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).
Calculation sheet for the spring loads of a 7-EX Phantom car scheduled for running in France.
| Identifier | ExFiles\Box 71\2\ scan0119 | |
| Date | 22th January 1926 guessed | |
| 7-EX - PHANTOM CAR. SPRINGS REQUIRED IF SPRUNG ACCORDING TO SCHEDULE FOR RUNNING IN FRANCE. | FIXED CHASSIS LOADS. (As per chart) | SPRINGS. | | | FRONT. | REAR. | | | Near. | Off. | Near. | Off. | |---|---|---|---|---| | Spares, wheels etc. | 896 | 946 | 693 | 793 | |---|---|---|---|---| | VARIABLE LOADS. | | | | | | Body weight - 11 cwts. | 190 | 190 | 436 | 436 | | 4 passengers - 154lbs.each. | | | | | | 1 cwt. of luggage on grid allowed for in fixed chassis loads. | 93 | 93 | 215 | 215 | | | 1179 | 1229 | 1344 | 1444 | |---|---|---|---|---| | ALLOWANCES. | | | | | | 50 lbs. off each front spring. | -50 | -50 | | | | 100 lbs. not subtracted from rear springs owing to car going to France. | 1129 | 1179 | 1344 | 1444 | |---|---|---|---|---| | Cantilever springs rear. | | | X 1.5 | X 1.5 | | Sprung for 75% of load i.e. multiply by | | | | | | (2 X 75) / 100 = 1.5 | | | | | | | 1129 | 1179 | 2000 | 2160 | | | 12½% stiffer. | 12½% stiffer. | | | | ||