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).
Vibration control, dynamo commutator sparking, and regulator mounting arrangements.
| Identifier | ExFiles\Box 179b\2\ img144 | |
| Date | 8th November 1938 | |
| ORIGINAL R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Wst. C. to Hy.{Tom Haldenby - Plant Engineer} C. to E.{Mr Elliott - Chief Engineer} C. to R.{Sir Henry Royce} C. to WOP. C. to PL. Hs{Lord Ernest Hives - Chair}/Wst.15/WA.{Mr Wallis} 8.11.38. X6092 VIBRATION CONTROL. Answering your R.S/M.19.11.38., we have appreciated the point you referto regarding the mounting of the regulator and we have arranged for them to be mounted horizontally on the chassis. With regard to the degree of sparking on the dynamo commutator we have observed that it is possible with a discharged battery for the shunt dynamo to be generating its full output at high speeds thus requiring a different main brush setting that the present third brush dynamo whose output falls with speed. We are accordingly carrying out a number of experiments with various field windings, taper poles and varying brush settings in order to arrive at the most sparkless high speed commutation without any appreciable loss in cutting in speed etc. The previous dynamo failure on 17-MK.{R. E. B. Meade-King} on the inst 40/50 10,000 mile test where the dynamo was habitually run at high speeds may have been caused by incorrect brush setting causing the commutator to heat up due to sparking. The high speed problem will be more severe on the Peregrine and Kestrel as on the former at max. engine revs. the dynamo will be running at 7,500 R.P.M! Hs{Lord Ernest Hives - Chair}/met. | ||