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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).
Modifications and cost reduction for Phantom III and Spectre crankshafts.

Identifier  ExFiles\Box 93\5\  scan0111
Date  1st October 1935
  
To E.{Mr Elliott - Chief Engineer}
C. to SG.{Arthur F. Sidgreaves - MD}
C. to WGR.
C. to By.{R.W. Bailey - Chief Engineer}
C. to RHC.{R. H. Coverley - Production Engineer}

+317

Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}15/KW.1.10.35.

Phantom III Crankshafts.

With reference to E.2/HP.28.9.35, whilst we are anxious to urge any experiments to reduce the cost of the SpectreCodename for Phantom III, we do not think that we can get a crankshaft to LeC.4597 on the next SpectreCodename for Phantom III going to France.

This design is of course not yet detailed, but as far as we can see it means an alteration to the crankshaft dies. If we altered the dies and then found that we ran into trouble due to the reduced balance, it would mean that either new dies would have to be sunk which might delay production, or that the additional material would have to be machined off the modified forgings.

We have so many modifications going through at present that we consider it would be better for this crank to follow on when the first series of SpectreCodename for Phantom IIIs have been manufactured. If this was done, the crank could be manufactured from the solid without upsetting the dies.

Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}
  
  


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