The practice of pinning piston rings and its effect on gas-tightness, referencing the 40/50 and Hawk engines.
| Identifier | ExFiles\Box 33\3\ Scan239 | |
| Date | 6th January 1923 guessed | |
| contd:- -2- America had abandoned pinning the piston rings. I think this would reduce efficiency of gas-tightness, and occasionally become disastrous unless a more complex ring was used. Personally I am entirely in favour of a large number of narrow simple rings alternately pinned at right angles to the piston pin, the pinning being slightly staggered to break the joint. This is our 40/50 practise, and but I am not sure what pistons are on the Hawk(Aero Engine) engine (Hawk(Aero Engine)-Northcliffe, not Goshawk(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine))) which is here. They seem extremely good. 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).