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So...I've been looking over all the things I never had time to finish when I was in school. Looks like I have a lot to get back to work on. Among which I have a parametric equation I think everyone would be glad to have:
x=e*cos*al+R*cos(al/3)+a*cos(al/3+d)
y=e*cos*al+R*sin(al/3)+a*sin(al/3+d)
R=105 mm
e=15 mm
a=3 mm (I'm not 100% on this one)
d=26.2
Change al = t in inventor and plot from 0-1080 (degrees). That will give you the rotor housing; from which you can develop a rotor.
Now to scour for the internal dimensions of the rotor...
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