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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).
Fitting a Terraplane cork clutch and spring drive, with a deflection curve diagram.

Identifier  ExFiles\Box 85\2\  scan0152
Date  5th February 1935
  
To RHC.{R. H. Coverley - Production Engineer} t u z Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}18/KW.5.2.35.

Clutch Spring Drives.

5-B-IV is at present fitted with a Terraplane cork clutch and spring drive. In spite of the very light flywheel no overrun rattles are apparent.

We should like to be able to fit a similar scheme to any Bentley clutch. Will you please therefore take particulars from the Terraplane & now dismantled, and scheme an exactly similar drive to fit in our standard clutch. We believe this type of spring drive has a deflection curve approximately as shown

[DIAGRAM]
Vertical Axis: DEFLECTION
Horizontal Axis: LOAD
Bottom Left Quadrant: OVERRUN SIDE
Bottom Right Quadrant: DRIVE SIDE
[/DIAGRAM]

Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}
  
  


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