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).
Test report comparing different engine mounting configurations and their resulting vibrations.
| Identifier | WestWitteringFiles\K\October1923\ Scan46 | |
| Date | 11th October 1923 | |
| Hs{Lord Ernest Hives - Chair}5/LG11.10.23 -2- 11.10.23. TEST NO. | ENGINE MOUNTING. | VIBRATIONS. ---|---|--- 13 | Engine supported on centre of crankshaft - weight changed from position underneath engine to side position. | Generally rough from 12 to 17 m.p.h. 14 | As No.13 with damping added. | Much improved - slight period at 16 m.p.h. 15 | Standard engine mounting with weight fixed on to side of engine. | Very good - slight period at 11 m.p.h. and 17 m.p.h. 16 | As No.15 with damping added. | Periods slightly less than No.15. 17 | Standard engine mounting with weight to balance engine - No dampers. | Very good - better than No.15 - slight period at 12 m.p.h. 18 | As No.17 with damping added. | Very good - dampers bring up slight period at 16 m.p.h. but improve period at 12 m.p.h. 19 | Engine mounted to LeC.1763. Rigid two-point at the front - single-point at the rear. | Slight vibration at 17 m.p.h. This is an improvement over present engine mounting but not quite as good as std. with friction. | ||