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).
Extract discussing the specifications and advantages of a larger condenser for Goshawk battery ignition.
| Identifier | ExFiles\Box 52\3\ Scan003 | |
| Date | 27th September 1921 | |
| R.R. 291A. (100 T) S.H. 785. 10-12-29. G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 2947 x 4430 X. 3485. Extract from EFC {E. Fowler Clarke - Electrical Engineer} 2/T27.9.21. X. 2512 - CONDENSERS FOR BATTERY IGNITION. X.3485. With regard to the condenser for the Goshawk battery ignition, we estimate the allowed useful volume of this to be 1.27 cu.ins. If therefore, we estimate the same space efficiency as we obtain on the 40/50 chassis condenser, namely, .244 mf. per cubin inch, this will give us a capacity of .31 mf. We welcome the possibility of being able to use a condenser of rather larger capacity for the Goshawk since wxperiment has pointed to the probability that the larger condenser will be an dvantage, particularly so owing to the proposed reduction in the amount of the ballast resistance. We think that the ignition on these lines will be found to be at least as satisfactory as that on the 40/50 chassis. We reported in our EFC {E. Fowler Clarke - Electrical Engineer} 2/T5.9.21 that we found the Bosch condenser to heat up due to di-electric losses on 200 volts A.C.50.~, allowing quite a larger leakage conductance. | ||