/ Stearman Cloudboy
The Stearman Model 6 Cloudboy was a 1930s American training biplane.
The Cloudboy was designed as a commercial or military trainer.
Due to economic pressure during the Great Depression, only a few aircraft were built.
Three civil models were built, followed by four similar aircraft for evaluation by the United States Army Air Corps.
Designated YPT-9 by the Army, it failed to gain any orders.
All models went through a number of engine changes (resulting in new designations for both the military and civil aircraft).
Model 6A Cloudboy
Initial civil production with a 165 hp (123 kW) Wright J-6 Whirlwind 5 engine, three built.
Model 6C Cloudboy
Re-engined with a 300 hp (220 kW) Wright J-6-9 Whirlwind (R-975-1), also designated YBT-3.
Model 6D Cloudboy
Re-engined with a 300 hp (220 kW) Pratt & Whitney Wasp Junior, also designated YBT-5
Model 6F Cloudboy
Re-engined with a 165 hp (123 kW) Continental A70 engine, also designated YBT-9A.
Model 6H Cloudboy
Re-engined with a 170 hp (130 kW) Kinner YR-720A engine, also designated YBT-9C.
Model 6L Cloudboy
Re-engined with a 200 hp (150 kW) Lycoming R-680-3 engine, also designated YBT-9B
Model 6P Cloudboy
One 6F re-engined with 1 220 hp (160 kW) Wright J-5 engine
Military production variant of the Model 6A with a 165 hp (123 kW) Wright J-6 Whirlwind 5 engine.
One YPT-9 re-engined with a 165 hp (123 kW) Continental A70 (YR-545-1) engine, later converted to YPT-9B.
One YPT-9 and one YPT-9A re-engined with a 200 hp (150 kW) Lycoming R-680-3 engine.
YBT-3 re-engined with a 170 hp (130 kW) Kinner YR-720A engine.
One YPT-9 re-engined with a 300 hp (220 kW) Wright J-6-9 Whirlwind, later converted to a YPT-9C.
One YPT-9 re-engined with a 300 hp (220 kW) Pratt & Whitney R-985-1 Wasp Junior engine.
A primary trainer derived from the 6A for evaluation at Wright Field.
Formed the origins of the Stearman NS and PT-13 for the US Navy and USAAC respectively.
Alternative company designation for the XPT-943.
24 ft 8 in (7.52 m)
32 ft 0 in (9.76 m)
9 ft 7 in (2.92 m)
272 sq ft (25.3 m2)
2,814 lb (1,279 kg)
1 × Lycoming R-680-3 , 200 hp (149 kW)
135 mph (217 km/h, 117 kn)
490 mi (789 km, 430 nmi)
17,000 ft (5,183 m)
Rate of climb
1,050 ft/min (5.3 m/s)
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