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 modifications for the front axle, spring links, and rear dumb irons.
| Identifier | WestWitteringFiles\F\January1921\ Scan79 | |
| Date | 1st January 1921 | |
| To DA.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} -2- E1/G27/1/21 Contd. Mr. Royce would like you to make a scheme of this suggestion. This drawing also shews that the front axle requires dropping a little more until the face of the spring pad is 2½" approximately below the centre of the road wheel. It is now desired to make the link for the rear end of the front spring .250 out of vertical, instead of .5. With regard to the rear dumb irons, these should be made of the same channel section pattern as the front, but stamped out to the required form and rivetted into the frame. The cross tube should be brazed into the rear dumb irons, and should be butted up to an extra thickness at each end, and have an internal-taper and thread machined in it, as per the attached sketch, into which the case hardened spring pin can be drawn by a central bolt. The schemes for the dumb irons therefore require revision in accordance with the information given. E.{Mr Elliott - Chief Engineer} | ||