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).
Test results of an Exide 6XR3 battery for the Goshawk Electrical System.
| Identifier | ExFiles\Box 51\2\ Scan158 | |
| Date | 20th November 1923 | |
| X4338 To R & E. {Mr Elliott - Chief Engineer} from EFC. {E. Fowler Clarke - Electrical Engineer} c. CJ. & PN. {Mr Northey} c.DA. {Bernard Day - Chassis Design} E. {Mr Elliott - Chief Engineer} EP. {G. Eric Platford - Chief Quality Engineer} c. BY. {R.W. Bailey - Chief Engineer} Hm. {Capt. W. Hallam - Head Repairs} EFC {E. Fowler Clarke - Electrical Engineer} 1/T20.11.23. X.4338 - GOSHAWK ELECTRICAL SYSTEM. X4414 & In addition to our report EFC {E. Fowler Clarke - Electrical Engineer} 4/T7.11.23, sent under cover of our EFC {E. Fowler Clarke - Electrical Engineer} 9/T8.11.23, the results of the investigation of the Exide 6XR3 battery, from 79-AO, 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 the 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 at 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 ampere-hours, 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. 10,000 mile run This, however, is not really much of a test on the battery, because the test was carried out in a short period of time. Contd. | ||