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A comment on U.S. proposes to allow drone operation at night, over people. Parent comment

Re:U.S. proposes to allow drone operation at night, over people by toufiqbarhamov on Monday January 14, 2019 @09:28PM (#18908422)
Oh sure, but the glider is moving through the air at a stately pace (generally between 50-95mph), shedding vortices without anything coming behind them to crash into them. A prop operates at much higher speeds, typically between 450-720mph!
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Re:U.S. proposes to allow drone operation at night, over people by mikeash on Monday January 14, 2019 @09:46PM (#18908507)
Really? I arbitrarily looked up the DJI Phantom 3 and found a max RPM of about 8000 with a prop diameter of 9 inches, which gives a tip speed of about 200 MPH at the most.

That’s still pretty fast, of course. That points to using bigger props as a potential way to cut noise.

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Re:U.S. proposes to allow drone operation at night, over people by toufiqbarhamov on Tuesday January 15, 2019 @12:49AM (#18909096)
You’re right, I was looking at max motor rpm, whoops!
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