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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).
Phantom III propeller shaft failure, attributing it to faulty sweating and detailing a design alteration to increase pin diameter.

Identifier  ExFiles\Box 94\4\  scan0165
Date  6th April 1938
  
RHC.{R. H. Coverley - Production Engineer}
Rm.{William Robotham - Chief Engineer}
c. Hs.{Lord Ernest Hives - Chair}
337.
BY.9/N.6.4.38.

Re: Phantom III - Propeller Shafts.

Referring to your memo RHC.{R. H. Coverley - Production Engineer}1/MC.4.4.38, pointing out the failure of the propeller shaft was due to faulty sweating, and not a question of design, I agree to retaining the same number of pins, but increasing the diameter from .250 to .312 and we are issuing an alteration covering this.

BY.{R.W. Bailey - Chief Engineer}
  
  


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