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).
Experiments and conclusions regarding the measurement of engine detonation and the potential use of a strobophonometer.
| Identifier | ExFiles\Box 165\4\ img169 | |
| Date | 8th September 1932 | |
| Hs{Lord Ernest Hives - Chair}/Ud.4/AD8.9.32. contd. -3- If conditions are now changed so that detonation commences the start of detonation will be indicated by an increase in the scale reading. By a somewhat long process of experiment it would be possible to determine the scale reading which corresponds to an intensity of detonation which results in damage to the cylinder. The result of this experiment would be applicable only to the form of cylinder construction tested and the work would have to be repeated for any other form of cylinder. The work could not be done on a single cylinder test unit as the vibrations in the jackets of a single and multicylinder engine produced by a particular set of detonating conditions would not be identical. Conclusions. In view of the difficulty in obtaining a satisfactory measure of detonation the strobophonometer, being simple and easily attached to an engine, should be distinctly useful. It has not yet been tried on a twelve cylinder engine but Mr. Stansfield would be pleased to visit Derby with the instrument and demonstrate it on a 12 cylinder engine. The price of the instrument is approximately £80. Hs{Lord Ernest Hives - Chair}/Ud. | ||