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Firestone XR-14

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XR-14
Role	Utility helicopter Type of aircraft
National origin	United States
Manufacturer	Firestone Aircraft Company
Status	Cancelled
Primary user	United States Army Air Forces
Developed from	Firestone XR-9

TheFirestone XR-14 was a proposed 1940sAmerican lightweighthelicopter, designed by theFirestone Aircraft Company to operate in theliaison andobservation helicopter for theUnited States Army Air Forces. Due to changing requirements no examples of the type were built.^[1]

Design and development

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Three Firestone Model GA-50 helicopters were ordered by the United States Army Air Forces for evaluation in the liaison and observation roles, competing against theBell XR-15 for a production contract. Derived from theModel GA-45 (XR-9) helicopter, the XR-14 was intended to be a four-seat aircraft, powered by aContinental A100 four-cylinderopposed piston engine; unconventionally, the XR-14 was intended to be equipped with twotail rotors. Prior to any of the aircraft being converted, however, the Army cancelled the contract; while Firestone attempted to market the GA-50 on the civilian market, no interest was forthcoming and the project was abandoned.^[2]

References

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Notes

^Andrade 1979, p. 162
^Merrian 2002, p. 64

Bibliography

Andrade, John (1979).U.S. Military Aircraft Designations and Serials since 1909. Hinckley, Leicastershire, UK: Midland Counties Publications. p. 171.ISBN 0-904597-22-9.
Merriam, Ray (2002).World War II Journal #15: U. S. Warplanes of World War II, Volume 1. Bennington, Vermont: Merriam Press. p. 64.ISBN 1-57638-167-6. Retrieved10 November 2011.

United Stateshelicopter designations, Army/Air Force andTri-Service systems

Numerical sequence used by USAAC/USAAF/USAF 1941–present;U.S. Army 1948–1956 and 1962–present;U.S. Navy 1962–present

Army/Air Force sequence
(1941–1962)

Prefix R-, 1941–1948	R-1 R-2 R-3 R-4 R-5 R-6 R-7 R-8 R-9 R-10 R-11 R-12 R-13 R-14 R-15 R-16
Prefix H-, 1948–1962	H-5 H-6 H-9 H-10 H-11 H-12 H-13 H-13J H-15 H-16 H-17 H-18 H-19 H-20 H-21 H-22 H-23 H-24 H-25 H-26 H-27 H-28 H-29 H-30 H-31 H-32 H-33 H-34 H-35 H-36¹ H-37 H-38¹ H-39 H-40 H-41 H-42 H-43 H-44¹ H-45¹

Tri-Service sequence
(1962–present)

1962 redesignations	H-13 H-13F H-13J H-19 H-21 H-23 H-25 H-34 H-37 H-43
New designations	H-46 H-47 H-48 H-49 H-50 H-51 H-52 H-53 CH-53/E/K HH-53/MH-53 H-54 H-55 H-56 H-57 H-58 H-59 H-60 UH-60 SH-60 HH-60 MH-60 H-61 H-62 H-63 H-64 H-65 H-66² RAH-66 TH-66 H-67 H-68 H-69¹ H-70 H-71 H-72 H-73
Alternate sequence	H-1 AH-1/J/T/W/Z UH-1/N/Y H-2 H-2G H-3 CH-3/HH-3 SH-3 H-4 H-5 H-6 AH-6 MH-6 OH-6
Non-sequential	H-90 H-92 CH-92/VH-92 H-139

¹ Not assigned • ² Assigned to multiple types

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References