Kamov Ka-22
Ka-22 | |
---|---|
Role | Transport Gyrodyne |
National origin | Soviet Union |
Manufacturer | Kamov |
Designer | Vladimir Barshevsky |
First flight | 15 August 1959 |
Retired | 12 August 1964 |
Number built | 4 |
The Kamov Ka-22 Vintokryl (rotor-wing, or literally, (air)screw-wing) (
Development
In order to increase the effective range of a helicopter, Kamov designer Vladimir Barshevsky drew up a design for a helicopter with wings and an aeroplane propulsive system. In 1954 a proposal was agreed to produce three Ka-22s. The programme was delayed and on 28 March 1956 prototypes 2 and 3 were cancelled. The Ka-22 first lifted from the ground on 17 June 1959, and made its first untethered flight on 15 August 1959. Serious control difficulties were encountered, leading to orders being postponed until the problems were solved, and in July 1960 an order was received to manufacture three more Ka-22s.
Design
The Ka-22 was in essence a fixed-wing aircraft with rotors fitted above the wing tips. An engine was mounted on each wing tip, with drive to both a four-bladed tractor propeller and a four-bladed main rotor. The original prototype was powered by 5,900shp
Operational history
During its short operational history, a total of eight
On 28 August 1962, while on an intermediate stop during a ferry flight to Moscow for acceptance testing, Ka-22 01-01 rolled to the left and crashed inverted, killing the entire crew. The cause was found to be the starboard rotor collective pitch control linkage, and further inspection found that two of the other three Ka-22s suffered from similar problems.[4] Subsequently, in order to improve stability and control, a complex differential autopilot was installed. This sensed attitude and angular accelerations, and fed into the control system.
On 12 August 1964, while involved in
After this, the Ka-22 was abandoned, with the
Specifications (Ka-22)
Data from [4]
General characteristics
- Capacity: 100 passengers
- Length: 27 m (88 ft 7 in)
- Wingspan: 22.5 m (73 ft 10 in) fixed wing
- Wing area: 105 m2 (1,130 sq ft)
- Empty weight: 28,200 kg (62,170 lb)
- Gross weight: 35,500 kg (78,264 lb) VTO
- Max takeoff weight: 42,500 kg (93,696 lb) STO
- Powerplant: 2 × Soloviev D-25VKturboshaft engines, 4,045 kW (5,424 hp) each
- Main rotor diameter: 2 × 20 m (65 ft 7 in)
- Main rotor area: 795.2 m2 (8,559 sq ft) total
- Propellers: 4-bladed Variable-pitch propellers
Performance
- Maximum speed: 375 km/h (233 mph, 202 kn)
- Range: 450 km (280 mi, 240 nmi)
- Service ceiling: 5,500 m (18,000 ft)
See also
Aircraft of comparable role, configuration, and era
Related lists
References
Notes
- ^ a b Jane's all the World's Aircraft 1963-1964 - Link p.300
- ^ "Helicopter Ka-22." Kamov Company. Retrieved: 5 June 2008.
- ^ "World Records." Kamov Company. Retrieved: 5 June 2008.
- ^ ISBN 978-1-85780-099-9.
- ^ Apostolo 1984, p. 109.
Bibliography
- Apostolo, Giorgio. The Illustrated Encyclopedia of Helicopters. New York: Bonanza Books, 1984. ISBN 0-517-439352.
- Everett-Heath, John. Soviet Helicopters: Design, Development and Tactics. Coulsdon, UK: 1988 (2nd Revised Ed.) ISBN 0-7106-0572-2
- ISBN 1-85532-405-9.