As you can see, DASH was not a big aircraft, and its counter-rotating rotors eliminated the need for a vertical tale rotor to stop it from spinning like a top . . .
More about DASH from its manufacturer, Gyrodyne from which the above photo was liberated with a hat tip. The DASH history is of particular interest.
As noted a couple of years ago here, such aircraft are not a new idea, though the electronics have improved considerably.
Background of the TDR Drone.
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