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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)