Using values to derive the general shape of a rotor

[NoDOHC]

You are confusing yourself by thinking too hard. The eccentricity measurement you seek is actually the distance that the eccentric shaft is offset from center. (15 mm).

The R' is the distance from the center of the eccentric shaft to the intended apex of the rotor. These constants describe the rotor housing by a set of parametric equations.

I have a parametric equation that I developed empirically by carefully measuring a rotor a while back. It should be pretty close (it yielded a net displacement of 653.8 cc per eccentric shaft revolution per rotor).

I can get it to you, but it will require some explanation, as it was developed for a math model of the rotary engine that I was working on at the time. It is a function of R in terms of some theta (which I don't remember what angle theta represents now).

I will PM you once I get to the bottom of this math.