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).
Series of design suggestions for the Goshawk and other battery ignition systems to mitigate H.T. losses.
| Identifier | ExFiles\Box 37\1\ scan 140 | |
| Date | 13th November 1922 | |
| Handwritten: X3199 Handwritten: X4275 Handwritten: X4079 To EFC. from R.{Sir Henry Royce} c. to CJ. Wor.{Arthur Wormald - General Works Manager} PN.{Mr Northey} c. to BY.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair} EP.{G. Eric Platford - Chief Quality Engineer} R1/M13.11.22. X.3199 - RE GOSHAWK AND OTHER BATTERY IGNITIONS. The phenomenon found in the Goshawk suggests additional care and tests of materials, and also shews that the following points should be observed in the design of the ignition apparatus. Every effort should be made to avoid losses that are likely to occur in the ciruits, and with regard to H.T. losses the phenomenon makes the following suggestions :- (1) Take all L.T. wires and earthed metal work as far away from the H.T. winding of the coil and H.T. wires, as is practically possible. (2) Use materials of low inductive capacity such as air (ventilated) paraffin wax, rubber, ebonite, for surrounding the H.T. coil, and all other H.T. parts. (3) Be sure that such materials as are adopted have low dielectric losses up to 100° centigrade. (4) Since the cause of the failure is due to the loss of energy weakening the spark either in electromotive force or quantity, the insulation of the H.T. winding of the coil, the terminals, wires, rotor, distributor, and plugs, should be of the highest value and maintain this value as far as possible up to the maximum working temperature. (5) Provide energy in the circuit sufficient to allow for unavoidable practical losses. (6) The material used for insulation between the layers of the secondary winding should as near as possible have | ||