I wonder if zivko aviation will ever come out with a edge 720? the edge 540 hasthe 540 on as we all known because of the lycoming io 540. Now there is a lycoming io720 8 cylinder. I wonder if zivko could shoe horn one of those babiesin to a edge 540 and call it the 720. I think it could really hover!! And maybe even tail touch. Im not an expert at thrust to weight ratios tho bu i do know somethings! i might have a wuick little sketch off my computer.