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).
Modifications to the dynamo charging system and electrical switch connections.
| Identifier | ExFiles\Box 59\1\ Scan175 | |
| Date | 11th November 1927 guessed | |
| -2- Contd. The elimination of the tendency to vibrator regulator action is completely effected - the switch goes over with a definite snap and with the amount of resistance referred to above, with which we have experimented, the cutting in speed of the machine with this in series with the field is raised to 2700 r.p.m., corresponding to in the 20 HP. case to about 38 m.p.h. For a large proportion of the running therefore, the dynamo would be entirely off charge. Charging at moderate speeds would not then resume until the main charging switch is put off, even if the car is stopped by some other means than switching off the ignition. At high speeds above 38 m.p.h. a very small charge would be given. It would be possible to make this resistance still higher and put the charge entirely outside the working range, but it is not desirable from the point of view of sparking at the contact, and we may even decide that a slightly smaller value than we have at present is better from this point of view. Some further consideration has been given to the positive connections of the cutout and the auto switch shunt coils, i.e. as to whether they should be connected to B. or C of the distribution box (see diagram previously sent). We have finally decided that - (1) Cutout shunt connected to B. (as at present standard) with auto switch shunt connected to C is definitely wrong, and that there is very little in it between - | ||