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).
Results of an investigation into an Exide 6XNS battery for the Goshawk Electrical System.
| Identifier | WestWitteringFiles\K\November1923\ Scan60 | |
| Date | 20th November 1923 | |
| C. G.W. to F.M. C. DA.{Bernard Day - Chassis Design} EP.{G. Eric Platford - Chief Quality Engineer} BY.{R.W. Bailey - Chief Engineer} H.H. ORIGINAL EFC1/20.11.23. X.4138 - GOSHAWK ELECTRICAL SYSTEM. In addition to our report EFC4/T7.11.23, sent under cover of our EFC9/TS.11.23, the results of the investigation of the Exide 6XNS battery, taken from 79-40, are now available:- There did not appear to be any faults in the nature of short circuits on any cells of the battery, but the capacity of the battery has been somewhat reduced. On a high rate discharge test, through a constant external resistance of .100 ohm, with the battery at a temperature of 16°C, the initial amperes were 102. Time to 100 amps. .75 min. " " 90 " 9.4 mins. " " 80 " 11.0 " The specification states that the current shall remain above 100 amperes for 5 minutes. The low rate discharge capacity, through a constant external resistance of 1.75 ohms, at an average ampere discharge rate of 6.5, was found to be 39.2 amperes, which perhaps is not so bad, the battery being rated at 45 ampere-hours on the 10 hour rate, i.e. 4.5 amperes for 10 hours. This 10,000 mile run is not really much of a test on the battery, because the test was carried out in a short period of time. Contd. | ||