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).
Report page detailing engine bearing stiffness measurements and discussing experimental procedures for crankshaft frequencies.
| Identifier | ExFiles\Box 65\4\ scan0227 | |
| Date | 25th April 1928 guessed | |
| Contd :- -2- Engine. Piece No. Stiffness in in-bearings. Lbs.ins/rad. out-of-bearings. India 111. 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 1.366 " 1.279 " We foresee some difficulty in explaining or correlating the varying percentage differences. We saw Mr. Constant's 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, | ||