So.... on a previous run-up of my Velox with a Xoar 18X8, I got these numbers, using a Globee tach and a "Watts Up" meter....
on Thunder Power 6S 65C 5000mAH packs and default settings on Castle ICE100 ESC, with a Xoar 18X8 (suggested prop), I got 7320 peak RPM (actually varied a bit as I was trying to hold both the plane and my Glo-Bee tach at the same time, while my wife ran up the throttle). 24.17 volts, 72.2 amps, and 1648.3 watts (Checked with a "Watts up" meter). Both the watts and amps are pretty low, and since the motor is rated for 2500 watts peak, this means a larger prop could definitely be used.
Yesterday, with a Xoar 20X10, the wires on my "Watts Up" meter were getting hot, but I was showing 91.66 amps, at 23.92 volts and 2,080 watts, and again with my Globee tach, I was showing 7020 rpm...
I usually don't use the logging on the Castle ESCs, but after talking to Kyle at Aero-Model I decided to try it. At first, I couldn't get it to work (I was using my old laptop), so, it took me a few tries which is why the voltage is down a bit, but here is what I got with the logging....
Volts=23.3 max, 20.3 minimum
Amps=100.1 max 33.3 average
Watts= 2163 max 722 average
RPM=7079 max 3721 average...
Even with the partially discharged packs, 2163 watts (235.10 watts per pound) should be enough to pull a 9.2 pound Velox around quite smartly!! Especially, since you really can't compare the input wattage of a 28 pole motor to a 14 pole motor....
SteveT