Boeing-Stearman Model 75

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Model 75 (Stearman Kaydet)
Boeing Stearman N67193.jpg
Boeing Stearman N67193 in U.S. Navy markings
Role Biplane trainer
Manufacturer Stearman Aircraft / Boeing
Introduction 1934
Number built 8,584 (includes model 70, 75 and 76)[1]
Variants American Airmotive NA-75

The Stearman (Boeing) Model 75 is a biplane formerly used as a military trainer aircraft, of which at least 10,626 were built in the United States during the 1930s and 1940s.[2] 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 United States Army Air Forces, the United States Navy (as the NS and N2S), and with the Royal Canadian Air Force as the Kaydet throughout World War II. After the conflict was over, thousands of surplus aircraft were sold on the civilian market. In the immediate postwar years, they became popular as crop dusters and sports planes, and for aerobatic and wing walking use in air shows.

Design and development[edit]

A WAVE in a Boeing Stearman N2S United States Navy training aircraft
United States Navy N2S-2 at NAS Corpus Christi, 1943
United States Navy NS-1s of the NAS Pensacola Flight School, 1936
Boeing Stearman E75 (PT-13D) of 1944
Vintage Boeing-Stearman Model 75, Breitling SA
Boeing Stearman (PT-13D) of the TALOA in Dirgantara Mandala Museum, Indonesia
Boeing Stearman (PT-13) of the Israeli Air Force
United States Navy N2S ambulance at NAS Corpus Christi, 1942
Boeing Stearman PT-17, Museum of Historical Studies Institute of Aerospace in Perú - Lima
PT-17 "Kaydet" on display at the Museum of Aviation, Robins AFB
Boeing Stearman PT-17 Kaydet - Aeronautics Museum of Maracay

The Kaydet was a conventional biplane of rugged construction, with a large, fixed tailwheel undercarriage, and accommodation for the student and instructor in open cockpits in tandem. The radial engine was usually not cowled, although some Stearman operators choose to cowl the engine, most notably the Red Baron Stearman Squadron.

Operational history[edit]

Post-war usage[edit]

After World War II, thousands of surplus PT-17s were auctioned off to civilians and former military 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 Wasp Junior engine and a constant-speed propeller.

Variants[edit]

Data from:United States Navy aircraft since 1911,[3] Boeing aircraft since 1916[4] 8,584 model 70s, 75s and 76s were built, with additional "spares" bringing the number up to the sometimes quoted 10,346.[1]

USAAC/USAAF designations[edit]

The U.S. Army Air Forces model 75 Kaydet had three different designations, PT-13, PT-17 and PT-18, depending on which type of radial engine was installed.

PT-13
Initial production version with Lycoming R-680-B4B engine, 26 built in 1936
PT-13A Model A-75 with R-680-7 engine, 92 delivered from 1937 to 1938.
PT-13B R-680-11 engine, 255 delivered from 1939 to 1941.
PT-13C Six PT-13Bs modified for instrument flying.
PT-13D Model E-75 with R-680-17 engine, 793 delivered
PT-17
Version with Continental R-670-5 engine, 2,942 delivered.
PT-17A 136 PT-17s modified with blind-flying instrumentation.
PT-17B Three PT-17s modified with agricultural spraying equipment for pest control near army bases.
PT-17C Single PT-17 conversion with standardized Army-Navy equipment.
PT-18
Version with Jacobs R-755-7 engine, 150 built. Further production was cancelled as the engines were needed for other types of trainers.
PT-18A Six PT-18s modified with blind-flying instrumentation.
PT-27
USAAF paperwork designation given to 300 D75N1/PT-17 aircraft supplied under Lend-Lease to the Royal Canadian Air Force.

US Navy designations[edit]

NS
Up to 61 model 73B1 delivered, powered by 220 hp (160 kW) Wright J-5/R-790 Whirlwind radials[5]
N2S
Known colloquially as the "Yellow Peril" from its overall-yellow paint scheme.
N2S-1 model A75N1 with Continental R-670-14 engine, 250 delivered.
N2S-2 model B75 with Lycoming R-680-8 engine, 125 delivered in 1941.
N2S-3 model B75N1 with Continental R-670-4 engine, 1,875 delivered.
N2S-4 model A75N1 with Continental R-670-4 and -5 engines, 457 delivered of 579 ordered, including 99 PT-17s diverted from U.S. Army orders.
N2S-5 model E75 with Lycoming R-680-17 engine, 1,450 delivered.

Company designations[edit]

Stearman 70
Company designation for prototype, powered by 215 hp (160 kW) Lycoming radial engine, designated XPT-943 for evaluation[6]
Model 73
Initial production version, 61 built for U.S. Navy as NS plus export variants[5]
Model 73L3
Version for the Philippines, powered by 200 hp (150 kW) R-680-4 or R-680C1 engines, seven built[7]
Model A73B1
Seven aircraft for Cuban Air Force powered by 235 hp (175 kW) Wright R-790 Whirlwind, delivered 1939–1940[7]
Model A73L3
Improved version for the Philippines, three built[8]
Stearman 75
(or X75) Evaluated by the U.S. Army as a primary trainer, the X75L3 became the PT-13 prototype. Variants of the 75 formed the PT-17 family.
Stearman 76
Export trainer and armed version of the 75 with a gun ring and one or two fixed forward firing machine guns.
A76B4
5 built for Venezuela.
A76C3
15 built for Brazil.
B76C3
15 built with cameras for Brazil.
76D1
16 built for Argentina and three for Philippines as BT-1.
S76D1
seaplane version of 76D1 for Argentina
76D3
24 built for Philippine Constabulary as BT-1 armed advanced trainer, and 24 built for Cuba.

Other designations[edit]

Stearman XPT-943
Designation assigned to the X70 evaluated at Wright Field
Stearman Kaydet
Name used for aircraft in Royal Canadian Air Force service
American Airmotive NA-75
Single-seat agricultural conversion of Model 75, fitted with new, high-lift wings[9]

Operators[edit]

 Argentina
 Bolivia
 Brazil
Brazilian Air Force model A75L3 and 76.[13]
 Canada
Royal Canadian Air Force received 301 PT-27s under Lend Lease.[14]
 Republic of China
Republic of China Air Force received 150 PT-17s under Lend-Lease,[15] and 104 refurbished aircraft post war in Taiwan. The ROCAF used them until 1958.[16]
 Colombia
Colombian Air Force[12]
 Cuba
 Dominican Republic
 Greece
 Guatemala[17]
 Honduras
 Iran
Imperial Iranian Air Force[17]
 Israel
Israeli Air Force purchased 20 PT-17s.[18]
 Mexico
Mexican Air Force[17]
 Nicaragua
Nicaraguan Air Force[citation needed]
 Paraguay
Paraguayan Air Force[12]
 Peru
Peruvian Air Force[citation needed]
 Philippines
Philippine Army Air Corps[13]
Philippine Air Force[17]
 United States
United States Army Air Corps/United States Army Air Forces[13]
United States Marine Corps[citation needed]
United States Navy[13]
 Venezuela
Venezuelan Air Force[13]
 Yugoslavia
Yugoslav Air Force

Aircraft on Display / Surviving aircraft[edit]

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

 Argentina

 Australia

  • 75-6488 – B75N1 registered as VH-EYC, airworthy, owned by Steven Bradley, Southern Australia 5134[19]
  • 75-8314 – E75 Registered as VH-USE, airworthy, owned by Raalin, Western Australia 6208[20]

 Austria

 Brazil

 Canada

 Colombia

 Iceland

 Indonesia

 Israel

 Mexico

 Netherlands

 New Zealand

  • 75-647 – PT-17 Registered as ZK-RJS[47]
  • 75-2055 – PT-17 Registered as ZK-BWR[48]
  • 75-2100 – PT-17 Registered as ZK-KJO[49]
  • 75-2724 – PT-17 Registered as ZK-STM[50]
  • 75-3132 – PT-17 Registered as ZK-TGA[51]
  • 75-3655 – PT-17 Registered as ZK-USN[52]
  • 75-4245 – PT-17 Registered as ZK-PJS[53]
  • 75-5064 – PT-13D Registered as ZK-BOE[54]
  • 75-5907 – PT-13D Registered as ZK-XAF[55]
  • 75-8025A – N2S-3 Registered as ZK-USA[56]

 Peru

 Spain

  • PT-13 on display at the Fundación Infante de Orleans in Cuatro Vientos, Madrid.[57]
  • PT-17 on display at the Fundación Infante de Orleans in Cuatro Vientos, Madrid.[58]

  Switzerland

  • 75-5436 – PT-13D is airworthy, registered as HB-RBG, and based at the Fliegermuseum Altenrhein.[59] Built in 1943 and restored to airworthiness in 1989 after sustaining considerable damage during an emergency landing in the grounds of the Stadler Rail factory in Altenrhein due to engine failure.[60]

 Taiwan

 United States

Boeing-Stearman Kaydet at the Air Zoo
Boeing Stearman at the Cavanaugh Flight Museum

Specifications (PT-17)[edit]

Line drawings for the N2S/PT-13

Data from United States Military Aircraft since 1909[105]

General characteristics

  • Crew: 2
  • Length: 24 ft 9 in (7.54 m)
  • Wingspan: 32 ft 2 in (9.80 m)
  • Height: 9 ft 8 in (2.95 m)
  • Wing area: 298 sq ft (27.7 m2)
  • Empty weight: 1,931 lb (876 kg)
  • Max takeoff weight: 2,635 lb (1,195 kg)
  • Fuel capacity: 46 US gal (38 imp gal; 170 l)
  • Powerplant: 1 × Continental R-670-5 7-cylinder air-cooled radial piston engine, 220 hp (160 kW)
  • Propellers: 2-bladed fixed-pitch propeller

Performance

  • Maximum speed: 124 mph (200 km/h, 108 kn)
  • Cruise speed: 96 mph (154 km/h, 83 kn)
  • Service ceiling: 13,200 ft (4,000 m)
  • Time to altitude: 10,000 ft (3,000 m) in 17 minutes 18 seconds
  • Wing loading: 9.9 lb/sq ft (48 kg/m2)

In popular culture[edit]

An iconic movie image is a Stearman cropduster chasing Cary Grant across a field in North by Northwest (the airplane that chased Grant was actually a Naval Aircraft Factory N3N Canary; the plane that hits the truck is a Stearman).[citation needed] A heavily modified PT-17 variant was used as the Tornado in the Sonic The Hedgehog 2 Film.

See also[edit]

Aircraft of comparable role, configuration, and era

References[edit]

Notes[edit]

  1. ^ a b Bowers, 1989, p.255
  2. ^ National Museum of the United States Air Force gives the figure 10,346 but this includes the equivalent airframes in manufactured spare parts.
  3. ^ Bowers, Peter M.; Swanborough, Gordon (1990). United States Navy aircraft since 1911. Annapolis, Md.: Naval Institute Press. pp. 494–495. ISBN 0870217925.
  4. ^ Bowers, Peter M. (1989). Boeing aircraft since 1916 (3rd ed.). Annapolis: Naval Institute Press. pp. 251–269. ISBN 978-0870210372.
  5. ^ a b Bowers 1989, pp. 252–253.
  6. ^ Bowers 1989, pp. 251–252.
  7. ^ a b Bowers 1989, p. 253.
  8. ^ Bowers 1989, p. 254.
  9. ^ Taylor 1965, p. 178.
  10. ^ Bowers 1989, p. 268.
  11. ^ a b Núñez Padín, Jorge (2000). "BOEING STEARMAN N2S KAYDET". Fuerzas Navales (in Spanish). Jorge N. Padín. Archived from the original on 2014-05-17. Retrieved 2014-05-16.
  12. ^ a b c d e f Andrade 1979, p. 159
  13. ^ a b c d e Andrade 1979, p. 158
  14. ^ Bowers 1989, p. 265.
  15. ^ Bowers 1989, p. 262.
  16. ^ Bowers 1989, pp. 260–261.
  17. ^ a b c d e "Boeing-Stearman Kadyet". Military Factory. 2013-06-20. Retrieved 2014-05-17.
  18. ^ Nordeen 1991, p. 27.
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.

Bibliography[edit]

  • Andrade, John. U.S. Military Aircraft Designations and Serials since 1909, Midland Counties Publications, 1979, ISBN 0 904597 22 9
  • Avis, Jim and Bowman, Martin. Stearman: A Pictorial History. Motorbooks, 1997. ISBN 0-7603-0479-3.
  • Bowers, Peter M. Boeing Aircraft since 1916. London:Putnam, 1989. ISBN 0-85177-804-6.
  • Nordeen, Lon. Fighters Over Israel. London: Guild Publishing, 1991.
  • Phillips, Edward H. Stearman Aircraft: A Detailed History . Specialty Press, 2006. ISBN 1-58007-087-6.
  • Sapienza, Antonio Luis (May 2001). "L'aviation militare paraguayenne durant la seconde guerre mondiale" [Paraguayan Military Aviation During the Second World War]. Avions: Toute l'Aéronautique et son histoire (in French) (98): 30–33. ISSN 1243-8650.
  • Swanborough, F.G. and Peter M. Bowers. United States Military Aircraft since 1909. London: Putnam, 1963.
  • Taylor, John W. R. Jane's All The World's Aircraft 1965–66. London: Sampson Low, Marston & Company, 1965.
  • United States Air Force Museum. Wright-Patterson AFB, Ohio: Air Force Museum Foundation. 1975.

Videography[edit]

  • Stearman, Lloyd. Stearmans, You Gotta Love Them. Lap Records, 2005. (NTSC Format)

External links[edit]