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).
Frictional loading of the 20/25HP Slipper Flywheel and its effects on vibration and engine gear rattle.
| Identifier | ExFiles\Box 107\1\ scan0159 | |
| Date | 23th November 1932 | |
| X7960 w/s [crossed out] Mr. [crossed out] c Hs.{Lord Ernest Hives - Chair} ✓ c w/s [crossed out] c WHS [crossed out] from Mx.{John H Maddocks - Chief Proving Officer} Mx{John H Maddocks - Chief Proving Officer}14/T23.11.32. GAU-7 - Trials Car With reference to your memo PN{Mr Northey}3/WT22.11.32 which Hs.{Lord Ernest Hives - Chair} has passed to me to deal with. The frictional loading of the 20/25HP Slipper Flywheel should ne 14 lbs. +- 2 lbs. at 17 1/2" radius. We dare not adopt such a low loading as 10 lbs. as with this loading there is a great danger of the half speed crankshaft period occurring (approximately 40 m.p.h.) We do not know of any crankshaft or engine vibration at 52 m.p.h. which will be affected by the slipper wheel loading, in fact we are not aware of a vibration at any speed which will be caused by high slipper drive loading. We always work to the lowest loading that is permissible, as the lower the initial loading the more likely it is to maintain consistent. Furthermore high loading on the present 20/25HP definitely increases the tendency for engine gears to rattle. [Signature/Initials] [STAMP: RECEIVED 24 NOV 1932] [Handwritten: 18632] | ||