The Supercat is an Ultralight from the mid 80’s powered by a 50 hp Rotax 503. It’s similar to a Mini-MAX and Volksplane,
The EAA has quite a few sport aviation articles on the aircraft, more info at:
While I don’t believe I’ve seen one of these in person at the airport or air show the Outerzone article caught my eye.
There is a 54″ span version from the May 1988 issue of RCM