Should be a perfect match for this plane. The FG-11 I have is based on a FA-62 case which is smaller than the OS-70, so I had to modify the way it mounted. The Magnum 91 and Saito 100 both dropped right onto the mounts. As far as weight goes, the FG-11 weighs the same as the FA-100, and I added no dead weight to balance it, so the 70 should come out pretty much the same. I flew it on a 13x8 APC.