I've ran so many engines over the years I can't count them. While not saying your claim is false, I find it extremely unlikely that an ASP .40 could turn a MA 10X6 at these RPM.

Jett makes some of the finest engines on the planet. His FIRE 50 is advertised to spin an APC 10X 6 at 17~18K. He verifies this before he ships one. For an ASP to beat a Jett FIRE 50 by 4.5K (albeit on a different brand of 10X6) is astonishing.

You ASP also bests the Jett .60L by 4K on a 10X6 (again an APC).

Then again you are out performing basically every other engine on the Jett website, so I guess I shouldn't be surprised.

I'm running a fairly well modified Rossi RIRE .65 with an APC 9X8 and only get 21K. In my experience the 9X8 and 10X6 are fairly close to each other as far as RPM. For an APC 40 to out-turn what is basically a Rossi .65 fan engine on a pipe by 1500 RPM is just simply amazing.

I run a pair of modified OS 46 VF engines with 9X8 APCs and they both turn about 17~17.4K on pipes. This is an extremely good number for an OS 46VF. Again, hearing that an ASP 40 is more powerful by an estimated 5K is just incredible. I worked these engines over to get a measley 1.2K gain, to see 5K more would be a feat beyond imagination.

And I do own an ASP .46 on a pipe...mine is not a particularly powerful engine.