This is indeed pretty impressive performance - the amp draw is (almost) a show-stopper on this, though.
23 amps for even a 3 minute flight (beginner stunt pattern) would need to be a 3s, 1500 mah
battery. It's about 200 Watts, which is really out of the range of 1/2A anyway and the battery alone
is about twice the weight of what we are currently trying to get by with (2s, 800 or 900 mah). That doesn't mean it wouldn't work, just that you have to factor that kind of weight (remembering that we are already at 8-10 ounce planes) into the wing area calculations, etc.
My own efforts are to make do with less motor and less battery, and never mind the 6-inch prop
"rule" - that was just for one contest, which I probably won't make it to anyway. I have a 1/2A
Skyray (with built up wing) flying pretty well on a $15 motor, but flies best with a 7-4 or 8-3 prop.
I did mess around with a 6-6, and I suspect that 6-3 or 6-4 3-blade would be useable also, but the bigger props
are happier at the lower RPMs than the 6 inch ones.
Mike A