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 drawing for valve springs for Dubonnet dampers.
| Identifier | ExFiles\Box 154\1\ scan0238 | |
| Date | 4th January 1935 | |
| SCALE - 2/1 Hs {Lord Ernest Hives - Chair} 1683 EXTERNAL DIA - .250" 21 S.W.G WIRE (DIA .032") FREE LENGTH - A MATERIAL SPRING STEEL DETAILS OF SPRINGS REQUIRED TABLE 1: FREE LENGTH - A 2 OFF WITH A = 1.220" 2 OFF A = 1.040" LOAD IN POSITION 1st PAIR ABOVE TO HAVE LOAD OF 2.73 LBS AT LENGTH OF 1.075" 2nd PAIR TO HAVE LOAD OF 2.14 LBS AT .925" LENGTH TABLE 2: EXTERNAL DIA: .250" WIRE: 21 SWG (DIA.032) NO. OF WORKING COILS: 8 TOTAL NO OF COILS: 10 - ONE COIL AT EACH END GROUND SQUARE RATE: 18.6 LBS/IN VALVE SPRINGS FOR DUBONNET DAMPERS STAMP: S-ROYCE, LTD PRINT ROOM 4 JAN 1935 DERBY | ||