I recall Herbert specifically mentioning something about the action of his ornithopters’ wings in one of his later novels. Something about one particular ornithopter’s wings being controlled to a cupped shape (not flapping) prior to taking off via its jets (for lift, I suppose). Since then, I’ve often wondered if Herbert was responding to fans’ own doubts re flapping wing manned flight, and answered with a morphing-only wing. All of this would be an interesting question for his son.
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