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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).
Development strategy for synchro mesh and epicyclic gear units.

Identifier  ExFiles\Box 179\1\  img042
Date  22th October 1931
  
e.c. ) FROM R.{Sir Henry Royce}
ES. )
C.C. TO WCM. TA. F.{Mr Friese}

P. 2. - L.H. & R.H.
EASY AND SILENT CHANGE.

X7310.

You are quite right, we intended to go on with the synchro mesh for P. 2. I am not at all definite whether we settled that Derby should do the R.{Sir Henry Royce} H.{Arthur M. Hanbury - Head Complaints}, and LA{L. A. Archer}/DY.{F R Danby} do the L.H., but I know that I thought we must do the L. H.{Arthur M. Hanbury - Head Complaints}, as it would need some careful work which might not get enough attention at Derby.

The epicyclic unit we were examining was intended to be for P. 2., and to give silent gears and synchro mesh on all forward speeds. It will however take too long to get right so we must make P. 2. both right and left hand the same as the 25HP., and the more novel work we are engaged upon will stand by until this is done.

Derby can have a trial at the R.{Sir Henry Royce} H.{Arthur M. Hanbury - Head Complaints} while we are doing the L. H.{Arthur M. Hanbury - Head Complaints}, with exchange of drawings from time to time. We shall get both right fairly quickly now we have a good model in the 25HP.

R.{Sir Henry Royce}
  
  


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