- Not only is this wing tree aerodynamic, it is very strong. Much stronger than our 30-075 wing tree. The wide but narrow cross section of the aero tubing in combination with the X that forms the cross brace, makes for a very ridged upright. Normally the wing motor, while pushing on just one side of the wing upright, will bind the wing due to the flex in the 30-075 upright. This aero upright does not do that.