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).
Graph comparing the load, stress, and deflection characteristics of two 25 HP chassis valve springs.
| Identifier | ExFiles\Box 102\5\ scan0106 | |
| Date | 23th November 1931 | |
| Deflection in inches Load in lbs. Stress in lbs .8075 Initial deflection .330 lift .400 lift .160 Coil Clearance. .090 do do. Stress at large end of Spring increases to 102,000 lbs Choc. Spring Hs.{Lord Ernest Hives - Chair}451 Spring E56325 Std lift Higher lift .361 Initial deflection .330 lift .400 lift .160 Coil Clearance .090 do do. .026 per coil } Overenamelled .015 per coil } Actual choc length of enamelled spring = .985 = .011 clearance per coil Comparison of 25 H.P. Chassis Valve Springs Loads & Stresses are slide rule figures calculated on the mean coil dia. Stresses at large dia of spring should be increased 5% with a corresponding reduction for the smaller dia. end. Refer to teC.2610 for full characteristics of Spring E56325. Length, choc as teC 2610 = .864. Derby Calculated choc = .960. Actual choc of enamelled spring = .985. ROLLS-ROYCE, LIMITED PRINT ROOM, 23 NOV 31 DERBY. | ||