True, must have missed that, deep branches on higher rated sibling comments. And at the time when I did skim the actual grandparent, I dismissed the part about

True, must have missed that, deep branches on higher rated sibling comments. And at the time when I did skim the actual grandparent, I dismissed the part about piston because I don't believe that any of the suspected benefits of this pressed air disturbance control scheme could ever be meaningful in the realm of piston-engine drones. Control surfaces are cheap.