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).
Specifications for a Bentley III all-welded frame, detailing torsional rigidity for different thicknesses.
| Identifier | ExFiles\Box 86\4\ scan0237 | |
| Date | 8th June 1937 guessed | |
| Bentley III frame. all welded . 128" thick. 1750 lbs. ft. / degree . 104" thick 1420 lbs. ft. / degree | ||