America has a problem with drones. If things stay the same, in a few months, the dominant brand on every best camera drone list, DJI, will be banned for political – not technical – reasons. American creators desperately need alternatives and, so far, the options are limited.
One new possibility has emerged, however. The Ascent Aerosystems Helius, that uses a relatively unusual coaxial design. That means there are just two counter-rotating propellors
