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).
Discrepancy in dynamo output and recommending changing from 60 watt to 36 watt headlamp bulbs.
| Identifier | ExFiles\Box 62\3\ scan0258 | |
| Date | 20th November 1931 | |
| X6005 G.W.Hancock from Hs{Lord Ernest Hives - Chair}/Wst. Hotel de France, Chateauroux, Indre, France. Hs{Lord Ernest Hives - Chair}/Wst.4/AD20.11.31. 18-GIV DYNAMO OUTPUT* We are unable to understand how it is that the dynamo charge has altered. Referring to your figures we note that you get 7 amperes charge. Allowing say 1 ampere for battery ignition load, this would mean a peak output of roughly 8 amperes whereas on our bench tests of this machine we got 11.5 amperes. With the low output you show using 60 watt headlamps bulbs there is bound to be a discharge and we recommend that you change the lamp bulbs for 36 watt, two of which we are sending out to you. We should also be interested to have your opinion as to what percentage of extra driving light you estimate you obtain with 60 watt lamps against 36 watt. Hs{Lord Ernest Hives - Chair}/Wst. | ||