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).
Specification sheet for spring No. F.2441, showing data for a 9-leaf and a 10-leaf variant.
| Identifier | ExFiles\Box 67a\1\ scan0011 | |
| Date | 18th July 1924 guessed | |
| SPRING DRAW ON 9-LEAF SPRING No. F.2441. Space between leaves. No.1 and 2 | .725" 2 " 3 | .300" 3 " 4 | .250" 4 " 5 | .275" 5 " 6 | .150" 6 " 7 | .150" 7 " 8 | Nil 8 " 9 | Nil Thickness of spring with centre bolts complete - 3.250" When free -- 5.100" Total nip -- 1.85" Normal load 2000 lbs. SPRING NO. F.2441 Space between leaves. No.1 and 2 | 1.400 2 " 3 | .250" 3 " 4 | Nil 4 " 5 | Nil 5 " 6 | Nil 6 " 7 | Nil 7 " 8 | Nil 8 " 9 | Nil 9 " 10 | Nil Thickness of spring with centre bolt complete - 3.725" When free -- 5.375" Total nip -- 1.650" Normal load 2100 lbs. Rear springs off 46-PK. | ||