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).
Letter to Rotax Motor Accessories Co. regarding the supply of parts for a Goshawk II starter motor.
| Identifier | ExFiles\Box 51\5\ Scan086 | |
| Date | 10th May 1921 | |
| X.4342 .R COPY FOR EFE Reference - DA {Bernard Day - Chassis Design} /THH1-10-21. May 10th, 1921. Messrs Rotax Motor Accessories Co.,Ltd. Rotax Works, Willesden Junction. N.W.10. X 4342 R Dear Sirs, Re Starter Motor for Goshawk II. Replying to your letter of the 20th, ultimo reference AGB/BH, we have gone further into this matter and have decided that it will be best if we supply the finished shaft and bearing bracket, also small parts which complete the motor, including six No. 2BA studs nut, and NE washers, which secure the bearing bracket to the motor casing, also the ball bearing and nut, distance bush and dust cover. To this end we enclose drawing D.50003 - Bearing Bracket and "N" Scheme 838 to which we have added a detail section of the tapping required for the securing studs, which are of the "fitted" type, as they have to take the driving torque as well as the weight of the motor frame. (No cradle, of course, is supplied with this motor). You will notice on drawing D.50003 several dimensions marked with an asterisk, which desire you to fill in to suit yourselves, it being possible that your standard motor casing has not a large enough section to take our 2BA securing studs in which case the outside diameter will have to be increased to accomodate these studs. Provided this diameter is not more then 4 1/4" this will be quite O.K. as far as we are concerned. We shall require a drawing giving full particulars of the motor end of the shaft, noted that we desire to have a shoulder on the shaft against which our distance bush butts. This shoulder can, within reason, be made to suit yourselves, but we require shaft drawing to give the dimension X on "N" Scheme 838. On receipt of this drawing with particulars we shall be able to complete the shaft contd. | ||