Kellett KD-1

Kellett KD-1

Kellett XR-3 modification of YG-1B (KD-1) of U.S. Army preserved at Yanks Air Museum, Chino airfield California, in January 2008
Role	Autogyro
National origin	United States
Manufacturer	Kellett Autogiro Company
First flight	1934
Primary users	United States Army Air Forces Eastern Airlines
Variants	Kayaba Ka-1

The Kellett KD-1 was a 1930s American autogyro built by the Kellett Autogiro Company. It had the distinction of being the first practical rotary-wing aircraft used by the United States Army and inaugurated the first scheduled air-mail service using a rotary-wing aircraft.

Development

Using the experience gained in building Cierva autogyros under licence the Kellett Autogiro Company developed the KD-1 which was similar to the contemporary Cierva C.30. It had two open cockpits, a fixed tailwheel landing gear and was powered by a 225 hp (168 kW) Jacobs L-4 radial engine. After testing of the prototype a commercial variant designated the KD-1A was put into production. The KD-1A had a three-bladed rotor with folding blades and a number of minor detail improvements. A KD-1B which was a KD-1A with an enclosed cockpit for the pilot was operated by Eastern Airlines and inaugurated the first scheduled rotary-wing air-mail service on 6 July 1939.

In 1935 the United States Army bought a KD-1 for evaluation and designated it the YG-1, a second aircraft followed which had additional radio equipment and was designated the YG-1A. These two aircraft were followed by a batch of seven designated YG-1B. In 1942 seven more were bought for use in the observation role as the XO-60. Six XO-60s were re-engined with 300 hp (224 kW) Jacobs R-915-3s and re-designated YO-60.^[1] One YG-1B was modified with a constant-speed rotor and was re-designated the YG-1C, it was later re-engined with the more powerful R-915 and re-designated again as the XR-2. The XR-2 was destroyed by rotor ground resonance problems and the evaluation was continued with another modified YG-1B designated the XR-3.

Variants

YG-1 (KD-1) at Langley

KD-1: Prototype, one built
KD-1A: Commercial variant with open cockpit and a 225 hp (168 kW) Jacobs L-4 radial engine; three built.
KD-1B: Commercial variant with enclosed cockpit; two built.
YG-1: United States Army designation for one KD-1A acquired for evaluation.
YG-1A: One aircraft as YG-1 with the addition of radio equipment.

YG-1B at Langley

YG-1B: Production aircraft for the United States Army; seven built.
YG-1C: One YG-1B modified with a constant-speed rotor for evaluation, later designated the XR-2.

A Kellett XO-60

XO-60: Production aircraft for the United States Army with a 225 hp (168 kW) Jacobs R-755 radial engine, seven built.
YO-60: Six XO-60s re-engined with a 300 hp (220 kW) Jacob R-915-3 radial engine.
XR-2: The YG-1C re-designated after being re-engined with a 300 hp (220 kW) Jacobs R-915-3 radial engine.
XR-3: One YG-1B modified to XR-2 standard for evaluation.
Kayaba Ka-Go prototype: Prototype; it was an airframe which had repaired KD-1A by Kayaba.
Kayaba Ka-1: Imperial Japanese Army developed referring to KD-1A. Powered by a 240 hp (180 kW) Argus As 10 engine, airframe that changed engine of prototype.
Kayaba Ka-2: Imperial Japanese Army developed referring to KD-1A. Powered by a 245 hp (183 kW) Jacobs L-4MA-7 engine, airframe that changed engine of Ka-1 for the same thing as prototype.

Operators

United States

Specifications (KD-1B)

General characteristics

Crew: 2
Length: 28 ft 10 in (8.79 m)

Performance

References

Notes

↑ "ARMY AUTOGIRO" Popular Science, June 1944, photo of YO-60

Bibliography

Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions.
The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing.
Andrade, John (1979). U.S.Military Aircraft Designations and Serials since 1909. Midland Counties Publications. ISBN 0-904597-22-9.

External links

Media related to Kellett KD-1 at Wikimedia Commons

Aircraft produced by Kellett Autogiro Corporation

K-1 K-2 K-3 K-4 KD-1 KD-2 KD-10 KH-15 US military designations YG-1 YO-60 XR-2 XR-3 XR-8 XR-10

USAAC autogyro designations

G-1 G-2

United States helicopter designations, Army/Air Force and Tri-Service systems

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

Main 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

Main joint sequence
(1962–present)

1962 redesignations	OH-13/UH-13J UH-19 CH-21 OH-23 UH-25 CH-34 CH-37 HH-43

New designations	CH-46/HH-46/UH-46 CH-47 UH-48 XH-49 QH-50 XH-51 HH-52 CH-53/HH-53/MH-53/CH-53E/CH-53K CH-54 TH-55 AH-56 TH-57 OH-58 XH-59 UH-60/SH-60/HH-60/HH-60J YUH-61 XCH-62 YAH-63 AH-64 HH-65 RAH-66 TH-67 MH-68 H-69¹ ARH-70 VH-71 UH-72 H-73 to H-91¹ VH-92

1962 redesignations
reusing old numbers

¹ Not assigned

USAAC/USAAF observation aircraft

Observation	O-1 O-2 O-3 O-4 O-5 O-6 O-7 O-8 O-9 O-10 O-11 O-12 O-13 O-14 O-15 O-16 O-17 O-18 O-19 O-20 O-21 O-22 O-23 O-24 O-25 O-26 O-27 O-28 O-29 O-30 O-31 O-32 O-33 O-34 O-35 O-36 O-37 O-38 O-39 O-40 O-41 O-42 O-43 O-44 O-45 O-46 O-47 O-48 O-49 O-50 YO-51 O-52 O-53 O-54 O-55 O-56 O-57 O-58 O-59 O-60 O-61 O-62 O-63

Observation Amphibian	OA-1 OA-2 OA-3 OA-4 OA-5 OA-6 OA-7 OA-8 OA-9 OA-10 OA-11 OA-12 OA-13 OA-14 OA-15 SA-16

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