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).
Investigating a 'booming' noise in a Limousine trials car, concluding it originates from the exhaust note synchronizing with the body.
| Identifier | ExFiles\Box 49\2\ Scan141 | |
| Date | 12th December 1922 | |
| X4256 To Hs.{Lord Ernest Hives - Chair} from Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork} c. to Da.{Bernard Day - Chassis Design} c. to Sp.{Mr Spinney} Da{Bernard Day - Chassis Design}/EV{Ivan Evernden - coachwork}2/M5.12.22. RE. LIMOUSINE TRIALS CAR X.4256. X.4238 The limousine trials car is apparently useless due to it being a dreadful boomer, and up to the present this booming has been put down to axle noise. As a result of evidence gained whilst in town (in conjunction with SP.{Mr Spinney}) it seems to us obvious that it is not the axle at all that is causing the body to boom, but the exhaust note, which in this case apparently and unfortunately, synchronises with the body note, and is therefore worse than the other fixed roof cars that we have had. The body itself may be a slight boomer. The booming was worse when the windows were open, but diminished when the exhaust was muffled with a rag. It does not necessarily follow that the exhaust need be more baffled than at present, but it seems only necessary to change the note of the exhaust. Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork} | ||