At least they are a modern engine and parts availability shouldn't be an issue if the company succeeds. 

I'm pretty sure the company has already succeeded.  They appear to have made off with huge sums of investor money, with nothing to deliver in the near future as a product.  

        On the other end of the scale... Back in the early 70's when over a hundred manufactures built a snowmobile (Harley, Avon, to name a few, hmmm I wonder if Tupperware got into it?:-), there were a few with rotary engines in the 35-45hp range. Arctic Cat was probably the most successful of these. I did a search and found a link to one on e-bay but the link was dead. It may be fun to play with one of these but you'd better be good at making parts on that mill of yours! Not too sure I'd like to fly behind one.

 Thanks.  I knew there were a number of old versions of the engines out there, but as you say, parts would be a problem.  Even if you found several engines, like those auction engines I pointed out a couple weeks ago, you'd still end up needing O-rings and such, and would probably never find them.  

BTW, I never figured out who made those auction engines, but one batch of 5 engines sold for $10,900.  There were also several batches of 4 engines that didn't meet the reserve price.  

Cheers,

Rusty (the tourists are here)