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).
Improvements for battery ignition systems and plugs, comparing English porcelain plugs to Champion plugs for aero engines.
| Identifier | ExFiles\Box 35\6\ scan 374 | |
| Date | 28th November 1927 | |
| HS.{Lord Ernest Hives - Chair} EY. EFC. } from R.{Sir Henry Royce} c. BJ. Wor.{Arthur Wormald - General Works Manager} X2894 R3/M28.11.27. BATTERY IGNITION & PLUGS. X.8692. X.2894. Scrubbing tungsten contacts to LeC.2460. are we believe now standard, with the improved spring (non-fracture easily detachable). We have no record of the thickness of springs and stress at requisite contact pressure = 1 1/2 lbs. Further experiments are going forward to prove if there are any advantages in - (1) Increased scrub. (2) Offset fibre giving slightly quicker break than make. (3) Distributor improvements - umbrella and non-tracking material (stabalite) We are particularly anxious about (3) because (1) and (2) can only give us small improvement. Whatis stopping English makers from making porcelain ignition plugs equal to Champion, as we understand these are superior to anything on aero engines - i.e. most trying conditions. R.{Sir Henry Royce} | ||