Tested my GS Pro V12RR today with the Russian .09 pipe

APC 6x3 for a closer unloaded est. with a 6.3x4
.6hp / 448w
3.4lbs thrust
28,270 / 80.31mph static.
Estimate 29.6k unloaded APC 6.3x4 / 112 mph -will use for test flights.
6x5 should do around 130 mph - after the plane is trimmed up and flown a few times.
MA 7x5 cut down to 6x5

The engine had no problem instantly spinning the prop up to max rpm the acceleration was clearly
ridiculous and wont test with the 6x3 ever again.