Insitu Debuts Vertical Takeoff System For Integrator UAV

Insitu, the Boeing owned developer of autonomous systems has revealed a VTOL version of its Integrator uncrewed aerial vehicle or UAV. The new aircraft, which the company calls Integrator VTOL combines the conventional Integrator airframe with a separate system to enable vertical takeoff, known as the Flying Launch and Recovery System or FLARES.

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[A.F.I.S.]

I can’t understand in any way what is the advantage in the tandem propeller scheme? And why is the same distance always taken between the propellers in this scheme? There is another version of the propeller and more productive than the tandem scheme, invented by the Chinese in their taxi and taken as a basis. In the Chinese tandem scheme, a pillow of air is created between the propellers. One screw during operation drives air down. When two propellers work in tandem, one should work (upper) at a speed less than the lower one. And this is a huge minus. Look at Elon Musk's platform. It has multi-blade fans as propellers. Is it so hard to guess that fans are the future, not propellers. -