Paul:

I have been totally fascinated by the illustration you recently posted,
"Wankel-Variations.jpg"

Although there would appear to be significant power advantages from some
of the rotary variations, it appears that the weak link in most of the
designs would be problems with sealing.

However, the lower-left option seems to be a very good option for
building a rotary engine. Machining would be easy. Seal-stress/wear
would appear to be minimal. Any idea of why this "simpler" design was
not used?  Compression-ratio perhaps?

Robin


You got me. I would have to redraw that in all its positions.
I suspect there may be no way to get all four cycles.

Paul Lamar


True ... not without a valve system

Rob