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).
Technical memorandum detailing the standardisation and testing of batteries for the 20 HP chassis.
| Identifier | WestWitteringFiles\L\July1924-September1924\ Scan50 | |
| Date | 9th September 1924 | |
| To R.{Sir Henry Royce} A E.{Mr Elliott - Chief Engineer} from EPC. c. CJ. & PN.{Mr Northey} c. HY.{Tom Haldenby - Plant Engineer} EP.{G. Eric Platford - Chief Quality Engineer} DA.{Bernard Day - Chassis Design} ORIGINAL X.4414 - 20 HP. CHASSIS BATTERIES. The three batteries which were adopted originally as standard for the 20 HP. chassis were :- (1) C.A.V.Willard, type 1RXM2. Weight 66 lbs. (2) Exide 6XRF. " 70 lbs. (3) P & R.{Sir Henry Royce} TBD7. " 80 lbs. The first of these three was dropped shortly after the start, because experiments and experience had demonstrated that it was inferior to the other two. The Exide battery was one of their standard types which very nearly suited our dimensions allowed in the rear of frame battery box. The P & R battery was arranged by Messrs Peto & Radford to suit these dimensions exactly, and therefore in reality should have slightly more capacity than the Exide, though the actual results on the two batteries show the capacity of each to be from 45 to 50 ampere-hours on the 10 hour rate. Recently a move has been made to get the Exide Co. to bring their battery into line with that of the P & R.{Sir Henry Royce}, viz. to make it exactly suit the dimensions and also to arrange for the cells to be similarly disposed and interchangeable with those of that other battery, to facilitate the problem of spares and replacements. In the early days of the 20 HP. arrangements were made that a set of seven batteries in our Elec. Expl. Lab. should be kept continuously on a life test. For the majority of the time, this battery would be charging or overcharging. Cont.d | ||