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).
Test results and specifications for a low inertia 20 HP centrifugally loaded slipper wheel.
| Identifier | ExFiles\Box 137\4\ scan0084 | |
| Date | 25th March 1930 | |
| To E.{Mr Elliott - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} X634 Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}3/MJ.25.3.30. We promised to give you the dimensions of the low inertia 20 HP. centrifugally loaded slipper wheel so that you could modify the design according to results found to be desirable by test. The figures wehave so far obtained are as follows:- | Date. | Chassis | Mileage of Car when fitted | Miles run | Weight of Unit. | Driving Springs. | |---------|---------|----------------------------|-----------|-----------------|------------------| | 14.1.30 | 14-G4 | 12468 | 1398 | | E.54562 & E.71175| | Driving Spring Load. | Friction Springs. | Friction Load. | No.of Springs. | No. of Plungers. | Weight of Plungers. | |----------------------|-------------------|----------------|----------------|------------------|---------------------| | 9 lbs. | E.55496 | 8 lbs. | E.55489 4. | 4 Brass. | E.55490 2.250 ozs. | | Thickness of Fabric Washers. | RESULTS OF TEST. | REASON OF ALTERATION. | |------------------------------|-------------------------------------------------------------------------------|---------------------------------------------------------------------------| | | Very good for absence of crankshaft periods, no engine gear rattles, no bus knocks. | To lessen centrifugal load at high speed thus making the engine smoother. | Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||