I would love to see that happen, I would love for it to be me but not in an ez. there was a day when I would have done that but after flying an ez now for many years I have come to realize that it is not the airframe to experiment with an engine. the off field landing success rate is not good. we see aircraft accident reports almost every day about aircraft that have come down out of the sky without power and many are aircraft engines. it is not usually the engine but the support system that fails. so to really test your new relatively stock rotary engine safely you would need a different airframe. so that is simple, just build a slow flying pusher with off field landing capabilities in which to test your new engine, test the engine and then install it along with all the exact same support systems in your newly completed beautiful cozy IV. so lets recap, to get a good reliable rotary engine in a Cozy all we need to do is build another plane, build a test engine, test it for many hours, install the exact same engine in the cozy, test it for many hours and then go flying with your family in your still and always to be experimental airplane with its experimental engine system. so it is easy to see why after someone spends a small fortune and half their adult life on an aircraft that they have dreamed of flying some day does not go with the rotary engine. even many of the few that did dream of the rotary and some of the ones that did install a rotary made a decision if they are going to fly their new Cozy in good health that they best put in a more proven reliable engine system. I applaud the ones that will install a rotary system, the ones that fly one and even the ones that have had their own reality check and choose to make theirs a hanger queen.