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).
Potential engine and chassis improvements to reduce impulses and noise.
| Identifier | ExFiles\Box 137\4\ scan0246 | |
| Date | 7th March 1931 guessed | |
| (2) I am not saying our chassis is as perfect as it ought to be, but if it were we could not expect to get a good silent car with a body which had an undamped period anywhere near our engine impulses, whether they come from - Gas pressure - 6 per 2 revs. Piston weight - 3 per rev. Couples - 1 per rev. We are still hoping anxiously to get some benefit from keeping the flywheel steadier - light and stiff, and the crank-shaft straight - balance weights. P. 2. crankshaft flange looks very thin. To make a proper move we should do all the improvements to one engine as quickly as possible. (1) Thicker crankshaft flange: this should be altered on production at once. (2) The W.W. dimensions of back plate. (3) More bolts. (4) Lighter flywheel (less overhang) and less weight in parts remore from bearings. If all this does no good then parts are not wrong, but one feels that they must shew some change. If so you can easily work backwards to find the greatest sinner. If no change, and a fault is proved to exist then we can only conclude it is the crankchamber, and we should get some good from the balance weights. R.{Sir Henry Royce} | ||