[cobookman]

The report also shows it to have superior thrust to a traditional rotor for the same RPM.

https://www.thedrive.com/content-b/message-editor%2F16436679...

[dr_orpheus]

Although a better metric might be to look at the thrust to motor power and get an idea of its efficiency relative to traditional rotors. I can put larger blades on the motor and will get more thrust at the same RPM but the motors will have to work harder to push those blades.

[dTal]

Indeed, the screw shape is essentially a large number of rotor blades, welded leading edge to trailing edge. Undoubtedly it produces more thrust for a given RPM, and undoubtedly the efficiency is horrifically bad.

[whiddershins]

There might be times where longer blades would be less desirable though, could this have some niche use?

Also seems like the screw shape could be less prone to breakage.

[walrus01]

on a quadcopter or similar the useful metric is grams of thrust as measured instantaneously on a thrust stand vs watts consumed by the motor.

see users guide here for details.

https://www.tytorobotics.com/products/thrust-stand-series-15...

it's basically a load cell and an inline DC ammeter with some logging software.

usually denoted as g/w or kg/w on big things.