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).
Blueprint drawing of a stiffened flywheel, part PII, showing a cross-section and detail for a nut recess.
| Identifier | ExFiles\Box 137\4\ scan0239 | |
| Date | 18th December 1930 guessed | |
| Hs{Lord Ernest Hives - Chair} 325, .415, .300, 2.450 DIA, 10, 10.000 DIA, RECESS FOR NUT, .650 Rd, FOR OTHER DIMENSIONS, SEE G 77287, STIFFENED FLYWHEEL PII | ||