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).
Mechanical efficiency of the Marles steering gear on the 21-G-IV model.
| Identifier | ExFiles\Box 28\3\ Scan127 | |
| Date | 21th February 1935 | |
| To Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}: x4094 Hs{Lord Ernest Hives - Chair}/FJH.{Fred J. Hardy - Chief Dev. Engineer}12/KW.21.2.35. Mechanical Efficiency of Marles Steering on 21-G-IV. The attached curve, Hs.{Lord Ernest Hives - Chair}1793, shows the mechanical efficiency of the Marles steering gear at present on 21-G-IV, i.e., with the 3 1/4 turn cam and after "running in" on the rig. A comparison of this curve with Hs.{Lord Ernest Hives - Chair}1556 and Hs.{Lord Ernest Hives - Chair}1605 attached is very disappointing, as there is no consistent decrease of reverse efficiency as the helix angle is reduced. This tends to confirm that static efficiency figures are of little use as a measure of the gear's ability to resist road shocks. The results with the La{L. A. Archer} Salle column were even more striking, the reverse efficiency being slightly higher than the forward, yet the gear is more effective in the chassis. Hs{Lord Ernest Hives - Chair}/F.J.Hardy. | ||