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 for a stiffened flywheel.
| Identifier | ExFiles\Box 13\7\ 07-page094 | |
| Date | 10th March 1931 guessed | |
| H=325 RECESS FOR NUT .625 RAD FOR OTHER DIMENSIONS SEE G 77287 STIFFENED FLYWHEEL. P.II 10.060 DIA 2 1/4 DIA .300 .415 R.12 R.62 | ||