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).
Page 3 of a report detailing modifications and test results for body mounting and frame damping.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan126 | |
| Date | 8th February 1929 guessed | |
| contd :- -3- (7) Our next modification was to single point mount the body in front, prevent it swaying by having light rubber control under the front subframe feet, and connecting the scuttle to the dash with normal semi isolation rubber bolts. This left but little radiator movement. The body was remarkably free from torque reaction and booming. (8) With the car as in (7) the cross rigidity was removed by taking off the top centre plates. Practically speaking, in this condition, radiator shimmy vanishes. (9) With the cross still weakened, the normal body subframe mounting was reverted to. The car in this condition was very similar to stage (7) but not so good as stage (8). In addition to the above tests we have established that removing the tie rods is slightly beneficial to the trouble and increasing the cross steering tube friction is also an improvement. The dampers behind the gearbox make a slight improvement when tightened up. We have tabulated our results as far as possible as otherwise the results become rather involved. We have been conducting tests in parallel on the 20 HP. car, but so far it has shewn itself to be less amenable to modifications than the S8. We have done some tests with the static frame on the 20 HP. in the same manner as previously carried out on the 40/50, and the attached curves shew that we have lost quite a lot of frame damping in going from G.lll. to G.lV. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||