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Hi Chuck Another loss of efficiency with conventional valve arrangements is the relatively cool exhaust steam taking heat from the cylinder and valve. Maybe a single acting V4 uniflow with piston or poppet inlet valves ?? Les

In theory you can’t lap straight involute gears because they mesh with a rolling action, therefore there is no relative movement between teeth for lapping to take place. In practice if the gears are mounted so that one can move from side to side you can sometimes improve things. With an idler...

E.T.Westbury designed a horizontal engine on the same principle (think it was the cygnet). The overhung crank pin has a spherical form on the end that engages in a radial hole in middle of the one piece piston. This imparts a rotary motion to the piston which has axial grooves to align with...

Hi Have you tried "cute pdf writer"? (freeware) It installs as a virtual printer,just select it from the printer drop down dialouge, and you can save almost anything as a pdf file. Cheers Les

Hi all, Retired today! Downside, I have to say goodbye to my myford S7 and Bridgeport, and try to get enthusiastic about some Chinese mini kit. Upside, Lots of time (and the spare room workshop has central heating). I started work nearly 50 years ago as a engineering apprentice, and finished...