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Aviation History
1956
1956 - 1227.PDF
TH SHORT BROTHERS AND HARLAND, LTD. Seaplane Works, Queen's Island, Belfast. Telephone: Belfast 58444 PowerpUnt ... AnmtroBg Sid- deley Mamba ASM.6 Span 55ft Length 41ft Typical gross weight (A.S.I) 13,884 lb Max. speed 242m.ph. Seamew. As supplied to the Fleet Air Arm of the Royal Navy the Seamew turboprop- powered light anti-submarine aircraft is designated A.S.I; for RAF. Coastal Command its name carries the suffix M.R.2. This unique aeroplane stems from Naval Staff deliberations in 1951, which concluded that there was a need for a simple, yet fully effective, light aircraft for anti-submarine duties. Take-off performance in a 12 kt wind is 500ft and even in still air it is only 300 yd. The total stores load is in excess of 1,800 lb, with some stores carried on the wings and some internally, and several combinations are possible, including mines, sonobuoys and torpedoes. The normal level speed of the aircraft is about 200 kt, but it is cleared to the relatively high diving speed of 325 kt; this is to enable attacks to be made from altitude by diving on the enemy. The speed range between stalling speed and diving speed is unusually large for an aircraft of this type. The forward position of the radar scanner ensures that, even in a steep dive, the target is always in the radar view and never blanked by the nose of the aircraft. Alternative weapons loads of the Seamew A.S.I, in its present form, are: four 275 lb anti-submarine bombs; two 275 lb A/S. bombs, four R.P.s and eight 28 lb sonobuoys; or 20 sonobuoys and six R.P.S. With an enlarged (17ft) weapons bay and fuel for a three-hour patrol, it is possible to carry six 275 lb A/S. bombs and three R.P.s, or one 2,000 lb "weapon" (this may be assumed to be a form of homing torpedo); or 28 sonobuoys and six R.P.S. No gun armament is carried for anti-submarine duties. The ASV radar is fully incorporated, with a rotating scanner housed within a prominent radome under the forward fuselage. With the exception of the indicator and the control unit, the whole of the gear is accommodated in a hinged bay for easy access. Other equipment includes VHF radio telephone, H.F./T.R. voice equipment, intercommunication equipment, low-level radio altimeter and a pilot-interpreted short-range navigational aid. P.D.ll. This very important vertical-take-off prototype is being built at Belfast to the order of the Ministry of Supply. No other details are available. Seamew with folded wings
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