I put the HS-81's in mine as soon as I got the plane. Finished the build put in a 2100 lipo to set up the plane and smoked the ESC. Not even one flight. I put a Great Planes sliver 25A in. Works great. Sent the origional back, but I think it will end up as a paper weight when I get it back. I'll put it with the origional servos.