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).
Table comparing the specifications of springs for various car models.
| Identifier | ExFiles\Box 112\1\ scan0074 | |
| Date | 30th December 1937 guessed | |
| Car. Spring Drawing No. Thickness of spring Top Leaf ins. Length of spring ins. Bump, ins. from spring drawing. Static deflection of spring, ins. Stress range lbs/in² B.II. FB.2885/6 0.290 50 3.125 4.00 97,400 25/30 HP. F.58610/2 0.270 56 4.75 6.40 110,080 25/30 HP. F.57196 0.300 56 4.75 5.125 110,000 25/30 HP. F.60979/80 0.281 56 4.75 5.65 108,300 Phantom III. F.89570 F.89574 0.340 66 4.625 ø 7.00 93,900 ø Bump figure from arrangement drawings is 4.25" and rebound is controlled to 6.00", so that stress range is for a range of movement of 10.250" in this case. In other cases stress range is for the movement range of the sum of the bump and static deflection figures. -------------------- | ||