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).
Comparison of torsional strength and weight between S.S. Jaguar and Bentley III frames.
| Identifier | ExFiles\Box 126\5\ scan0062 | |
| Date | 2nd June 1938 | |
| Rm{William Robotham - Chief Engineer}/Clapham.7/MH.{M. Huckerby}2.6.38. S.S. JAGUAR FRAME. 10' 7'6" 2'6" 1640 lbs.ft./degree 2560 lbs.ft./degree 1000 lbs ft/degree. Comparisons between cruciform frame & box section frame. Torsional Strength Weight lbs.ft/degree. lbs. Bentley III (welded) 1470 262 S.S. (welded) 1000 317 S.S. (if same length as B.III) 970 327 S.S. (if same length and weight as B.III) 780 262 S.S. (if same length and strength as B.III.) 1470 495 89% heavier. The body is attached to the frame by 28 bolts, and there is no body subframe. Rm{William Robotham - Chief Engineer}/Clapham. | ||