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).
Overheating issue in Australia, suspecting it's caused by a choked exhaust throttle and proposing a test and cable message.
| Identifier | ExFiles\Box 24\5\ Scan012 | |
| Date | 23th April 1925 | |
| X766 DJ. JH. -- BY3/H.{Arthur M. Hanbury - Head Complaints} 23.4.25. -- OVERHEATING - AUSTRALIA. ----------------------- Referring to Hs{Lord Ernest Hives - Chair}' recent report on the above subject, in talking the matter over again with him, he feels certain that under full throttle conditions, no trouble can occur, but he is more than ever inclined to think that the trouble they are experiencing is due to the combined effects produced by having a choked throttle in the exhaust system which does not open fully until a certain specified main throttle opening has been obtained, and even then there is a risk that the choked throttle in the exhaust system may not be correctly positioned relative to the main throttle, that is, it may not be obtained sufficiently quickly. We therefore advise that you cable Australia to make further tests by fixing the choke valve in the exhaust system fully open, disconnecting it entirely from the throttle. When this is done, the Experimental Dept. are assured that there is no possible difference between the old type exhaust system and the new. A suggested cable is as follows:- "Consider overheating trouble due to incorrect relationship between choke valve and main throttle. Stop. "To prove this disconnect choke valve from main throttle and fix former in fully open position. Stop. "Trouble probable been most acute when main throttle about half open." Bailey Roycar. BY.{R.W. Bailey - Chief Engineer} | ||