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).
Two fixing schemes for the Goshawk 11 longer front dumb iron, referencing drawings LeC.1524 and LeC.1525.
| Identifier | WestWitteringFiles\H\January1922\ Scan21 | |
| Date | 26th January 1922 | |
| COPY ORIGINAL To. Da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} c.c. OJ. WOR.{Arthur Wormald - General Works Manager} BY & Hs.{Lord Ernest Hives - Chair} E1/M26.1.22. GOSHAWK 11. LONGER FRONT DUMB IRON FIXING. We send you herewith drawings Nos. LeC.1524, and 1525 dealing with the above. LeC.1525 - Dumb Iron - will go into the standard side channel unaltered, and consists of a scheme in which the front end of the fixing is secured by means of taper ferrules with bolts through the centre, and the rear end of the fixing is made with 5/16" rivets. The taper ferrules have a virtue of allowing the bolts to be got into position and of leaving accommodation for length of thread on the bolt stems. With regard to the rivets, it is hoped that the increased size will result in a better job. Two schemes are shewn on LeC.1525, one having quarter bolts and the other having 5/16" bolts. In each the shear area of the ferrule should be equivalent to a .312 solid section. The quarter bolts should be tested on the bumping rig, with a view to standardisation, but if they do not stand up, the holes should be enlarged, and the larger ferrules, and the 5/16" bolts used instead. Referring now to drawing LeC.1524, the profile of the side channel has been very slightly altered to give a parallel face top and bottom at the front end of the fixing enabling a single bolt to be used. You may very likely find it possible to adapt this to existing side channels. It was not thought that a taper bolt alone could be got a tight fit in the hole from the end to end, hence the use of a taper bush at the nut end. To summarise, Mr Royce would like the quarter bolt scheme standardised on LeC.1525, with the 5/16" bolt scheme or the same patterns in reserve in case of trouble, and he would like scheme LeC.1524 tested also. Hs{Lord Ernest Hives - Chair} E.{Mr Elliott - Chief Engineer} RECEIVED MAR 4 1922 | ||