I had one with an OS 91 Surpass. I could kick my own butt for selling it. The only thing I changed was to put 440 rods on the control surfaces and had to extend the muff to get outside of the cowl. This is a fine airplane. On calm days all I had to do to land was point it at the runway and chop the power. A little flair just before touchdown was all it took. I recently got a third scale and I hope it flies as well as this one.