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Aviation History
1947
1947 - 0343.PDF
1947 RETAILS of a Rolls-Royce Nene turbo-jet unit installed in the starboard outer position on the Avro Lancas- trian are clearly revealed in this unique '' Flight'' drawing. The plenum chamber, which fits closely round the power unit, forms an inner shell to the nacelle. Many features of jet installation, such as the mounting structure, remote auxiliary drive arrangements, and the jet pipe relief duct, are shown for the first time. Detachable panels on the nacelle give ready access to all com- ponents needing inspection or service. nsco *OTOR COOLING AIR EXHAUST PIPE JET TUBE PRESSURE RELIEF OUTLET in effect a front bulkhead. There are five other formers for the cowling, two in front of the spar and three behind it. In addition, two long channel members divide the struc- ture horizontally on each side and carry fittings for the cowling fasteners. They are attached to the formers and to trunnions on the diffuser casing. The top inspection panels ahead of the leading edge are further divided on the fore-and-aft top line, and an additional channel member is provided at this joint. The Nene itself is contained in a plenum chamber which is roughly funnel-shaped and of slightly greater diameter thn the engine in order to allow sufficient air to reach the intakes to the rear side of the compressor impeller. Air is thus supplied evenly to the intakes on both sides of the compressor casing and is also free to circulate around the combustion chambers. The wall of the plenum chamber converges until it encircles the turbine casing and leaves only the jet pipe protruding. It starts as an inner nacelle skin, level with the front intake, at the second former from the nose, and is cantilevered back from the No. 3 former. Port and 9iarboard inner cones differ on the Lancastrian in that one contains a small air duct to supply the oil cooler and the Arrow and Heywood compressors. Details may be studied in the drawing. Above each cone is a streamlined duct carrying pipes and cables to the upper channel mem- ber of the cowling structure. This in turn leads them to the wing where throttles pick up the original Merlin runs to the pilot's levers. A detachable strip gives access to leads in the channel member. A cooling air exhaust pipe is led from the lower portion of the plenum chamber to the jet pipe relief duct and thence to atmosphere. The relief duct and its valve are to aid in starting, the organ pipe effect of the long jet pipe being broken down when the ground mechanic holds open the "[HE tubular mounting for the Nene is attached to the face of the Lancastrian front wing spar. Part of the load is transferred to the rear spar by the inter spar structures shown.
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