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 of torsional stiffness and vertical deflection measurements for different chassis setups.
| Identifier | ExFiles\Box 112\1\ scan0111 | |
| Date | 1st December 1938 | |
| 1.12.38. 1.B.50. Torsion Stiffness with body lbs-ft/degree. | Vertical Deflection 50" behind front axle due to a 500 lb. load on front seat. Front to Rear | Dash to Rear | Dash to Front. Standard | 2040 | 4030 | 3700 | .013" Side Plates | 2100 | 4030 | 3850 | .011" Gussets welded on top | 2270 | 4630 | 4440 | .0125" Rm{William Robotham - Chief Engineer}/Clm.{D. D. Clapham} | ||