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There is a floor set by Reynolds number, somewhere around walking speed, with the upper limit around 250 MPH. aerohead will have the citations.
Still can't remember the other example. It's a bubble canopy with a shark mouth air intake directly behind, rather than extended around the sides like the X-47. A NACA duct would be more efficient but lack the opportunity to revise the loft line.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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