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).
Calculations and specifications for front springs to lower a vehicle.
| Identifier | ExFiles\Box 67a\1\ scan0259 | |
| Date | 21th January 1927 guessed | |
| FRONT SPRINGS. 10 EX. 78410 Requirements. 25% stiffer springs to lower the front of the car .5" WT of front of the car empty. 2457 LBS. Unsprung wt. 460 LBS. Total empty sprung wt 1997 Two pass sitting forward 160 LBS. 2157 LBS Subtract-Wolseley. (lightened engine) 100 2057. ∴ Wt per spring. 1025 LBS. Normal spring deflection. 3.1" ∴ 25% stiffer. Spring defln. 2.34" And final camber to be 1" neg. ∴ Initial Camber 1.34" Pos. Normal movement from static position to max bump 2.2" 25% stiffer spring movement- 1.65" ∴ Max neg Camber for stress 1" + 1.65" = 2.65" Spring rating - 1025 / 2.34 = 440 lbs / 1" ∴ Spring specification Initial Camber. 1.34" Pos. Rating. 440 lbs / 1" Max defln for stress 2.65" Neg Camber. | ||