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).
Letter to Adamant Engineering Co Ltd discussing the feasibility and gear ratios for fitting a J.2. type steering to a Bentley vehicle.
| Identifier | ExFiles\Box 28\2\ Scan181 | |
| Date | 18th May 1933 | |
| XH094 Ms/Rn.{Mr Robinson}7/KT. May 18th 1933. The Adamant Engineering Co Ltd, Dallow Road, Luton. For the attention of Comdr. Matravers. Dear Sirs, With reference to your letters of the 17th and 2nd. May, we have now summarized the information available for fitting the J.2. type steering to the Bentley. We want to fit the small box because it is essential that the weight should be kept down. The difficulty is that the lowest gear ratio is not low enough. The reason we say that it is not low enough is as follows :- The standard Phantom box ratio is 13/1, we replaced a ratio of 16.25/1 and got a satisfactory steering. The standard Bentley box ratio is 12.7/1, therefore, following data we have established on the Phantom, the correct Marles Weller box ratio applied to the Bentley would be 15.9/1. The lowest you have to offer is 13.2/1. The only way we can get the required results with the 13.2/1 ratio on the Bentley is to reduce the length of the pendulum lever which is at present 8.050" to 6.750". The objection to this is that we have already a remarkably good lock, and with the 8.050" pendulum lever require 75° angular movement thereof. To get the same lock with the short lever the angular movement is increased to 88° and it appears problematical to us whether you will be able to give us this. We are sending you a drawing number Ex.11226, which shews this information diagramatically. cont'd.{John DeLooze - Company Secretary} | ||