Whiffles commented on a Build, Catalyst 4R   Mar 29, 2017  
1

I'm tempted to do a 4" build myself. It seems those BH 1407s are the go-to for both 3" and 4" builds.

RotorQuad Squad   Mar 29, 2017 
1

as long as your quad is light and you are spinning a light prop they work great