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Information 
Bulletin
Sheet

Cierva CR Twin
Five Seat, Twin Engined Light Helicopter

Additional Technical Data


Rotor System

Number of rotors and configuration:- Two contra-rotating co-axial rotors interlinked with patented transfer linkage.
Number of blades:- Two in each rotor.
Blade Section:- NACA 00 (symmetrical) series, mean chord 8 in. (20.3 cm) tapered.
Blade attachment to hub:- Rigid (see-saw hubs)
Rotor structure:- Steel hubs. Plastic blades with stainless steel leading edge erosion protection.
Rotor brake:- Fitted.

Rotor Drive

Type of drive:- Spiral bevel gearbox (single stage only)
Rotor/engine r.p.m. ratio:- 7:50 (TSIO-360-A engine)
                            9:50 ('Tiara' T6-320 engine)

Structure
Fuselage:- Aluminium-alloy sheet-metal platform and glass reinforced plastics shell, (including canopy).
Tail cone:- Glass-reinforced plastic 

Landing Gear: Tubular steel skids. Two pneumatic handling wheels. Track 6 ft. 8 ins (2.03 m)