Cessna Skymaster

336 Skymaster
337 Super Skymaster
A Cessna 337G Skymaster
Role Personal use and air taxi aircraft
Manufacturer Cessna
Reims Aviation
First flight 1961
Introduction 1962
Status Production completed
Primary user Private individuals and organizations
Produced 1963-1982
Number built 2,993[1]
Variants O-2 Skymaster
Conroy Stolifter
Spectrum SA-550
A rare 1964 Cessna 336 seen at Truckee Tahoe Airport in 2012. The fixed landing gear was later made retractable with the introduction of the 337.
Part of the contract fleet of Cessna 337 Skymasters on firefighting detection duty with the Ontario Ministry of Natural Resources at Dryden, Ontario, 1996.

The Cessna Skymaster is a United States twin-engine civil utility aircraft built in a push-pull configuration. Its engines are mounted in the nose and rear of its pod-style fuselage. Twin booms extend aft of the wings to the vertical stabilizers, with the rear engine between them. The horizontal stabilizer is aft of the pusher propeller, mounted between and connecting the two booms.[1] The combined tractor and pusher engines produce centerline thrust and a unique sound.[2]

Development

The first Skymaster, Model 336 Skymaster, had fixed landing gear and initially flew on February 28, 1961.[3][4] It went into production in May 1963[1] with 195 being produced through mid 1964.[2]

In February 1965, Cessna introduced the Model 337 Super Skymaster.[5] The model was larger, and had more powerful engines, retractable landing gear and a dorsal air scoop for the rear engine. (The "Super" prefix was subsequently dropped from the name.)[2] In 1966 the turbocharged T337 was introduced, and in 1973 the pressurized P337G entered production.[2]

Cessna built 2993 Skymasters of all variants, including 513 military O-2 versions.[1] Production in America ended in 1982, but was continued by Reims in France, with the FTB337 STOL and the military FTMA Milirole.[4]

Design

The Skymaster handles differently from a conventional twin-engine aircraft, primarily in that if an engine fails, the plane will not yaw toward that engine. Without the issue of differential thrust inherent to conventional (engine-on-wing) twins, engine failure on takeoff will not produce yaw from the runway heading. With no one-engine-out minimum controllable speed (Vmc), in-flight control at any flying speed with an engine inoperative is not as critical as it is with engines on the wing with the associated leverage; however, performance in speed and, particularly, rate of climb are affected. Flying a Skymaster requires a pilot to hold a multi-engine rating, although many countries issue a special "centerline thrust rating" for the Skymaster and other similarly configured aircraft.[2]

Ground handling requires certain attention and procedures. The rear engine tends to overheat and can quit while taxiing on very hot days.[6] There have been accidents when pilots, unaware of the shutdown, have attempted take-off on the nose engine alone, even though the single-engine take-off roll exceeded the particular runway length.[7] FAA Airworthiness Directive 77-08-05 prohibits single engine take-offs and requires the installation of a placard marked "DO NOT INITIATE SINGLE ENGINE TAKEOFF".[8]

The Skymaster's unique sound is made by its rear pusher propeller slicing through turbulent air from the front propeller and over the airframe while its front tractor propeller addresses undisturbed air.[2]

Operational history

From 1976 until the middle 1990s, the California Department of Forestry and Fire Protection used O-2 variants of the 337 Skymaster as tactical aircraft during firefighting operations. These were replaced with North American OV-10 Broncos, starting in 1993.[9]

Brothers to the Rescue

From 1991 until 2001 the Cuban exile group Hermanos al Rescate (Brothers to the Rescue) used Skymasters, among other aircraft, to fly search and rescue missions over the Florida Straits looking for rafters attempting to cross the Straits to defect from Cuba and, when they found them, dropped life-saving supplies to them. Rescues were coordinated with the US Coast Guard, who worked closely with the group. They chose Skymasters because their high wing offered better visibility of the waters below, they were reliable and easy to fly for long-duration missions (averaging 7 hours), and they added a margin of safety with twin engine centerline thrust. In 1996, two of the Brothers to the Rescue Skymasters were shot down by the Cuban Air Force (FAC) over international waters. Both aircraft were downed by a MiG-29, while a second jet fighter, a MiG-23 orbited nearby.[10]

Variants

Cessna

Cessna 337F Super Skymaster

Reims Cessna

Conversions/modifications

Military operators

 Burkina Faso 
Force Aérienne de Burkina Faso[15]
 Colombia
Colombian Air Force[16]
 Mozambique
Força Aérea de Moçambique (3 x FTB-337G) - ex-Portuguese Air Force FTB-337G refurbished and offered by the Government of Portugal to Mozambique in 2011 and 2012.[17]
 Nicaragua
[18]
 Togo
Togo Air Force[3]
 Zimbabwe
Air Force of Zimbabwe[3]

Former military operators

 Bangladesh
Bangladesh Air Force[19]
 Chile
Chilean Army Three examples, between the end of 1970s and mid-1990s, sold to civilian interests.
 Chad[3]
 Ecuador[3]
 El Salvador[3]
 Equatorial Guinea[20]
 Guinea-Bissau
Força Aérea de Guine-Bissau[21]
 Haiti
Haitian Air Force[3]
 Jamaica[3]
 Niger
Military of Niger[18]
 Mexico[3]
 Portugal
Portuguese Air Force[3] (32 × FTB-337G): Purchased in 1973 to replace the force's aging Dornier Do 27 fleet, which had been used intensively in the Portuguese Colonial War. The first 337 deliveries did not arrive until December 1974—after the end of the war. The last Skymaster in service with the Portuguese Air Force was retired on July 25, 2007.
 Sri Lanka
Sri Lanka Air Force[3]

Specifications (337D)

Data from Jane's All The World's Aircraft 1969–70[22]

General characteristics

Performance

See also

Related development
Aircraft of comparable role, configuration and era

References

  1. 1 2 3 4 Wood, Derek: Jane's World Aircraft Recognition Handbook, page 471. Jane's Publishing Company, 1985. ISBN 0-7106-0343-6
  2. 1 2 3 4 5 6 Plane and Pilot: 1978 Aircraft Directory, page 92. Werner & Werner Corp Publishing, 1978. ISBN 0-918312-00-0
  3. 1 2 3 4 5 6 7 8 9 10 11 12 13 Taylor, Michael: Encyclopedia of Modern Military Aircraft; page 67; Gallery Books; 1987; ISBN 0-8317-2808-6
  4. 1 2 3 4 5 6 Fitzsimons, Bernie: The Defenders - A Comprehensive Guide to the Warplanes of the USA, page 54. Gallery Books, 1988. ISBN 0-8317-2181-2
  5. ↑ Green, William: Observers Aircraft, page 46. Frederick Warne Publishing, 1974. ISBN 0-7232-1526-X
  6. ↑ McClellan, J Mac: Adam A500, Flying Magazine pages 52-58. Hachette Filipacchi Media U.S., December 2007. ISSN 0015-4806
  7. ↑ "NTSB Identification: CEN12FA058, 14 CFR Part 91: General Aviation". NTSB. November 10, 2011.
  8. ↑ "Airworthiness Directive 77-08-05". Federal Aviation Administration. April 28, 1977. Retrieved 2014-10-24.
  9. ↑ "CDF aviation management history". State of California. Retrieved 2015-07-04.
  10. ↑ University of Minnesota Human Rights Library (1999). "Armando Alejandre Jr., Carlos Costa, Mario de la Pena y Pablo Morales v. Republica de Cuba, Case 11.589, Report No. 86/99, OEA/Ser.L/V/II.106 Doc. 3 rev. at 586 (1999)". Retrieved 2007-12-07.
  11. ↑ Murphy, Daryl (2006). "The Cessnas that got away". Retrieved 2008-12-22.
  12. 1 2 Taylor 1969, pp. 304–305.
  13. ↑ Mitzar, Flying Pinto?
  14. ↑ The Spectrum SA-550
  15. ↑ Flight International 16–22 November 2004, p. 47.
  16. ↑ Flight International 16–22 November 2004, p. 52.
  17. ↑ Mais Alto June 2012, p. 16.
  18. 1 2 Flight International 16–22 November 2004, p. 77.
  19. ↑ Flight International 16–22 November 2004, p. 45.
  20. ↑ Flight International 16–22 November 2004, p. 56.
  21. ↑ Flight International 16–22 November 2004, p. 62.
  22. ↑ Taylor 1969, pp. 303–304.

External links

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