XR-11/XH-11

Role	Twin-rotor helicopter Type of aircraft
National origin	United States
Manufacturer	Rotorcraft Corporation
Designer	Gilbert Magill
First flight	1947
Status	Cancelled
Primary user	U.S. Army Air Force
Number built	1

The Rotorcraft XR-11, known by the company as the X-2 Dragonfly, was an American two-seat lightweight helicopter built in the 1940s for evaluation by the United States Air Force by the Rotorcraft Corporation of Glendale, California.^[1]^[2]

Design and development

The XR-11 was a powered by a 100 hp (75 kW) Continental A100 piston engine driving two three-bladed contra-rotating rotors.^[1] Only one was built and first flown in 1947, it was re-designated the XH-11 in 1948, the project was later cancelled.^[1]^[2]

Variants

XR-11: United States Air Force designation later changed to XH-11, one built.^[1]

Operators

United States

United States Air Force

Specifications

General characteristics

Crew: 2
Length: 15 ft 0 in (4.57 m)
Height: 7 ft 6 in (2.29 m)
Empty weight: 899 lb (408 kg)
Max takeoff weight: 1,349 lb (612 kg)
Powerplant: 1 × Continental A100 , 100 hp (75 kW)
Main rotor diameter: 2 × 18 ft 0 in (5.49 m)

References

Notes

^ ^a ^b ^c ^d Andrade 1979, p. 162
^ ^a ^b "American airplanes - Ro - Ry". www.aerofiles.com. 25 February 2009. Retrieved 2010-02-18.

Bibliography

Wikimedia Commons has media related to Rotorcraft XR-11.

Andrade, John (1979). U.S.Military Aircraft Designations and Serials since 1909. Midland Counties Publications. ISBN 0-904597-22-9.

United States helicopter designations, Army/Air Force and Tri-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 J 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 F J 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-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 G 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