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 side wheel carriers and dashboard brackets to prevent frame twisting on various chassis.
| Identifier | ExFiles\Box 103\5\ scan0106 | |
| Date | 10th March 1931 | |
| TO HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} FROM EV.{Ivan Evernden - coachwork} X.5600 EV{Ivan Evernden - coachwork}3/10.3.31. COPY TO R.{Sir Henry Royce} SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} BY.{R.W. Bailey - Chief Engineer} SIDE WHEEL CARRIERS. X.5600 X.7600 We thank you for our copy of Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}6/KT.5.3.31. After the 25th chassis in R.{Sir Henry Royce} series 20/25 HP. the rear engine foot is of such a design that it gives no torsional rigidity to the frame side member. There is a small steel bracket attaching the dashboard to the frame. We would be glad to know if this bracket is sufficient to prevent the frame from twisting due to the torsion of the side wheel carrier, by utilising the stiffness of the dashboard. If it is sufficient on the 20/25 HP. we suggest the same bracket be fitted to the Phantom II. in the place of the single cast-on bolt boss which it now has. We would also be glad if you would try a slightly better bracket as illustrated. We agree that stays from the top of the wheel carrier tubes to the dash can be used, and on N. sch. 2914, sent to you some 18 months ago, you have a suggested design. This will not be possible on and after N.2. series of P.II. or Japan III. as in these cases the bonnet overlaps the dashboard, hence the reason why we are anxious to use the dashboard to hold the frame side member from twisting. EV.{Ivan Evernden - coachwork} | ||