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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).
Broken frame on a Goshawk 11 chassis after a bump test, with recommendations to improve material quality and thickness.

Identifier  ExFiles\Box 119\2\  scan0152
Date  12th December 1921
  
Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce}
c. to BY 1/2
c. to HL.
c. to CJ.

X4268

R4/M9.12.21.

BUMP TEST ON GOSHAWK 11. CHASSIS. G.4260
X.4219 x4268

In reply to your Hs{Lord Ernest Hives - Chair}2/LG2.12.21., the broken and
sagged frame suggest materials have not a sufficiently high
EL. We must get better quality frames. I am also suggesting
slightly increased thickness; those broken are .125, so I
propose to increase this to .156 or slightly more, but we must
have metal in a better state to resist fatigue, unless your
tests are too severe, as the frame is a very carefully propor-
tioned one and ought not to fail, but it is good to know where
it will fail so that we can do something to improve the parts,
and also demand metal in a better state to resist fatigue.

I have come to the conclusion that the broken frame
near the front dumb iron is caused by torsion in the spring
being conveyed to the frame which is weaker in torsion than
the spring. An increase in the thickness and quality of
metal of the frame should make a definite improvement.

R.{Sir Henry Royce}
  
  


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