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).
Test data on axle movement and car swaying under various road conditions and speeds.
| Identifier | ExFiles\Box 67a\2\ scan0207 | |
| Date | 29th October 1928 guessed | |
| contd :- -3- AMPLITUDE AXLE MOVEMENT. Undamped. Pot holes 23 m.p.h. 1.20" 35 m.p.h. 1.50" Damped. Pot holes. 23 m.p.h. .900" 35 m.p.h. 1.000" Main road. 23 m.p.h. .700" 35 m.p.h. .700" 45 m.p.h. .844" AMPLITUDE CAR SWAYING MOVEMENT. Undamped. TOTAL. Main road 48 m.p.h. 2.4" Level cross: 23 m.p.h. 2.5 35 m.p.h. 7" Hump backed. 35 m.p.h. 11" Damped. Level cross: 35 m.p.h. 1.25" 40 m.p.h. 3.0" Humped backed bridge. 35 m.p.h. 4.0" 40 m.p.h. 9.0" TESTS WITH NO SHOCK ABSORBERS AND SPRINGS GREASED. (a) Average velocities of axle movement. ft/sec. Shardlow main road 23 m.p.h. 1.235 35 m.p.h. 1.425 45 m.p.h. 2.050 Boulton Lane (pot holes) 23 m.p.h. 1.705 35 m.p.h. 2.48 ------------------ contd :- | ||