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).
Lightened flywheel and stiffened clutch pressure plate for the Phantom III.
| Identifier | ExFiles\Box 93\3\ scan0082 | |
| Date | 30th January 1938 | |
| GRY{Shadwell Grylls} X312 DF: C. Helliwell per PHO/dis/fm. E/HDY.{William Hardy}2/HP.30.1.38. Lightened Flywheel with Stiffened Clutch Pressure Plate - Phantom III. N.Sch.4747 herewith shows the above combination. The inertia has been reduced as nearly as possible to that of the original clutch flywheel, to N.Sch.4229, but is still 10% more. The increased inertia flywheel to N.Sch.4671 is 90% more than the original. E/HDY.{William Hardy} N.Sch.4747 herewith. | ||