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Aviation History
1942
1942 - 2681.PDF
DECEMBER 24TH, 1942 FLIGHT 695 HYDRAULIC REMOTE CONTROL Messier Type C Equipment With Temperature Compensation R EMOTE control was a problem first examined by Messier in 1937, and two types were soon in production. These types, the Junior and Senior variations, were considered at the time to be an appreciable advance in the technique of transmis sion of manual control over long and tortuous paths. But considerable operational and laboratory experience has since been acquired, and Rubery Owen Messier, Ltd., have now per fected a new equipment, designated as type C. This new manually - operated hydraulic equipment has been devel oped mainly for throttle and airscrew control, but in general it can be arranged to suit any purpose calling ' for the application of a manually ^ originated movement at a distant ^ point. The efficiency is high, conse quently the action is light and smooth, and special provision has been made to eliminate completely any effects due to temperature variations. It is claimed The Transmitter. By operating the ram through an involute cam lever the mec hanical advantage is constant throughout the stroke. Priming connections and re setting valve are in corporated in this unit. that elastic deflection is negligible, there is no backlash, and the move ment is positive in both directions. There are three main components, the lever-operated transmitter (weight 1.8 lb,) ; the receiver (1.1 lb.) which is virtually a duplicate of the transmit ter; and the compensator (1.5 lb.). For the connections, pipe of £in. out side diameter is used. A load capacity of 180 lb./in. torque over a 68 deg. angle is available, equivalent to a 163 lb. push or pull over a 1.34m. stroke. Temperature compensation is by two cylinders and pistons which are pre loaded by a common spring system. The receiver is available either with a straight line motion, or with a lever or rotary drive. The transmitter and receiver are, as previously mentioned, almost identical, being in the nature of double acting jacks, although the transmitter has a priming connection and resetting valve, while the receiver has two screw-valve controlled bleeds. The transmitter lever drives the ram through an involute cam giving a uni form mechanical advantage so that the efficiency is constant and the "feel" is the same at all positions. The receiver is practically identical with the transmitter except that it has two bleed valves in place of the priming connection and resetting valve. Providing that the pipes are run closely together the expansion and contraction of fluid due to temperature variations will be the same on both, and the compensator is based on this fact. Both pipelines are led through it, and they are connected to separate chambers in which move pistons. These pistons are loaded by a spring assembly common to both and which is so dimensioned that the compensator pistons will not move under the influ ence of operating loads up to the designed maximum ; they maintain the system under a permanent initial pres sure so that backlash is impossible. As no priming valves are incor porated there is no trouble from this cause, and it is also possible to use the control in conjunction with mechan isms which do not call for the full travel of the operating ram, such as in those cases where external mechan ical stops are used. Leakproof glands are a feature of the equipment, the Messier organisation having the widest experience in this direction. In any event, slight loss of fluid is auto matically allowed for by the compen sator, while adjustment for synchron ism is easily effected and does not call for special valves. The compensator casing is engraved with marks to indi cate its position at normal fluid level and the need for replenishment is, therefore, checked without dismantling any part. INDIVIDUALISTIC EFFORTS "FHE perfect "after-dinner speech" •*• is practically unreportable be cause its essential qualities belong far less to its text than its texture. Thus it is hardly possible to do justice fL in chilly print to the speeches which * accompanied the Ernest Turner Group luncheon, held recently in a West End restaurant, where the commendable austerity of the menu in no way im paired the brilliance of the speakers. Mr. Alan Turner was in the chair. Sir Frederick Handley Page, guest of honour, was in grand form and, prefixing his more serious observations with the remark that he must be care ful what he said lest he tell the enemy something they already knew quite well, expressed the opinion that if this country was gping to survive in the peace to come, it would be by those very individualistic characteristics which had built up the Empire and its trade in the past. "The efforts of the Government to ameliorate our lot," he said, "de pend finally upon the efforts of the individual to bring prosperity and so make things better for those less fortunate than ourselves." Sir Frederick's humorous digs at the official mind, however, were cleverly countered by the penetrating wit of Sir Alexander Cunuison when he re sponded for the guests, so that, with a bright cabaret and a well-produced sound film of Turner industrial activities, the entertainment value of the function was pleasantly high.
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