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).
The performance curves and continuous running tests of standard and experimental dynamos.
| Identifier | WestWitteringFiles\J\May1923\ Scan74 | |
| Date | 28th May 1923 | |
| Contd. -2- EFCX/T28.5.23. These curves for the standard machines are therefore now representative of the typical performance of these dynamos in the best condition of brush position and corresponding commutation which we know. No further general improvement is now considered likely. As regards the curve for the 20 S.W.G. field winding, it will be seen that no advantage is gained. This was also the case with the experimental machine with thicker carcase and smaller air gap. The curve for this machine is not given as it is not considered strictly comparative, owing to its having to be tried on an old machine more or less patched up for the job. Further work now in hand on the Goshawk dynamo consists only of a continuous running test (direct coupled motor driven). At present the speed of running is 1750 r.p.m. and the equivalent of 5000 miles at this speed is being performed. Subsequently the equivalent of 5000 miles will also be run at each of the speeds 2500 and 3500 r.p.m. The commutation in this continuous run, as also during the tests of which the curves were taken, is and has been satisfactory. Upon completion of these continuous runs with the standard machine, we have a number of brushes in other materials to be similarly tried. This continuous running is going on independently of other dynamo tests. Therefore, we are now in a position (i.e. until the E.A.C. dynamo comes along for experimental test) to | ||