QAV250 motor mount extensions - Various angles - Run 6" props AND shift your COG forward or back. First let me say that these are NOT tilted motor mounts to angle your motors forward. These are all flat extensions, but they're angled in relation to the arm is either 0, 15, or 30 degrees. The 30 degree mounts are angled at 30 degrees in relation to the arms, which makes them perpendicular to the body. The straight extensions are just like they sound... they follow the angle of the arms. And the 15 degree mounts allow you to mount the motors 15 degrees forward or back. The pictures explain this better than my words can. I haven't seen anything like these available anywhere, and since testing has shown that they work pretty well, I figured others may benefit from these. I'm currently running perpendicular front mounts and 15 degree angled mounts in the rear. This shifts the COG back by about 10mm. I can now run larger batteries without putting more weight/strain on the rear motors. There are many options with these to allow you to shift your COG either forward or back. Of course, you can also choose all 4 mounts of the same type... i.e., four straight mounts, or four 30* (perpendicular to body) mounts and run 6" props WITHOUT shifting your COG. There are TWO versions of each type. One includes an integrated motor guard, and the other one does not. I run the ones with motor guards and I imagine most people will do the same, but if for some reason you don't want the guards, you have that option. These are 4mm thick and should be printed @ 100% infill. They are plenty stiff this way, and while they WILL break under very hard impacts, they tend to take the brunt of the force, which typically saves the carbon fiber arms. (Not always though! I broke an extension and the CF arm on my last outing when the quad dropped from about 30 feet straight onto concrete). EDIT: Video added of my first test flight with the extensions https://www.youtube.com/watch?v=U_T3IOoqansPrinted in ABS @ .3mm layer height and 100% infill