Yeah, the radical (for aircraft) engine is the big part of these performance projections.
I wonder about this layout because of the short couple (distance along the centerline) between the front and rear lifting surfaces. What would conventional aircraft behave like if the empennages were shortened five feet? Everything still works according to flight theory, but the leverage is so short that I would think constant correction would be necessary to maintain level flight and keep oscillating to a tolerable level. So does the Synergy require computer controlled guidance? Is it capable of not only flat spins but tumbling spins? Scary.
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