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).
Consideration of a combined starter and dynamo versus separate units.
Identifier | ExFiles\Box 48\3\ Scan309 | |
Date | 17th November 1920 | |
X4216 To EFC. {E. Fowler Clarke - Electrical Engineer} from Da. {Bernard Day - Chassis Design} c. to Hs. {Lord Ernest Hives - Chair} c. to Bn. {W.O. Bentley / Mr Barrington} Da {Bernard Day - Chassis Design} 3/CB17.11.20. X.543. X.950. X.3374. X.294. X.4216. - Re Combined Starter and Dynamo. With reference to your EFC {E. Fowler Clarke - Electrical Engineer} 3/T17.11.20, I have not yet seen the blue prints, but I should like to advise you that this question of using a combined starter and dynamo and two separate machines was fully considered by Mr. Royce about a year before the war, and there is a considerable amount of correspondence about it in the experimental files. I certainly think it would be advisable to have this correspondence looked up before you submit this proposal to Mr. Royce, because the conclusion that he came to, after everybody in the firm, I think, had expressed an opinion, was that two separate machines was a lighter proposition than the single combined machine. X.950. At that same time we had before us a "Scott" combined dynamo and motor, which had an epicyclic gear attached to the machine, which caused it to run at engine speed, or rather more, as a dynamo, and about 20 times engine speed as a motor. Mr. Royce turned down this particular machine because the design of the epicyclic gear was bad, and also the electrical work was not as good as he desired, but his main reason for turning the combined scheme down as a whole, was an electrical one, having reference to weight and heat. Da. {Bernard Day - Chassis Design} | ||