ROSS YOKE DRIVE FOR GAMMA STIRLING

[a.terzaghi.hy]

Dear all,
I am building a solar heated gamma stirling model, and I would like
to drive the pistons with a ross yoke : the problem is to calculate
the dimensions of the ross yoke drive having two different pistons'
strokes...
Is there anybody experienced who can give advices ?
thanks in advance !

[William Hornbaker]

Try laying out the drive at 4 or 5 times actual size. Make the horizontal distances on the linkage inversely proportional to the desired stroke(s). If cut out of poster board or card stock you can assemble with thumb tacks and test it to see how well that solves you problem.

[markombi]

Andy Ross's articles in Model Engineer say that the different strokes are obtain by simply having different arm lengths on the yoke, while the phase variation is obtained by varing the distance of the conrod connections and the crank pin. This mechanism allows a very wide range of possibilities - pure genius.
Cheers Mark