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).
Investigation report on faults in Goshawk ignition coils and a potential new material for coil cases.
| Identifier | ExFiles\Box 49\5\ Scan021 | |
| Date | 17th July 1923 | |
| x4273 To EP. {G. Eric Platford - Chief Quality Engineer} from EFC. {E. Fowler Clarke - Electrical Engineer} c. BY. {R.W. Bailey - Chief Engineer} WOR. {Arthur Wormald - General Works Manager} c. Sft. {Mr Swift} for Mr. Brock. EFC {E. Fowler Clarke - Electrical Engineer} 6/T17.7.23. 4273 X.4079 - GOSHAWK IGNITION COILS. Further to our EFC {E. Fowler Clarke - Electrical Engineer} 1/T17.7.23, coils Nos. 2960 and 3009 have been further investigated. With the former of the two coils, there seems to be very little wrong. The primary resistance, however, is a little bit low, so also is the secondary impedance. Heated up to 75°C, with the exception of slight missing, it continued to work well on 6.5 mm. gaps at 8 volts. It appears from the above that the secondary is quite O.K. but that a small portion of the primary is short circuited, not sufficient however appreciably to affect the sparking of the coil. Coil No. 3009. The primary resistance of this measures quite low and the increase of secondary m.a. on A.C. with short circuited primary, is a much smaller % than in a standard comparison coil. There seems little doubt that quite a large portion of the primary winding of this coil is short circuited. Mr. Brock Has now provided us with further coil cases in Redmanol material which so far appears to be immune from the faults, at temperature possessed by mouldensite and other similar products. EFC. {E. Fowler Clarke - Electrical Engineer} | ||