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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).
Standardisation and performance of a mushroom type H.T. rotor, noting issues with corrosion.

Identifier  ExFiles\Box 32\5\  Scan065
Date  2nd November 1927
  
To BY.{R.W. Bailey - Chief Engineer} from EFC.

X6096

EFC/T2.11.27.

MUSHROOM TYPE H.T. ROTOR.

May we refer you to our general report EFC/T 22.10.27. in which it was suggested to R.{Sir Henry Royce} that the mushroom rotor be provided with vanes to cause a definite impelling effect on the air in the distributor head. We have seen a mushroom rotor of this type on a jump spark distributor of an M.L. magneto.

My present point is that as we have not received an answer from R.{Sir Henry Royce}, do you think this might be instructed in the Drawing Office ? We would like to get a number of these running with a view to standardisation owing to cases of failures we have had with the present rotor, but our experiments have shown that we have not got the advantage in the direction of reducing corrosion with the present mushroom type rotor over the standard rotor.

EFC.
EFC.
  
  


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