@article{Molnár_Szirmai_2009, title={Generalized polygonal Wankel engines}, volume={37}, url={https://pp.bme.hu/tr/article/view/1856}, DOI={10.3311/pp.tr.2009-1-2.05}, abstractNote={The trigonal Wankel engine is kinematically based on the motion
where a circle <I>p<sub>m</sub></I> of radius 3<I>d</I>, as the moving pole curve, rolles
on the circle <I>p<sub>s</sub></I> of radius 2<I>d</I>, as the standing pole curve in the
interior. Then the regular trigonal rotor with circumcircle of radius
<I>ρ > 3d</I>, fixed concentrically to the moving pole circle, describes its
orbit curve <I>c<sub>ρ</sub></I> This orbit curve <I>c<sub>ρ</sub></I> is crutial in forming the
engine space.
Answering a question of István Revutzky, we prove (and
animate by computer) that <I>c<sub>ρ</sub></I> is a convex curve iff <I>\rho </I> bigger or
equal to 9<I>d</I>. The parallel curve <I>c<sub>ρ+r</sub></I> with distance <I>r</I> will be the
solution to the engine space if the triangle rotor touches <I>c<sub>ρ+r </sub></I> with
small roller circles of radius <I>r</I> centred in the vertices of the triangle.
All these concepts will be generalized - with animation - to a
k-gonal rotor (2 < k natural number) in a unified way.
}, number={1-2}, journal={Periodica Polytechnica Transportation Engineering}, author={Molnár, Emil and Szirmai, Jenő}, year={2009}, pages={29–32} }