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Aviation History
1959
1959 - 1287.PDF
May 1959 BRISTOL 182 JRiSTOL SYCAMORE HELICOPTER RELIABILITY Outstanding performance, economical maintenance of Bristol helicopters rooted in Bristol rotor and transmission design High utilisation, low maintenance costs, long operational life, combined with excellent control characteristics. These qualities have been amply demonstrated in world-wide operations of the Sycamore; and are now extended into the twin-rotor field by the Bristol 192. They are largely due to the mechanical simplicity and reliability of the Bristol rotor-head and power transmission system. Bristol rotor-head design The Bristol rotor-head is unusually simple, light and compact. Blades are connected to drag links by torsional tie-rods, thus avoiding large thrust bearings, cutting weight, and ensuring light control forces. Spider system of flying controls results in built-in feathering and simpler linkage to pilot's controls. Sycamore's low maintenance costs All Sycamore rotor-head components have unlimited mili- tary life; only four are retirable even in civil use. All power transmission components, too, have unlimited life, except the main drive shaft, and the main drive couplings in civil use (in military service, life is unlimited). For other components, maintenance man hours naturally vary with workshop techniques; but due to the Bristol transmission's robustness and essential simplicity, they are outstandingly low by helicopter standards. BRISTOL Helicopters BRISTOL AIRCRAFT LIMITED
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