North American Model 35
Designed in 1937, the Model 35 was North American's bid at a small modern trainer for the Army Air Corps. Evaluated by the military in 1939, North American found itself swamped with work building AT-6s, B-25s and P-51s, so the plans were sold off to the Vega Aircraft Company, a division of Lockheed. Again, Lockheed found itself far too busy building warplanes to worry about the little trainer, and the project was forgotten.
Only five aircraft were built: one by North American, and four by Vega.
The plane has a crew of two: pupil and instructor. The plane uses 5 gallons of aviation fuel per hour at routine usage. A full load of fuel costs $4.80. The plane had a historical range of 305 miles at a cruising speed of 124 mph and an endurance of 2.5 hours (all at 75% of the engine's full power).
Subassemblies: Recon Fighter chassis +2; Recon Plane wings +2; 3 fixed wheels +0.
Powertrain: 112-kW aerial Turbocharged gasoline engine with 112-kW prop and 24-gallon fuel tank [Body], 4,000 kWs battery.
Occ.: 2 XCS Body
Cargo: 7 Body
Armor F RL B T U
All: 2/3 2/3 2/3 2/3 2/3
Body: Backup driver option, autopilot, small radio transmitter and receiver (3-mile range), navigation instruments.
Size: 25'x30'x9' Payload: 0.27 tons Lwt.: 0.88 tons
Volume: 96 Maint.: 126 hours Cost: $2,521
HT: 7. HPs: 15 Body, 25 each Wing, 2 each Wheel.
aSpeed: 131 aAccel: 4 aDecel: 20 aMR: 5 aSR: 1
Stall Speed: 48 mph. Take Off Run: 256 yards. Landing Run: 230 yards.
gSpeed: 181 gAccel: 9 gDecel: 10 gMR: 0.5 gSR: 2
Ground Pressure: High. 1/6 Off-Road Speed.
Historical wing area was 148 sf. Design loaded weight was 1,758 lbs.; it was increased 2 lbs. to the historical. Design aSpeed was 131 mph; design stall speed was 47 mph. Historical values were used for all calculations when available. A 30-gallon fuel tank was purchased for the design; the historical 24-gallon capacity is shown. Using the calculated gSpeed at 1/6 Off-Road speed (30 mph) gSpeed is 63% of stall speed, allowing the aircraft to get airborne from a rough field with a light (4 mph) tailwind, at the GM's discretion.
Two of the Vega machines received 160-hp engines. Plans were made to fit the NA-35 with other engines and an enclosed cockpit, but these ideas never made it past the paper stage.
From the Aerodrome for GURPS
© 2009 by Jim Antonicic