Questions tagged [opener-blackfly]

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Is NASA's X-57 using a fan, a prop, or a prop/fan and what is the difference visually/physically?

Is the NASA's X-57 or the Opener BlackFly using a fan, a prop, or a prop/fan and what is the difference visually/physically? NASA X-57 Maxwell, courtesy of Wikipedia Opener BlackFly v3 courtesy of the ...
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With 77% less wing area than the Lazair Ultralight, how does the Blackfly meet FAA ultralight category requirement of power off stall speed of 28mph?

With 77% less wing area, how does the Opener BlackFly do a power off stall at less than 28mph (or fly with no power at 28mph)? I understand the Lazair with 140 sq ft of wing area, was able to fly at ...