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).
Drawing No. Lec 1570, detailing a longer Goshawk II dumb iron with larger bolts and rivets.
| Identifier | WestWitteringFiles\I\May1922\ Scan30 | |
| Date | 10th May 1922 | |
| To Ba. from E.{Mr Elliott - Chief Engineer} c.c. to Gd. Wor{Arthur Wormald - General Works Manager}- c. to By.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair} Hy.{Tom Haldenby - Plant Engineer} Hs{Lord Ernest Hives - Chair} ORIGINAL REC'D 11. MAY 13 GOSHAWK 11. DUMB IRON. X4260 We send you herewith drawing No. Lec 1570 shewing Goshawk ll. 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 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} | ||