Stearman Cloudboy

Model 6 Cloudboy
The YBT-3
Role Training biplane
Manufacturer Stearman Aircraft Company
First flight 1931
Primary user United States Army Air Corps
Produced 1930-1931
Number built 7


The Stearman Model 6 Cloudboy was a 1930s American training biplane designed and built by the Stearman Aircraft Company of Wichita, Kansas.

History

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).

Today, the Cloudboy is an extremely rare aircraft; only four Model 6 Cloudboys are still registered. Known examples include: N787H, serial number 6002, owned by Ronald Alexander and displayed at the Candler Field Museum in Williamson, Georgia;[1] N788H, serial number 6003, on display at the Golden Wings Flying Museum in Blaine, Minnesota;[2] N795H, serial number 6004, on display at the Yanks Air Museum in Chino, California; N786H, serial number 6010.

Variants

Model 6L Stearman Cloudboy (YBT-9B), N787H
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
YBT-5
Model 6P Cloudboy
One 6F re-engined with 1 220 hp (160 kW) Wright J-5 engine
YPT-9
Military production variant of the Model 6A with a 165 hp (123 kW) Wright J-6 Whirlwind 5 engine, four built (one converted to YPT-9A, one to YPT-9B, one to YBT-3 and one YBT-5).
YPT-9A
One YPT-9 re-engined with a 165 hp (123 kW) Continental A70 (YR-545-1) engine, later converted to YPT-9B.
YPT-9B
One YPT-9 and one YPT-9A re-engined with a 200 hp (150 kW) Lycoming R-680-3 engine.
YPT-9C
YBT-3 re-engined with a 170 hp (130 kW) Kinner YR-720A engine.
YBT-3
One YBT-9 re-engined with a 300 hp (220 kW) Wright J-6-9 Whirlwind, later converted to a YPT-9C.
YBT-5
One YBT-9 re-engined with a 300 hp (220 kW) Pratt & Whitney R-985-1 Wasp Junior engine.
XPT-943
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.
X-70
Alternative company designation for the XPT-943.

Operators

 United States
United States Army Air Corps

Specifications (YPT-9B)

Data from United States Military Aircraft since 1909[3]

General characteristics

Performance

See also


Related lists

References

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