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).
Suitability of C.A.V., Smith, and Rotax starter motors for the 'Goshawk II' engine.
| Identifier | ExFiles\Box 51\5\ Scan023 | |
| Date | 9th July 1921 | |
| X4342 To R. {Sir Henry Royce} from EPC. c. to CJ. c. to E. {Mr Elliott - Chief Engineer} c. to By. {R.W. Bailey - Chief Engineer} c. to Ds. c. to Ds/Thr. c. to By {R.W. Bailey - Chief Engineer} /WER. EFC {E. Fowler Clarke - Electrical Engineer} 1/T9.7.21. X.4342 - STARTER MOTORS OF OTHER MAKES FOR 'GOSHAWK II' We are sending you herewith, in accordance with your request, prints showing a starter motor outline for the C.A.V. type SC, and for the Smith 5S motor. C.A.V. Type SC Motor. This motor is considered by the makers (which is also evident from examination of the curves of this machine) to be very easily capable of starting the Goshawk engine. So much so that Messrs. C.A.V. have even suggested the use of anothers of their types of motor still smaller, but it was finally decided between us and them that this would not be advisable. Smith Type 5S Motor. Messrs. Smith have on several occasions stated to us that they do not think this motor large enough for properly starting the Goshawk II engine, and are supplying it to us as such, merely for purposes of experiment. It has been previously suggested that this motor should be lengthened, but R. {Sir Henry Royce} has decided that we would not have this done, but try out the motor as it is. Rotax M.T.1.L. Motor. It was at first thought from dimensions given in the Rotax catalogue (which afterwards proved to be incorrect) that this motor would not go into position without fouling the crankcase breather, and on our informing Mr. Royce of this fact during our visit, he decided that this motor should be struck off the list. Latterly, however, it has been found that the motor will go in, and we suggested to Mr. Royce in our EFC {E. Fowler Clarke - Electrical Engineer} 4/T7.6.21 that we should go ahead with this motor, (will E. {Mr Elliott - Chief Engineer} also kindly refer to our EFC {E. Fowler Clarke - Electrical Engineer} 1/T28.6.21.) At present the matter of the motor is in abeyance pending this decision. Contd. | ||