane raced great success just after WW II does qualify eligible design As quarter-midget racer has development about three years past 24 months has brought home trophies other quarter midget Southern California have something good going youre going smileKent Iron Dog Long nose results fact real ship amidships engine location extension shaft running under cockpit prop Start always choose lightest wood can find light airplane close 2 lhs possible desirable Strength has no problem use aliphatic resin glue five-minute epoxy construction except gluing wing sheeting together sheeting wing Zap Hot Stuff will speed up fuselage construction pressed time Fuselage Lay out cut identical right left sides 1/8 balsa Firmly mark LE TE formers firewall thrustline locations inside Glue /2 triangles /8 wing saddle doublers 1/s nose doublers drying cut out 3/16 balsa LE TE formers ood firewall Mark vertical centerline three also mark thrust line firewall usually mark front rear above Cut out LE former tank cradle epoxy 1/16 plywood doubler across bottom support wing dowels Tank cradle cut centerline tank w thrust line use 4-ounce slant Sullivan tank Using centerlines previ ously drawn firewall locate Tatone mount drill holes insert 6-32 blind nuts Mount Tatone mount 6-32 screws Bend /s music wire nose gear Drill firewall below Tatone mount J bolt nose gear firewall Top 1 picture better thousand wordsthe installation Note wing hold-down point Above Conventional aileron linkage aluminum shroud shields servo foul ups Decorative scheme individualistic stand out well air use steerable nose gear Take offs started full throttle rud der steering very positive creating over control plane usually ahead pack going #1 pylon after takeoff due superior ground handling though have go get plane after landing advantage offsets Draw centerline end end 3/16 X 3 balsa fuselage top both sides Pin top flat surface ac curately mark position firewall LE IE formers Epoxy LE TE formers top using L square accu rate alignment Lay out sides using Xacto saw make about four cuts through /2 triangle just behind IE 10 Model Aviation High point winner 1975 QMRC Southern California 22 trophies P-39 Airacobra better Quarter Midgets nation restricted Goodyear types Quarter Midget rules allow wide variety racing planes such P-39 Cobras flew post-war races Thanks engine location real ship very clean nose results model former position Cut through triangle s top bottom triangle Also make about six cuts just ahead LE former top bottom cuts allow fuselage sides bend around formers Epoxy sides together tail post being certain square will create twist fuselage sides glued top usually pinning sides TE former lining marks sides former pull rear together over centerline pin epoxy Now about ready put parts together Get out least large C clamp large enough use across width fuselage scrap pieces ply wood glue pins Before proceeding try fuselage sides proper fit align ment formers Using liberal amount glue thin water necessary glue pin fuselage sides top form ers Using C clamps padded scrap plywood pull sides ahead leading edge until pressing against firewall sides firewall coated glue pressed back against nose doublers sure no down- up-thrust built sighting down along Tatone mount aligning centerline top can assure no side-thrust being built sure centerline firewall aligned center line top everything lined up pin solid double check leave overnight dry Use aliphatic glue allows working time alignment Using care fuselage will come out straight true Well come back fuselage later Tail Cut out stabilizer fin rudder elevator 3/16 balsa Complete ele vator R L cut piece mark ing cutting out Vee center razor-plane sandpaper taper rudder elevator shape LE elevator cut 3/16 3 notch Epoxy 3/16 square hardwood notch epoxy has cured cut out Vee separate R L elevator assures alignment elevators Wing Cut core conventional manner no washout core cut thin great amount care necessary prevent warps twists ing built during skinning process core tip about /s thick al transparent say cant cut foam wings Buy Jack Stafford P-5 quarter-midget wing kit proceed follows First epoxy landing gear boards marked plan cut LE core balsa LE off TE balsa TE top part foam block secured flat table core pinned block epoxy 1/32 plywood tip Use wax paper plywood wont ad block epoxy has cured insert row pins next plywood pinning core tip block Angle-pin root core other pins will removed Core should exact spot cut block Using model cement glue 1/16 balsa sheeting together before skinning wing Using available adhe sives glue sheeting core Place other half block top section just sheeted weight down work other panel both panels sheeted side sheet bottom first re move block trim sheeting Nail other half block table pin core down before sheet second side Weight before Remove later trim Pin cores back blocks glue lead ing trailing edge balsa core using epoxy aliphatic glue glue dry remove cores blocks cut off 1/32 plywood tips trim tips end sheeting Match lengths R L panels trimming tips Reinstall templates used cutting cores mark center leading trailing edges both ends Use straightedge draw line root tip LE TE Get out trusty razor-plane rough shape using reference lines just drawn guide Starting look like wing isnt Finally glue tip block plane sand top bottom curve Cut rounded February 1977 11 Iron Dog tips knife sand tips final shape Now almost ready join wing halves Before cut slot top wing directly over landing gear block Cut slot down LG block ofasizetoacceptthe X ardwood joiner Also cut out servo opening Block up wing tip 1 epoxy wing together epoxy set epoxy joiner top wing Cut out aileron TE Steal wire clothes hanger wife cheapies made thinner wire about 080 thick Ys aluminum tubing clothes hanger wire make up aileron linkage fit application method making up linkage allows get custom linkage have FOAM WING TEMPLATES WING SET AT 0 INCIDENCE WINQ DOWELSBALAI 3/16 DIAII --i CTI TI _ zz ON RECESS FOR SERVO5CR AILERON SERVO1/4 z I/I6 BALSA SKINS OVER FOAM CORES~ BALSA WINOTIPS I/3ZPLY WINGAILERI BOTTOM SURFACE ITRAILING EDGE STOCKONLY LERON-CUT OUT OF WING TE AS SHOWNAILERON TOR UEROC FILL NOSE SECTION WITH BALSA BLOCKS AND SANDHANGERRUNNING IN TO SHAPE CUT OUT OPENING TO SUIT ENGINE &UP AS SHOWN TOROUI HOLLOW OUT TO RECEIVE ENGINE & MOUNT ICH ARE CARVED IP TE STOCK TO RECEIV lAG PLY LLED WITH MICRO-a IS ENGINE LINE THIS BAY WITHSMOOTH IIBSHEET BALSAVERTICAL GRAIN GOLDBERG-- ______ SPINNERN-II I-I/2D1A1% III NE LONG MOUNW___zt_________ I/4PLYI FIREWALL J-BOLTS I/B DIA MUSIC W1~ U AILERON TORQUE ROD TEMPLATE 7 NON-STEERABLE NOSE GEAR IPLY BALSA 3A6 BALSA THROTTLE SERVO RUDDER SERVO ELEVATOR SERVO SIG gWWH CANOPY 1I II II1RECEIJ1ik4I~iLj--------SWITCH ,I, TANKI E~j N SS-4II- ENGINE THRUST LINE SET AT OSIDE THRUST GDOWN THRUSTI/4I/211~I 3/I6BALSABALSA-I/2TRIANGLE STOCKI/8BALSA DOUBLER -IIi INDIA WILLIAMSI-V2DIAWILUANS BROTHERSBRO WHEELS WHEEL 12 Model Aviation w 0 w w n w -I -J U -J w N U -J -J L MAKE LEFT Li RIGHT use compromise size Slot bottom wing install linkage epoxy Inset epoxy 1/32 X 2 X 4 plywood bottom wing partially covering aileron linkage reinforcing rear wing hold down Fill remainder slot micro-balloons resin glass ADE FROM WIRE COAT BRASS TUBEAND BENT RE INSTALLED IN GOOVES DERSIDES OF ThE BALSA THE GROOVE IS ThEN & RESIN AND SANDED center section have never trouble result Leave off save weight main landing gear bent 3/32 music wire secured LG blocks wood screws two small wood screws per side WING LEADING EDGE 3/AI/2RALA NT VIEW OF WING CDdTER SECTION NTS WOOD3/32D1A MUSIC WIRE AILERON TRAVEL 3/l6UP 8 DOWN INSET AILEROI SNUGLY INTO TE 1 Fi 1---- ~-------iL-- RUDDER TRAVEL 3/4 EACH SIDE J 3A6DOWEL r 3/I6BALSA. 1 STABILIZER & ELEVATOR F1 & 1/16 PLY ROCKET CITY HINGES J 3/8 HARDWOODELEVATOI ALSA AIRSCOOP- .JTRAVEL 3/SUP& lit TRIANGLE STOCWL iTI1jli8BALSASIDES --6-32 TEE NUT3/32 BALSA SHEET 6-32BOLT1011123466 iUCSON WINTER NATS LE VESTAST CHAMRCHULA VISTA KENT YMOMAU UARTUH MIOUUT INT WINNER1975QMRC CLUB EXICALI MEXICO EASTER RACE9 Al RACOBRA INKED FOR MODEL AVIATION BY ' / BALSA FIN &RUDOER Back fuselage Remove weird looking thing table Ahead firewall glue doublers inside nose top bottom sides dry cut out right side bolt engine Cover en gine Saran Wrap cut nose length install prop spinner marking around outside spinner get reference line Remove prop spinner razor-plane cut nose down reference mark Cut out 1/16 1/32 plywood fit between spinner nose fuselage Epoxy plywood nose sure allow clearance between spinner plywood Remove engine ready make thing look like fuselage Razorplane desired shape feel need templates use eyeball Glue stab fin Line up fin centerline drew fuselage top Epoxy 3/16 dowels wing leading edge Mark drill holes LE former see 1/16 plywood doubler Check incidence very carefully Wing stab should both zero degrees happy incidence epoxy Y4 plywood rear wing holddown 6-32 blind nut installed prior installing plane Drill hole wing TE line blind nut accept 6-32 bolt Epoxy hardwood servo mount ing boards fuselage sides also strengthen fuselage Epoxy 3/16 balsa across fuselage front servo mounting boards Epoxy 1/32 plywood switch mount top 3/16 balsa just installed Temporarily install elevator rudder throttle servos across fuselage fasten ing mounting boards Mark positions install Nyrod shown elevator rudder pull wires youre install plastic tubing cable 1/32 music wire throttle control Remove servos glue 3/32 balsa bottom rear fuselage Also glue 3/16 balsa bottom front fuselage close front Install wing razor-plane sand lower fuselage shape Remove wing youre ready final sanding finish ing Hinge control surfaces usual manner bearing mind fine minimum clearance gap desirable Finishing Use own method consideration fuse lage fin rudder fill dings poly ester resin micro-balloons use K&B Francis good brand okay After sanding out micro-balloons wipe two coats polyester resin sand ing first coat about 180 grit paper second coat about 220 grit care ful about sanding through bare balsa Spray lacquer primer dry sand off 220-grit paper primer fills pin holes other imperfec tions noticed before Use tack rag clean off dust spray K&B Su per Poxy just enough get good color wings stab use plas February 1977 13 1i tic films because quick light also use plastic trim sheets easy trim ming plane camel-hair brush coat edges film clear urethane var nish prevent fuel creeping under edges done Canopy Used 9 Sig WW II Final height fuselage including canopy should 5 Since canopy must cut down fit fuselage cut down sufficiently bring final height fuselage including canopy minimum 5 Using strips sticky Monokote glue windshield canopy brace lines inside canopy Canopy can glued down epoxy Zap Below Tail surfaces fuselages sides topInstall Radio Adjust aileron throw firewall ready assembly Motor mount3/16 up 3/16 down Elevator throw nose-gear strut mount shown ply-to /8 up /8 down Rudder throw od Powerful rudder avoids steerable strutand t CG shown plan Allup weight should very close 2 lbs build light may have add weight reach 2 lbs minimum Moment truth Radio range checked surfaces neutral engine idles youre ready Takeoff will require little right rudder offset torque Ground accelera tion fast speed reached slight up elevator flies ship flies easily tracks true has no bad flight characteristics opinion rac ing plane should fly way can concentrate pylon polishing trimmed should take very little Try few power stalls just learn plane might react landingnice no snap just drops nose Above Here completed sides attached fuselage top formers pull sides firewall author uses big CClamps padded pieces plywood Right The nose has blocked top fuselage rounded well use razorplane Bottom sheeting completed photo order show Nyrods rudder elevator pull wires 14 Model Aviation Iron Dog Left Wing panel after sheeting Important plywood tip hold camber dur ing sheetingthe foam core thin Right For accurate shaping leading trail ing edges metal straight edge lined up wing template attached wing root Below The two completed wing panels ready join center Note cut outs servo wing brace wing joiner installed after panels joined epoxy has set Right Landing gear wire secured blocks wood screws Wide 1/32 ply trailing edge reinforces wing hold-down Designer does glass center sectionsays save weight Ready land Plane glides flat fast get just off ground start easing just enough elevator bleed off excess speed allow slight nosehigh landing Touch-down can quite slow no danger snap rolling CG set up correctly have youre ready race plane Iron Dog allHot Dog like Go out bring home trophies Above Bottom view wing aileron hardware already place Note wing position dowls align against bottom leading edge February 1977 15
Edition: Model Aviation - 1977/02
Page Numbers: 10, 11, 12, 13, 14, 15
Kent E Thomas s.. S.. SS .. 5SSSSb SSSS S 55 SSS S 55 SSS S 5555S SSSS S 5555 S S S S55SSS 555 S S S SS 1LJ RON DOGE SSSSSSSS 55 S S S S SSSSS SS 555 SS S 555 SSSSSS SS SSS S 555555 .SS. S 5S SS SSS 55555 P55 S S S S 555SS S5 S 55S FOR THE P-39 Airacobra Iron Dog complimentary name such clean beautifully proportioned air plane sleek streamlined shape absence cheek cowls large airscoops makes good subject quarter-mid get racer full-scale plane raced great success just after WW II does qualify eligible design As quarter-midget racer has development about three years past 24 months has brought home trophies other quarter midget Southern California have something good going youre going smileKent Iron Dog Long nose results fact real ship amidships engine location extension shaft running under cockpit prop Start always choose lightest wood can find light airplane close 2 lhs possible desirable Strength has no problem use aliphatic resin glue five-minute epoxy construction except gluing wing sheeting together sheeting wing Zap Hot Stuff will speed up fuselage construction pressed time Fuselage Lay out cut identical right left sides 1/8 balsa Firmly mark LE TE formers firewall thrustline locations inside Glue /2 triangles /8 wing saddle doublers 1/s nose doublers drying cut out 3/16 balsa LE TE formers ood firewall Mark vertical centerline three also mark thrust line firewall usually mark front rear above Cut out LE former tank cradle epoxy 1/16 plywood doubler across bottom support wing dowels Tank cradle cut centerline tank w thrust line use 4-ounce slant Sullivan tank Using centerlines previ ously drawn firewall locate Tatone mount drill holes insert 6-32 blind nuts Mount Tatone mount 6-32 screws Bend /s music wire nose gear Drill firewall below Tatone mount J bolt nose gear firewall Top 1 picture better thousand wordsthe installation Note wing hold-down point Above Conventional aileron linkage aluminum shroud shields servo foul ups Decorative scheme individualistic stand out well air use steerable nose gear Take offs started full throttle rud der steering very positive creating over control plane usually ahead pack going #1 pylon after takeoff due superior ground handling though have go get plane after landing advantage offsets Draw centerline end end 3/16 X 3 balsa fuselage top both sides Pin top flat surface ac curately mark position firewall LE IE formers Epoxy LE TE formers top using L square accu rate alignment Lay out sides using Xacto saw make about four cuts through /2 triangle just behind IE 10 Model Aviation High point winner 1975 QMRC Southern California 22 trophies P-39 Airacobra better Quarter Midgets nation restricted Goodyear types Quarter Midget rules allow wide variety racing planes such P-39 Cobras flew post-war races Thanks engine location real ship very clean nose results model former position Cut through triangle s top bottom triangle Also make about six cuts just ahead LE former top bottom cuts allow fuselage sides bend around formers Epoxy sides together tail post being certain square will create twist fuselage sides glued top usually pinning sides TE former lining marks sides former pull rear together over centerline pin epoxy Now about ready put parts together Get out least large C clamp large enough use across width fuselage scrap pieces ply wood glue pins Before proceeding try fuselage sides proper fit align ment formers Using liberal amount glue thin water necessary glue pin fuselage sides top form ers Using C clamps padded scrap plywood pull sides ahead leading edge until pressing against firewall sides firewall coated glue pressed back against nose doublers sure no down- up-thrust built sighting down along Tatone mount aligning centerline top can assure no side-thrust being built sure centerline firewall aligned center line top everything lined up pin solid double check leave overnight dry Use aliphatic glue allows working time alignment Using care fuselage will come out straight true Well come back fuselage later Tail Cut out stabilizer fin rudder elevator 3/16 balsa Complete ele vator R L cut piece mark ing cutting out Vee center razor-plane sandpaper taper rudder elevator shape LE elevator cut 3/16 3 notch Epoxy 3/16 square hardwood notch epoxy has cured cut out Vee separate R L elevator assures alignment elevators Wing Cut core conventional manner no washout core cut thin great amount care necessary prevent warps twists ing built during skinning process core tip about /s thick al transparent say cant cut foam wings Buy Jack Stafford P-5 quarter-midget wing kit proceed follows First epoxy landing gear boards marked plan cut LE core balsa LE off TE balsa TE top part foam block secured flat table core pinned block epoxy 1/32 plywood tip Use wax paper plywood wont ad block epoxy has cured insert row pins next plywood pinning core tip block Angle-pin root core other pins will removed Core should exact spot cut block Using model cement glue 1/16 balsa sheeting together before skinning wing Using available adhe sives glue sheeting core Place other half block top section just sheeted weight down work other panel both panels sheeted side sheet bottom first re move block trim sheeting Nail other half block table pin core down before sheet second side Weight before Remove later trim Pin cores back blocks glue lead ing trailing edge balsa core using epoxy aliphatic glue glue dry remove cores blocks cut off 1/32 plywood tips trim tips end sheeting Match lengths R L panels trimming tips Reinstall templates used cutting cores mark center leading trailing edges both ends Use straightedge draw line root tip LE TE Get out trusty razor-plane rough shape using reference lines just drawn guide Starting look like wing isnt Finally glue tip block plane sand top bottom curve Cut rounded February 1977 11 Iron Dog tips knife sand tips final shape Now almost ready join wing halves Before cut slot top wing directly over landing gear block Cut slot down LG block ofasizetoacceptthe X ardwood joiner Also cut out servo opening Block up wing tip 1 epoxy wing together epoxy set epoxy joiner top wing Cut out aileron TE Steal wire clothes hanger wife cheapies made thinner wire about 080 thick Ys aluminum tubing clothes hanger wire make up aileron linkage fit application method making up linkage allows get custom linkage have FOAM WING TEMPLATES WING SET AT 0 INCIDENCE WINQ DOWELSBALAI 3/16 DIAII --i CTI TI _ zz ON RECESS FOR SERVO5CR AILERON SERVO1/4 z I/I6 BALSA SKINS OVER FOAM CORES~ BALSA WINOTIPS I/3ZPLY WINGAILERI BOTTOM SURFACE ITRAILING EDGE STOCKONLY LERON-CUT OUT OF WING TE AS SHOWNAILERON TOR UEROC FILL NOSE SECTION WITH BALSA BLOCKS AND SANDHANGERRUNNING IN TO SHAPE CUT OUT OPENING TO SUIT ENGINE &UP AS SHOWN TOROUI HOLLOW OUT TO RECEIVE ENGINE & MOUNT ICH ARE CARVED IP TE STOCK TO RECEIV lAG PLY LLED WITH MICRO-a IS ENGINE LINE THIS BAY WITHSMOOTH IIBSHEET BALSAVERTICAL GRAIN GOLDBERG-- ______ SPINNERN-II I-I/2D1A1% III NE LONG MOUNW___zt_________ I/4PLYI FIREWALL J-BOLTS I/B DIA MUSIC W1~ U AILERON TORQUE ROD TEMPLATE 7 NON-STEERABLE NOSE GEAR IPLY BALSA 3A6 BALSA THROTTLE SERVO RUDDER SERVO ELEVATOR SERVO SIG gWWH CANOPY 1I II II1RECEIJ1ik4I~iLj--------SWITCH ,I, TANKI E~j N SS-4II- ENGINE THRUST LINE SET AT OSIDE THRUST GDOWN THRUSTI/4I/211~I 3/I6BALSABALSA-I/2TRIANGLE STOCKI/8BALSA DOUBLER -IIi INDIA WILLIAMSI-V2DIAWILUANS BROTHERSBRO WHEELS WHEEL 12 Model Aviation w 0 w w n w -I -J U -J w N U -J -J L MAKE LEFT Li RIGHT use compromise size Slot bottom wing install linkage epoxy Inset epoxy 1/32 X 2 X 4 plywood bottom wing partially covering aileron linkage reinforcing rear wing hold down Fill remainder slot micro-balloons resin glass ADE FROM WIRE COAT BRASS TUBEAND BENT RE INSTALLED IN GOOVES DERSIDES OF ThE BALSA THE GROOVE IS ThEN & RESIN AND SANDED center section have never trouble result Leave off save weight main landing gear bent 3/32 music wire secured LG blocks wood screws two small wood screws per side WING LEADING EDGE 3/AI/2RALA NT VIEW OF WING CDdTER SECTION NTS WOOD3/32D1A MUSIC WIRE AILERON TRAVEL 3/l6UP 8 DOWN INSET AILEROI SNUGLY INTO TE 1 Fi 1---- ~-------iL-- RUDDER TRAVEL 3/4 EACH SIDE J 3A6DOWEL r 3/I6BALSA. 1 STABILIZER & ELEVATOR F1 & 1/16 PLY ROCKET CITY HINGES J 3/8 HARDWOODELEVATOI ALSA AIRSCOOP- .JTRAVEL 3/SUP& lit TRIANGLE STOCWL iTI1jli8BALSASIDES --6-32 TEE NUT3/32 BALSA SHEET 6-32BOLT1011123466 iUCSON WINTER NATS LE VESTAST CHAMRCHULA VISTA KENT YMOMAU UARTUH MIOUUT INT WINNER1975QMRC CLUB EXICALI MEXICO EASTER RACE9 Al RACOBRA INKED FOR MODEL AVIATION BY ' / BALSA FIN &RUDOER Back fuselage Remove weird looking thing table Ahead firewall glue doublers inside nose top bottom sides dry cut out right side bolt engine Cover en gine Saran Wrap cut nose length install prop spinner marking around outside spinner get reference line Remove prop spinner razor-plane cut nose down reference mark Cut out 1/16 1/32 plywood fit between spinner nose fuselage Epoxy plywood nose sure allow clearance between spinner plywood Remove engine ready make thing look like fuselage Razorplane desired shape feel need templates use eyeball Glue stab fin Line up fin centerline drew fuselage top Epoxy 3/16 dowels wing leading edge Mark drill holes LE former see 1/16 plywood doubler Check incidence very carefully Wing stab should both zero degrees happy incidence epoxy Y4 plywood rear wing holddown 6-32 blind nut installed prior installing plane Drill hole wing TE line blind nut accept 6-32 bolt Epoxy hardwood servo mount ing boards fuselage sides also strengthen fuselage Epoxy 3/16 balsa across fuselage front servo mounting boards Epoxy 1/32 plywood switch mount top 3/16 balsa just installed Temporarily install elevator rudder throttle servos across fuselage fasten ing mounting boards Mark positions install Nyrod shown elevator rudder pull wires youre install plastic tubing cable 1/32 music wire throttle control Remove servos glue 3/32 balsa bottom rear fuselage Also glue 3/16 balsa bottom front fuselage close front Install wing razor-plane sand lower fuselage shape Remove wing youre ready final sanding finish ing Hinge control surfaces usual manner bearing mind fine minimum clearance gap desirable Finishing Use own method consideration fuse lage fin rudder fill dings poly ester resin micro-balloons use K&B Francis good brand okay After sanding out micro-balloons wipe two coats polyester resin sand ing first coat about 180 grit paper second coat about 220 grit care ful about sanding through bare balsa Spray lacquer primer dry sand off 220-grit paper primer fills pin holes other imperfec tions noticed before Use tack rag clean off dust spray K&B Su per Poxy just enough get good color wings stab use plas February 1977 13 1i tic films because quick light also use plastic trim sheets easy trim ming plane camel-hair brush coat edges film clear urethane var nish prevent fuel creeping under edges done Canopy Used 9 Sig WW II Final height fuselage including canopy should 5 Since canopy must cut down fit fuselage cut down sufficiently bring final height fuselage including canopy minimum 5 Using strips sticky Monokote glue windshield canopy brace lines inside canopy Canopy can glued down epoxy Zap Below Tail surfaces fuselages sides topInstall Radio Adjust aileron throw firewall ready assembly Motor mount3/16 up 3/16 down Elevator throw nose-gear strut mount shown ply-to /8 up /8 down Rudder throw od Powerful rudder avoids steerable strutand t CG shown plan Allup weight should very close 2 lbs build light may have add weight reach 2 lbs minimum Moment truth Radio range checked surfaces neutral engine idles youre ready Takeoff will require little right rudder offset torque Ground accelera tion fast speed reached slight up elevator flies ship flies easily tracks true has no bad flight characteristics opinion rac ing plane should fly way can concentrate pylon polishing trimmed should take very little Try few power stalls just learn plane might react landingnice no snap just drops nose Above Here completed sides attached fuselage top formers pull sides firewall author uses big CClamps padded pieces plywood Right The nose has blocked top fuselage rounded well use razorplane Bottom sheeting completed photo order show Nyrods rudder elevator pull wires 14 Model Aviation Iron Dog Left Wing panel after sheeting Important plywood tip hold camber dur ing sheetingthe foam core thin Right For accurate shaping leading trail ing edges metal straight edge lined up wing template attached wing root Below The two completed wing panels ready join center Note cut outs servo wing brace wing joiner installed after panels joined epoxy has set Right Landing gear wire secured blocks wood screws Wide 1/32 ply trailing edge reinforces wing hold-down Designer does glass center sectionsays save weight Ready land Plane glides flat fast get just off ground start easing just enough elevator bleed off excess speed allow slight nosehigh landing Touch-down can quite slow no danger snap rolling CG set up correctly have youre ready race plane Iron Dog allHot Dog like Go out bring home trophies Above Bottom view wing aileron hardware already place Note wing position dowls align against bottom leading edge February 1977 15
Edition: Model Aviation - 1977/02
Page Numbers: 10, 11, 12, 13, 14, 15
Kent E Thomas s.. S.. SS .. 5SSSSb SSSS S 55 SSS S 55 SSS S 5555S SSSS S 5555 S S S S55SSS 555 S S S SS 1LJ RON DOGE SSSSSSSS 55 S S S S SSSSS SS 555 SS S 555 SSSSSS SS SSS S 555555 .SS. S 5S SS SSS 55555 P55 S S S S 555SS S5 S 55S FOR THE P-39 Airacobra Iron Dog complimentary name such clean beautifully proportioned air plane sleek streamlined shape absence cheek cowls large airscoops makes good subject quarter-mid get racer full-scale plane raced great success just after WW II does qualify eligible design As quarter-midget racer has development about three years past 24 months has brought home trophies other quarter midget Southern California have something good going youre going smileKent Iron Dog Long nose results fact real ship amidships engine location extension shaft running under cockpit prop Start always choose lightest wood can find light airplane close 2 lhs possible desirable Strength has no problem use aliphatic resin glue five-minute epoxy construction except gluing wing sheeting together sheeting wing Zap Hot Stuff will speed up fuselage construction pressed time Fuselage Lay out cut identical right left sides 1/8 balsa Firmly mark LE TE formers firewall thrustline locations inside Glue /2 triangles /8 wing saddle doublers 1/s nose doublers drying cut out 3/16 balsa LE TE formers ood firewall Mark vertical centerline three also mark thrust line firewall usually mark front rear above Cut out LE former tank cradle epoxy 1/16 plywood doubler across bottom support wing dowels Tank cradle cut centerline tank w thrust line use 4-ounce slant Sullivan tank Using centerlines previ ously drawn firewall locate Tatone mount drill holes insert 6-32 blind nuts Mount Tatone mount 6-32 screws Bend /s music wire nose gear Drill firewall below Tatone mount J bolt nose gear firewall Top 1 picture better thousand wordsthe installation Note wing hold-down point Above Conventional aileron linkage aluminum shroud shields servo foul ups Decorative scheme individualistic stand out well air use steerable nose gear Take offs started full throttle rud der steering very positive creating over control plane usually ahead pack going #1 pylon after takeoff due superior ground handling though have go get plane after landing advantage offsets Draw centerline end end 3/16 X 3 balsa fuselage top both sides Pin top flat surface ac curately mark position firewall LE IE formers Epoxy LE TE formers top using L square accu rate alignment Lay out sides using Xacto saw make about four cuts through /2 triangle just behind IE 10 Model Aviation High point winner 1975 QMRC Southern California 22 trophies P-39 Airacobra better Quarter Midgets nation restricted Goodyear types Quarter Midget rules allow wide variety racing planes such P-39 Cobras flew post-war races Thanks engine location real ship very clean nose results model former position Cut through triangle s top bottom triangle Also make about six cuts just ahead LE former top bottom cuts allow fuselage sides bend around formers Epoxy sides together tail post being certain square will create twist fuselage sides glued top usually pinning sides TE former lining marks sides former pull rear together over centerline pin epoxy Now about ready put parts together Get out least large C clamp large enough use across width fuselage scrap pieces ply wood glue pins Before proceeding try fuselage sides proper fit align ment formers Using liberal amount glue thin water necessary glue pin fuselage sides top form ers Using C clamps padded scrap plywood pull sides ahead leading edge until pressing against firewall sides firewall coated glue pressed back against nose doublers sure no down- up-thrust built sighting down along Tatone mount aligning centerline top can assure no side-thrust being built sure centerline firewall aligned center line top everything lined up pin solid double check leave overnight dry Use aliphatic glue allows working time alignment Using care fuselage will come out straight true Well come back fuselage later Tail Cut out stabilizer fin rudder elevator 3/16 balsa Complete ele vator R L cut piece mark ing cutting out Vee center razor-plane sandpaper taper rudder elevator shape LE elevator cut 3/16 3 notch Epoxy 3/16 square hardwood notch epoxy has cured cut out Vee separate R L elevator assures alignment elevators Wing Cut core conventional manner no washout core cut thin great amount care necessary prevent warps twists ing built during skinning process core tip about /s thick al transparent say cant cut foam wings Buy Jack Stafford P-5 quarter-midget wing kit proceed follows First epoxy landing gear boards marked plan cut LE core balsa LE off TE balsa TE top part foam block secured flat table core pinned block epoxy 1/32 plywood tip Use wax paper plywood wont ad block epoxy has cured insert row pins next plywood pinning core tip block Angle-pin root core other pins will removed Core should exact spot cut block Using model cement glue 1/16 balsa sheeting together before skinning wing Using available adhe sives glue sheeting core Place other half block top section just sheeted weight down work other panel both panels sheeted side sheet bottom first re move block trim sheeting Nail other half block table pin core down before sheet second side Weight before Remove later trim Pin cores back blocks glue lead ing trailing edge balsa core using epoxy aliphatic glue glue dry remove cores blocks cut off 1/32 plywood tips trim tips end sheeting Match lengths R L panels trimming tips Reinstall templates used cutting cores mark center leading trailing edges both ends Use straightedge draw line root tip LE TE Get out trusty razor-plane rough shape using reference lines just drawn guide Starting look like wing isnt Finally glue tip block plane sand top bottom curve Cut rounded February 1977 11 Iron Dog tips knife sand tips final shape Now almost ready join wing halves Before cut slot top wing directly over landing gear block Cut slot down LG block ofasizetoacceptthe X ardwood joiner Also cut out servo opening Block up wing tip 1 epoxy wing together epoxy set epoxy joiner top wing Cut out aileron TE Steal wire clothes hanger wife cheapies made thinner wire about 080 thick Ys aluminum tubing clothes hanger wire make up aileron linkage fit application method making up linkage allows get custom linkage have FOAM WING TEMPLATES WING SET AT 0 INCIDENCE WINQ DOWELSBALAI 3/16 DIAII --i CTI TI _ zz ON RECESS FOR SERVO5CR AILERON SERVO1/4 z I/I6 BALSA SKINS OVER FOAM CORES~ BALSA WINOTIPS I/3ZPLY WINGAILERI BOTTOM SURFACE ITRAILING EDGE STOCKONLY LERON-CUT OUT OF WING TE AS SHOWNAILERON TOR UEROC FILL NOSE SECTION WITH BALSA BLOCKS AND SANDHANGERRUNNING IN TO SHAPE CUT OUT OPENING TO SUIT ENGINE &UP AS SHOWN TOROUI HOLLOW OUT TO RECEIVE ENGINE & MOUNT ICH ARE CARVED IP TE STOCK TO RECEIV lAG PLY LLED WITH MICRO-a IS ENGINE LINE THIS BAY WITHSMOOTH IIBSHEET BALSAVERTICAL GRAIN GOLDBERG-- ______ SPINNERN-II I-I/2D1A1% III NE LONG MOUNW___zt_________ I/4PLYI FIREWALL J-BOLTS I/B DIA MUSIC W1~ U AILERON TORQUE ROD TEMPLATE 7 NON-STEERABLE NOSE GEAR IPLY BALSA 3A6 BALSA THROTTLE SERVO RUDDER SERVO ELEVATOR SERVO SIG gWWH CANOPY 1I II II1RECEIJ1ik4I~iLj--------SWITCH ,I, TANKI E~j N SS-4II- ENGINE THRUST LINE SET AT OSIDE THRUST GDOWN THRUSTI/4I/211~I 3/I6BALSABALSA-I/2TRIANGLE STOCKI/8BALSA DOUBLER -IIi INDIA WILLIAMSI-V2DIAWILUANS BROTHERSBRO WHEELS WHEEL 12 Model Aviation w 0 w w n w -I -J U -J w N U -J -J L MAKE LEFT Li RIGHT use compromise size Slot bottom wing install linkage epoxy Inset epoxy 1/32 X 2 X 4 plywood bottom wing partially covering aileron linkage reinforcing rear wing hold down Fill remainder slot micro-balloons resin glass ADE FROM WIRE COAT BRASS TUBEAND BENT RE INSTALLED IN GOOVES DERSIDES OF ThE BALSA THE GROOVE IS ThEN & RESIN AND SANDED center section have never trouble result Leave off save weight main landing gear bent 3/32 music wire secured LG blocks wood screws two small wood screws per side WING LEADING EDGE 3/AI/2RALA NT VIEW OF WING CDdTER SECTION NTS WOOD3/32D1A MUSIC WIRE AILERON TRAVEL 3/l6UP 8 DOWN INSET AILEROI SNUGLY INTO TE 1 Fi 1---- ~-------iL-- RUDDER TRAVEL 3/4 EACH SIDE J 3A6DOWEL r 3/I6BALSA. 1 STABILIZER & ELEVATOR F1 & 1/16 PLY ROCKET CITY HINGES J 3/8 HARDWOODELEVATOI ALSA AIRSCOOP- .JTRAVEL 3/SUP& lit TRIANGLE STOCWL iTI1jli8BALSASIDES --6-32 TEE NUT3/32 BALSA SHEET 6-32BOLT1011123466 iUCSON WINTER NATS LE VESTAST CHAMRCHULA VISTA KENT YMOMAU UARTUH MIOUUT INT WINNER1975QMRC CLUB EXICALI MEXICO EASTER RACE9 Al RACOBRA INKED FOR MODEL AVIATION BY ' / BALSA FIN &RUDOER Back fuselage Remove weird looking thing table Ahead firewall glue doublers inside nose top bottom sides dry cut out right side bolt engine Cover en gine Saran Wrap cut nose length install prop spinner marking around outside spinner get reference line Remove prop spinner razor-plane cut nose down reference mark Cut out 1/16 1/32 plywood fit between spinner nose fuselage Epoxy plywood nose sure allow clearance between spinner plywood Remove engine ready make thing look like fuselage Razorplane desired shape feel need templates use eyeball Glue stab fin Line up fin centerline drew fuselage top Epoxy 3/16 dowels wing leading edge Mark drill holes LE former see 1/16 plywood doubler Check incidence very carefully Wing stab should both zero degrees happy incidence epoxy Y4 plywood rear wing holddown 6-32 blind nut installed prior installing plane Drill hole wing TE line blind nut accept 6-32 bolt Epoxy hardwood servo mount ing boards fuselage sides also strengthen fuselage Epoxy 3/16 balsa across fuselage front servo mounting boards Epoxy 1/32 plywood switch mount top 3/16 balsa just installed Temporarily install elevator rudder throttle servos across fuselage fasten ing mounting boards Mark positions install Nyrod shown elevator rudder pull wires youre install plastic tubing cable 1/32 music wire throttle control Remove servos glue 3/32 balsa bottom rear fuselage Also glue 3/16 balsa bottom front fuselage close front Install wing razor-plane sand lower fuselage shape Remove wing youre ready final sanding finish ing Hinge control surfaces usual manner bearing mind fine minimum clearance gap desirable Finishing Use own method consideration fuse lage fin rudder fill dings poly ester resin micro-balloons use K&B Francis good brand okay After sanding out micro-balloons wipe two coats polyester resin sand ing first coat about 180 grit paper second coat about 220 grit care ful about sanding through bare balsa Spray lacquer primer dry sand off 220-grit paper primer fills pin holes other imperfec tions noticed before Use tack rag clean off dust spray K&B Su per Poxy just enough get good color wings stab use plas February 1977 13 1i tic films because quick light also use plastic trim sheets easy trim ming plane camel-hair brush coat edges film clear urethane var nish prevent fuel creeping under edges done Canopy Used 9 Sig WW II Final height fuselage including canopy should 5 Since canopy must cut down fit fuselage cut down sufficiently bring final height fuselage including canopy minimum 5 Using strips sticky Monokote glue windshield canopy brace lines inside canopy Canopy can glued down epoxy Zap Below Tail surfaces fuselages sides topInstall Radio Adjust aileron throw firewall ready assembly Motor mount3/16 up 3/16 down Elevator throw nose-gear strut mount shown ply-to /8 up /8 down Rudder throw od Powerful rudder avoids steerable strutand t CG shown plan Allup weight should very close 2 lbs build light may have add weight reach 2 lbs minimum Moment truth Radio range checked surfaces neutral engine idles youre ready Takeoff will require little right rudder offset torque Ground accelera tion fast speed reached slight up elevator flies ship flies easily tracks true has no bad flight characteristics opinion rac ing plane should fly way can concentrate pylon polishing trimmed should take very little Try few power stalls just learn plane might react landingnice no snap just drops nose Above Here completed sides attached fuselage top formers pull sides firewall author uses big CClamps padded pieces plywood Right The nose has blocked top fuselage rounded well use razorplane Bottom sheeting completed photo order show Nyrods rudder elevator pull wires 14 Model Aviation Iron Dog Left Wing panel after sheeting Important plywood tip hold camber dur ing sheetingthe foam core thin Right For accurate shaping leading trail ing edges metal straight edge lined up wing template attached wing root Below The two completed wing panels ready join center Note cut outs servo wing brace wing joiner installed after panels joined epoxy has set Right Landing gear wire secured blocks wood screws Wide 1/32 ply trailing edge reinforces wing hold-down Designer does glass center sectionsays save weight Ready land Plane glides flat fast get just off ground start easing just enough elevator bleed off excess speed allow slight nosehigh landing Touch-down can quite slow no danger snap rolling CG set up correctly have youre ready race plane Iron Dog allHot Dog like Go out bring home trophies Above Bottom view wing aileron hardware already place Note wing position dowls align against bottom leading edge February 1977 15
Edition: Model Aviation - 1977/02
Page Numbers: 10, 11, 12, 13, 14, 15
Kent E Thomas s.. S.. SS .. 5SSSSb SSSS S 55 SSS S 55 SSS S 5555S SSSS S 5555 S S S S55SSS 555 S S S SS 1LJ RON DOGE SSSSSSSS 55 S S S S SSSSS SS 555 SS S 555 SSSSSS SS SSS S 555555 .SS. S 5S SS SSS 55555 P55 S S S S 555SS S5 S 55S FOR THE P-39 Airacobra Iron Dog complimentary name such clean beautifully proportioned air plane sleek streamlined shape absence cheek cowls large airscoops makes good subject quarter-mid get racer full-scale plane raced great success just after WW II does qualify eligible design As quarter-midget racer has development about three years past 24 months has brought home trophies other quarter midget Southern California have something good going youre going smileKent Iron Dog Long nose results fact real ship amidships engine location extension shaft running under cockpit prop Start always choose lightest wood can find light airplane close 2 lhs possible desirable Strength has no problem use aliphatic resin glue five-minute epoxy construction except gluing wing sheeting together sheeting wing Zap Hot Stuff will speed up fuselage construction pressed time Fuselage Lay out cut identical right left sides 1/8 balsa Firmly mark LE TE formers firewall thrustline locations inside Glue /2 triangles /8 wing saddle doublers 1/s nose doublers drying cut out 3/16 balsa LE TE formers ood firewall Mark vertical centerline three also mark thrust line firewall usually mark front rear above Cut out LE former tank cradle epoxy 1/16 plywood doubler across bottom support wing dowels Tank cradle cut centerline tank w thrust line use 4-ounce slant Sullivan tank Using centerlines previ ously drawn firewall locate Tatone mount drill holes insert 6-32 blind nuts Mount Tatone mount 6-32 screws Bend /s music wire nose gear Drill firewall below Tatone mount J bolt nose gear firewall Top 1 picture better thousand wordsthe installation Note wing hold-down point Above Conventional aileron linkage aluminum shroud shields servo foul ups Decorative scheme individualistic stand out well air use steerable nose gear Take offs started full throttle rud der steering very positive creating over control plane usually ahead pack going #1 pylon after takeoff due superior ground handling though have go get plane after landing advantage offsets Draw centerline end end 3/16 X 3 balsa fuselage top both sides Pin top flat surface ac curately mark position firewall LE IE formers Epoxy LE TE formers top using L square accu rate alignment Lay out sides using Xacto saw make about four cuts through /2 triangle just behind IE 10 Model Aviation High point winner 1975 QMRC Southern California 22 trophies P-39 Airacobra better Quarter Midgets nation restricted Goodyear types Quarter Midget rules allow wide variety racing planes such P-39 Cobras flew post-war races Thanks engine location real ship very clean nose results model former position Cut through triangle s top bottom triangle Also make about six cuts just ahead LE former top bottom cuts allow fuselage sides bend around formers Epoxy sides together tail post being certain square will create twist fuselage sides glued top usually pinning sides TE former lining marks sides former pull rear together over centerline pin epoxy Now about ready put parts together Get out least large C clamp large enough use across width fuselage scrap pieces ply wood glue pins Before proceeding try fuselage sides proper fit align ment formers Using liberal amount glue thin water necessary glue pin fuselage sides top form ers Using C clamps padded scrap plywood pull sides ahead leading edge until pressing against firewall sides firewall coated glue pressed back against nose doublers sure no down- up-thrust built sighting down along Tatone mount aligning centerline top can assure no side-thrust being built sure centerline firewall aligned center line top everything lined up pin solid double check leave overnight dry Use aliphatic glue allows working time alignment Using care fuselage will come out straight true Well come back fuselage later Tail Cut out stabilizer fin rudder elevator 3/16 balsa Complete ele vator R L cut piece mark ing cutting out Vee center razor-plane sandpaper taper rudder elevator shape LE elevator cut 3/16 3 notch Epoxy 3/16 square hardwood notch epoxy has cured cut out Vee separate R L elevator assures alignment elevators Wing Cut core conventional manner no washout core cut thin great amount care necessary prevent warps twists ing built during skinning process core tip about /s thick al transparent say cant cut foam wings Buy Jack Stafford P-5 quarter-midget wing kit proceed follows First epoxy landing gear boards marked plan cut LE core balsa LE off TE balsa TE top part foam block secured flat table core pinned block epoxy 1/32 plywood tip Use wax paper plywood wont ad block epoxy has cured insert row pins next plywood pinning core tip block Angle-pin root core other pins will removed Core should exact spot cut block Using model cement glue 1/16 balsa sheeting together before skinning wing Using available adhe sives glue sheeting core Place other half block top section just sheeted weight down work other panel both panels sheeted side sheet bottom first re move block trim sheeting Nail other half block table pin core down before sheet second side Weight before Remove later trim Pin cores back blocks glue lead ing trailing edge balsa core using epoxy aliphatic glue glue dry remove cores blocks cut off 1/32 plywood tips trim tips end sheeting Match lengths R L panels trimming tips Reinstall templates used cutting cores mark center leading trailing edges both ends Use straightedge draw line root tip LE TE Get out trusty razor-plane rough shape using reference lines just drawn guide Starting look like wing isnt Finally glue tip block plane sand top bottom curve Cut rounded February 1977 11 Iron Dog tips knife sand tips final shape Now almost ready join wing halves Before cut slot top wing directly over landing gear block Cut slot down LG block ofasizetoacceptthe X ardwood joiner Also cut out servo opening Block up wing tip 1 epoxy wing together epoxy set epoxy joiner top wing Cut out aileron TE Steal wire clothes hanger wife cheapies made thinner wire about 080 thick Ys aluminum tubing clothes hanger wire make up aileron linkage fit application method making up linkage allows get custom linkage have FOAM WING TEMPLATES WING SET AT 0 INCIDENCE WINQ DOWELSBALAI 3/16 DIAII --i CTI TI _ zz ON RECESS FOR SERVO5CR AILERON SERVO1/4 z I/I6 BALSA SKINS OVER FOAM CORES~ BALSA WINOTIPS I/3ZPLY WINGAILERI BOTTOM SURFACE ITRAILING EDGE STOCKONLY LERON-CUT OUT OF WING TE AS SHOWNAILERON TOR UEROC FILL NOSE SECTION WITH BALSA BLOCKS AND SANDHANGERRUNNING IN TO SHAPE CUT OUT OPENING TO SUIT ENGINE &UP AS SHOWN TOROUI HOLLOW OUT TO RECEIVE ENGINE & MOUNT ICH ARE CARVED IP TE STOCK TO RECEIV lAG PLY LLED WITH MICRO-a IS ENGINE LINE THIS BAY WITHSMOOTH IIBSHEET BALSAVERTICAL GRAIN GOLDBERG-- ______ SPINNERN-II I-I/2D1A1% III NE LONG MOUNW___zt_________ I/4PLYI FIREWALL J-BOLTS I/B DIA MUSIC W1~ U AILERON TORQUE ROD TEMPLATE 7 NON-STEERABLE NOSE GEAR IPLY BALSA 3A6 BALSA THROTTLE SERVO RUDDER SERVO ELEVATOR SERVO SIG gWWH CANOPY 1I II II1RECEIJ1ik4I~iLj--------SWITCH ,I, TANKI E~j N SS-4II- ENGINE THRUST LINE SET AT OSIDE THRUST GDOWN THRUSTI/4I/211~I 3/I6BALSABALSA-I/2TRIANGLE STOCKI/8BALSA DOUBLER -IIi INDIA WILLIAMSI-V2DIAWILUANS BROTHERSBRO WHEELS WHEEL 12 Model Aviation w 0 w w n w -I -J U -J w N U -J -J L MAKE LEFT Li RIGHT use compromise size Slot bottom wing install linkage epoxy Inset epoxy 1/32 X 2 X 4 plywood bottom wing partially covering aileron linkage reinforcing rear wing hold down Fill remainder slot micro-balloons resin glass ADE FROM WIRE COAT BRASS TUBEAND BENT RE INSTALLED IN GOOVES DERSIDES OF ThE BALSA THE GROOVE IS ThEN & RESIN AND SANDED center section have never trouble result Leave off save weight main landing gear bent 3/32 music wire secured LG blocks wood screws two small wood screws per side WING LEADING EDGE 3/AI/2RALA NT VIEW OF WING CDdTER SECTION NTS WOOD3/32D1A MUSIC WIRE AILERON TRAVEL 3/l6UP 8 DOWN INSET AILEROI SNUGLY INTO TE 1 Fi 1---- ~-------iL-- RUDDER TRAVEL 3/4 EACH SIDE J 3A6DOWEL r 3/I6BALSA. 1 STABILIZER & ELEVATOR F1 & 1/16 PLY ROCKET CITY HINGES J 3/8 HARDWOODELEVATOI ALSA AIRSCOOP- .JTRAVEL 3/SUP& lit TRIANGLE STOCWL iTI1jli8BALSASIDES --6-32 TEE NUT3/32 BALSA SHEET 6-32BOLT1011123466 iUCSON WINTER NATS LE VESTAST CHAMRCHULA VISTA KENT YMOMAU UARTUH MIOUUT INT WINNER1975QMRC CLUB EXICALI MEXICO EASTER RACE9 Al RACOBRA INKED FOR MODEL AVIATION BY ' / BALSA FIN &RUDOER Back fuselage Remove weird looking thing table Ahead firewall glue doublers inside nose top bottom sides dry cut out right side bolt engine Cover en gine Saran Wrap cut nose length install prop spinner marking around outside spinner get reference line Remove prop spinner razor-plane cut nose down reference mark Cut out 1/16 1/32 plywood fit between spinner nose fuselage Epoxy plywood nose sure allow clearance between spinner plywood Remove engine ready make thing look like fuselage Razorplane desired shape feel need templates use eyeball Glue stab fin Line up fin centerline drew fuselage top Epoxy 3/16 dowels wing leading edge Mark drill holes LE former see 1/16 plywood doubler Check incidence very carefully Wing stab should both zero degrees happy incidence epoxy Y4 plywood rear wing holddown 6-32 blind nut installed prior installing plane Drill hole wing TE line blind nut accept 6-32 bolt Epoxy hardwood servo mount ing boards fuselage sides also strengthen fuselage Epoxy 3/16 balsa across fuselage front servo mounting boards Epoxy 1/32 plywood switch mount top 3/16 balsa just installed Temporarily install elevator rudder throttle servos across fuselage fasten ing mounting boards Mark positions install Nyrod shown elevator rudder pull wires youre install plastic tubing cable 1/32 music wire throttle control Remove servos glue 3/32 balsa bottom rear fuselage Also glue 3/16 balsa bottom front fuselage close front Install wing razor-plane sand lower fuselage shape Remove wing youre ready final sanding finish ing Hinge control surfaces usual manner bearing mind fine minimum clearance gap desirable Finishing Use own method consideration fuse lage fin rudder fill dings poly ester resin micro-balloons use K&B Francis good brand okay After sanding out micro-balloons wipe two coats polyester resin sand ing first coat about 180 grit paper second coat about 220 grit care ful about sanding through bare balsa Spray lacquer primer dry sand off 220-grit paper primer fills pin holes other imperfec tions noticed before Use tack rag clean off dust spray K&B Su per Poxy just enough get good color wings stab use plas February 1977 13 1i tic films because quick light also use plastic trim sheets easy trim ming plane camel-hair brush coat edges film clear urethane var nish prevent fuel creeping under edges done Canopy Used 9 Sig WW II Final height fuselage including canopy should 5 Since canopy must cut down fit fuselage cut down sufficiently bring final height fuselage including canopy minimum 5 Using strips sticky Monokote glue windshield canopy brace lines inside canopy Canopy can glued down epoxy Zap Below Tail surfaces fuselages sides topInstall Radio Adjust aileron throw firewall ready assembly Motor mount3/16 up 3/16 down Elevator throw nose-gear strut mount shown ply-to /8 up /8 down Rudder throw od Powerful rudder avoids steerable strutand t CG shown plan Allup weight should very close 2 lbs build light may have add weight reach 2 lbs minimum Moment truth Radio range checked surfaces neutral engine idles youre ready Takeoff will require little right rudder offset torque Ground accelera tion fast speed reached slight up elevator flies ship flies easily tracks true has no bad flight characteristics opinion rac ing plane should fly way can concentrate pylon polishing trimmed should take very little Try few power stalls just learn plane might react landingnice no snap just drops nose Above Here completed sides attached fuselage top formers pull sides firewall author uses big CClamps padded pieces plywood Right The nose has blocked top fuselage rounded well use razorplane Bottom sheeting completed photo order show Nyrods rudder elevator pull wires 14 Model Aviation Iron Dog Left Wing panel after sheeting Important plywood tip hold camber dur ing sheetingthe foam core thin Right For accurate shaping leading trail ing edges metal straight edge lined up wing template attached wing root Below The two completed wing panels ready join center Note cut outs servo wing brace wing joiner installed after panels joined epoxy has set Right Landing gear wire secured blocks wood screws Wide 1/32 ply trailing edge reinforces wing hold-down Designer does glass center sectionsays save weight Ready land Plane glides flat fast get just off ground start easing just enough elevator bleed off excess speed allow slight nosehigh landing Touch-down can quite slow no danger snap rolling CG set up correctly have youre ready race plane Iron Dog allHot Dog like Go out bring home trophies Above Bottom view wing aileron hardware already place Note wing position dowls align against bottom leading edge February 1977 15
Edition: Model Aviation - 1977/02
Page Numbers: 10, 11, 12, 13, 14, 15
Kent E Thomas s.. S.. SS .. 5SSSSb SSSS S 55 SSS S 55 SSS S 5555S SSSS S 5555 S S S S55SSS 555 S S S SS 1LJ RON DOGE SSSSSSSS 55 S S S S SSSSS SS 555 SS S 555 SSSSSS SS SSS S 555555 .SS. S 5S SS SSS 55555 P55 S S S S 555SS S5 S 55S FOR THE P-39 Airacobra Iron Dog complimentary name such clean beautifully proportioned air plane sleek streamlined shape absence cheek cowls large airscoops makes good subject quarter-mid get racer full-scale plane raced great success just after WW II does qualify eligible design As quarter-midget racer has development about three years past 24 months has brought home trophies other quarter midget Southern California have something good going youre going smileKent Iron Dog Long nose results fact real ship amidships engine location extension shaft running under cockpit prop Start always choose lightest wood can find light airplane close 2 lhs possible desirable Strength has no problem use aliphatic resin glue five-minute epoxy construction except gluing wing sheeting together sheeting wing Zap Hot Stuff will speed up fuselage construction pressed time Fuselage Lay out cut identical right left sides 1/8 balsa Firmly mark LE TE formers firewall thrustline locations inside Glue /2 triangles /8 wing saddle doublers 1/s nose doublers drying cut out 3/16 balsa LE TE formers ood firewall Mark vertical centerline three also mark thrust line firewall usually mark front rear above Cut out LE former tank cradle epoxy 1/16 plywood doubler across bottom support wing dowels Tank cradle cut centerline tank w thrust line use 4-ounce slant Sullivan tank Using centerlines previ ously drawn firewall locate Tatone mount drill holes insert 6-32 blind nuts Mount Tatone mount 6-32 screws Bend /s music wire nose gear Drill firewall below Tatone mount J bolt nose gear firewall Top 1 picture better thousand wordsthe installation Note wing hold-down point Above Conventional aileron linkage aluminum shroud shields servo foul ups Decorative scheme individualistic stand out well air use steerable nose gear Take offs started full throttle rud der steering very positive creating over control plane usually ahead pack going #1 pylon after takeoff due superior ground handling though have go get plane after landing advantage offsets Draw centerline end end 3/16 X 3 balsa fuselage top both sides Pin top flat surface ac curately mark position firewall LE IE formers Epoxy LE TE formers top using L square accu rate alignment Lay out sides using Xacto saw make about four cuts through /2 triangle just behind IE 10 Model Aviation High point winner 1975 QMRC Southern California 22 trophies P-39 Airacobra better Quarter Midgets nation restricted Goodyear types Quarter Midget rules allow wide variety racing planes such P-39 Cobras flew post-war races Thanks engine location real ship very clean nose results model former position Cut through triangle s top bottom triangle Also make about six cuts just ahead LE former top bottom cuts allow fuselage sides bend around formers Epoxy sides together tail post being certain square will create twist fuselage sides glued top usually pinning sides TE former lining marks sides former pull rear together over centerline pin epoxy Now about ready put parts together Get out least large C clamp large enough use across width fuselage scrap pieces ply wood glue pins Before proceeding try fuselage sides proper fit align ment formers Using liberal amount glue thin water necessary glue pin fuselage sides top form ers Using C clamps padded scrap plywood pull sides ahead leading edge until pressing against firewall sides firewall coated glue pressed back against nose doublers sure no down- up-thrust built sighting down along Tatone mount aligning centerline top can assure no side-thrust being built sure centerline firewall aligned center line top everything lined up pin solid double check leave overnight dry Use aliphatic glue allows working time alignment Using care fuselage will come out straight true Well come back fuselage later Tail Cut out stabilizer fin rudder elevator 3/16 balsa Complete ele vator R L cut piece mark ing cutting out Vee center razor-plane sandpaper taper rudder elevator shape LE elevator cut 3/16 3 notch Epoxy 3/16 square hardwood notch epoxy has cured cut out Vee separate R L elevator assures alignment elevators Wing Cut core conventional manner no washout core cut thin great amount care necessary prevent warps twists ing built during skinning process core tip about /s thick al transparent say cant cut foam wings Buy Jack Stafford P-5 quarter-midget wing kit proceed follows First epoxy landing gear boards marked plan cut LE core balsa LE off TE balsa TE top part foam block secured flat table core pinned block epoxy 1/32 plywood tip Use wax paper plywood wont ad block epoxy has cured insert row pins next plywood pinning core tip block Angle-pin root core other pins will removed Core should exact spot cut block Using model cement glue 1/16 balsa sheeting together before skinning wing Using available adhe sives glue sheeting core Place other half block top section just sheeted weight down work other panel both panels sheeted side sheet bottom first re move block trim sheeting Nail other half block table pin core down before sheet second side Weight before Remove later trim Pin cores back blocks glue lead ing trailing edge balsa core using epoxy aliphatic glue glue dry remove cores blocks cut off 1/32 plywood tips trim tips end sheeting Match lengths R L panels trimming tips Reinstall templates used cutting cores mark center leading trailing edges both ends Use straightedge draw line root tip LE TE Get out trusty razor-plane rough shape using reference lines just drawn guide Starting look like wing isnt Finally glue tip block plane sand top bottom curve Cut rounded February 1977 11 Iron Dog tips knife sand tips final shape Now almost ready join wing halves Before cut slot top wing directly over landing gear block Cut slot down LG block ofasizetoacceptthe X ardwood joiner Also cut out servo opening Block up wing tip 1 epoxy wing together epoxy set epoxy joiner top wing Cut out aileron TE Steal wire clothes hanger wife cheapies made thinner wire about 080 thick Ys aluminum tubing clothes hanger wire make up aileron linkage fit application method making up linkage allows get custom linkage have FOAM WING TEMPLATES WING SET AT 0 INCIDENCE WINQ DOWELSBALAI 3/16 DIAII --i CTI TI _ zz ON RECESS FOR SERVO5CR AILERON SERVO1/4 z I/I6 BALSA SKINS OVER FOAM CORES~ BALSA WINOTIPS I/3ZPLY WINGAILERI BOTTOM SURFACE ITRAILING EDGE STOCKONLY LERON-CUT OUT OF WING TE AS SHOWNAILERON TOR UEROC FILL NOSE SECTION WITH BALSA BLOCKS AND SANDHANGERRUNNING IN TO SHAPE CUT OUT OPENING TO SUIT ENGINE &UP AS SHOWN TOROUI HOLLOW OUT TO RECEIVE ENGINE & MOUNT ICH ARE CARVED IP TE STOCK TO RECEIV lAG PLY LLED WITH MICRO-a IS ENGINE LINE THIS BAY WITHSMOOTH IIBSHEET BALSAVERTICAL GRAIN GOLDBERG-- ______ SPINNERN-II I-I/2D1A1% III NE LONG MOUNW___zt_________ I/4PLYI FIREWALL J-BOLTS I/B DIA MUSIC W1~ U AILERON TORQUE ROD TEMPLATE 7 NON-STEERABLE NOSE GEAR IPLY BALSA 3A6 BALSA THROTTLE SERVO RUDDER SERVO ELEVATOR SERVO SIG gWWH CANOPY 1I II II1RECEIJ1ik4I~iLj--------SWITCH ,I, TANKI E~j N SS-4II- ENGINE THRUST LINE SET AT OSIDE THRUST GDOWN THRUSTI/4I/211~I 3/I6BALSABALSA-I/2TRIANGLE STOCKI/8BALSA DOUBLER -IIi INDIA WILLIAMSI-V2DIAWILUANS BROTHERSBRO WHEELS WHEEL 12 Model Aviation w 0 w w n w -I -J U -J w N U -J -J L MAKE LEFT Li RIGHT use compromise size Slot bottom wing install linkage epoxy Inset epoxy 1/32 X 2 X 4 plywood bottom wing partially covering aileron linkage reinforcing rear wing hold down Fill remainder slot micro-balloons resin glass ADE FROM WIRE COAT BRASS TUBEAND BENT RE INSTALLED IN GOOVES DERSIDES OF ThE BALSA THE GROOVE IS ThEN & RESIN AND SANDED center section have never trouble result Leave off save weight main landing gear bent 3/32 music wire secured LG blocks wood screws two small wood screws per side WING LEADING EDGE 3/AI/2RALA NT VIEW OF WING CDdTER SECTION NTS WOOD3/32D1A MUSIC WIRE AILERON TRAVEL 3/l6UP 8 DOWN INSET AILEROI SNUGLY INTO TE 1 Fi 1---- ~-------iL-- RUDDER TRAVEL 3/4 EACH SIDE J 3A6DOWEL r 3/I6BALSA. 1 STABILIZER & ELEVATOR F1 & 1/16 PLY ROCKET CITY HINGES J 3/8 HARDWOODELEVATOI ALSA AIRSCOOP- .JTRAVEL 3/SUP& lit TRIANGLE STOCWL iTI1jli8BALSASIDES --6-32 TEE NUT3/32 BALSA SHEET 6-32BOLT1011123466 iUCSON WINTER NATS LE VESTAST CHAMRCHULA VISTA KENT YMOMAU UARTUH MIOUUT INT WINNER1975QMRC CLUB EXICALI MEXICO EASTER RACE9 Al RACOBRA INKED FOR MODEL AVIATION BY ' / BALSA FIN &RUDOER Back fuselage Remove weird looking thing table Ahead firewall glue doublers inside nose top bottom sides dry cut out right side bolt engine Cover en gine Saran Wrap cut nose length install prop spinner marking around outside spinner get reference line Remove prop spinner razor-plane cut nose down reference mark Cut out 1/16 1/32 plywood fit between spinner nose fuselage Epoxy plywood nose sure allow clearance between spinner plywood Remove engine ready make thing look like fuselage Razorplane desired shape feel need templates use eyeball Glue stab fin Line up fin centerline drew fuselage top Epoxy 3/16 dowels wing leading edge Mark drill holes LE former see 1/16 plywood doubler Check incidence very carefully Wing stab should both zero degrees happy incidence epoxy Y4 plywood rear wing holddown 6-32 blind nut installed prior installing plane Drill hole wing TE line blind nut accept 6-32 bolt Epoxy hardwood servo mount ing boards fuselage sides also strengthen fuselage Epoxy 3/16 balsa across fuselage front servo mounting boards Epoxy 1/32 plywood switch mount top 3/16 balsa just installed Temporarily install elevator rudder throttle servos across fuselage fasten ing mounting boards Mark positions install Nyrod shown elevator rudder pull wires youre install plastic tubing cable 1/32 music wire throttle control Remove servos glue 3/32 balsa bottom rear fuselage Also glue 3/16 balsa bottom front fuselage close front Install wing razor-plane sand lower fuselage shape Remove wing youre ready final sanding finish ing Hinge control surfaces usual manner bearing mind fine minimum clearance gap desirable Finishing Use own method consideration fuse lage fin rudder fill dings poly ester resin micro-balloons use K&B Francis good brand okay After sanding out micro-balloons wipe two coats polyester resin sand ing first coat about 180 grit paper second coat about 220 grit care ful about sanding through bare balsa Spray lacquer primer dry sand off 220-grit paper primer fills pin holes other imperfec tions noticed before Use tack rag clean off dust spray K&B Su per Poxy just enough get good color wings stab use plas February 1977 13 1i tic films because quick light also use plastic trim sheets easy trim ming plane camel-hair brush coat edges film clear urethane var nish prevent fuel creeping under edges done Canopy Used 9 Sig WW II Final height fuselage including canopy should 5 Since canopy must cut down fit fuselage cut down sufficiently bring final height fuselage including canopy minimum 5 Using strips sticky Monokote glue windshield canopy brace lines inside canopy Canopy can glued down epoxy Zap Below Tail surfaces fuselages sides topInstall Radio Adjust aileron throw firewall ready assembly Motor mount3/16 up 3/16 down Elevator throw nose-gear strut mount shown ply-to /8 up /8 down Rudder throw od Powerful rudder avoids steerable strutand t CG shown plan Allup weight should very close 2 lbs build light may have add weight reach 2 lbs minimum Moment truth Radio range checked surfaces neutral engine idles youre ready Takeoff will require little right rudder offset torque Ground accelera tion fast speed reached slight up elevator flies ship flies easily tracks true has no bad flight characteristics opinion rac ing plane should fly way can concentrate pylon polishing trimmed should take very little Try few power stalls just learn plane might react landingnice no snap just drops nose Above Here completed sides attached fuselage top formers pull sides firewall author uses big CClamps padded pieces plywood Right The nose has blocked top fuselage rounded well use razorplane Bottom sheeting completed photo order show Nyrods rudder elevator pull wires 14 Model Aviation Iron Dog Left Wing panel after sheeting Important plywood tip hold camber dur ing sheetingthe foam core thin Right For accurate shaping leading trail ing edges metal straight edge lined up wing template attached wing root Below The two completed wing panels ready join center Note cut outs servo wing brace wing joiner installed after panels joined epoxy has set Right Landing gear wire secured blocks wood screws Wide 1/32 ply trailing edge reinforces wing hold-down Designer does glass center sectionsays save weight Ready land Plane glides flat fast get just off ground start easing just enough elevator bleed off excess speed allow slight nosehigh landing Touch-down can quite slow no danger snap rolling CG set up correctly have youre ready race plane Iron Dog allHot Dog like Go out bring home trophies Above Bottom view wing aileron hardware already place Note wing position dowls align against bottom leading edge February 1977 15