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).
Results of 10,000-mile tests on Bentley 4½° pivot front axles and their use on trials cars.
| Identifier | ExFiles\Box 84\3\ scan0233 | |
| Date | 7th September 1934 | |
| x201 To RHC.{R. H. Coverley - Production Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}10/KW. 7.9.34. Bentley 4½° Pivot Front Axles. As a result of recent 10,000 miles tests GWH.{George W. Hancock - Head Chateauroux} is definitely of the opinion that the 4½° pivot lean front axle gives better steering than the present standard. In view of this we are anxious to fit three of these axles to Trials cars. We understand that the axle itself is obtained from the same forging whether it is 2° or 4½° pivot lean, and this means that any forgings now obtained for the 4½° pivot axle will therefore be of the latest strengthened type. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||