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).
Bearing stiffness measurements for different engine models and outlining a proposal for future experiments.
| Identifier | ExFiles\Box 25\3\ Scan343 | |
| Date | 3rd May 1928 guessed | |
| contd :- -2- Engine. Piece No. Stiffness in Lbs.ins/rad. In-bearings. out-of-bearings. India lll. E.54640 2.11 X 10^6 1.675 X 10^6 Sports Phantom. E.76546 3.485 " 2.610 " Std. Phantom. E.75216 4.12 " 3.740 " Std. 20 HP. E.54064 1.365 " 1.279 " We foresee some difficulty in explaining or correlating the varying percentage differences. We saw Mr. Constant's average arrangements for electrical excitation of crankshaft frequencies. Owing to the unsatisfactory results of his first preliminary experiment we propose trying our experiments on a car engine first where we know the answer. Yours faithfully, | ||