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).
Comparison of different starter motor arrangements, including C.A.V., Bendix, and flywheel types.
| Identifier | ExFiles\Box 61b\3\ scan0154 | |
| Date | 18th February 1922 | |
| Contd. -2- R2/M18.2.22. carry the motor thoroughly well. The C.A.V. is a better scheme than the Bendix, being magnetically engaged teeth and spiral keys combination. It will be noticed that the motor speed at full load, say 10 V 150 A must be low, i.e. 500 to 700; the motor therefore will not be so efficiency as with the higher speed motor, used in the RR. arrangement. The whole trouble must be met by having batteries in good condition, and a starting (priming) system, which will give a certain start with a low engine speed, as is required also for hand starting, in case the battery is down. I hope with my other letter, this will clear this matter up. You will notice that I do not object to flywheel starter, if with maximum possible gear ratio, and large slow speed motor, but I do not consider this arrangement has any real advantage over our gearbox arrangement in which we gain the lower lost in the gearbox in the increased efficiency of the higher speed motor, and the press button scheme is rather nicer, but more costly. | ||