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).
Modifications to the Goshawk ignition coil to mitigate heat issues.
| Identifier | ExFiles\Box 45\4\ Scan101 | |
| Date | 23th November 1922 | |
| X4079a To EY. from R.{Sir Henry Royce} R3/M23.11.22. c! CJ. c. BJ. c. Wor.{Arthur Wormald - General Works Manager} c. Hs.{Lord Ernest Hives - Chair} X.4079 - GOSHAWK IGNITION. c. PN.{Mr Northey} c. EFC. c. EP.{G. Eric Platford - Chief Quality Engineer} 84595 Apparently it will cause considerable expense to alter the position of the coil, but it should be done as soon as convenient, for the:- PRESENT. (1) Use stabalite cases as arranged, unless with mouldensite one/improved clearances can be proved to be quite as good. (2) Heat and electrically insulate the coil from the engine by fitting air space or non-conducting base, (mouldensite liner and space or vulcasbestos), insulate bolts - try ebonite bushes and bakelite or mica washers, so that they do not assist dielectric losses or heat carrying. The coil should then be only the temperature of the air under the bonnet, and less than the water or metal of the upper part of the engine. NEAR FUTURE. (1) No doubt it will be best to move coil into a cooler place. The scheme will be ready this weekend for present and future coils, and for distributor covers with modified terminal, i.e. at the side. Keep the following parts kw in production:- (1) Coil cases. (2) Engine timing gear cases. (3) Distributor covers.(4) Valve rocker covers. (5) Ignition wire tubes (6) Fixing for ballast resistance and brackets. R.{Sir Henry Royce} | ||