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).
Ordering and modification requirements for Goshawk II starter motors supplied by C.A.V., Smith, and Rotax.
| Identifier | ExFiles\Box 51\5\ Scan007 | |
| Date | 5th May 1921 | |
| To DA {Bernard Day - Chassis Design} /THT. C. to EFC. {E. Fowler Clarke - Electrical Engineer} X 4342 BY {R.W. Bailey - Chief Engineer} /WER1/EF9. 5. 21. X 4342 "GOSHAWK" II. STARTER MOTORS. Re. Ordering of Modified C.A.V., Smith and Rotax Motors. Referring to your "N" Scheme 838 which shews the 4.500 diameter Motors (C.A.V. and Smith) as stated thereon R.R. will produce the Shaft and Bearing Bracket, also the small parts which complete the Motor including the 6 - 2 B.A. Studs, Nuts and Washers which screw the Bearing Bracket to the Motor casing. We shall require a drawing giving full particulars of the Motor End of the shaft and it will be noted that we desire to have a shoulder on the shaft against which our Distance Bush butts up. This shoulder the Motor Makers can within reason suit themselves but we require their Shaft drawing to give the dimension X on the "N" Scheme. It will be seen that we have added to the "N" Scheme a detailed section of the tapping required for the Securing Studs, these Studs are of the "fitted" type and therefore the centres of tapping must of course be accurate. Please receive herewith two blue prints of D. {John DeLooze - Company Secretary} 50002 Bearing Bracket for the 4.500 diameter Motors. The dimensions marked with an asterisk we desire the outside firms to fill in to suit themselves, as it is possible that their standard Motor Casing has not a large enough section to permit of us using 2 B.A. Securing Studs, in which case the outside diameter may have to be increased to accomodate these Studs. Providing that this diameter is not more than 4.750 this will be quite O.K. as far as we are concerned. Regarding your "N" Scheme 839 which shews the 4.125 diameter Motor (Rotax) the above remarks apply to this except that the Bearing Bracket is D. {John DeLooze - Company Secretary} 50003 of which please receive one blue print. C.A.V. Regarding Messrs. Vandervells print 5325 this shews only one Terminal leading away from the machine. Presumably this Motor is of the "Earthed" type, we of course require this machine to be of the "Insulated Return" type, and also we wish to know where the additional Terminal comes out of the Motor Casing. Again referring to their blue print and in particular the two screws which run through the length of the machine on the horizontal centre line and screw in the End Bracket, by inspecting our drawing D. {John DeLooze - Company Secretary} 50002 they will doubtless appreciate our difficulty in providing bosses into which to tap. Can they alter their design in order to overcome this difficulty. Smith. We presume that it is too obvious a fact to point out to these people that we do not require a Cradle with this Motor. Perhaps you will point out to the Motor Makers that R.R. (Contd.) 5000 11-12-21 250 H. {Arthur M. Hanbury - Head Complaints} S. (P.P.) LTD. N/T. | ||