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).
Essential points and investigations for the 40/50 HP Slipper Flywheel.
| Identifier | ExFiles\Box 74\2\ scan0296 | |
| Date | 6th June 1923 | |
| X3439 BY.{R.W. Bailey - Chief Engineer} c. to Hs.{Lord Ernest Hives - Chair} c. to Sft.{Mr Swift} c. to Shn. EP{G. Eric Platford - Chief Quality Engineer}/HS.{Lord Ernest Hives - Chair}6.6.23. re. 40/50 HP. SLIPPER FLY WHEEL. With further reference to our memo EP{G. Eric Platford - Chief Quality Engineer}4/H9.4.23, and your memo BY20/P4.6.23, we have for some time been making investigations as to the best results which can be obtained from the 40/50 Slipper Flywheel in co-operation with Hs.{Lord Ernest Hives - Chair} We find that the following points are essential and shall be glad if you will arrange for these to be definitely instructed for on future production. We should at the same time be able to get the Works to correct the slipper wheels which are not satisfactory on cars on test or which come into our hands:- 1. Burnishing and polishing of the slipper flywheel friction surfaces is essential. We have found that this has a very important bearing on the satisfactory action of the slipper flywheel. Apart from the running in which is now being given, it is essential that some satisfactory surface should be obtained on the fibre discs, and that they should not be bedding on spots or on the corners of the fibre. The friction surfaces must be parallel and square with the bore, and the amount of friction at all positions must be the same. 2. The bore of the flywheel Should be a satisfactory free, although close fit on the spigot of the hub, and there should be no eccentricity at this point. The object to be attained is that the slipper flywheel should be perfectly smooth in action, i.e. not "jerky" or "lumpy" when turned by hand. The bore of this flywheel should be whitemetalled similar to the 20-HP, so as to reduce the tendency for seizing up. 3. The friction moment of the slipper flywheel when attended to as specified in 1. and 2. and built up with the friction surfaces well oiled with standard engine oil, should be between 17 Lbs. minimum and 25 Lbs. maximum at 17 1/2" lever. 4. We feel that this is more satisfactorily obtained by using double the quantity of studs and springs that is being used at present. EP.{G. Eric Platford - Chief Quality Engineer} | ||