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).
Anxiety from the Sales department regarding dynamo output and exploring potential improvements.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan099 | |
| Date | 5th February 1929 | |
| To R.{Sir Henry Royce} from EFC. c. SG.{Arthur F. Sidgreaves - MD} CWB. c. Cx.{Major Len W. Cox - Advertising Manager} PN.{Mr Northey} c. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} ORIGINAL EFC1/T5.2.29. x8664 x77660 DYNAMO OUTPUT. Further to our EFC2/T1.2.29, there appears to be some anxiety on the part of Sales in regard to the output of our dynamos in view of their contention that there is an increasing demand for electrical current on the cars. From a note we have received from PN.{Mr Northey} we gather that they consider it an appreciable disadvantage that the higher output machine cutting-in is over 200 dynamo r.p.m. later. We find that 1000 r.p.m. of the engine corresponds in the SS.{S. Smith} case to 26.23 m.p.h. in place of 28.74 m.p.h. as previously, so that the exact increase in dynamo speed is 9.4% greater than previously. This makes up for rather less than one quarter of the difference and therefore perhaps not as much as might at first sight be thought. As we have previously observed, the output of our present standard machine is rather considerably limited by the fact that we must be safe from overheating in continuous overcharging and high voltage circumstances. If that condition did not exist for any appreciable time, the output of even present standard machines would be materially increased without loss of cutting in. It is probable that the use of the green lamp indicator would enable us to increase the output, say about 1 1/2 to 2 amperes on the peak, with safety. Alternatively, by adding several more lbs. weight to the dynamo, i.e. by increasing the length or preferably the diameter, we could make a machine which would give the required degree of higher | ||