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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).
Standardising the battery for the 40/50 chassis, comparing Peto & Radford and Exide models.

Identifier  ExFiles\Box 38\5\  Scan224
Date  22th June 1922
  
V3398

To R.{Sir Henry Royce} from EFC.
c. to CJ. & BJ.
c. to Ey.
c. to EP.{G. Eric Platford - Chief Quality Engineer}

EFC3/T22.6.22.

RE STANDARDISATION SHEETS FOR 40/50 CHASSIS
ELECTRICAL EQUIPMENT.

X.3398 - Peto & Radford type ED.{J. L. Edwards}11 Battery.)Proposed as simul-
X.4130 - Exide 6XMD Battery. )taneous standards.

Sheets for these have been signed "agreed" by Wor.{Arthur Wormald - General Works Manager}, Rg.{Mr Rowledge}, Ey., EP.{G. Eric Platford - Chief Quality Engineer}, and PN{Mr Northey}, but Da{Bernard Day - Chassis Design}'s remarks are "There does not seem sufficient evidence that the existing battery is too small to justify the increased weight".
CJ. remarks "What has R.{Sir Henry Royce} to say to Da{Bernard Day - Chassis Design}'s criticism".
BJ. " "Does R.{Sir Henry Royce} agree the extra weight is Necessary".

Independently of the two latter, R.{Sir Henry Royce} has remarked,:-
re the Exide battery, "agreed, but if P & R battery has done so well, why use Exide, but be sure", and re the P & R battery "agreed. Though 1lb heavier, costs less - how ?"

Regarding the size of the battery, although this is naturally very largely the matter of opinion, it appears to us that the weight of evidence decides that the present standard battery is somewhat too small. As is known, we have had a good deal of trouble with 6 EXE5 Exide batteries before certain improvements have been made, but in a great many cases this has been put down to the high rate of charge of the Lucas dynamo, viz. 12 or 11 amps., even at high speeds, this high rate causing disintegration of plates.
The same rate of charge would be proportionately less on a larger battery and some of the output of the dynamo would be stored as against the other extreme condition of night use in town.

It will be remembered that the output curve of the Lucas E.575 generator does not fall appreciably with increasing speed, but 12 or 11 amps. is maintained if the charging switch be kept on, even at the high rates of speed obtained in country running in the day-time.

The use of a dynamo with an output characteristic which falls somewhat with increasing speed, if the amount of falling off is not overdone, would appear to effect a slight improvement, but the amount of falling off has necessarily to be a compromise between the conditions of fast running in the day-time and fast running at night, in the latter case it being not desirable that the battery is discharging (to assist the dynamo with the load) at more than, say, 2 amperes.

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