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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 on engine component ratios and their effect on forces and flywheel inertia.

Identifier  ExFiles\Box 13\8\  08-page8
Date  19th April 1934 guessed
  
(2)

If my conclusions are not correct perhaps E.{Mr Elliott - Chief Engineer} and H/TSN.
will write to me again on the subject.

I read Mr. ElliotT's memo. - r % : - = crank radius, l = rod length. If this is correct my calculation shews 33% difference between ratio 2 = 100% ratio 1.75 = 133%, or equal to reducing the weight of the piston rings and little end by 1/3rd., and also forces are 50% greater, needing 50% more inertia in flywheel for a given speed change due to this cause (i.e. not power impulses - gas pressures.)

R.{Sir Henry Royce}
  
  


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