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).
Axle frequency, shock absorber performance, and front brake squeaking issues.
| Identifier | ExFiles\Box 41\1\ Scan095 | |
| Date | 8th December 1926 | |
| Oy2-E-12826 -2- December 8th, 1926. (2) It seems to be the natural criss-cross frequency of the axle, set in motion by road irregularities. It is definitely much less severe on a smooth concrete road than on a rough road, but is just as evident on wet roads as on dry. Above 50 m.p.h. on a roughish road it builds up to a disagree-able extent, shaking the radiator, bonnet and mascot violently, but does not disturb the steering. Our first R.R. hydraulic shock absorbers do not cure it complete-ly, but one of them appears to have considerable leakage past the piston. We have not received the second set. We tried mounting additional R.R. friction type shock absorbers on the axle with the arms vertically upward and linked to the frame either side, in order to damp the tramping only, but so far have done no good. Can you offer any suggestions? (3) The squeaking of the front brakes (on the model axle you sent us) is worse than anything we have heard on a rear axle. Have you any damper scheme for these drums? Yours very truly, Maurice Olley MO/E | ||