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).
Potential alterations to the design and output of car dynamos.
| Identifier | WestWitteringFiles\S\2April1928-June1928\ Scan038 | |
| Date | 18th April 1928 | |
| EFC. ) FROM R.{Sir Henry Royce} HS.{Lord Ernest Hives - Chair} ) (At Le CanadelHenry Royce's French residence.) BY.{R.W. Bailey - Chief Engineer} ) C. to BJ. WOR.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} C. SG.{Arthur F. Sidgreaves - MD} CAR DYNAMOS. OUTPUT. 2 R2/M18.4.28. REC'D AT WW. & DESPATCHED 21. 4. 28. X.8664 X8663 ORIGINAL I think there is little doubt that we ought not to alter the size of the machine, but - (1) We ought to arrange the dynamo with less fall in output with speed, (especially if we have charge indicator). (2) Next we ought to have a second type of armature cutting in later and giving greater output. With (1) I should think that 1/3rd later and proportionately more current would be good, and with less fall, and perhaps naturally later fall, the average high speed amperes might be 40% to 50% more than at present, and sufficient to hold the charge with any headlamps that should be needed. I have pointed out many times - without results - that some current could be saved if our side lights took less amperes, and very effectively because they are on for a long time - (they are too powerful now.) Regarding the number of slots and coils I should prefer that you kept to the 28 standard. The difference between this and 26 is so little, and the manufacturing would be so much less costly with the same number of sections. Altering the turns from 4 to 3. The coarser wire must be got in even if slightly wider slots are necessary; the commutators would be the same for each. R.{Sir Henry Royce} | ||