The absence of a rear rotor on the kid to counteract the torque of the back-mounted blade tells us that the Professor has made great strides in aviation, or more likely this is just more Hanna-Barbera crap. They fly around looking for Dr. Spyklops, perhaps expecting him to wave his arms and shout DOWN HERE! They find nothing. Perhaps because they're flying around at the altitude level of mountain tops? Just a thought.