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).
Different balance weight schemes for flywheels and crankshafts, referencing experiments and 25 HP production designs.
| Identifier | ExFiles\Box 14\2\ Scan120 | |
| Date | 9th May 1931 | |
| R2/M9.5.31 contd. -2- the half weights are correct provided there is no error in the angle, which in the 8 weight scheme is not likely to occur. Regarding the 4 weight scheme we now see that this does not help very much the steadiness of the flywheel, and if carried to the full amount might absolutely be worse than no balance weights. We think this explains why you are disappointed with the 27-EX experiment. We have also come to the conclusion that with a fair amount of balance weight on the 12th web it may not be necessary to reduce the inertia of the flywheel more than is naturally permitted by the momentum added by the balance weights. P.2. WW. scheme of 12 balance weights to the 8 weight scheme, keeping the larger 4 weights at their present value. When you have done this we shall be pleased to hear to what speed the master torsion is. I do not like the idea of the heavy weight at the short centres and think we had better be contented with whatever balance weights we can put on at the same external radius as the outside of the crank web. The designs for 25 HP. production are sent by this post. We hope you will like the improved method of fixing, arriving at perfection with fairly large tolerances. R.{Sir Henry Royce} | ||