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).
Specifications for replacement taper valve springs for F.II Unit No. 28, cancelling a previous instruction.
| Identifier | ExFiles\Box 17\6\ Scan233 | |
| Date | 5th June 1934 | |
| 7060 RHC{R. H. Coverley - Production Engineer}: Hs{Lord Ernest Hives - Chair}/Smth.10/KW.5.6.34. Valve Springs for F.II Unit No. 28. We find that with the springs instructed in our memo: Hs{Lord Ernest Hives - Chair}/Smth.24/KW.31.5.34, there is a danger of the spring top washers fouling the rockers. Will you therefore cancel this instruction and put in hand a set of taper springs as under :- Inner Outer Dia. and gauge .128 (10 SWG.) .212 (5 SWG.) Inner dia. of coils small end .875 1.150 large end .975 1.375 Total No. of coils 8 1/2 6 1/2 Free length 2.395 2.495 Length (valve closed) 1.750 2.000 Load (valve closed) 28.5 81.5 Rating 44.0 164.5 Other manufacturing details as for E.84551/2. The existing spring washers will take these springs. Hs{Lord Ernest Hives - Chair}/F.II.Smith. | ||