Stearman Model 6 Cloudboy was a 1930s American training biplane designed and built by the Stearman Aircraft Company of Wichita, Kansas.
History [ edit ]
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 [ edit ]
Model 6L Stearman Cloudboy (YBT-9B), N787H
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).
One YPT-9 re-engined with a 165hp (123kW) Continental A7] (YR-545-1) engine, later converted to YPT-9B.
One YPT-9 and one YPT-9A re-engined with a 200hp (149kW) Lycoming R-680-3 engine.
YBT-3 re-engined with a 170hp (127kW) Kinner YR-720A engine.
One YBT-9 re-engined with a 300hp (224kW) Wright J-6-9 Whirlwind, later converted to a YPT-9C.
One YBT-9 re-engined with a 300hp (224kW)
Pratt & Whitney 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 [ edit ]
United States Army Air Corps
Specifications (YPT-9B) [ edit ]
Data from United States Military Aircraft since 1909 [3 ]
Length: 24 ft 8 in (7.52 m)
Wingspan: 32 ft 0 in (9.76 m)
Height: 9 ft 7 in (2.92 m)
Wing area: 272 ft 2 (25.3 m 2)
Gross weight: 2,814 lb (1,279 kg)
Powerplant: 1 × Lycoming R-680-3, 200 hp (149 kW) each
Maximum speed: 135 mph (217 km/h)
Range: 490 miles (789 km)
Service ceiling: 17,000 ft (5,183 m)
Rate of climb: 1,050 ft/min (5.3 m/s)
See also [ edit ]
References [ edit ]
Andrade, John (1979). U.S.Military Aircraft Designations and Serials since 1909. Midland Counties Publications. ISBN 0-904597-22-9.
Swanborough, F.G; Bowers, Peter M. (1963). United States Military Aircraft since 1909. London: Putnam.
Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions.
The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing. p. 2958.
External links [ edit ]