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 report on the suitability of a Lucas Type STXR9A battery, concluding it is inferior to others tested.
| Identifier | ExFiles\Box 164\3\ img176 | |
| Date | 8th June 1938 | |
| To By. {R.W. Bailey - Chief Engineer} c. to Ba. c. to By {R.W. Bailey - Chief Engineer} /RB. {R. Bowen} c. to Roy {Sir Henry Royce} /Les. 6021 Rm {William Robotham - Chief Engineer} /RC. {R. Childs} 7/JH.8.6.38. re Test of Lucas Type STXR9A Battery. In order to ascertain the suitability of any battery for use on our cars we have evolved the following schedule of test - (1) Starting Capability test. (2) High rate discharge test. (3) Life test. (a) On the bench. (b) On the car. We consider that the starting capability of a battery is of first importance and that it must be satisfactory in this respect to justify further consideration. We have arrived at this conclusion as a result of recent cold starting tests on the late 'Wraith battery'. Test (1) consists of discharging the battery at 280 amperes for 5 seconds, the terminal voltage at the end of this period, giving a measure of the speed at which the engine will be turned under extreme conditions, also of the available voltage for the ignition circuit. In respect to test (1) the Lucas STXR9A (9 plate) battery is inferior to any other battery which we have recently tested. | ||