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).
Specification sheet detailing vehicle spring rates, wheel movements, and loads.
| Identifier | ExFiles\Box 154a\4\ scan0095 | |
| Date | 1st March 1939 | |
| -2- Rm {William Robotham - Chief Engineer} /FWK.5/JH.1.3.39. Spring Rates. N.S.F. 130 lb/in. Δ = 6.4" U.L. 7.0" L. O.S.F. 130 lb/in. Δ = 7.45" U.L. 8.05" L. N.S.R. 160 lb/in. Δ = 5.6" U.L. 6.9" L. O.S.R. 165 lb/in. Δ = 5.7" U.L. 6.95" L. Front roll rating = 170 lb/in. at wheel. Rear " " = 130 lb/in at wheel. Front roll bar fitted. Front wheel Movements. Rebound. UNLADEN. LADEN. BUMP. O.S. 5¾" 3¼" 3¾" 0". N.S. 5¾" 4¼" 3¾" 0". Rear Wheel Movements. Rebound. UNLADEN. LADEN. BUMP. O.S. 7½" 4" 3" 0". N.S. 7¼" 3½" 2¼" 0". S.H.V. Front springs - English Steel OPEN COIL FB.3826. Rear springs - Toledo Woodhead + interleaving. ......... Loads on each wheel. + driver + 4 passengers. O.S.F. 967 lb. 1042 lb. N.S.F. 932 lb. 1007 lb. O.S.R.1050 lb. 1265 lb. N.S.R.1060 lb. 1275 lb. | ||