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).
Report analysing the performance characteristics of an intermediate output dynamo curve.
| Identifier | ExFiles\Box 165\6\ img240 | |
| Date | 14th December 1929 | |
| EFC2/A14.12.29. contd. -7- It will be noted that the intermediate output curve is quite a good curve with the exception of its rate of fall at high speeds which is rather more than in the other two cases. This point is being investigated, and it has been found so far, that control brush spring pressure may have some bearing on the slope. The curve has an output area between 15 and 23 miles per hour not possessed by either of the other two. A point has been arrived at by my assistant Mr. Allen that there is for every output curve, and also from curve to curve, a point which represents the greatest output in ampere hours per mile. This point is arrived at by drawing from the origin a tangent to the curve as shown, contacting with it at the point P. The appearance of this is such that it seems probable that the curve for the intermediate output machine is very nearly that one which actually will give the greatest number of ampere hours per mile, the speed at which it gives it being almost exactly 26 miles per hour. In the event of using only one arrangement of dynamo for the 20 HP. this machine of intermediate output would appear to be a very good proposition. The curves shown on the blue print for 40/50 HP. comprise :- Firstly, specified curve of output requirements for 40/50 HP. dynamo as originally considered O.K. | ||