Bench test report on the Lucas E.5.R.R. (S.F.) Dynamo for the Goshawk engine.
| Identifier | WestWitteringFiles\G\October1921\ Scan19 | |
| Date | 18th October 1921 | |
| To: Mr. Ellor c. CJ. & FN. c. Ry. & EP. {G. Eric Platford - Chief Quality Engineer} c. RO. {C. C. Rose - Export Manager} & Da. {Bernard Day - Chassis Design} c. R.R. of America Inc. ORIGINAL EPCL/T18.10.21. X.4359L - LUCAS E.5.R.R. (S.F.) DYNAMO FOR GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)). We have now made bench tests of the second sample Lucas dynamo for Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) which we will call as above, to distinguish this from the first, "S.F." standing for "single field winding". The output characteristics obtained for this machine for the cold and hot conditions respectively, with makers brush setting, are shown on the accompanying photostat, and it will be seen that in respect of output alone the machine readily complies with the specification. The hot characteristic was taken at 83°C, carcase temperature, i.e. near the limit of 85°C which we have fixed. If, however, the machine be run on the peak of output, the temperature will exceed 85°C, and in this respect, therefore, the machine will not comply with the specification, at makers brush setting. Having taken the output curve with this brush setting, it will now be necessary to retard the third brush a little until the machine will carry the peak output indefinitely without exceeding 85°C. Further output curves will then be taken in this condition, and there is little doubt that the output, although somewhat reduced, will still comply. We do not find the variation due to varying third brush contact to be at all unsatisfactory. Messrs. Lucas have arranged a rather narrower brush than standard for this work. This seems right, as in any case, the brush does not have to R R B' 337V (100 L) (2 H' 88" 10-13-30) C 3941 | ||
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).