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 optimal settings for torque reaction dampers and an investigation into engine detonations with different petrol types.
| Identifier | WestWitteringFiles\W\May1931-August1931\ Scan075 | |
| Date | 4th July 1931 | |
| COPY. To Hs.{Lord Ernest Hives - Chair} From GWH.{George W. Hancock - Head Chateauroux} Hotel de France, Chateauroux, Indre, France. 4.7.31. RE. TORQUE REACTION DAMPERS WITH DIAMOND ENGINE MOUNTING. We find the best setting for these dampers is 30 lbs. minimum and 40 lbs. maximum taken at a leverage of 5.25 inches. We should also recommend that the friction surfaces to be enlarged half as large again, and that it is necessary to have pressure plates strong enough so that they do not collapse. We find that with the present design using the single plates that they partially collapse and the load is not taken evenly on the surfaces of the friction washers. To overcome this we have fitted two pressure plates on either side, these do not then, with the load applied, collapse. The springs used on the damper are G.1564 which give a load of 200 lbs. when compressed to .700". The free length of the spring is .800". These springs are, from what I understand, not at present on production. They can be got from the Repair Dept. DETONATIONS. Re. detonations, we have tried so far the following different qualities of petrol - Tourisme, Essco, Shell and Standard. We have so far not been able to distinguish any difference in the slight detonations with any of these qualities of petrol. As has happened in previous cases the detonations can be avoided by retarding the ignition lever approx. 4 notches. (Signed). G.W.Hancock. | ||