- Aircraft History, Specification and Information -
Boeing-Stearman Model 75
Boeing Stearman A75N1 (PT17) N56878
1943 Boeing Stearman A75N1 (PT17)
N56878 (sn 75-1712)
Photo taken July 2010 @ Oshkosh (EAA AirVenture Fly-in), WI - USA (OSH / KOSH)
Photo © Marcel Siegenthaler

The Stearman (Boeing) Model 75 is a biplane, of which at least 9,783 were built in the United States during the 1930s and 1940s as a military trainer aircraft. Stearman Aircraft became a subsidiary of Boeing in 1934. Widely known as the Stearman, Boeing Stearman or Kaydet, it served as a primary trainer for the USAAF, as a basic trainer for the USN (as the NS & N2S), and with the RCAF as the Kaydet throughout World War II. After the conflict was over, thousands of surplus aircraft were sold on the civil market. In the immediate post-war years they became popular as crop dusters and as sports planes.

Design and development

The Kaydet was a conventional biplane of rugged construction with large, fixed tailwheel undercarriage, and accommodation for the student and instructor in open cockpits in tandem. The radial engine was usually uncowled, although some Stearman operators choose to cowl the engine, most notably the Red Baron Stearman Squadron.

Operational history

Post-War usage
After World War II, the thousands of PT-17 Stearmans were auctioned off to civilians and former pilots. Many were modified for cropdusting use, with a hopper for pesticide or fertilizer fitted in place of the front cockpit. Additional equipment included pumps, spray bars, and nozzles mounted below the lower wings. A popular approved modification to increase the maximum takeoff weight and climb performance involved fitting a larger Pratt & Whitney R-985 engine and a constant speed propeller.

Variants

The US Army Air Forces Kaydet had three different designations based on its power plant:

  • PT-13, with a Lycoming R-680 engine. 2,141 total all models.
    • PT-13 Initial production. R-680-B4B engine. 26 built. Boeing Model 75.
    • PT-13A R-680-7 engine. 92 delivered 1937-38. Model A-75.
    • PT-13B R-680-11 engine. 255 delivered 1939-40.
    • PT-13C Six PT-13Bs modified for instrument flying.
    • PT-13D PT-13As equipped with the R-680-17 engine. 353 delivered.
  • PT-17 with a Continental R-670-5 engine. 3,519 delivered
    • PT-17A 18 PT-17s were equipped with blind-flying instrumention.
    • PT-17B Three PT-17s were equipped with agricultural spraying equipment for pest-control.
  • PT-18 PT-13 with a Jacobs R-755 engine, 150 built.
    • PT-18A Six PT-18s fitted with blind-flying instrumention.
  • PT-27 Canadian PT-17. This designation was given to 300 aircraft supplied under Lend-Lease to the RCAF.

The US Navy had several versions including:

  • NS-1 Up to 61 delivered. powered by surplus 220 hp (164 kW) Wright J-5 Whirlwind. Model 73.
  • N2S Known colloquially as the "Yellow Peril" from its overall-yellow paint scheme.
  • N2S-1 R-670-14 engine. 250 delivered to the US Navy.
  • N2S-2 R-680-8 engine. 125 delivered to the US Navy.
  • N2S-3 R-670-4 engine. 1,875 delivered to the US Navy.
  • N2S-4 99 US Army aircraft were diverted to the US Navy, plus 577 new aircraft were delivered to the US Navy.
  • N2S-5 R-680-17 engine. 1,450 delivered to the US Navy.

Operators

Argentina
Argentine Navy

Bolivia

Brazil

Canada
Royal Canadian Air Force

China
Taiwan Air Force (Nationalist China or Rep. of China Air Force)

Colombia

Cuba

Dominican Republic

Greece

Guatemala

Honduras

Iran
Imperial Iranian Air Force

Israel
Israeli Air Force

Mexico
Mexican Air Force

Philippines
Philippine Army Air Corps
Philippine Air Force

United States
US Army Air Corps/US Army Air Forces
US Marine Corps
United States Navy

Venezuela

Survivors

A considerable number of Stearmans remain in flying condition throughout the world, as the type remains a popular sport plane and warbird.

  • PT-13D (s/n 42-17800) is on display at the National Museum of the United States Air Force in Dayton, Ohio. This aircraft is the last Kaydet produced. It was donated in 1959 by the Boeing Aircraft Company, which purchased the Stearman Company in 1938.
  • PT - 17 (26) owned by British actor Martin Shaw flies from Old Buckenham airfield in Norfolk.
  • 75-3130 is on display in the hangar deck of the USS Yorktown (CV-10) at The Patriot's Point Naval and Maritime Museum in Charleston, SC.
  • The Canadian Warplane Heritage Museum near Hamilton, Ontario, is the owner and operator of a PT-17 built in 1942 running with a Continental W-670-6N engine.
  • A PT-17 in which George H.W. Bush once flew as part of his navy training is on display at the Pacific Aviation Museum, on Ford Island, Pearl Harbor.
  • Mexican Air Force at its Zapopan Air Base currently operates 4 PT-17, using them for parades.
  • TG Aviation based in Kent International Airport in Kent, UK also operate a Boeing Stearman, it can often be seen at local air shows.
  • Wild Blue Aviation Co. flies a restored PT-17 (#464) for aerobatic rides in Fayetteville, WV.
  • PT-17 on display Carolinas Aviation Museum, Charlotte, North Carolina.

Specifications (PT-17)

General characteristics
Crew: two, student and instructor
Length: 24 ft 9 in (7.54 m)
Wingspan: 32 ft 2 in (9.81 m)
Height: 9 ft 8 in (2.95 m)
Wing area: 298 sq ft (27.7 m²)
Empty weight: 1,931 lb (878 kg)
Max takeoff weight: 2,635 lb (1,198 kg)
Powerplant: 1× Continental R-670-5 seven-cylinder air-cooled radial engine, 220 hp (164 kW)

Performance
Maximum speed: 135 mph (117 knots, 217 km/h)
Cruise speed: 96 mph (83 knots, 155 km/h)
Service ceiling: 13,200 ft (4,024 m)
Climb to 10,000 ft (3,050 m): 17.3 min

Last updated September 09, 2010
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Boeing-Stearman Model 75".
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