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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).
Calculations and diagrams for the Goshawk clutch mechanism with M1 plug.

Identifier  ExFiles\Box 180\M4\M4.2\  img002
Date  7th February 1924 guessed
  
GOSHAWK CLUTCH
FOR CAMBER WITH M1 PLUG

TOTAL PRESS. ON PLATE (120 lbs / sq")
AREA OF FRN DISC = 31 sq"
PRESS. ON FRN DISC = 960 / 31 = 31 lbs / sq" (avg)

FOOT PRESS. TO JUST RELEASE CLUTCH

[Diagram with labels]
P
H
460 lbs
2.90
2.5
2.25
2.125

Press to just release clutch
= (460 x .75 x 2.25 x 2.75) / (2.9 x 2.5 x 14) = 44 lbs.
  
  


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