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 detailing model crank tests with diagrams and results.
| Identifier | ExFiles\Box 63\4\ scan0113 | |
| Date | 28th January 1930 | |
| MODEL CRANK TESTS ORIGINAL FLYWHEEL U648 I = 15.1 LBS FT² INCREASED TO 18.55 " " DES 989 WEBS .275 THICK TOTAL REVERSALS 10,000,000 UNBROKEN FLYWHEEL INERTIA INCREASED 30% FURTHER REVERSALS 1,444,264 BROKEN ROLLS-ROYCE, LIMITED PRINT R.D. 28 JAN 1930 | ||