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Aviation History
1951
1951 - 1313.PDF
12 FLIGHT 13 JULY i)si °Pe/r The Hobson Cockpit (Engine) Control Box, now specified for a number of aircraft types, provides not only for control of engine power and r.p.m., but allows for the additional control of braking propellers through aft movement of the pilot's throttle levers from the fully closed position. Once the aircraft has landed, various automatic safeguards ensure satisfactory functioning under all operating conditions and these include prevention of engine stall during propeller reversal, engine overspeed during the propeller zero pitch range, and swing of aircraft when applying propeller braking. On multi-engined aircraft, where dual control is necessary, the control box is duplicated, with interconnections giving full operational control to both pilots. Each Control Box contains four throttle levers and four propeller levers, respectively grouped in such a way as to facilitate their operation separately or collectively. For propeller braking, the throttle levers can only be moved all together or in pairs, i.e. the inner levers or outer levers together, this being a precaution to prevent the aircraft swinging during a landing run with braking propellers applied. All levers can be set in any desired position by means of a damping device fitted to the port control box spindles, and manipulated by a short external lever. Hobson COCKPIT CONTROLS • CARBURETTERS H. M. HOBSON LIMITED, FORDHOUSES, WOLVERHAMPTON. Licensees in U.S.A. and Canada: Simmonds Aerocessories Inc.
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