Gary,
I don't know enough about them to know the difference.  What about
weight, are they the same ?  200-220 hp would be fine for a fixed wing
that I will build.  I read they were exported (imported into the US)
only, so what about parts ?  The price is right, but what if it costs
more than a 13b just to get it ready to go.  Tangential....what is that
?  Do you have pictures ?  Thanks for your input.
Kevin