10-12 seat helicopter, constructed in United Kingdom under license from Sikorsky Aircraft Division of United Aircraft Corp, is sustained by single 3-blade main rotor, with 2-blade tail rotor; main rotor is driven, through clutch and freewheel, by Pratt and Whitney Wasp R.1340 engine developing 600 bhp for takeoff; later Alvis Leonides Major 800-hp engine will be available as alternative power plant.
Westland S.55 helicopter
Engineering
Engineering ; 175 , n 4539
1953
Aufsatz (Zeitschrift)
Englisch
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