Hobie, congratulations, great that you love the Twist. Rick, one of our flying buddies, has an OS AX and is using the 12.25 x 3.75 APC prop. He loves it. He also has a re-built Twist with a Super Tigre .45--with the same prop. Does well. His teenage son is showing us all up with that bird.

And read my review of the Twist PNP, with the Evolution .46. I changed out of the break-in prop and put the 12.25 x 3.75 APC on her right away. So the answer is, yes, your AX will handle the APC 12.25 fine. Just watch the heat and the weather. The new prop won't "challenge" your flying in any way. You may not notice ANY difference, but you WILL have to retune the high end. You may notice that the 12.25 spools up slower than the 11x5.

If you're not hovering, you won't notice much difference 11x5 versus the 12.25, but the latter is, in a sense, a lower gear. You won't take off as fast with the 12.25, nor go as fast in the air (you don't want speed with a Twist). So the changes will not be great, the flyability unchanged. But see for yourself and let us know.

Best wishes,

J