Data table comparing rear damper specifications by time to complete a 360° movement at various speeds on two road surfaces.
| Identifier | ExFiles\Box 56\1\ Scan193 | |
| Date | 11th December 1931 guessed | |
| Time in secs. to complete 360° of the O.S. rear damper in an upward direction Specification of rear dampers. Speed in MPH. ROAD SURFACE "A" outward directn. inward directn. ROAD SURFACE "B" outward direction. inward direction. Damper loads 80/85. 10 20 30 40 50 60 70 180 46.4 29.6 12.5 9 192 59 46 15.2 11.6 1188 112.6 54.6 27.8 25 11.6 11 120.6 91.3 45 27 24 16.6 Damper loads 80/85 with .055 dia. hole in H.P. valves. 10 20 30 40 50 60 70 188.5 37 22 14 9.2 190.4 55 25.2 16.8 10 456 74 41 22.2 17.2 13 12 490 94 71.6 37.2 27 19.5 12 Damper loads 90/115 No holes in valves. 10 20 30 40 50 60 70 368 50 38 15 10.5 384 66 43 19 10.5 125.4 60 40.5 18.2 14.5 12 1211 146 63.3 45.4 29.4 22 14.8 Road surface "A" = Canal Rd. (Sinfin Lane) " " "B" = Road on to Six Hills. | ||
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).