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).
Analysis of friction in a spring-loaded cross steering tube scheme, including a comparison table of different axle conditions.
| Identifier | ExFiles\Box 17\3\ Scan202 | |
| Date | 19th July 1927 guessed | |
| contd :- -2- spring. This scheme in conjunction with the spring loaded cross steering tube allows us to get the additional friction which we can make use of owing to our low overall steering ratio of 16-1. We have previously been rather apprehensive as to what might happen to this scheme in the pivot in the event of it not receiving proper lubrication, but with the one-shot system this trouble no longer exists, therefore we think it might be employed on the sports cars and as standard when 12-EX improvements have completed 10,000 miles. We shall then be able to carry on with the existing cross steering tube which gives friction equivalent to 375 ins/lbs. about the pivots, as it will be adequately supplemented by N.sch.2296. The estimated friction we get with the various arrangements is as follows. We have of course had to assume very roughly that on a bad road only half the weight of the car is on the pivots i.e., one wheel is usually in the air. FRICTION MEASURED IN LB/INS. ABOUT THE PIVOT. CONDITION OF AXLE. | SHUNTING. | CAR AT HIGH SPEED ON BUMPY ROAD WHEN HALF WT. ONLY IS ASSUMED TO BE CREATING FRICTION ON THE PIVOTS. (1) New type axle. No load on cross tube. | 400 | 200 (2) New type axle 1250 lbs.load on cross tube ball ends. | 775 | 575 (3) As (2) with DA{Bernard Day - Chassis Design}'s scheme 2296 shunted friction with 825 lbs. spring. | 895 ++ | 895 ++ ++Proposed for sports car and at present on 14-EX. Note friction shunting only increased by 15% but friction when sustaining joggles increased by 55% due to scheme 2296. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||