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).
Performance calculations of Whittle belts and proposing further experiments with different pulley and chain drive configurations.
| Identifier | ExFiles\Box 55\2\ Scan037 | |
| Date | 9th April 1915 | |
| COPY. Wor.{Arthur Wormald - General Works Manager} for Hy{Tom Haldenby - Plant Engineer} from R.{Sir Henry Royce} Hy{Tom Haldenby - Plant Engineer} to J.{Mr Johnson W.M.} [Handwritten Notes] DC [crossed out] 493 R3/IB9415. April 9th. 1915. -Re Whittle Belts.- -------------------- The weight of the whittle belt should be given, because the tension due to centrifugal force should be deducted from the working tension, so that one would have to deduct the tension of the slack side of the belt and the centrifugal force, to which should be added the useful pull of the belt, before we should find the true horse power. It will be noticed that the Whittle belt people have always taken in their list that the belt will do 50% more horse power with 50% more speed. This cannot be right, and the list is not worth taking much notice of. I think you might experiment with this a little longer when you get the ¾" belt, which is really necessary. I should also like to get a similar chain drive for about 2000 ft. a minute from Hans Reynolds. This would have pulleys, the large one being about 5" and the small one 2½". In experimenting with the Whittle belt, it might be advisable to have another pulley in ratio of about 8 to 5, which would reduce the speed to 2400 revs instead of 3000 revs, and you would see whether the 2¾ HP was more easily carried with this ratio than with the ratio of 8 to 4. | ||