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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 and recommendation of three different battery types (Exide, P & R, C.A.V.-Willard) for the Goshawk.

Identifier  ExFiles\Box 38\5\  Scan236
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 6XRS.
(2) The P & R, of which several sample batteries
are being made up for us.
(3) The C.A.V.-Willard 12 XRS.

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 utilizing 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 be threaded rubber
battery is increasing with use. In the first instance,
however, their resistance is rather lowerthan the Exide so
Contd.
  
  


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