Stearman Cloudboy

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Model 6 Cloudboy
Type	Training biplane
Manufacturer	Stearman Aircraft Company
Maiden 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.

[edit] Development

The Cloudboy was designed as a commercial or military trainer. It was a two-seat biplane with tandem open-cockpits and powered by nose-mounted 165hp (123kW) Wright J-6 engine. It had a fixed tailwheel landing gear. The aircraft was only built in small numbers due to the American economic climate in the early 1930s. Three civil aircraft were built followed by four similar aircraft for evaluation by the United States Army Air Corps. Designated the YPT-9 by the Army it failed to gain any orders. With only a few aircraft built they all went through a number of engine changes resulting in new designations for both the military and civil aircraft.

[edit] Variants

Model 6A Cloudboy

Initial civil production with a 165hp (123kW) Wright J-6 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 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-9B 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 and fitted with an enclosed canopy, later converted to a YPT-9C.

YBT-5

One YBT-9 re-engined with a 300hp (224kW) Pratt & Whitney Wasp Junior engine.

[edit] Operators

 United States

United States Army Air Corps

[edit] Specifications (YBT-9)

General characteristics

• Crew: 2
• Length: 24 ft 8 in (7.52 m)
• Wingspan: 32 ft 0 in (9.76 m)
• Powerplant: 1 × Wright J-6, 165 hp (123 kW)

Performance

• Maximum speed: 110 mph (177 km/h)
• Range: 350 miles (563 km)

[edit] See also

Related lists

• List of military aircraft of the United States
  

[edit] References

• Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. 
• The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing, 2958. 
• Andrade (1979). U.S.Military Aircraft Designations and Serials since 1909. Midland Counties Publications. ISBN ISBN 0 904597 22 9. 

[edit] External links

• Aerofiles - Stearman

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