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).
Drawings for a longer front dumb iron fixing for the Goshawk 11 model.
| Identifier | ExFiles\Box 75\3\ scan0337 | |
| Date | 26th January 1922 | |
| To Da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} c. to CJ. c. to Wor.{Arthur Wormald - General Works Manager} c. to By.{R.W. Bailey - Chief Engineer} c. to Hs.{Lord Ernest Hives - Chair} X4260 E1/M26.1.22. GOSHAWK 11. LONGER FRONT DUMB IRON FIXING. X.4260. 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 | ||