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).
The fitting of a new silencer to a car, noting issues with engine boom and suggesting brake attention.
| Identifier | ExFiles\Box 104\2\ scan0046 | |
| Date | 1st July 1932 | |
| To C. from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} To PN.{Mr Northey} c. Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} X5230. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}5/ADS.7.32. GET-24. We have now fitted a silencer to this car and we are returning it to you today. In trying this car we notice that it suffers from an engine boom, in fact it appears to have an indication of crankshaft period. However, you will doubtless not let this confuse your tests. In any case, we are quite satisfied that we suffer less from exhaust booms with the resonance silencer than with the existing standard silencer. You will be able to judge the amount of noise which issues from the fishtail on this car which is the point where we cannot reproduce London conditions. The only work we have done on the car is to fit the silencer but we suggest that the brakes receive attention. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||