The question is simple, the answer is not. Weight and aerodynamic drag, whether drag as a result of movement through the air mass or drag resulting from the prop-wash. All are negative factors the motors have to overcome.
And now to my soapbox
Look at the design of
most rotor-craft and you may see they are designed in such a way as to minimize the down-force of the prop-wash, as well as the drag resulting from forward movement through the air mass.
My prop guards are not an airfoil. The design of the stock DJI Phantom prop guard is very crude. There appears (to me) to have been no attempt whatsoever by the designers to create an airfoil either.
Perhaps (key word
perhaps) the theys who designed the prop guards were attempting to ensure prop guards would not become an airfoil. I can't think of a shape which would work to the phantom's advantage in the infinite flight attitudes "my" phantom achieves. The best I can come up with, in my mini-mind, is a cylindrical shape.
This is my soapbox and I have the talking stick.
I love my prop guards. I'm holding one right now.
If you ran your machine into as much stuff as I have mine, you'd be in love with yours too. See my "IMPACT" page. It's new and there's just one link at the moment.
My prop guards have had a significant affect on my flight times. I get to fly and fly and crash and fly and fly and bump into stuff and fly and fly. Without them I would spend more time doing repairs than flying. I don't ever need a band-aid because of an aggressive prop. :mrgreen: