Torsional stiffness test results for a B.III riveted frame.
| Identifier | ExFiles\Box 99\2\ scan0140 | |
| Date | 18th March 1938 | |
| r 427. To By. {R.W. Bailey - Chief Engineer} from Rm {William Robotham - Chief Engineer} /Clapham. c. Da. {Bernard Day - Chassis Design} c. Da {Bernard Day - Chassis Design} /Ev. {Ivan Evernden - coachwork} Rm {William Robotham - Chief Engineer} /Clapham.7/MR.18.3.38. B.III RIVETED FRAME. The torsional stiffness of the B.III riveted frame after 50 hrs. running on the bumper rig was 1100 lbs.ft./degree between wheel planes. This compares with 1190 lbs.ft./degree before bumping, as as several large holes were drilled in the cross between the two tests it may be taken that no weakening occurred. Rm {William Robotham - Chief Engineer} /Clapham. | ||
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).