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).
Press clippings regarding new silencer technology for aircraft engines and other aircraft refinements.
| Identifier | ExFiles\Box 152\3\ scan0216 | |
| Date | 29th July 1936 | |
| Aeroplane June 1936. New Silencer for Aircraft Engines A new type of silencer for aircraft engines has just been produced by Servais Services, Ltd., 8, Old Pye Street, Westminster, London, S.W.1. An exhaustive test is being carried out, and we hope to be able to give a full report of this in our next issue. The silencer has already been tried out with considerable success on various types of motor-cars, with resultant maximum silencing effect with minimum loss of power. The construction is an outer casing enclosing a straight through exhaust tube, the space around which is filled with sound-absorbing material. In view of the campaign of the Anti-Noise League, this new type of silencer is of interest. The same enterprising firm is tackling the elimination of airscrew swish—an equally important item which contributes to the noise of aircraft in flight. Servais DURRANT'S PRESS CUTTINGS St. {Capt. P. R. Strong} Andrew's House, 32 to 34 Holborn Viaduct, and 3 St. {Capt. P. R. Strong} Andrew Street, Holborn Circus, E.C.1. Telephone: CENTRAL 3149 (Two Lines). Aeroplane 5/15 Rosebery Avenue, London, E.C.1. Cutting from issue dated.............29 JUL 1936 Super-Drone Refinements KRONFELD LTD., of Hanworth Aerodrome, Feltham, Middlesex, have now added a mechanical starter, an adjustable trimming gear for the elevators and a heater for intake air to the standard production Super-Drone. A silencer was fitted to the 18 h.p. Douglas motor recently and the intake-heater box is a muff on the fore end of the expansion chamber of the silencer. The fore and aft trimming-gear consists of a small lever and quadrant on the base of the control column which tensions or releases an elastic loading device. The mechanical starter is a neat arrangement to allow the wire starting cable to be wound on to the airscrew hub as usual and then to be pulled by a double length of heavy aero-elastic inside the tail which is first stretched by a small ratchet handle at the side of the fuselage well aft. A trip-catch in the cockpit releases this system at the pilot's will while he is sitting ready to go off. The Super-Drone in which these additions were shown has been built for a private owner as a machine for flying practice before he uses his Condor high-efficiency glider. Consequently for cloud-soaring he has a Collins variometer, a Pullin electrical turn-indicator (battery-driven, £16) and a Sestrel compass. These, with the ADDING SILENCE.—A Servais Swiss-roll silencer as described in this paper for June 17, on a Taylor Cub. The exhaust gases have an unimpeded passage through the expansion chamber, so there is no increase in back pressure. 69 | ||