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).
Comparative table of frame twist data for Hillman, Humber, and Sunbeam Talbot models.
| Identifier | ExFiles\Box 113\5\ scan0076 | |
| Date | 1st December 1938 guessed | |
| Hillman 14 HP. Frame. Humber 16, Snipe/Super Snipe/Sunbeam Talbot 3/4 Ltr. Applied Torque lbs. ft. Twist over 11 ft. length in degrees. Twist over 9'6" wheelbase in degs. Twist over 11 ft. length in degrees. Twist over 9'6" wheelbase in degs. Twist over 11 ft. length in degrees. Twist over 9'0" wheelbase in degs. 126 | 0.324 | 0.28 | 0.143 | 0.123 | 0.155 | 0.139 252 | 0.635 | 0.548 | 0.285 | 0.246 | 0.298 | 0.266 377 | 0.945 | 0.815 | 0.434 | 0.375 | 0.44 | 0.394 504 | 1.27 | 1.18 | 0.583 | 0.504 | 0.583 | 0.521 629 | 1.58 | 1.36 | 0.732 | 0.633 | 0.738 | 0.66 755 | 1.90 | 1.64 | 0.88 | 0.76 | 0.894 | 0.80 881 | 2.23 | 1.92 | 1.04 | 0.895 | 1.04 | 0.925 Frame has box side members and transverse cross members, no X bracing. Weight 184 lbs. On final reading stiffness is 460 lbs.ft./degree between wheel planes. Frame has box side members and channel section cross with some reinforcing across open side of cross. Weight 201 lbs. On final reading stiffness is 985 lbs. ft/degree between wheel planes. Frame has box section side members and I section cross. Weight 209 lbs. On final reading stiffness is 950 lbs. ft/degree between wheel planes. All frames are welded. | ||