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).
Goshawk and other battery ignitions, detailing suggestions to avoid circuit losses.
| Identifier | ExFiles\Box 45\4\ Scan076 | |
| Date | 13th November 1922 | |
| To EFC. from R.{Sir Henry Royce} c. CJ. Wor.{Arthur Wormald - General Works Manager} PN.{Mr Northey} c. By.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair} EP.{G. Eric Platford - Chief Quality Engineer} X40790 R1/M13.11.22. X.3485. GOSHAWK AND OTHER BATTERY IGNITIONS X4079 The phenomenon found in the Goshawk suggests additional care and tests of materials, and also shows 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 circuits, 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 the virtues suggested in paras 2, 3, & 4. Contd. | ||