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).
Letter from Huntington, Heberlein & Co. Ltd discussing the specifications and test results for a new engine silencer.
| Identifier | ExFiles\Box 104\2\ scan0101 | |
| Date | 26th July 1934 | |
| CONTRACTORS TO THE ADMIRALTY. TELEGRAMS: INNOVATION, CANNON, LONDON. DRYWASHERS, NEWCASTLE-UPON-TYNE. NEWCASTLE OFFICE: 141, PILGRIM STREET, NEWCASTLE-UPON-TYNE, 1. CODES: LIEBERS, A.B.C., 5TH EDN. WESTERN UNION. TELEPHONE: MANSION HOUSE 6351/2. NEWCASTLE 28491. HUNTINGTON, HEBERLEIN & Co., LTD. METALLURGICAL, CHEMICAL & MECHANICAL ENGINEERS & CONTRACTORS. 47/51, KING WILLIAM STREET, LONDON, E.C. 4. OUR REF. JOB/JA YOUR REF: Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}4/KW 26th July 1934 Messrs Rolls-Royce Limited., DERBY. Dear Sirs, [Handwritten Note Start] Hdy{William Hardy} Please send this information Rm{William Robotham - Chief Engineer} → 1 2.000-7 O.D. Thickness 12SWG (0.104) 2 3670 cc. 3 2750 r.p.m [Handwritten Note End] For the attention of Mr.W.A.Robotham. I thank you for your letter of yesterday enclosing a drawing of your present silencer. I shall be pleased to make a silencer for you at once and to fit same on a 25 H.P. car if you will kindly let me know, the diameter of the intermediate pipe shown on the drawing between the silencer and the sliding joint, the total displacement and the normal r.p.m. at cruising speed. I shall then have a silencer made and sent up to you and will also send an engineer for installing it. You must have misunderstood my previous letter regarding the tests which have been carried out so far. The silencer has been used on motor cars in Sweden for about one year and has given most satisfactory results. It has also been used for motor boats, large Deisel engines, aeroplane motors, two-stroke Deisel engines etc. I have been over in Stockholm twice and had my engineers with me to observe tests which were carried out by the Swedish National Physical Laboratory at the Stockholm University. Here there were three engines on the bench under brake tests; one 500 H.P aero engine, one standard Chevrolet motor car engine and a motor cycle engine. The demonstrations were made under full load with silencer on and off. There was no appreciable diminution of output or revving when the silencers were on. The consumption of power would probably be from ½ to 1%. In all cases the explosion noise entirely disappeared and all one could hear was a very faint hissing, comparable with air or steam of very low pressure being blown out through a small cock. | ||