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).
Proposal to test a 20/25 HP engine with an interlaced crank, questioning the ignition coil's performance at high speeds.
| Identifier | ExFiles\Box 54\5\ Scan340 | |
| Date | 12th December 1930 | |
| X5680 EFC. c. E.{Mr Elliott - Chief Engineer} (struck through) c. BY/SS.{S. Smith} (struck through) BY12/G.12.12.30. [Stamp: RECEIVED 12 DEC 1930 HS{Lord Ernest Hives - Chair}] 25 HP. CHASSIS WITH INTERLACED CRANK. --------------------------------------- It has been proposed that we try out a 20/25 HP. engine with one of the above type of cranks. This involves a low tension ignition controlling breaker having angles between the six cams of 30°, 60° and 90° e.g. (60° - 60° - 30° - 60° - 60° 90°). Will a 30° interval be sufficient to enable sufficient energy to be stored up in the coil to give a satisfactory spark at "break" at high speeds. BY.{R.W. Bailey - Chief Engineer} [Signature: By] | ||