Stearman Cloudboy - Variants

Variants

Model 6A Cloudboy
Initial civil production with a 165hp (123kW) Wright J-6 Whirlwind 5 engine, three built.
Model 6C Cloudboy
Re-engined with a 300hp (224kW) Wright J-6-9 Whirlwind (R-975-1), also designated YBT-3.
Model 6D Cloudboy
Re-engined with a 300hp (224kW) Pratt & Whitney Wasp Junior, also designated YBT-5
Model 6F Cloudboy
Re-engined with a 165hp (123kW) Continental A70 engine., also designated YBT-9A.
Model 6H Cloudboy
Re-engined with a 170hp (127kW) Kinner YR-720A engine, also designated YBT-9C.
Model 6L Cloudboy
Re-engined with a 200hp (149kW) Lycoming R-680-3 engine, also designated YBT-9B
Model 6P Cloudboy
One 6F re-engined with 1 220hp Wright J-5 engine
YPT-9
Military production variant of the Model 6A with a 165hp (123kW) 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 165hp (123kW) Continental A70 (YR-545-1) engine, later converted to YPT-9B.
YPT-9B
One YPT-9 and one YPT-9A re-engined with a 200hp (149kW) Lycoming R-680-3 engine.
YPT-9C
YBT-3 re-engined with a 170hp (127kW) Kinner YR-720A engine.
YBT-3
One YBT-9 re-engined with a 300hp (224kW) Wright J-6-9 Whirlwind, later converted to a YPT-9C.
YBT-5
One YBT-9 re-engined with a 300hp (224kW) Pratt & Whitney Wasp Junior engine.
XPT-943
A primary trainer derived fron 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.

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