Astro Tech - Big Props = Big Challenge

For maximum flight time you want to run the largest props you can at their optimal RPM. Astro uses 21 inch props on a drone body that is only 55 inches tip-to-tip size. 96.2% of our total drone area is swept prop area. So why doesn't every drone use such large props?
As you increase prop size it becomes more and more difficult to accelerate and decelerate the prop, ever notice how FPV drones use absurdly small props? They trade prop size / flight time for control bandwidth.
On Astro we spent years developing motor drive HW and control algorithms that allow us to have both huge slow spinning props with incredible stability. This allows Astro long flight times, incredible precision, and super low noise footprint.
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[@SkyPathProductions]

200,000 rotations per second?? That is like impossible fast… can someone explain?

[@tortenhebu]

To convert 200,000 revolutions per minute (RPM) to revolutions per second (RPS), you simply divide the RPM by 60, since there are 60 seconds in a minute.
Here's the calculation:
[ 200,000 , \text{RPM} \div 60 = 3,333.33 , \text{RPS} ]
This means that 200,000 revolutions per minute is equal to 3,333.33 revolutions per second.