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).
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} | ||