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).
Comparative analysis of rear spring specifications for Rolls-Royce, Lanchester, and Delaunay Belleville vehicles.
| Identifier | ExFiles\Box 80\2\ scan0004 | |
| Date | 8th April 1913 | |
| Contd. -3- AW/EH2/C8.4.13. Rolls-Royce. Lanchester. Delaunay Belville. OFF NEAR OFF NEAR OFF NEAR REAR SPRINGS. Length. 53" 53" 54.5" 54.5" 54.2" 54.2" No. of leaves. 8 8 6 6 10 10 Width of 2.5 2.5 1.625" 1.625" 2.125" 2.125" leaves. Thickness of .400" bottom .5 except two bottom .312" leaves. leaf the rest pleates which taper leaves taper at the gradually get to .375 where they rest ends like R-R.{Sir Henry Royce} thinner to on the axle. leaf .300 lbs. load at 8.45 lbs. 810 897 897 1272 1252 normal ca,ber D.B. cross- 41.2 long 7 leaves, thickness 3.12" to .288" spring. There seems to be no doubt that the Lanchester carry less weight in their springs than we do even taking into account the increased flexibility of our springs. Another point we have pulled the Lanchester rear springs through 10" of move- ment and they have not taken a permanent sit, there are no stops on the Lanchester like our buffers, the first thing to catch is the gear box on the ground. There is no makers name on the Lanchester springs. The Delaunay Belville is very heavy and the flexibility is that one would expect from riding in the car. The normal camber of the springs on the L and D.B. we had to get from the papers. Contd. | ||