I looked at some of the numbers on their website, discounting anything they did not show a photograph of. If they are actually getting 91 kg (200 lbf) static th

I looked at some of the numbers on their website, discounting anything they did not show a photograph of. If they are actually getting 91 kg (200 lbf) static thrust with a 75 kW engine, that would be in the low-to-average range for small-airplane propellers at the same power level - quite impressive as a starting point, but such propellers are far from suitable for VTOL (small helicopters seem capable of producing ~450kg (1000 lbf) lift/thrust from that power.)