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).
Design and features of a proposed bonnet fastener.
| Identifier | ExFiles\Box 25\1\ Scan145 | |
| Date | 23th May 1933 | |
| XII 40 To Sft.{Mr Swift} from E.{Mr Elliott - Chief Engineer} c. Wer. Hs.{Lord Ernest Hives - Chair} By.{R.W. Bailey - Chief Engineer} E.6/HP.23.5.33. Rm{William Robotham - Chief Engineer} re Proposed Bonnet Fasteners. Replying to your memo Sft.{Mr Swift}3/DH.{D. Henderson - Showroom}19.5.33, we are interested to notice the features of the proposed bonnet fastener of which you attached a drawing. We agree with you that we do not like the idea of the grub screw, but in addition to that there are two further points we should like to raise: Firstly, there is nothing to stabilize the fastener sideways when operating it. We think unless some guide to give this control is included it will tend to fall over sideways under the pressure of the hand. Secondly, the inlooking boss which protrudes through the face of the fastener where it is fixed to the bonnet makes this face rather difficult to clean up, but presumably could be dealt with by making the piece a dixtampo casting. Strangely enough we made a somewhat similar design some time ago along similar lines shown on the attached blueprint, LeC.3103. We never issued this because there were other schemes on foot at the time, but we should like to have your opinion of it as a production job. On LeC.3103 the fastener is prevented from falling over sideways by the square bar engaging the sides of the slot in the flat plate fixed on the inside of the bonnet. This feature also prevents the bonnet fastener rotating. We return herewith drawing of bonnet fastener. E.{Mr Elliott - Chief Engineer} | ||