Specifications and test results for two types of valve springs for scheme N.SCH.3497.
| Identifier | ExFiles\Box 56\1\ Scan213 | |
| Date | 10th September 1932 | |
| 8235. VALVE SPRING FOR N. SCH. 3497. 10.9.32. 10" Lever. DO. Spring. 1. 50 lb. Ball Pin = 3.8935 lbs spring load. 100 " " " = 7.787 " " " 150 " " " = 11.680 " " " 2. Rating = 97.4 lb/in. 3. 75 lb. B.P. load = .06" spring set up. 150 " " " = .12" " " " ∴ increase on set up = .06" Expl. Spring. 1. 50 lb. Ball Pin load = 6 lb. spring load. 100 " " " " = 12 lb. " " " 150 " " " " = 18 " " " 2. Rating = 172 lb/in. 3. 75 lb B.P. load = .0525" spring set up. 150 " " " " = .105" " " " ∴ increase in set up = .0525" 38,000. Spring .600 free length. Mean Coil dia. .420 Gauge of wire 14 gauge .080 Coils 4 coils and one square each end. ----------- | ||
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).