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).
Frame distortion test comparing a Terraplane and an 18-G-IV vehicle.
| Identifier | ExFiles\Box 5a\3\ 03-page326 | |
| Date | 25th January 1934 | |
| COPY X 5840 18-6-34 To Sg.{Arthur F. Sidgreaves - MD} from Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} c. to Wor.{Arthur Wormald - General Works Manager} c. to By.{R.W. Bailey - Chief Engineer} c. to E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}7/KW.25.1.34. Frame Distortion. ---------------- We have twisted both the Terraplane and 18-G-IV car by applying a pure torque to the front dumb irons. The car was resting on its 4 tyres and not restrained in any way. By applying a pure torque the centre of gravity of the car should not be raised, and therefore the weight distribution should have no effect on the result. The position of the spring anchorage and rating of the springs will however have an effect, but as this effect is present on the road we consider that the conditions of this test represent very nearly what actually happens in a car. IT will be seen that whereas 18-G-IV behaves as a beam in torsion restrained at the rear, the Terraplane does not. This we attribute first to the cross resisting torsion of the centre of the frame, and secondly to the very stiff body transferring the twist from its front anchorage to the rear part of the frame. Hs{Lord Ernest Hives - Chair}/H.Grylls. See also File X.4217, for drawings. | ||