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 stiffness measurements for various car models.
| Identifier | ExFiles\Box 99\2\ scan0131 | |
| Date | 7th March 1938 | |
| 200B also 1010 FRAME STIFFNESSES. 427. 7.3.38 Torque required to twist 1ft. length of frame through 1°. | | lbs.ft between wheel planes. | lbs.ft. dash to rear axle. | lbs.ft. dash to front wheels. | |---|---|---|---| | P.III. | 25,000 | 26,650 | 21,600 | | Wraith. | 13,500 | 18,600 | 7,500 | | Packard. | 15,150 | 30,100 | 6,450 | | Olds. | 15,000 | 21,000 | 7,420 | | B.III. first type .128" thick. | 18,100 | 24,900 | 10,400 | | B.III. first type .104" thick. | 14,700 | 20,250 | 8,480 | | B.III. 2nd. type all welded. | 15,200 | 16,200 | 13,000 | | B.III. 3rd. type rivetted. | 12,300 | 15,750 | 7,775 | | ||