The fixed pitch flat bottoms are a one of a kind solution to the most common problem of smooth fast forward flight with fixed pitch micro Helis. When you rest these blades on a desk you will notice that they are flat all the way through the bottom of the blade and yet the upper root mount is twisted in order to allow for the fixed pitch application producing the angle of attack. This combo allows for a super smooth none “nose pitching” blade while maintaining a fixed pitch application. The blades are also super light so they reduce the work load off the main motor. The blades come pre covered so installation is a snap. Now you can literally fly a fixed pitch machine with smoothness resembled in collective pitch machines.