yes, I have been looking into todays vtols, they either have a complicated large merry go arround rotor system or a very very highly concentrated plumes of air as in the harrier/F35 jet

both are very expensive to maintain, complicated and yet not so practical unless in military.

so some kind of a propeller/ fan/ rotor with no moving part must do the job somehow to get rid with the complexiity and cost and SPACE!



I was just thinking of testing a thick-chord fan with 4 blades and a medium AOA. it should be geard to the motor unless the motor has a very high torque. My idea is that efficiency should go up when one use a geared system

example:

my model vtol/thrust test rig weights around 700grams and teh thrust is around 880g, the power from the electric motor is around 166w

the propeller is a standard slowfly 10x4,7
rpm is around 7000-8000
if we instead took a 7 inch impeller with larger blades moving more air at one revoltuion , i tmeans it makes more drag and resistance to the motor shaft.. now if one calculate the required data and put reduction gear to the motor. the thrust out put should be equal at less rpm and smaller propeller and with the same efficiency!

I could be way wrong but that is just what i think could be possible