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 table comparing rear damper performance at various speeds on two different road surfaces.
| Identifier | ExFiles\Box 181\M9\ img083 | |
| Date | 21th November 1931 guessed | |
| Time in secs. to complete 360° of the O.S. rear damper in an upward direction Specification Speed ROAD SURFACE "A" ROAD SURFACE "B" of rear dampers. in MPH. Outward direction Inward direction Outward directn. Inward direction. Damper loads 80/85. 10 190 192 1188 20 46.4 59 112.6 120.6 30 29.6 46 54.6 91.3 40 12.5 15.2 27.8 45 50 9 11.6 25 27 60 11.6 24 70 11 16.6 Damper loads 80/85 with .055 dia. hole in H.P. valves. 10 188.5 190.4 456 490 20 37 55 74 94 30 22 25.2 41 71.6 40 14 16.8 22.2 37.2 50 9.2 10 17.2 27 60 13 19.5 70 12 12 Damper loads 90/115 No holes in valves. 10 368 384 1211 20 50 66 146 30 38 43 125.4 63.3 40 15 19 60 45.4 50 10.5 10.5 40.5 29.4 60 18.2 22 70 14.5 14.8 12 Road surface "A" = Canal Rd. (Sinfin Lane) " " "B" = Road on to Six Hills. | ||