Formula 40 SpeedA Natural March edition Model viation started in-depth discussion mula 40 Speed missed March May editions interested learning what think know about competing Formula 40 Speed might want beg borrow steal above two mentioned copies MIA column will make sense have far discussed AMA rules Phill Dubs rules applicable mula 40 Speed specific airframe design general edition will attempt complete designs get back normal format discussing Speed general May edition MIA dis cussed Airframe Design Light Strong Balance Wings Airfoil High Point Taper Leading Edge Wing Stab Control Surfaces Control System Horn Length Bellcrank Length Crank Arm Length Line Spacing Flying Han dle Lets now move completing designs say designs because started out design two different Formula 40 Ships along traditional Rat Racer lines along traditional Proto Speed lines two designs used general guidelines intended give two different approaches Formula 40 Speed intended no way represent final word Formula 40 Airframe Design going design 90 sq Formula 40 ship 125 sq Formula 40 ship around available material Formula 40 Speed 90 Sq Basic Design Fuselage Lets design 90 sq Formula 40 Ship around Darp B Speed Pan going use Darp Pen keep weight down think should design -pan airframe past exper ience know pan needs approxi mately 111/4 long give us enough room mount engine leave room tank fuel need approximately 45 cc s fuel set carburetion run 14 laps varies time required set needle valve amount nitro fuel generally 45 ccs fuel good place start overall fuselage length going 17 front pan front spinner fuselage width front going fit contour Super tigre 29 spinner shall adapt fit engine choice Wing wing going made 5/16 thick piece white bass wood measure 4 root chord 3 tip chord 24 over length leading edge will straight airfoil symmetrical Stab stab going measure 39 sq in area made /i white bass measure 3 root 3 tip 12 in overall length Speed trailing edge will straight airfoil symmetrical Control System Horn Length Bellcrank Length Crank Arm Length Size Elevator have previously discussed pushrod should made 1/16 music wire flex flight Construction fuselage crutch cut piece k white bass sides should left /s POOHAWK 90 SQUARE FORMULA 40 Pa OHAWK 125 SQUARE FORMULA 40 Phill Bussell thick wing should mounted top k crutch will allow enough room surgical tubing tank no false pressure rest designcowl height shape fuse lage shape shall depend personal pref erence stab should mounted 00 incidence relation wing prac tical purposes stab should perma nently mounted pan side fuse lage crutch bottom crutch should notched accept /8 thick stab back bottom rear portion behind pan fuselage should shaped hollowed piece bass wood glued epoxy glue pan side fuselage crutch need one-wheel gear shall measure least 4V4 ground centerline pan individual parts air frame shall rough finished before assembly manner can attach parts temporarily find prop er wing location see May issue prop er balance point location Now wing location has determined wing should permanently glued place next stab now rest air frame Let briefly discuss locate wing parts airframe individually semi-finished before final assembly can rubberband wing crutch pan rubberband stab bottom back half fuse lage crutch now can place fuselage top planking place cowl place engine mounted pan prop spinner gear attached Now need move wing back forth along top fuse lage until proper balance point lo cated Now move wing back little farther necessary balance airframe allow paint nose should hang down about 7 cowl block should made hard balsa light white bass fuselage top white bass Now airframe permanently glued together should prepared finishing am going take time go finishing time will suggest epoxy high nitro resistant finish should used use coat polyester surfacing resin coat primer coat epoxy color makes light durable finish 125 Sq Formula 40 Basic Design Lets design 125 sq airframe around Harters Proto Pan Harters pan made die-case magnesium very light reason lets use full length fuselage crutch still needs continued page 83 August 1976 31 Name Addrns City ____________________ 7in miowes PRODUCTS CD 400 South Indiana St Hobart Indiana 46342 partment balance model shown plans builder doesnt get carried away paint covering stab fin model will balance two ounces tare weight Hand glide model check trim ready try first launch recommend locate tow hook approximately ahead CG first several launches move back /4 time until approximately 1 behind CG further back can move tow hook sailplane becoming too unstable during tow higher launch can obtain using electric winch keep speed down will use up less line 0-10 knot winds prefer fly air plane additional weight Above 10 knots can add up lb lead weight compartment using 4-oz slug place third tube back front want 8 oz additional weight place lead slugs second fourth holes want 12 oz use back three holes arrangements will maintain CG loca tion very windy conditions slope soaring place fourth weight front tube will shift CG slightly ward better handling Good luck send photographs trophies CL Speed/Bussell continued page 31 made out /2 thick bass over length will approximately 19 long approximate length Harters pan after pan cut match diameter Supertigre 29 spinner engine mounted Lets make wing /t thick hard 6 lb 8 lb C grain balsa can save little weight over bass wing very important big airframe wing will 25 long 6 root 4 tip chord Use /8 X 3 bass maple spar mount control system tie down bolts wing leading edge straight wing taper trailing edge airfoil symmetrical 30% high point Stab stab going measure 39 sq in area should made 3/16 hard balsa root chord 3 tip chord 2 overall length 13 rest design very similar construction techniques speed ship cowl height shape depends engine used personal preference fuselage top should made hard balsa again wing location found 90 sq design pre-assembling component parts airframe moving wing fore aft until C/G located right line outlet Allow about 70 100 nose drop allow paint perma nently attach wing top crutch carving wing always leave flat section bottom wide enough mount wing crutch comes time permanently mount wing top crutch dont have measure wing alignment know wing mounted 00 angle attack very important wing stab mounted 00 angle attack engine thrust line Finish finish big airframe very important care should given bird will overweight After airframe assembled finished sanded bad spots puttied recommend cover balsa parts clear dope tissue coat primer coat epoxy color should give good light finish next column will discuss en gines props fuel limited rework procedures address 4803 Fallon P1 Dallas TX 75227 Safe Flying No Accident August1976 83 crisp lines slice Through sky Matador ready battle stream L wo spars sheeted leading trailing edge pivoted Stabilator lined motor pod locked wing having Please send illustrated carried ends plywood tailbooms hardware wire catalogofmodelsandaccessorles supplied including bushed aluminum 3 bellcrank Enclosed 25t components forthe bladdertype pressure tank 42 wing /RIcE\ __________________ U-Control model 35 cu engines Fast Combat Rich Von Lopez13 ______________________KIT #248
Edition: Model Aviation - 1976/08
Page Numbers: 31, 83
Formula 40 SpeedA Natural March edition Model viation started in-depth discussion mula 40 Speed missed March May editions interested learning what think know about competing Formula 40 Speed might want beg borrow steal above two mentioned copies MIA column will make sense have far discussed AMA rules Phill Dubs rules applicable mula 40 Speed specific airframe design general edition will attempt complete designs get back normal format discussing Speed general May edition MIA dis cussed Airframe Design Light Strong Balance Wings Airfoil High Point Taper Leading Edge Wing Stab Control Surfaces Control System Horn Length Bellcrank Length Crank Arm Length Line Spacing Flying Han dle Lets now move completing designs say designs because started out design two different Formula 40 Ships along traditional Rat Racer lines along traditional Proto Speed lines two designs used general guidelines intended give two different approaches Formula 40 Speed intended no way represent final word Formula 40 Airframe Design going design 90 sq Formula 40 ship 125 sq Formula 40 ship around available material Formula 40 Speed 90 Sq Basic Design Fuselage Lets design 90 sq Formula 40 Ship around Darp B Speed Pan going use Darp Pen keep weight down think should design -pan airframe past exper ience know pan needs approxi mately 111/4 long give us enough room mount engine leave room tank fuel need approximately 45 cc s fuel set carburetion run 14 laps varies time required set needle valve amount nitro fuel generally 45 ccs fuel good place start overall fuselage length going 17 front pan front spinner fuselage width front going fit contour Super tigre 29 spinner shall adapt fit engine choice Wing wing going made 5/16 thick piece white bass wood measure 4 root chord 3 tip chord 24 over length leading edge will straight airfoil symmetrical Stab stab going measure 39 sq in area made /i white bass measure 3 root 3 tip 12 in overall length Speed trailing edge will straight airfoil symmetrical Control System Horn Length Bellcrank Length Crank Arm Length Size Elevator have previously discussed pushrod should made 1/16 music wire flex flight Construction fuselage crutch cut piece k white bass sides should left /s POOHAWK 90 SQUARE FORMULA 40 Pa OHAWK 125 SQUARE FORMULA 40 Phill Bussell thick wing should mounted top k crutch will allow enough room surgical tubing tank no false pressure rest designcowl height shape fuse lage shape shall depend personal pref erence stab should mounted 00 incidence relation wing prac tical purposes stab should perma nently mounted pan side fuse lage crutch bottom crutch should notched accept /8 thick stab back bottom rear portion behind pan fuselage should shaped hollowed piece bass wood glued epoxy glue pan side fuselage crutch need one-wheel gear shall measure least 4V4 ground centerline pan individual parts air frame shall rough finished before assembly manner can attach parts temporarily find prop er wing location see May issue prop er balance point location Now wing location has determined wing should permanently glued place next stab now rest air frame Let briefly discuss locate wing parts airframe individually semi-finished before final assembly can rubberband wing crutch pan rubberband stab bottom back half fuse lage crutch now can place fuselage top planking place cowl place engine mounted pan prop spinner gear attached Now need move wing back forth along top fuse lage until proper balance point lo cated Now move wing back little farther necessary balance airframe allow paint nose should hang down about 7 cowl block should made hard balsa light white bass fuselage top white bass Now airframe permanently glued together should prepared finishing am going take time go finishing time will suggest epoxy high nitro resistant finish should used use coat polyester surfacing resin coat primer coat epoxy color makes light durable finish 125 Sq Formula 40 Basic Design Lets design 125 sq airframe around Harters Proto Pan Harters pan made die-case magnesium very light reason lets use full length fuselage crutch still needs continued page 83 August 1976 31 Name Addrns City ____________________ 7in miowes PRODUCTS CD 400 South Indiana St Hobart Indiana 46342 partment balance model shown plans builder doesnt get carried away paint covering stab fin model will balance two ounces tare weight Hand glide model check trim ready try first launch recommend locate tow hook approximately ahead CG first several launches move back /4 time until approximately 1 behind CG further back can move tow hook sailplane becoming too unstable during tow higher launch can obtain using electric winch keep speed down will use up less line 0-10 knot winds prefer fly air plane additional weight Above 10 knots can add up lb lead weight compartment using 4-oz slug place third tube back front want 8 oz additional weight place lead slugs second fourth holes want 12 oz use back three holes arrangements will maintain CG loca tion very windy conditions slope soaring place fourth weight front tube will shift CG slightly ward better handling Good luck send photographs trophies CL Speed/Bussell continued page 31 made out /2 thick bass over length will approximately 19 long approximate length Harters pan after pan cut match diameter Supertigre 29 spinner engine mounted Lets make wing /t thick hard 6 lb 8 lb C grain balsa can save little weight over bass wing very important big airframe wing will 25 long 6 root 4 tip chord Use /8 X 3 bass maple spar mount control system tie down bolts wing leading edge straight wing taper trailing edge airfoil symmetrical 30% high point Stab stab going measure 39 sq in area should made 3/16 hard balsa root chord 3 tip chord 2 overall length 13 rest design very similar construction techniques speed ship cowl height shape depends engine used personal preference fuselage top should made hard balsa again wing location found 90 sq design pre-assembling component parts airframe moving wing fore aft until C/G located right line outlet Allow about 70 100 nose drop allow paint perma nently attach wing top crutch carving wing always leave flat section bottom wide enough mount wing crutch comes time permanently mount wing top crutch dont have measure wing alignment know wing mounted 00 angle attack very important wing stab mounted 00 angle attack engine thrust line Finish finish big airframe very important care should given bird will overweight After airframe assembled finished sanded bad spots puttied recommend cover balsa parts clear dope tissue coat primer coat epoxy color should give good light finish next column will discuss en gines props fuel limited rework procedures address 4803 Fallon P1 Dallas TX 75227 Safe Flying No Accident August1976 83 crisp lines slice Through sky Matador ready battle stream L wo spars sheeted leading trailing edge pivoted Stabilator lined motor pod locked wing having Please send illustrated carried ends plywood tailbooms hardware wire catalogofmodelsandaccessorles supplied including bushed aluminum 3 bellcrank Enclosed 25t components forthe bladdertype pressure tank 42 wing /RIcE\ __________________ U-Control model 35 cu engines Fast Combat Rich Von Lopez13 ______________________KIT #248