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).
The performance of a 3-piece 'Brammer' type fan and dynamo belt after road testing.
| Identifier | ExFiles\Box 55\2\ Scan168 | |
| Date | 13th September 1924 | |
| +4657 Hs.{Lord Ernest Hives - Chair} EP{G. Eric Platford - Chief Quality Engineer}3/H13.9.24. re. Fan & Dynamo Belts. (3-piece "Brammer" type.) With reference to your request for a report on the above - we return herewith a belt which has run 6,326 miles on the Demonstration Class 40/50 car, 7-LW. They report that during this period the only attention it has received has been the usual adjustment, which adjustment is now all taken up. It is pointed out that the distance run on this car is a good test, as it constituted a considerable amount of engine running owing to continual gear changing etc. We notice that the belt appears to be dry and has not been intentionally oiled at any time. You will also notice that there are definite signs of various links cracking. From a quietness point of view the belt is still satisfactory and the quietness is not affected by adjustment of the belt, which is a distinct advantage in so far as we can really have the belt tight so as to obtain the best efficiency out of the fan, which we contend is an important feature. We are also running a similar belt on a 20-HP test car, and this belt has run approximately 5,000 miles. it being changed over from chassis to chassis. This belt is in better condition than the one returned, but this one also shows traces of slight cracks in similar places. We are continuing to run this belt. We are fitting a new one of the same type on the School car, and this time propose giving it a preliminary soaking in oil. We certainly feel that the experience with this belt is such that we can to advantage use it in place of the existing type, even although it may not be considered to have the life which we should like. EP.{G. Eric Platford - Chief Quality Engineer} | ||