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Aviation History
1951
1951 - 1770.PDF
Flight, 7 Septemoer 1951 Regd.SERVODYNE POWER ASSISTANCE FOR FLYING CONTROLS Essential to high-speed and large aircraft Both the high-speed aircraft and the heavy air- craft demand control forces beyond those that human effort can provide over long flying periods, and the Lockheed 'Servodyne' system of power assistance was evolved to meet this requirement and developed over a long period. It gives positive and immediately responsive 'assistance', with any desired predetermined proportion of feel-back, so that sympathy with the aircraft is still maintained. Because of the self-lubricating properties of the hydraulic fluid, the 'Servodyne' mechanism is practically frictionless, a valuable asset when the pressure is not available. The control is effected by a special feature whereby ' hydraulic backlash' is avoided, maintaining the fluid in the system in a state of pre-loading which gives a positive control without low-rate 'give'. Our experience in large-scale manufacture has enabled us to produce a control valve which has great durability and insensitivity to dirt, with refinements which safeguard it against distortion and ensure free movement at low temperatures. The 'Servodyne' is preferably served individually by the famous Lockheed engine-driven pump, but on small and medium size aircraft, the normal hydraulic system is used as the power source, the 'Servodyne' taking but little power. AUTOMOTIVE PRODUCTS COMPANY LTD. LEAMINGTON SPA, ENGLAND Diagrammatic section of the 'Servodyne', showing differential piston and simple valve control. traulic specialists in safe, engineering
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