Hi my favourite hobby is fly fast planes. I have some F5D Avionik, and F3D planes also. I am using Avionik with 18 x gp1300 and about 60A. Motor is hacker B40 11L it turns 4,75"x4,75" APC about 38000 rpm.
F3D planes have about 6,7"x8" prop. My hand made IR (Ravil Ibragimov) motor turns that prop about 32000RPM top speed is about 360 km/h