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Aviation History
1945
1945 - 2362.PDF
NOVEMBER 29TM, 1945 FLIGHT .589 \THE MARTIN-BAKER M-B V Tidiness and convenience have been specially consideredin the cockpit layout. This view of the port side shows the fore-and-aft trimming wheel, the undercarriage selectorlever, the throttle and airscrew control, and the pneumatic pressure gauges for the brakes, undercarriage and flaps. four 20 mm. cannon, and the machine carries 200 rounds of ammunition for each. In addition, the fuel tankage is more than 200 gallons (giving quite an extended range at cruising speed), so that the fact that the loaded weight is only 11,500 lb. appears to indicate a very low structure weight. We have frequently mentioned the advantage, in a small aircraft, of the girder-type of fuselage as compared with the stressed-skin shell. Evidently Mr. J. Martin, chief designer and managing director of Martin-Baker, is of the same opinion. The M-B V has such a fuse- lage, and the covering is in large removable panels which make not only installation of equipment easy but greatly facilitate maintenance and servicing afterwards. The wing is of the single-spar type, with the spar and leading edge forming a torsion box. The details of the LENGTH - - 37ft. 9in, SPAN - - 35ft. Oin. WING AREA - 262 sq. ft. ROLLS-ROYCE GRIFFON 83 The wing is of the single-spar type, with the leading edge forming a torsion box. Three radiators are grouped together in the M-B V. The front is the inter-cooler, the next the main cooler, and the rear one the oil cooler. wing primary structure are simple and straight- forward. The flying con- trols are operated by tor- sion bars, which make for light control. An undercarriage of very wide track is fitted, the wheels retracting in- wards. Operation is by compressed air, and has been found entirely trouble-free. The tailwheel also retracts. In the pilot's cockpit the controls and instruments are arranged in very convenient positions, no contortion of the pilot's body being necessary in order to reach any of the controls. The construction of the instrument panel is somewhat novel. A sub-frame (which has the stiffness necessary to make it a part of the structure) carries three swinging panels which open outwards to give instant accessibility to any of the instruments. The hood, of "teardrop" form, has three-point suspension and can, as has been demonstrated, be jettisoned. The engine of the M-B V is a Rolls-Royce Griffon 83, Basically this is identical with the engine fitted in the Spitfire 14 and 21, but with the important difference that, whereas the latter drive five-bladed single air- screws, the 83 drives contra-rotating "double-threes. ' The gears by which this is accomplished are shown dia- grammatically and in section in one of our illustrations. The modification to the reduction gear to make it suitable for contra-rotation did not entail major altera- tions to the front of the engine. The airscrew shafts Primary structure of the M-B V fuselage is of the girder type. Large detachable panels give good accessibility.
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