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 and frame types.
| Identifier | ExFiles\Box 113\5\ scan0056 | |
| Date | 7th March 1938 | |
| 1010 also 200B FRAME STIFFNESSES. Torque required to twist lft. length of frame through 1°. ,lbs.ft between wheel planes.,lbs.ft. dash to rear axle.,lbs.ft. dash to front wheels. P.III.,25,000,20,650,21,600 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 | ||