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).
Spring torsion and distortion tests, referencing two graphs and test number X2628.
| Identifier | WestWitteringFiles\J\March1923\ Scan25 | |
| Date | 17th March 1923 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} c. to CJ. c. to E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to EY. ORIGINAL Hs{Lord Ernest Hives - Chair}/Rn{Mr Robinson}1/LG17.3.23. SPRING TORSION AND DISTORTION TEST. X2628 Graph 1. The spring was held as shown in the sketch, with one end fixed, and the other allowed to move on the swivel. Having had the camber removed by a force acting at its centre, the torque was applied, and the angle between the face of the top leaf and the horizontal measured as near the centre as practicable. It will be observed from the attached graph, that, (after the preliminary movement) from 2 1/2° to 8° an increase in deflection of 1° is approximately proportional to a torque increase of 34 lbs.ft., from 8° - 14° to a torque increase of 50 lbs.ft. Graph 2. The spring was clamped down as illustrated, and the lateral deflection measured from a point 24" from the centre of the spring in the top leaf. As the load was applied, the spring tended to twist, the smaller leaves rising. The angle of twist measured at the same point is plotted in the smaller graph. The same spring was used for both tests. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||