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).
Tension tests on a cross steering tube under various road conditions.
| Identifier | ExFiles\Box 2\12\ B002_X168-page024 | |
| Date | 10th December 1931 guessed | |
| AW/EH19/L12313 (contd) (2) the lbs pull. We were surprised at the amount of tension there is on the cross steering tube, we varied the spring pressure to suit conditions and did not rely on a large amount of movement to give us the reading. No. of Test. | Road Conditions. | m.p.h. | lbs tension | Remarks. 1 | Average road. Works to Chell-aston. | 20 to 30 | 210 | Few pot holes, no sharp corners. 2 | Bumpy road from Works to Barracks | 20 | 400 | Very bad road, worse than one ever gets on main roads. 3 | To represent a French "cavineux" we laid a single string of ballast bags across the track, they were 3.5" high. | 25 | 700 | Both wheels striking obstacle. 4 | Same as above | 25 | 600 | Near side wheel striking only 5 | Same as above | 25 | 650 | Off side wheel only There is no doubt that striking a cavineaux with both wheels together gives us the worst oblique reversal on the pivots, striking a sharp obstacle in any way puts a lot of tension on the cross rod. | ||