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 concerning a new silencer and gas turbine invention by Professor Pio-Oulsky.
| Identifier | ExFiles\Box 152\3\ scan0170 | |
| Date | 2nd August 1935 | |
| Private & Confidential M. {Mr Moon / Mr Moore} G. {Mr Griffiths - Chief Accountant / Mr Gnapp} BRODIANSKY Dipl. Eng. 21, Linkenholt Mansions, London, W.6. 2nd August 1935. E.W. Hives, Esq., Chief Experimental Engineer, c/o Rolls-Royce Ltd., Nightingale Road, Derby. Dear Sir, On the 24th ultimo I wrote to your Managing Director Mr. A.F. Sidgreaves on the matter of a new silencer invented by Professor Pio-Oulsky and I have received a reply from him asking me to get into touch with you on the matter. At the same time I understand that you are already in possession of a copy of my letter to Mr. Sidgreaves. I am well aware that a great deal of your time must be taken up with propositions relating to new inventions and that in most cases it is impossible to share the inventors' sincere enthusiasm, but in this case it must be borne in mind that Prof. Pio-Oulsky is very well known on the Continent as a specialist and constructor of steam turbines, and he is co-operating in this case with a very highly qualified engineer constructor Mr. Volohov. I therefore venture to add the following particulars to my letter above mentioned: 1. The special design of gas turbine has some features which make it differ from the gas turbines of Brown Boveri and Ratau, because it is designed not as a motor, i.e. to produce a maximum power, but especially to take a maximum of gradually decreasing velocity of gases. By the adjustment of a specially designed diaphragm the decrease of the velocity of gases is effected in the same manner as in an aeroplane. 2. The question of cooling cannot present any difficulties because the temperature can be decreased to 550°C. 3. According to the calculation made by the Professor the following data applies to a 500 h.p. aero-engine: (a) The gas turbine gives a back resistance equal to 37.8 h.p (b) The power obtainable from the gas turbine and transmittable to the main shaft is 41.1 h.p. Therefore there is a net increase of efficiency amounting to 3.3 h.p. Since writing my letter above mentioned I have received further information from Prof. Pio-Oulsky that he has lodged only ten days ago a further patent relating to a device which can be fitted to the silencer of an engine and permits of connection with any silencer without diminishing the efficiency of loading the cylinder with the explosive mixture. (The first Patent was granted in Jugo Slavia on 11th June 1935) The combination of the two patents makes possible the solution of the problem of silencing the motor whilst considerably increasing its efficiency, - in the case of a 500 h.p. motor, as shown by the calculation, the increase is nearly 40 h.p. (i.e. 8 per cent). | ||