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).
Experiments to improve peak output by modifying armature length and winding specifications.
| Identifier | ExFiles\Box 179b\2\ img212 | |
| Date | 17th December 1932 | |
| -2- Hs{Lord Ernest Hives - Chair}/Wst.2/MA.17.12.32. Cont'd.{John DeLooze - Company Secretary} With our experiments with a view to improving this peak output without materially affecting the cutting in speed. It might be useful to shorten the armature slightly i.e. go back about half the distance we have gained over the existing 20/25 machine. This will reduce the resistance in the winding. We also consider trying 18 S.W.G. wire in the armature instead of 17 in order to still further improve the sparking at high speeds, but we cannot use 18 S.W.G. wire unless we shorten the armature core appreciably and so reduce the resistance. We will advise you at a later date the results of our experiments on this machine. We suggest, therefore, that the machines we have in hand and which we have instructed RIC. to temporarily hold up should be modified by reducing the armature, increasing the pole core lengths and winding on the new field winding as per our figures quoted above. Hs{Lord Ernest Hives - Chair}/Wst. | ||