Mine flew like it had a piano stuck in the cowl with the 55AX. Just couldn't get it to fly stable and ended up loosing it on the third flight. Checked the balance after the first two white knuckle sorties, and balanced to the tail as far as I could. Still couldn't keep the nose up at less than 3/4 throttle and heavy elevator. I'm wondering about the down thrust now that I've read this. It's obviously gone now, but anyone have any experience similar? I can't imagine even trying 3D with the lack of low speed stability I saw.