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).
Test results comparing slipper flywheels made of Bakelite versus Cotton Duck to address a 'Galloping Knock' on the Phantom model.
| Identifier | ExFiles\Box 66\4\ scan0109 | |
| Date | 20th March 1928 | |
| Wor. {Arthur Wormald - General Works Manager} Hs {Lord Ernest Hives - Chair} By mb X8300 Mx {John H Maddocks - Chief Proving Officer} /McM6/T20.3.28. "Galloping Knock" - Phantom With reference to Mx {John H Maddocks - Chief Proving Officer} 1/T24.2.28 - 5th paragraph. The slipper flywheels referred to have now been tested after standing for 3 weeks. The results are tabulated below. These confirm that the cotton duck fabric gives more consistent results than the bakelite, and also gives smoother action. Std. Bakelite. Cotton Duck When Erected 153 lbs. ins. 153 lbs. ins. After Unit Test. 119 lbs. ins. 153 lbs. ins After standing 3 weeks (starting) 170 lbs. ins. 153 lbs. ins. do to keep going. 102 lbs. ins. 153 lbs. ins. | ||