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).
Recommendation on the damping load setting for the Bentley clutch spring drive to prevent rattle.
| Identifier | ExFiles\Box 85\2\ scan0051 | |
| Date | 4th December 1933 | |
| X212 To By: from Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} c. to Mx.{John H Maddocks - Chief Proving Officer} Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}7/KT.4:12:33: BENTLEY CLUTCH SPRING DRIVE. We understand that works are fitting up some of these with the damping load as high as 30 lbs.ft. Mx.{John H Maddocks - Chief Proving Officer} has reported a case of rattle when set at 28 lbs.ft. We recommend therefore that 18 - 22 lbs.ft. should be the limit for the spring drive setting in the works. It is very easy to check for load and alter it if necessary by the length of the bronze distance pieces. We think it would be cheaper to set them correctly in the first instance than to have to take them down after a road test. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||