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).
Failures and modifications to the high tension ignition rotor for the 25/30 and Bentley chassis.
| Identifier | ExFiles\Box 130\2\ scan0345 | |
| Date | 11th December 1936 | |
| Hs.{Lord Ernest Hives - Chair} [redacted] E.{Mr Elliott - Chief Engineer} [redacted] Rm.{William Robotham - Chief Engineer} [redacted] [redacted] 11/3 BY.2/G.11.12.36. 25/30 and BENTLEY CHASSIS. RE: HIGH TENSION IGNITION ROTOR. ------------------------------ Referring to Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux}3/R.9.12.36. I do not concur with the idea that the new rotor is expensive and unnecessary, in view of the idea that it is now suggested failures are mainly due to not drying out the powder. The modification to the rotor is such that any increase in price is negligible, its provision of an air gap makes failure even with a doubtful rotor unlikely, the actual increase is merely the addition of an insert and screw to bring the rotor into balance and is desirable whichever form of rotor is used. Furthermore, I have seen two or three rotors where the failure was due to metal swarf from an insert in the moulding, and if this occurs with the new rotor it will not cause a failure, the air gap is a sufficient safeguard to prevent it. BY.{R.W. Bailey - Chief Engineer} By | ||