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).
Weight comparison list for Semi-Floating and Fully Floating Bentley rear axles and their components.
| Identifier | ExFiles\Box 84\4\ scan0384 | |
| Date | 13th July 1938 | |
| 202 δ Rm{William Robotham - Chief Engineer}/Cr.{Mr Cra???ster / Mr Chichester}2/MH.{M. Huckerby}13.7.38. Weight Semi-Floating and Fully Floating Rear Axle, Bentley. Semi-Floating Axle, with hubs 148 lbs. 1½ ozs. 2 pressed wheels, less tyres 42 lbs. 12 ozs. and tubes 10 wheel nuts 1 lb. 6 ozs. Fully Floating Axle, with hubs 117 lbs. 15½ ozs. 2 wheels less tyres and tubes 44 lbs. 12 ozs. 2 wheel nuts 3 lbs. 9 ozs. Rm{William Robotham - Chief Engineer}/Cr.{Mr Cra???ster / Mr Chichester} | ||