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).
Body troubles, spring rates, and damper schemes for car 15.EX.
| Identifier | ExFiles\Box 12\3\ X704-0096 | |
| Date | 9th March 1928 | |
| to Hs{Lord Ernest Hives - Chair}/ Rm.{William Robotham - Chief Engineer} From EV.{Ivan Evernden - coachwork} EV{Ivan Evernden - coachwork}2/9.3.28. copy to [symbol] Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer} RE 15. EX. Y7830 Except for a few general remarks on coachwork which have appeared in several reports, we have received no detailed information as to what exactly were the body troubles on this car. Apparently you could not use the 50lbs. springs for the front body supports and that, for the test, you pulled the body down almost rigidly to the chassis. There is little wonder that the panels are cracked at the corners of the doors. Did you try the 75lbs. & 100lbs. springs? Mr Royce's car has the 100lbs. springs and this appears to be fairly satisfactory. It is essential that we should be told, in detail, of the trouble experienced with the front supports of 15EX. This and other subframe cars which you have at Derby should be tried with the various springs we have given out. We have never had any report on the scuttle and dash friction damper suggested by Mr Royce. The scheme has worked well on the car he has and on 10.G.3. now at W.W., yet I presume that you could not make it satisfactory on 15.EX. It has the virtue that it allows the fore and aft pumping to take place between the scuttle and the dash, and controls the transverse movement. Apparently you abandoned this scheme in favour of a semi-isolation system because you wanted the body to hold the dash steady at the top. If the body is to be flexibly mounted, we cannot look to the scuttle to stiffen the dash. | ||