Boeing-Stearman Model 75

Boeing-Stearman Model 75
Boeing PT-17 Stearman
Type:	Trainer aircraft
Design country:	United States
Manufacturer:	Boeing
First flight:	November 26, 1934
Commissioning:	1936
Production time:	1936 to 1944
Number of pieces:	8584

The Boeing-Stearman Model 75 is a biplane - trainer aircraft of the US aircraft manufacturer Boeing Stearman .

Design and purpose

The Boeing Stearman is one of the best-known and most-built double-deckers, over 8,500 units were produced from 1934. The US Army Air Corps used them with the designations PT-13 , PT-17 and PT-18 Kaydet as training aircraft. In the United States Navy it was referred to as N2S . From 1942, 300 units of the PT-27 were delivered to the Royal Canadian Air Force , 150 units of the PT-17 went to China (including a license for reproduction) and a total of around 50 to Brazil, Dominican Republic, Guatemala, Cuba and Venezuela. According to Boeing, 8,584 machines were produced and a further 2,000 in the form of spare parts.

After 1945, 2,100 machines were used as spray planes in agriculture. For this purpose, the wings were covered with aluminum, as the chemicals would have attacked the fabric covering. As a result, these aircraft were equipped with better engines.

Super stearman

The Super Stearman is the sport version of this aircraft.

In contrast to the classic version, it has a bonnet, red and white paintwork and has four ailerons . The Super Stearman became known as an acrobatics star at many air shows.

Versions

Boeing PT-13D in Zeltweg , 2009

The FAA lists the following versions in the associated civil code sheet A-743:

• A75L3: Lycoming radial engine of type R-680-B4C, -B4D or -B4E
• 75: ( Army PT-1) Lycoming radial engine type R-680-B4C, -B4D or -B4E
• B75: (Navy N2S-5) Lycoming radial engine of type R-680-B4C, -B4D or -B4E
• E75: (Army PT-13D, Navy N2S-5, PT-13D / N2S-5) Lycoming radial engine of the type R-680-B4C, -B4D or -B4E
• A75J1: (Army PT-18) Jacobs R-755-7 radial engine
• A75L300: Modification of the 75 versions to the Lycoming radial engines Lycoming B680-E3, -E3A or Lycoming R680-E3B
• A75N1: (Army PT-17, -17A; Navy N2S-1, -4) Continental radial engines W-670-6A or -6N
• B75N1: (Navy N2S-3) Continental radial engines W-670-6A or -6N
• D75N1: (Army PT-27) The name for the B75N1 for the Army.
• IB75A: Pratt & Whitney radial engine T1B-3 (R-985-AN1 or -AN-3)
• E75N1: (This information can be found on the nameplate, but corresponds to the E75 (Army PT-13D, Navy N2S-5 or PT-13D / N2S-5))

The USAAF used the following versions:

• PT-13 : air-cooled nine- cylinder radial engine type Lycoming R-680 , 2,141 were built.
  • PT-13 : R-680-B4B engine, 26 were built (Boeing Model 75).
  • PT-13A : R-680-7 engine, 92 were built in 1937/38.
  • PT-13B : R-680-11 engine, 255 were built in 1939/40.
  • PT-13C : Equipment of six PT-13B for instrument flight training.
  • PT-13D : PT-13A with R-680-17 engine, 353 were built.

PT-17 during wingwalking at Aero Friedrichshafen 2009

• PT-17 : air-cooled seven-cylinder star engine type Continental R-670-5 , 3,519 were built.
  • PT-17A : Equipment of 18 PT-17s for instrument flight.
  • PT-17B : conversion of three PT-17 to spray aircraft.
• PT-18 : PT-13 with Jacobs R-755 engine, 150 were built.
  • PT-18A : Equipment of six PT-18s for blind flight training.
• PT-27 : Name for 300 PT-17s delivered to the RCAF as part of the loan and lease agreement .

NS-1 of the US Navy 1936

The US Navy used the following versions:

• NS-1 : 220 PS (164 kW): air-cooled nine-cylinder radial engine type Wright J-5 Whirlwind , 61 were built (Boeing Model 73)
• N2S-1 : R-670-14 engine, 250 were built.
• N2S-2 : R-680-8 engine, 125 were built.
• N2S-3 : R-670-4 engine, 1,875 were built.
• N2S-4 : 577 were built, including 99 USAAF PT-17s with R-670-5 engines.
• N2S-5 : R-680-17 engine, 1,450 were built.

production

Acceptance of the Stearman Kaydet by the USAAF and the US Navy 1940 to 1945:

version	1940	1941	1942	1943	1944	1945	TOTAL
PT-13B, PT-17, N2S-3	376	1523					1899
PT-18	98	52					150
N2S-1	114	136					250
N2S-2		125					125
N2S-3		225					225
PT-17, N2S-3, N2S-4			1917	1655			3572
PT-27			300				300
PT-13D, N2S-5				988	708	72	1768
TOTAL	588	2061	2217	2643	708	72	8289

The USAAF took over the approval of the Kaydet for the Navy in the course of 1941, so that the aircraft in question were collected under the USAAF designation. The number of PT-13 / PT-17 includes a small number of export models. Before 1940, 295 Stearman Kaydet were built.

Technical specifications

Parameter	Data
crew	1 + 1
length	7.63 m
span	9.8 m
height	2.8 m
Empty mass	880 kg
Max. Takeoff mass	1230 kg
Top speed	200 km / h
Range	480 km
Original engine	a Continental R-670 with 220 PS (162 kW)

Incidents

During the period of use of this aircraft model, there have been 852 accidents with a total of 207 deaths.

Web links

Commons : Boeing Stearman  - collection of images, videos and audio files

• Official Kaydet page of Boeing
• US National Museum of Naval Aviation site facing N2S
• USAF Museum Factsheet on the Stearman PT-13D Kaydet
• Boeing Stearman: photos, history, anecdotes, facts
• Boeing Stearman N2S-3 on the website of the Quax - Association for the promotion of historical aircraft. V.

Individual evidence

1. ↑ FAA: FAA Type Certificate A-743. In: faa.gov. FAA, October 15, 1987, accessed May 2, 2019 . 
2. ↑ Statistical Digest of the USAF 1946. pp. 100 ff .; www.uswarplanes.net; Phillips, Edward H .: Stearman Aircraft. A Detailed History, North Branch 2006, pp. 201 f.
3. ↑ Accidents with the Boeing-Stearman , Aviation Safety Network WikiBase , accessed on March 10, 2019