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Aviation History
1954
1954 - 0665.PDF
FLIGHT, 12 March 1954 295 as "not less than 150 m.p.h." The still-air range is stated to be about 250 nautical miles, and die operating cost 3d per seat-mile at 100 nautical miles (utilization 2,500 hr p.a., 30 knot headwind, 25 min diversion). PERCIVAL P.74 • Now under construction for the Ministry of Supply, this eight-passenger helicopter is powered with a Napier high-efficiency, low-pressure, gas-propulsion system which is claimed to avoid all mechanical couplings between the source of power and the rotor. Air ducts feed up on each side of the cabin, the forward part of which has four forward-facing seats and the aft part four rearward-facing seats. The rotor has three blades and is rotated by tip-mounted jets. The makers state that the Model of S.E. Helibus. Russian helicopter (S-55 type). (Drawing above and picture right) Bell HSL-1. (Be/ow) Saunders-Roe project. elimination of the usual cooling arrangements and complicated transmission system will greatly reduce the maintenance and overhaul times. Another feature of die drive, they say, is that it is die quietest available, and they estimate that the noise level will be of the order of 90 decibels at a distance of 100ft and 70 decibels in the cabin. The gross weight is quoted as 7,750 lb and the cruising speed as 120 m.p.h. SAUNDERS-ROE PROJECT • In releasing the first artist's impressions of this aircraft last summer (one of these is repro duced on this page) Saunders-Roe, Ltd., gave litde information beyond what could be gathered visually. It will be seen that the design—to the requirements of British European Airways—is characterized by tandem rotors; small wing; tandem main undercarriage, with outrigger wheels beneath die wings; a hori zontal tailplane and a ten-blade pusher propeller at the stern. The diameter of the power plant exhausts, one of which is visible at each end of the aircraft, suggests gas-turbine power, and it will be noted that the rotor heads tre very cleanly faired in. Note also tiiat the rear loading door is large enough to admit a fair-size
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