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).
Use of an existing crankshaft diameter and balance weights, weighing advantages against the risk of torsional vibration.
| Identifier | ExFiles\Box 35\4\ scan 108 | |
| Date | 16th March 1914 | |
| R.R. 235 A (150 11) (V.V. 585. 23.2.12) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 0363. Mr Hives To Wor.{Arthur Wormald - General Works Manager} for EH. from R.{Sir Henry Royce} Copy to J.{Mr Johnson W.M.} Copy to E.{Mr Elliott - Chief Engineer} Copy to Na.{Mr Nadin} X. 68. R13/P 16.3.14. There is no need to test the large and small diameter of crankshaft. We are obliged to use our present diameter, until we make the new engine, the diameter of which we have already fixed, and shall not alter it unless something demands it. The experiment with balance weights should be made on the Analyzing "ig, and also should be made on the Test Plate. We know that they have many advantages independent of what can be found on test. The two advantages that they have are, that they add weight and cost to the car, which I think is justifiable, as it is a distinct feature towards perfection, and can be used as a "selling cry." The only thing I fear is that at some particular speed beyond which we can test on the road, say near 2500, there may be torsional vibration of the crankshaft, that cannot be controlled with the present amount of friction of the slipper drive. The speed at which such a vibration occurs would be reduced by the use of balance weights and if there is such a vibration it might be brought within a running speed. R.{Sir Henry Royce} | ||