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).
Comparison of three experimental batteries (Exide, P & R, and C.A.V.-Willard) for the Goshawk project, with a recommendation to proceed with production of the P & R battery.
| Identifier | WestWitteringFiles\I\July1922\ Scan111 | |
| Date | 25th July 1922 | |
| Contd. -3- EFC2/T25.7.22. With regard to batteries for the Goshawk, of those under serious consideration, viz., (1) The Exide 6XMS. (2) The P & R, of which several sample batteries are being made up for us. (3) The C.A.V.-Willard 12 XMS. the P & R will probably have the largest capacity, say 50 ampere hours, whereas the other two are rated at 45. The reason of this will be that the P & R Co., having the opportunity of making these batteries to suit our own dimensions are utilising the space in the best possible way. For this and other reasons, e.g. Dagenite cell boxes, it is considered that the P & R batteries will be quite the best proposition for the Goshawk, and we would like now to recommend that without waiting for these three experimental batteries, an order should be placed with them for a number of these batteries for production. The reason is that we have gone over all the points of construction of details thoroughly and it is very unlikely that these will require modification, and as regards the performance, this cannot really be finally settled until a number have been run on the road. With regard to the other two batteries, so far as we have gone, these appear to be equally good though there is a suggestion from some of the experimental results that the internal resistance of the C.A.V.Willard threaded rubber battery is increasing with use. In the first instance, however, their resistance is rather lower than the Exide so Contd. | ||