From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Report discussing the trial of oil-motors for pre-rotating aircraft wheels and notes on hydraulic control and steering systems.
| Identifier | ExFiles\Box 178\2\ img006 | |
| Date | 1st January 1940 guessed | |
| -S.2- ...to get rid of noise and pressure fluctuations. ...as experimental development of jet propulsion. On the West Coast it is being applied to aircrafts by using a series of three pumps, one on the engine, and driving the third pump which pumps fuel from the tank... This requires detail redesign of the gear. Motors. With Davis oil-motors, of the gear-pump form, are being tried for spinning the wheels of large aircraft prior to landing. This saves quite a few dollars worth of rubber, which is now scuffed off when landing. It is difficult to believe the injector consists of a series of nozzles at the exit of the gas stream working at 800 lbs. pressure. The system has the tendency to freeze over due to the instantaneous. He claims a close basis from the suction side from the reserve tank. Davis says this device works O.K. instantaneously. NOTE: Stroboscopic means are being used for the study of oil-flow from gear pumps. Copies to Lessells. Keel. Hydraulic oil Control For controlling all forms of large vehicles, the trucks and buses and more recently for air-brakes on large trucks and buses, and for braking systems of aeroplanes... It is proposed to control it by hydraulic means. (As you will have read), the common wheel-brake is being replaced by disc-brakes. These systems contain oil pressure accumulators of various types. The pressure is maintained by a small off-pump driven by a pressure-sensitive microswitch, which is operated at about 800 lbs. Many of these accumulators leak from the usual amount of leakage... Compressed air or nitrogen cannot be dissolved in the oil. Attached sketch shows 'Davis' description of a new type accumulator. A middle chamber which is used simply to fill up space, which avoids these troubles, is filled with glycerine, which is separated from the oil in the outer tube by a thin rubber diaphragm. The end tube contains the compressed nitrogen. Steering The Davis steering is quite likely to be applied soon on large vehicles, but instead of interrupting the flow of a circulating oil system it will use a hydraulic pressure-storage system as described. The possibility of using such systems in large aircraft is under consideration. | ||