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).
Tests conducted on Bentley front axles to address 'tramping' by adjusting front shock damper loads.
| Identifier | ExFiles\Box 84\2\ scan0215 | |
| Date | 11th December 1934 | |
| To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/W.Brazier. X206 11.12.34. "TRAMPING" OF BENTLEY FRONT AXLES. Tests taken on B.1.V. have proved that with increased front shock damper loads there is less tendency for the car to "tramp". With shock damper loadings of 30, 70, 105, 150, and 200 lbs/sq.in., and with a Wilmot Breedon bumper bar, we obtained the following results. While it was possible to "tramp" the car easily (with or without bumper bar) at 30 and 70 lbs/sq.in. damper loads, we have been unable to do so at 150 and 200 lbs/sq.in. In the medium position of 105 lbs/sq.in. the car would still "tramp", but with the bumper bar fitted we could not get this effect. The above tests were carried out with the front brakes working only. This was necessary for consistent results, as with rear brakes working, the car skidded too easily thereby reducing the efficiency of the front brakes. The tests were over the same stretch of road at approx. speeds of 80 - 85 M.P.H. W.Brazier. | ||