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 observation of a Remy 6 cylinder contact breaker's motion at various speeds.
| Identifier | ExFiles\Box 52\3\ Scan317 | |
| Date | 19th December 1917 | |
| To R. {Sir Henry Royce} from EFC. {E. Fowler Clarke - Electrical Engineer} c. to BJ. c. to BJ for OY. c. to BY. {R.W. Bailey - Chief Engineer} c. to DA. {Bernard Day - Chassis Design} c. to EP. {G. Eric Platford - Chief Quality Engineer} X.2814. INSTANTANEOUS VISION OBSERVATION OF REMY 6 CYLINDER CONTACT BREAKER. The above was carried out by driving the Remy 12 and the Remy 6 contact breakers at the same time coupled to one another by a chain drive in such a manner that the number of breaks per second on the two breakers was the same, that is to say Remy 6 was driven exactly twice as fast as Remy 12. The Remy 6 coil was connected to the Remy 12 contact breaker and supplied the spark for the instantaneous vision of the Remy 6 contact breaker. The necessary variation of phase could be obtained by advancing or retarding either contact breaker, but it was more convenient to do the whole variation on the Remy 12. It was found to be better to use only one contact breaker on the Remy 12, and the other one was therefore rendered inoperative. The motion of the Remy contact breaker could be very distinctly followed and the results came out as below. Up to a speed of about 1300 R.P.M. the motion was, as far as could be judged the same as for dead slow. At 1330 R.P.M. it began to be seen that the fibre block was just on the point of leaving the cam, that is to say, it was jumping and riding through the air for a short distance. At a speed of 1540 R.P.M., the maximum CONTD. | ||