Rolls-Royce Archives
         « Prev  Box Series  Next »        

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).
Dynamo output, comparing a Lucas machine to an in-house model and suggesting improvements.

Identifier  WestWitteringFiles\V\October1930-February1931\  Scan329
Date  11th February 1931
  
E/C. FROM E.{Mr Elliott - Chief Engineer}
C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager}
C. to MR. HS.{Lord Ernest Hives - Chair}

ORIGINAL.
re. DYNAMO OUTPUT.

E1/M11.2.31.
X6100
X6099

In reply to your memo. EFC1/AD9231., I still think it would be useful to obtain one of the simpler Lucas machines for analysis.

The dynamo on the Vauxhall has but two terminals.

It is a smaller machine than our 25HP. dynamo but it may weigh more owing to the use of cast iron instead of aluminium for the end covers.

We should like to know how the output compares with the improved RR. machine in course of construction on the 14 V.{VIENNA} basis.

We consider it is misleading to assess the weight of a machine purely on its peak output.

Our recent experience demonstrates the relative import-ance of other features such as that of early cutting in and maintenance of charge with speed.

Also the size of machine is of rather greater importance than its weight owing to the restricted room available under the bonnet.

We feel that no effort should be spared to improve our dynamo output until we reach the point where 60 watt lamps can be standardised.

We believe these will be required eventually on the 25HP. chassis as well as P. 2.

We suggest that in parallel with the other experiments going forward that dynamos for both RR. chassis should be in prepara-tion wound in the same way as the machine mentioned at the beginning of this memo.

We consider that even with automatic control it will still be found necessary for the ideal characteristic performance curve plotted on a speed basis to maintain a level output at all times shewing a positive charge of 2 to 4 amps. above maximum load - i.e. for road speeds of 20 MPH. and over.

E.{Mr Elliott - Chief Engineer}

(Stamp: RECEIVED 13 FEB 1931)
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙