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 of the Goshawk 11 dumb iron, using larger bolts and rivets.
| Identifier | ExFiles\Box 75\3\ scan0342 | |
| Date | 10th May 1922 | |
| X4260 Da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} c. to CJ. Wor.{Arthur Wormald - General Works Manager} c. to BY.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair} EP.{G. Eric Platford - Chief Quality Engineer} E1/M10.5.22. GOSHAWK 11. DUMB IRON X.4260. We send you herewith drawing No. LeC.1570 shewing Goshawk 11. dumb iron 15% longer than LeC.1525 as before, but with larger bolts and rivets. By using at the front end a combination of bolt and rivet we can get in a plain taper bolt with hole reamered from the outside. It necessitates the use of a special spanner for tightening the nut but this does not matter in the slightest as the spanner will only be required by the frame assemblers. The bolts and rivets shewn are of .375 diameter. We do not agree with By.{R.W. Bailey - Chief Engineer} that it is necessary to go to 1/4" as these larger rivets would overpower the thin materials we are fastening together. The rivets have been made with round noses on the shanks to allow them to be got in from the inside and yet be long enough to provide the necessary material for riveting. The dumb iron stamping has been drawn slightly longer than LeC.1559, as although the base of the joint of the frame remains the same length between centres it has been necessary to provide the a little more room for the increased size of bolts and rivets. It will be seen that the bolt at the front may equally well be used for the lower flange of the frame and the rivet at the top, but after weighing the matter up it was thought on the whole better to have the bolt at the top. E.{Mr Elliott - Chief Engineer} | ||