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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 design for a Goshawk 11 spring drive, referencing drawing Lec.1727.

Identifier  WestWitteringFiles\K\June1923\  Scan1
Date  2nd June 1923
  
ORIGINAL
TO BY.{R.W. Bailey - Chief Engineer} FROM E.{Mr Elliott - Chief Engineer}

c. to GJ.
c. to HS.{Lord Ernest Hives - Chair}
c. to HT.

E3/M2.6.23.

GOSHAWK 11. SPRING DRIVE. X4223

We send herewith drawing Lec.1727. shewing the above revised with a view to overcoming the trou-bles experienced during the experimental testing of E52565.
You will notice that the friction plate and spring drive are madein one piece and mounted on a longer taper than was used before for the friction plate. It is essential that this piece shall be tight on it's taper and that this tightness shall not be balked in any way by the taper hub or securing nut being stopped up against shoulders or other features.
We think the revised construction of the spring drive makes the job less likely to be wrong because the complete unit is now placed in between the friction surfaces and depends on fewer dimensions for the important features involved. It should also be more easily seen whether the assembly is correct or not. We do not thinkit is possible to get the friction plate sufficiently tight by screwing up the ring nut provided, because the efficiency of this nut is only 3%. It will be necessary either to tighten the friction plate on it's taper independently by means of a central bolt or to assist the ring nut by means of pressure from a central bolt during tightening as explained on the drawing.
We have not altered the crankshaft beyond adding slightly to the length of the taper which carries the spring drive drum. This extra piece of length on the taper is acco-mmodated by counterboring the crankshaft nut. This alteration does not effectively interfere with the interchangeability of the crankshaft. This spring drive has to be removed in two pieces if it be desired to detach it from the engine when the
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