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).
Comparison of suspension spring and roll ratings for various vehicle models.
| Identifier | ExFiles\Box 154a\4\ scan0050 | |
| Date | 7th January 1938 | |
| To Rm. {William Robotham - Chief Engineer} Rm {William Robotham - Chief Engineer} /Cm.4/AP.7.1.38 SPRING RATINGS. Spring Rating Total Weight Unsprung Weight. Initial Deflection. Front Rear Front Rear Front Rear Front Rear Packard. 79 110 825 1000 120 170 8.9" 7.55" Oldsmobile. 92 125 890 943 120 170 8.4" 6.2" Vauxhall. 112 - 790 - 80 - 6.35" - 33-EX. 181 - 1350 - 170 - 6.5" - 24.G.V1. 125 165 1075 1148 150 190 7.4" 5.8" 27.G.V1. 119 175 1033 1140 150 190 7.4" 5.4" B.III. 140 - 850 - 110 - 5.3" - ROLL RATINGS. Front with Front without Rear with roll bar. roll bar. roll bar. Packard. 77 109 Oldsmobile. 237 100 144 24.G.V1. 266 131 - 27.G.V1. - 121 224 Although B.III. has 6" free movement between the buffers while the Packard has only 3½", yet the Packard has more free movement in the bump direction because it is very close to its rebound buffer in the normal position. The Oldsmobile has 4½" of free movement 2½" being in thebump direction. Wraith has 6", 2½" being in thebump direction. Both Wraith and B.III. go onto their bump buffers more abruptly than Packard and Olds, suggesting that we should have more taper on our buffers. The Wraith bump buffer seems to be unnecessarily hard. RM {William Robotham - Chief Engineer} /D.Clapham. | ||