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).
Diagram for a Stiffened Flywheel PII.
| Identifier | WestWitteringFiles\V\2January1931-April1931\ Scan044 | |
| Date | 2nd March 1931 guessed | |
| Hs{Lord Ernest Hives - Chair} 325 RECESS FOR NUT .650 Rd .615 .300 .415 2.460 DIA 1/16 10.000 DIA FOR OTHER DIMENSIONS SEE G 77287 STIFFENED FLYWHEEL PII | ||