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).
Questioning the performance curve and running conditions of a 40/50 HP Dynamo.
| Identifier | ExFiles\Box 163\6\ img151 | |
| Date | 3rd June 1931 | |
| X6076 PN.{Mr Northey}1/WT3.6.31. X6126 X6016 RECEIVED 4 JUN 1931 -> Hs{Lord Ernest Hives - Chair}/CAP. Copy to Sg.{Arthur F. Sidgreaves - MD} W.Or. E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} Hy.{Tom Haldenby - Plant Engineer} 40/50 H.P. Dynamo. Referring to your Hs{Lord Ernest Hives - Chair}/CAP1/AD29.5.31. 40/50 H.P. Dynamo intended to be used on N.2 series. It is not clear to me why the curve No. 1 is shown in which a peak current up to 16½ amps is developed when on battery only, in view of the fact that with the two-switch scheme the conditions of running would be either :- (a) Resistance in field circuit, battery in circuit only, no lights on. (b) Resistance cut out of field circuit, headlights in use and battery on charge. The curve No. 1 would never be a help unless there were provided an additional point on the control-switch enabling the driver to overcharge his battery with no lamps on, in the way we wish to avoid. Probably the explanation is simply, but I fear at the moment it is not obvious, and shall be glad of your remarks. PN.{Mr Northey} | ||