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Aviation History
1934
1934 - 0711.PDF
JULY 12, 1934. FLIGHT. 713 A general view of the centre section unit of the " Envoy " showing the two mountings for the Wolseley engines, and the circular plywood bracing between the spars. sional stiffness. The wings and Frise type ailerons are fabric- covered. The retractable undercarriage is almost identical with that of the "Courier," and is extremely simple. The Vickers oleo-pneumatic compression strut is hinged to the front spar in the same plane as the bent axle. The radius rod running backwards to the rear spar is divided unequally, the short portion being in front. An oil cylinder is attached to the top of the rear spar, and in it is a piston with the piston rod attached to the front end of the longer portion ot the radius rod. When the piston is withdrawn into the cylinder by means of oil pressure, the radius rod is bent and pulled upwards into the wind, carrying with it the under- carriage and about three-quarters of the landing wheel. This is arranged so that in cases of dire emergency on very rough ground the pilot could land a machine with the wheels in the retracted position, knowing that there would be no possibility of turning over on doing so. An electrical indicator system is fitted to tell the pilot the position of the wheels. The flying controls provided for the pilot consist of a control wheel and parallel-motion pedals for rudder operation, com- bined with a very neat form of rudder bias gear enabling the FORE S. AFT LEVEL INDICATOR UNDERCARRIAGE INDICATOR ^(ELECTRIC) MASTER SWITCH (UNDERCARRIAGE ELECTRIC GEAC) .CHANGE OVER LEVER (UNDEBCABBIAGE) SAFETY CATCH FOR CHANGE OVEB LEVER PASKING BCAKE CONTROL HYDRAULIC PUMP HANDLE (UNDERCARRIAGE) A diagram of the retractable undercarriage of the •' Envoy." When retracted the wheel protrudes about one third of its diameter beneath the whig. Both sides of this undercarriage are the same. This is what you see when looking into the pilot's cockpit through the bulkhead door hi the passengers' cabin.
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