Movatterモバイル変換

Stearman Cloudboy

From Wikipedia, the free encyclopedia

1930s American trainer aircraft

Model 6 Cloudboy
The YBT-3
General information
Type	Training biplane
Manufacturer	Stearman Aircraft Company
Primary user	United States Army Air Corps
Number built	7
History
Manufactured	1930-1931
First flight	1931

TheStearman Model 6 Cloudboy was a 1930sAmerican training biplane designed and built by theStearman Aircraft Company of Wichita, Kansas.

History

[edit]

The Cloudboy was designed as a commercial or military trainer. Due to economic pressure during theGreat Depression, only a few aircraft were built.Three civil models were built, followed by four similar aircraft for evaluation by theUnited States Army Air Corps. DesignatedYPT-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).^[1]

Variants

[edit]

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

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 YPT-9 re-engined with a 300 hp (220 kW)Wright J-6-9 Whirlwind, later converted to a YPT-9C.
YBT-5: One YPT-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 atWright 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: United States Army Air Corps

Surviving aircraft

[edit]

6002 – 6L airworthy at theCandler Field Museum inWilliamson, Georgia.^[2]^[3]
6003 – 6L airworthy at theWestern Antique Aeroplane & Automobile Museum inHood River, Oregon.^[4] It was previously owned by the Golden Wings Flying Museum.^[5]
6004 – YPT-9B on display at theYanks Air Museum inChino, California. It was previously owned by the Boeing School of Aeronautics and was acquired by the museum in 1987.^[6]^[7]
6010 – 6C airworthy with Robert Lock ofLakeland, Florida.^[8]

Specifications (YPT-9B)

[edit]

Data from United States Military Aircraft since 1909^[9]

General characteristics

Crew: 2
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 sq ft (25.3 m²)
Gross weight: 2,814 lb (1,279 kg)
Powerplant: 1 ×Lycoming R-680-3 , 200 hp (149 kW)

Performance

Maximum speed: 135 mph (217 km/h, 117 kn)
Range: 490 mi (789 km, 430 nmi)
Service ceiling: 17,000 ft (5,183 m)
Rate of climb: 1,050 ft/min (5.3 m/s)

Notes

[edit]

^Phillips, Edward (2006).Stearman Aircraft: A Detailed History. North Branch, MN: specialtypress. pp. 95, 97,106–108.ISBN 9781580070874.
^"Museum".Peach State Aerodrome. Archived fromthe original on 31 July 2018. Retrieved25 November 2018.
^"FAA REGISTRY [N787H]".Federal Aviation Administration. U.S. Department of Transportation. Archived fromthe original on 25 November 2018. Retrieved25 November 2018.
^"FAA REGISTRY [N788H]".Federal Aviation Administration. U.S. Department of Transportation. Archived fromthe original on 25 November 2018. Retrieved25 November 2018.
^"1930 Stearman Cloudboy L-6 / YPT-9".Golden Wings Flying Museum. Retrieved25 November 2018.
^"Stearman YPT-9B Cloudboy".Yanks Air Museum. Archived fromthe original on 26 November 2018. Retrieved25 November 2018.
^"FAA REGISTRY [N795H]".Federal Aviation Administration. U.S. Department of Transportation. Archived fromthe original on 25 November 2018. Retrieved25 November 2018.
^"FAA REGISTRY [N786H]".Federal Aviation Administration. U.S. Department of Transportation. Archived fromthe original on 25 November 2018. Retrieved25 November 2018.
^Swanborough and Bowers 1963, p. 441.

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]

Wikimedia Commons has media related toStearman Cloudboy.

v t e Stearman Aircraft
Aircraft	C1 C2 C3 M-2 LT-1 CAB-1 4 5 6 X-70 73 75 76 80 81 Sportster X-85 X-90 X-91 X-100 X-120 200
Military designations	A-21 AT-15 BT-3 BT-5 BT-17 L-15 NS N2S OSS PT-9 PT-13 PT-17 PT-18 PT-27 XPT-943
Companies	Stearman Aircraft United Aircraft and Transport Corporation Boeing Spirit AeroSystems

United Statestrainer aircraft designations, Army/Air Force andTri-Service systems

Advanced trainer
(1925–1948)

Basic combat
(1936–1940)

Basic trainer
(1930–1948)

Primary trainer
(1924–1948)

Main sequence
(1948–present)

1948 redesignations	T-6 T-7 T-11 T-13² T-13A T-13B/D T-17 T-19
New designations	T-28 T-29 T-30 T-31 T-32 T-33 T-34 T-35 T-36 T-37 T-38 T-39 T-40 T-41² Grumman T-41 Cessna T-41 T-42 T-43 T-44 T-45 T-46 T-47² T-47A OT-47B T-48² YT-48 T-48TS T-49 T-50 T-51 T-52 T-53 T-54

Alternate sequences

1962 redesignations	T-1 T-2
Since 1990	T-1 T-2¹ T-3 T-4¹ T-5¹ T-6 T-7

¹ Not assigned • ² Assigned to multiple types

v t e Wright Field project numbers (1930–1934)
XP-900 XB-901 XP-902 XP-903 XP-904 905¹ XB-906 XB-907 XB-908 XC-909 XC-910 XO-911 XPT-912 XPT-913 XPT-914 XPT-915 916¹ XB-917 XC-918 919¹ XC-920 XB-921 922¹ XP-923 XO-924 XP-925 XO-926 XP-927 XC-928 XP-929 XPT-930 XPT-931 XO-932 XPT-933 XP-934 XBT-935 XP-936 XBT-937 XP-938 XO-939 XP-940 XC-941 XC-942 XPT-943 XP-944 XPT-945 946¹ 947¹ XP-948 949¹ XB-950
¹ Not assigned