RE: The OS 25AX is here
Here it is running on the test stand.
I'm running it with my 7.8x6 carbon fiber break-in prop because I trust it not to come apart and as you can see, these are close up photos. No zoom.
After a tank, the best it would do was 15,850. So it is not a 25FX killer. It is quieter than the 25FX and I think the muffler is probably a little more restrictive. I did not open it up.
I'm taking a family dinner break. Will put an APC 8x6 on it after another tank and see what it does.