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).
Vibration test data for a 25 HP H.L. Engine, showing crank deflection under various loads.
| Identifier | ExFiles\Box 5\6\ 06-page088 | |
| Date | 6th November 1930 | |
| To R.{Sir Henry Royce} From He/An. c. to Sg.{Arthur F. Sidgreaves - MD} Box. c. to R.{Sir Henry Royce} Ds. c. to Ev.{Ivan Evernden - coachwork} X5300 He/Sc.2/WJ.6.11.30. x634 x5300 H.L.ENGINE VIBRATIONS. 25 HP. With reference to He/Sc.3/WJ.31.10.30. Herewith figures taken with the crank at right angles to and parallel to the direction of load application. - No.6 CRANK AT 2D PAST B.D.C. LOAD ON LEVER - Ls. | DEFLECTION INS. Clock A.{Mr Adams} | Clock B. | Clock C. | Clock D.{John DeLooze - Company Secretary} Zero. | Zero. | Zero. | Zero. | Zero. 20 | .003 | .004 | .0035 | .002 40 | .005 | .0085 | .008 | .005 60 | .0075 | .0125 | .011 | .007 80 | .010 | .015 | .015 | .009 100 | .012 | .020 | .0195 | .0115 SET | 0 | 0 | 0 | 0 | ||