Responding to Mr. Elliott, discussing the relationship between the rod length to crank radius ratio and its effects on engine forces and flywheel inertia.
| Identifier | WestWitteringFiles\V\October1930-February1931\ Scan217 | |
| Date | 4th June 1934 guessed | |
| (2) If my conclusions are not correct perhaps E. {Mr Elliott - Chief Engineer} and HS {Lord Ernest Hives - Chair} /TSN. will write to me again on the subject. I read Mr. Elliott's memo.- l/r :- r = crank radius, l = rod length. If this is correct my calculation shews 33% difference between ratio 2 = 100%, ratio 1.75 = 150%, 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} | ||
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).