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very stylish model and beautiful valve gear, simple and classy!as regard conrod length, five times the crank length is requiered for a sinusoidal movement of the piston, symetric, otherwise, with a short conrod the piston stays longer at bdc, which may impair the regularity of the movement of a double acting engine.
Thanks for the commentsChris, I was in two minds whether to mount the cylinder on it's side and do away with all the extra linkages but in the end stuck with the Stuart layout which as you say does add a bit more interest visually.If anyone does buy Ron's castings keep a look out for the build thread of this which will have drawings for the parts that will not fit if built to Stuarts drawings or the ones in both editions of the book.