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 to Curtiss Wright Co. discussing engine cooling, B.T.U.s, exhaust valve tests and glycol.
| Identifier | ExFiles\Box 173\3\ img140 | |
| Date | 18th April 1934 | |
| Exptl. Dept. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} 9/KW. 18th April, 1934. Arthur Nutt, Esq., Chief Engineer, Curtiss Wright Co, Paterson, New Jersey, U.S.A. Dear Nutt, Sorry to worry you but we are interested to know the B.T.U's. which your engine gives to the cooling water at various speeds of water pump circulation and the temperature rise across the engine. If you could let me have this information I should be very grateful. We have now studied your exhaust valve tests which you sent over, and as far as we can make out your main object is to get the exhaust gas out of the cylinder in the early part of the valve opening; i.e., you have gone to a larger valve throat in spite of the fact that the limiting area is between the stem and the port. Do you alter your pump setting for Ethylene Glycol, and do you find that you get as much heat given to the glycol as to the water ? One would imagine there might be a difference owing to the difference in specific heat. We are still getting thoroughly inconsistent results on exhaust valves with lead, we can do two type tests on a certain combination of valve and seat and then fail badly on the third run under the same conditions. Yours sincerely, FOR ROLLS-ROYCE LIMITED. | ||