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).
Stationary dynamometer tests on a 25 HP model to investigate and separate exhaust boom from engine vibration.
| Identifier | ExFiles\Box 137\4\ scan0133 | |
| Date | 8th December 1930 | |
| 634. To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} c. to Eg. HOR. c. to Da.{Bernard Day - Chassis Design} L. c. to Py. EV.{Ivan Evernden - coachwork} Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}4/MJ.8.12.30. BOOMS ON 25 HP. Attached herewith please find report ref: Hs{Lord Ernest Hives - Chair}/GR.{George Ratcliffe}2/MJ.8.12.30. These tests have been conducted with the car stationary, driving the rear wheels through dynamometer drums with a separate power unit. It is a coincidence that we find a boom in the exhaust at almost exactly the same speed as a vibration in the engine. Having separated the two, we should be able to make progress. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||