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 comparing the performance, weight, and capacity of Bensport batteries against standard and other models.
| Identifier | ExFiles\Box 58\4\ Scan109 | |
| Date | 23th June 1933 | |
| 86107. E.{Mr Elliott - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Wst. c. to Wor.{Arthur Wormald - General Works Manager} c. to Sg.{Arthur F. Sidgreaves - MD} c. to By.{R.W. Bailey - Chief Engineer} c. to PN.{Mr Northey} c. to Da.{Bernard Day - Chassis Design} Hs{Lord Ernest Hives - Chair}/Wst.8/MA.23.6.33. BENSPORT BATTERIES. We attach herewith blue prints showing curves of the high rate discharge tests carried out on various batteries in connection with the Bensport. These curves show, as reported verbally at our conference with Mr. Minchin of the Peto & Radford Co., that there is very little difference between the 9 and 11 plate from the point of view of the starter performance. It will be noted that both these batteries are considerable better than the present standard 20/25 7 plate battery. We have now weighed these batteries and we find the weights to be as follows:- Standard 20/25 81 lbs. Bensport 11 plate battery 76 lbs. " 9 " " 74 lbs. It will be seen that with the fully charged battery the weight is not reduced in the way we expected with the reduced number of plates, there only being a net saving of 2 lbs. instead of the 5 lbs. as expected but a saving of 7 lbs over the standard 20/25 battery. We give below a table showing the capacity actually realized on this battery taken at the 20 hour rate and 10 hour rate. Battery type. 10 hour rate. 20 hour rate. Dagenite 11 plate 60 70 Dagenite 9 plate 50 57.5 Exide 11 plate 65 72 " 9 plate 56 64 Standard 20/25 7 plate. 57 64 | ||