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The Cierva CR Twin (originally designated CR LTH.1) was a five-seat utility helicopter that first flew in the UK in 1969. It was a joint development between Cierva and Rotorcraft, based on the dynamic systems of the latter company's Grasshopper design. A new, highly-streamlined pod-and-boom fuselage was married to the Grasshopper's coaxial counter-rotating rotor system, and the new aircraft registered G-AWRP first flew on 18 August 1969.
Two further prototypes followed, G-AXFM later in 1969 and G-AZAU in 1971, this latter example fitted with Continental IO-360-D engines in place of the Rolls-Royce Continental O-300 units of the first two machines. Financial backing could not be obtained for further development, and the project was abandoned by 1975. The first prototype is preserved at The Helicopter Museum in Weston-super-Mare.
[edit] Variants
- CR Twin - prototypes (3 built)
- CR.420 - proposed variant with Continental TSIO-360-A engines (not built)
- CR.640 - proposed variant with Continental Tiara T6-320 engines (not built)
[edit] Specifications
General characteristics
- Crew: One pilot
- Capacity: 4 passengers
- Length: 28 ft 2 in (8.58 m)
- Main rotor diameter: 33 ft 0 in (10.06 m)
- Main rotor area: 855 ft² (79.5 m²)
- Gross weight: 1,564 lb (709 kg)
- Powerplant: 2 × Rolls-Royce Continental O-300, 135 hp (101 kW) each
Performance
- Maximum speed: 138 mph (222 km/h)
[edit] References
- Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions, 255.
- Simpson, R. W. (1998). Airlife's Helicopters and Rotorcraft. Ramsbury: Airlife Publishing, 212.
[edit] See also
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