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).
Issues and potential improvements for 20/25 HP fan belts.
| Identifier | ExFiles\Box 55\2\ Scan209 | |
| Date | 22th September 1931 | |
| Hs{Lord Ernest Hives - Chair}/CWH. c. Hs.{Lord Ernest Hives - Chair} c. Mx{John H Maddocks - Chief Proving Officer} c. RY/SS{S. Smith} c. RY/CS 8196 RECEIVED BY, 11/G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 22.9.31. RECEIVED 1931 SEP 22 HS{Lord Ernest Hives - Chair} 20/25 HP. FAN BELTS. Referring to your report on the 10,000 miles test on 19-G-4, we had already taken up the question of belt trouble with the Dunlop Co. as we had experienced some little trouble on test, and we were not satisfied that the cause of the trouble was clear. We had the Dunlop representatives (Messrs. Harris and Sadler) over, and the matter was very carefully gone into. The Dunlop representatives at once pointed out when they saw the belts in position that they were definitely on the tight side, and stated that it would be necessary for them to add a ¼" into the length of the belt in order to get the correct tension for the minimum centres. We agreed for this to be done, and we further asked that whilst giving us three belts lengthened in this manner that they would also give us three similarly lengthened belts, faced with harder rubber. One point of view which has occurred to me which I think has a definite bearing on the matter is that on the 40/50 HP. we have a spring controlling the tension, and although this spring is set up fairly closely it certainly does give relief on the belt tension if and when the engine is suddenly revved up. We think, therefore, that it would be desirable to try out a similar spring control on the 20/25, and we are getting out a scheme for this purpose. At the same time we are instructing the Order Office to obtain some belts for the 20/25 from the same source as those used on the 40/50 HP. Ry BY.{R.W. Bailey - Chief Engineer} | ||