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).
Graph plotting angular deflection to show frame distortion for a 20/25 car under various applied torques.
| Identifier | ExFiles\Box 21\6\ Scan119 | |
| Date | 25th January 1934 guessed | |
| FRAME DISTORTION 20/25 CAR (18.G.IV) TORQUE APPLIED AT FRONT DUMB IRONS 2250 LBS @ FT ANGULAR DEFLECTION 1800 1350 900 450 FRONT DUMB IRONS FRONT AXLE 44" REAR AXLE REAR DUMB IRONS 1" = 20" | ||