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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).
Revised method for joining the universal joint to the propeller shaft after a failure.

Identifier  ExFiles\Box 148\4\  scan0069
Date  11th March 1938
  
3/8 x 22 x 2
11 1/2 P
1262

RHS.
c.c. BY/Ch.M.
c.c. Rm.{William Robotham - Chief Engineer}

GRy{Shadwell Grylls}

BY.{R.W. Bailey - Chief Engineer}/G/11.3.38.

RE: JOINING UNIVERSAL JOINT TO PROPELLER SHAFT.

Referring to the propellershaft, which came adrift, being the second of this type to fail, after giving this matter careful consideration I am satisfied that we have not a sufficient number of pins in the joint.

I have therefore decided that we will double the number of pins in the joint, use short 1/4" taper pins instead of long pins passing right through, but I would still like to continue with the sweating as a further safeguard.

In putting in the short taper pins it will be necessary to machine ream the holes to a gauge, so that each pin when inserted by hand stands between .050 and .075 clear of the tube, it should be then driven in until the head is flush. This will ensure a good fit on each pin, and the number of pins will be sufficient to take the drive.

FJH{Fred J. Hardy - Chief Dev. Engineer}

Weld the tube where bitten hard for trial G.Ry

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


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