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).
Vibration issue on the 20/25 model after fitting a Bentley flywheel and proposing a test modification.
| Identifier | ExFiles\Box 103\1\ scan0159 | |
| Date | 8th February 1935 | |
| To RHC.{R. H. Coverley - Production Engineer} c. to Mx.{John H Maddocks - Chief Proving Officer} x5300 Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}7/KW. 8.2.35. 20/25 FLYWHEEL. Since fitting the Bentley flywheel on the 20/25, production are in trouble with a new vibration at 2100 r.p.m. We find an additional inertia of 426 lbs.in.² can be got from the forging, and wish to try whether this amount will have a beneficial effect. Will you therefore please put in hand a ring in S/M to Hs.{Lord Ernest Hives - Chair}1766, which Mx.{John H Maddocks - Chief Proving Officer} will fit to a production car for test purposes. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||