So if your wondering what the heck is with that blade here it is. The blade is  in the shape of a suction cup so it can catch more air. We haven’t had a chance to test out the suction cup blades.I came across this idea when I put my handout the window of the car. Then I cupped it. I found that  it was harder to move my hand ford than when it  was flat. I have high hopes for this idea. Hope you enjoyed this post.