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).
Effect of reducing field resistance on 20/25 dynamos.
| Identifier | ExFiles\Box 60\4\ Scan159 | |
| Date | 1st April 1932 | |
| FN. from Hs{Lord Ernest Hives - Chair}/Wst. C. E.{Mr Elliott - Chief Engineer} C. Ey. C. Wor.{Arthur Wormald - General Works Manager} Sr. X6099 Hs{Lord Ernest Hives - Chair}/Wst.4/ADMS.4.32. 20/25 DYNAMOS. With regard to your request for particulars of the effect on the half-charge scheme by reducing the amount of field resistance. We found that by reducing the length 11" (approx 1/2) the cutting in speed of the dynamo was reduced to about 15 M.P.H. in the day running position and the maximum peak output in the day running condition increased by approx. 1 1/2 amperes to 11 amperes. The dynamo is perfectly safe as regards heating in this condition. Hs{Lord Ernest Hives - Chair}/Wst. | ||