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 load requirements and mechanics for the magneto and distributor control system, including diagrams.
| Identifier | WestWitteringFiles\O\2January1926-March1926\ Scan110 | |
| Date | 15th January 1926 guessed | |
| contd :- -5- the load required to advance the magneto and distributor was determined. This appears to be 26 lbs. whether the engine is stationary or running, the stiction with the engine stationary being counter-balanced by the fact that when running the cam action tends to retard the magneto all the time. The conditions is therefore that with 15 lbs/sq.in. oil pressure, the relay can only just operate the controls under normal conditions if no return is fitted above the pressure piston. Now in order that the hand control of the magneto can operate satisfactorily, the return spring must have a minimum load of 10 lbs. on the piston of the relay. The reason for this is as follows. When the hand quadrant is moved to the fully advanced position, the magneto is advanced and rods X. and Y. are in compression. Lever A.{Mr Adams} is pushed against a stop. When the hand control is retarded, on the contrary, in order to retard the magnetos, rods X. and Y. are in tension and kxxxxxx lever A.{Mr Adams} tends to move away from the stop. Now unless there is some force tending to keep lever A.{Mr Adams} in its position which is greater than the force exerted in rod X. due to the resistance contd :- | ||