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).
Torsion test results for a 20 HP front axle, showing load versus permanent set and deflection profile.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan80 | |
| Date | 7th October 1925 | |
| TORSION TEST OF 20 H.P. FRONT AXLE BOTTOM DATUM LINE TOP DATUM LINE LOAD APPLIED TENDS TO BEND AXLE THIS WAY PERMANENT SET [INCHES] DISTANCE FROM PIVOT CENTRE (TOP) DISTANCE FROM PIVOT CENTRE (BOTTOM) Table 1: TOP INCHES FROM CENTRE | PERMANENT SET INCHES 0 | +.062 1 | +.085 2 | +.095 3 | +.095 4 | +.085 5 | +.015 6 | -.012 7 | -.018 7.750 | 0 BOTTOM INCHES FROM CENTRE | PERMANENT SET INCHES 0 | -.158 1 | -.118 2 | -.080 3 | -.055 4 | -.025 5 | -.005 5.875 | 0 RELATION BETWEEN PERMANENT SET AND LOAD LOAD ACTS AT 11.7" RADIUS PERMANENT SET [DEGREES] LOAD [LBS] Table 2: LOAD LBS | PERMANENT SET DEGS. MINS. 1500 | - 4 1600 | - 9 1700 | - 15 1800 | - 18 1900 | - 24 2000 | - 28 2100 | 1 0 2200 | 1 10 2300 | 1 50 2400 | 2 20 2500 | 4 20 | ||