Boeing Model 81


Boeing Model 81
Model 81 / XN2B
Role trainer
National origin United States
Manufacturer Boeing
Introduction 1928
Primary user Boeing School
Number built 2
Developed from Boeing Model 64

The Boeing Model 81 was an American training aircraft built by Boeing in 1928. The Model 81 was a development of the Model 64. It was powered by a newly developed engine, the 125 hp Fairchild-Caminez 4-cylinder radial engine.[1] Operating at a much lower rpm than most engines (1000 rpm) it required the use of a large high-pitch propeller.[2]

After initial flight tests with the Fairchild-Caminez, the prototype was refitted with a 145 hp Axelson engine, redesignated Model 81A and delivered to the Boeing School of Aeronautics. There it was re-engined a number of times, first with a 115 hp Axelson engine, redesignated Model 81B. It then received a 165 hp Wright J-6-5, then a 100 hp Kinner K-5 and a redesigned vertical tail. Redesignated Model 81C, it would later be removed from training service, re-engined with an Axelson engine, and used as a classroom trainer.[3]

On 21 June 1928 the second Model 81 built was delivered to the US Navy at Anacostia, Maryland for $8,300, and redesignated Boeing XN2B. Its trial with the Fairchild engine was unsatisfactory, and on 10 January 1929 it was refitted by Wright Aeronautical with a 160 hp Wright J-6-5 engine. Despite increased performance, it was not ordered into production.[4]

Contents

Variants

81
Original Caminez-engined aircraft
81A
145 hp Axelson engine
81B
115 hp Axelson engine
81C
100 hp Kinner K-5, redesigned tail.
XN2B
US Navy designation.

Operators

 United States
  • Boeing School of Aeronautics

Specifications (XN2B)

Data from Bowers, 1989. p. 144

General characteristics

  • Crew: 2
  • Length: 25 ft 8 in (7.82 m)
  • Wingspan: 35 ft in (10.67 m)
  • Height: 11 ft 2 in (3.40 m)
  • Wing area: 259 ft2 (24.06 m2)
  • Empty weight: 1,652 lb (750 kg)
  • Gross weight: 2,178 lb (988 kg)
  • Powerplant: 1 × Fairchild-Caminez, 125 hp (93 kW) each

Performance

  • Maximum speed: 103.9 mph (167 km/h)
  • Cruise speed: 86 mph (138 km/h)
  • Range: 335 miles (539 km)
  • Service ceiling: 12,000 ft (3660 m)
  • Rate of climb: 515 ft/min (2.62 m/s)

References

  1. ^ A diagram of the 4-cylinder Fairchild-Caminez cam engine
  2. ^ Bowers, 1989, p. 142
  3. ^ Bowers, 1989, pp. 144-145
  4. ^ Bowers, 1989, pp. 142-144
  • Bowers, Peter M. Boeing aircraft since 1916. London: Putnam Aeronautical Books, 1989. ISBN 0-85177-804-6

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Boeing Model 40 — Boeing Model 40 …   Deutsch Wikipedia

  • Boeing Model 40 — Model 40A Boeing Model 40A Constructeur …   Wikipédia en Français

  • Boeing Model 80 — Boeing Model 80 …   Deutsch Wikipedia

  • Boeing Model C — Model C Boeing Model 3 Constructeur …   Wikipédia en Français

  • Boeing Model C — Saltar a navegación, búsqueda Boeing Model C Tipo entrenamiento Fabricante Boeing …   Wikipedia Español

  • Boeing Model 6D — Model 6D Constructeur Boeing Type Hydravion Premier vol avril 1928 …   Wikipédia en Français

  • Boeing Model 50 — Boeing PB 1 im Flug Das Boeing Model 50 (US Navy Bezeichnung: PB) Doppeldecker Flugboot sollte für den ersten Nonstop Flug nach Hawaii 1925 eingesetzt werden. Es wurde nur ein Exemplar gebaut. Die PB 1 war eine erweiterte Version der Naval… …   Deutsch Wikipedia

  • Boeing Model 6 — Model 6 Vue de l avion Constructeur …   Wikipédia en Français

  • Boeing Model 6 — Model 6 Boeing Model 6 в музее Сиэтла. Тип гидросамолёт общего назначения Производитель Boeing Главный конструктор …   Википедия

  • Boeing Model 40 — NOTOC infobox Aircraft name = Boeing Model 40 type = Mail plane manufacturer = Boeing caption = designer = first flight = 20 July 1925 introduced = 1 July 1927 retired = status = primary user = more users = produced = number built = ca. 80 unit… …   Wikipedia


We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.