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).
Steering pivot tests conducted on a track to determine cracking times under various conditions.
| Identifier | ExFiles\Box 2\12\ B002_X168-page072 | |
| Date | 2nd April 1913 | |
| From Exp. Dept. Copies for: Mr Johnson Mr Royce Mr Spinney Mr Hadin AW/9120/L2413 April 2nd 1913. Re Steering Pivot Tests on the Track. - T.R.47/68 Instead of having ballast bags and pieces of wood for obstacles we are now using the cast iron weights which were used for the frame deflection tests, these are 2" high. I enclose photo showing them in position on the track. Our reason for changing them first because the ballast bags get flattened out and it was a job to get comparative tests, second, because we wanted to try and break a pivot with lots of small bumps instead of a fewer number of large ones. There were 37 obstacles on the track and the car covered one lap per minute. All pivots tested are the old type which are breaking. No. of test | Type of pivot | Time in mins. to crack | Conditions. 1 | off side | 20 | Solid straight cross tube. 2 | Near side | 75 | As in test 1. 3 | Near side | 70 | As in test 1. 4 | Near side | 120 | As in test 1. 5 | Off side | 35 | spring buffers in cross tube. 6. | Off side | 90 | As in test 5 7 | Near side | 160 | spring buffers as in test 5 8 | Near side | 80 | As in test 5 9 | Off side | 206 | As in test 5 Remarks on the Test The spring buffer arrangement that we used was practically | ||