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).
Information on how an 'over-run boom' at 3,000 revs was improved on a car.
| Identifier | ExFiles\Box 90\4\ scan0163 | |
| Date | 30th March 1938 | |
| 261 s.s. To JLE.{J. Lee Evans - Chassis Test Manager} from Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} c. Hd.{Mr Hayward/Mr Huddy} Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}2/AP.30.3.38 Lp.{Mr Lappin} was here today and said by some means you had greatly improved the over-run boom at 3,000 revs on his car. We have been struggling for a week to overcome a similar boom on Raymond Mays new car with very little success. Please let us know what you did to improve Lp.{Mr Lappin}'s car. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||