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).
Graph comparing torsional vibration amplitudes of the Goshawk and Phantom engines at critical speed.
| Identifier | ExFiles\Box 25\3\ Scan169 | |
| Date | 10th November 1926 | |
| TORSIONAL VIBRATIONS. COMPARISON OF VIBRATION AMPLITUDES AT THE CRITICAL SPEED ON PHANTOM & 20 H.P. WITHOUT ANY EXTERNAL DAMPING. PLAIN LINE GOSHAWK DOTTED LINE PHANTOM AMPLITUDE OF VIBRATION DEGREES. CRANK ANGLE DEGREES. Stamp Text: ROLLS-ROYCE, LIMITED PRINT ROOM 10 NOV 26 DERBY | ||