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 for modifications to crankshafts, spring drives, connecting rods, pistons, and cylinder heads.
| Identifier | ExFiles\Box 123\5\ scan0234 | |
| Date | 15th December 1938 | |
| -2- Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}1/MH.{M. Huckerby}15.12.38. A further crankshaft should be made to SCD.1043, otherwise to EB.4487 which is R.R. balance weight crank with modified drilling and incorporates a spigot for the flexible flywheel. A further crank should also be produced to EB.4487 which has R.R. balance weights and incorporates a spigot for the flexible flywheel. These two cranks will fit either No.1, 2 or 3 units, making a total of 6 cranks in all. SPRING DRIVE. No.2 and 3 UNITS. In accordance with memo Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}9/MH.{M. Huckerby}9.12.38. No.4 UNIT. Spring drive to SCD.1043. CONNECTING RODS. Complete sets as instructed in our memo Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}2/MH.{M. Huckerby}17.11.38. PISTONS. No.4 Unit to have raised crown pistons PD.304. A spare set should be ordered at the same time. CYLINDER HEADS. No. 2 and 3 units to incorporate PD.292 transfer throat modification and have .070 machined off the face. No. 4 unit. As No.2 and 3 but not machined on face. a similar spare head should be made. The cylinder head which was damaged on endurance to be recovered and modified to PD.334 for further tests on No.1 unit. | ||