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Aviation History
1957
1957 - 1213.PDF
FLIGHT, 30 August 1957 301 I Powerplant Two Alvis Leonides MajorRotor diameter ... 48ft 6Jin Length (rotors folded) 54ft 2inGross weight ... 13,5001b. Photograph and drawing above show Type 173. PowerplantTwo Napier Gazelle Series 2 Rotor diameter ... 48ft 8inLength (rotors folded) 54ft 4in Gross weight ... 18,0001b.Cruising speed ... 138 m.p.h. Drawing and photograph of model below show Type 792. Britannia 250 Series These are military versions of the Britannia, production of which is the responsibility of Short Bros, and Harland, Ltd. Basically 310s, they differ notably in that special provision has been made for heavy freight, including a large forward door and strengthened "floating" floor. Three 252s have been ordered by the Government for trooping operations by private airlines, and thirteen 253s for R.A.F. Transport Command. Britannia IOO Fifteen of the early version of the Britannia, production of which hasceased, have been in service with B.O.A.C. since February 1 this year. Type 171 Sycamore As we go to press Bristol Aircraft, Ltd., announce that nearly 130 Sycamore single-rotor helicopters have been built and delivered and that nearly 50,000 flying hours have been logged by aircraft of the type in service with the Royal Air Force, the British Army, Royal Australian Navy, Royal Australian Air Force, Royal Belgian Air Force, German Armed Services (which placed an order for 50), British European Airways and Australian National Airways. A 4/5-seater, the Sycamore has an Alvis Leonides engine. Type 173 Impressive demonstrations by this type of twin-rotor helicopter will be re- membered from former S.B.A.C. Displays. The particular example illustrated on this page is the third prototype, which flew a few weeks after the former Display (November 9, 1956). It differs notably from its predecessors in being powered by two Alvis Leonides Major engines instead of single-row Leonides. The three Type 173s have been built under Ministry of Supply contract for intensive research into "military and civil applications of the multi- engine configuration." Type 192 Shown in model form below, the Type 192 helicopter will be fitted with two Napier Gazelle Series 2 gas turbine engines, each of 1,300 s.h.p., and will be supplied in quantity to the Royal Air Force for troop and freight transport, ambulance duties, and search and rescue operations. Operating as an ambulance, the 192 will carry 12 stretcher cases, three sitting wounded and a medical attendant. In the search-and-rescue role it will take ten or more rescued persons; and as a freighter it will lift a maximum distributed load of 6,000 lb.
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