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).
Table comparing the stiffness in lbs/ft./Degree for various car frames and complete cars.
| Identifier | ExFiles\Box 125\1\ scan0287 | |
| Date | 2nd November 1935 | |
| Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}5/KW.2.11.35. Stiffness in lbs/ft./Degree. | | Overall | Dash to Front | Dash to Rear | |---|---|---|---| | Cadillac V-16 Frame | 1010 | 3010 | 1500 | | Complete Cadillac V-16 Car | 3200 | 6100 | 6700 | | Standard Bentley Frame | 53 | 113 | 100 | | B-56-BN{W.O. Bentley / Mr Barrington} - Steel Body | 630 | 1560 | 1060 | | Phantom II Frame | 85 | 190 | 154 | | SpectreCodename for Phantom III Frame | 960 | 2950 | 1430 | | Cy's Frame for "Soft Top" Body | 2640 | 6200 | 4600 | | Cy's complete "Soft Top" Car | 3100 | 6200 | 6200 | | Supercharged Graham Car | 1340 | 2320 | 3200 | | ||