The propeller was always the same: metal x432. Most likely a octura copy. It says TFI 432 in it.
I sharpened and polished the propeller after the first set. This didn't change anything, my 3s battery still activated the cutoff.
The calculator
http://www.radiocontrolinfo.com/RCca...Calculator.php
Estimates 63,3 km/h with 3s. I really hope I can test this with the new battery.
- is the max speed too much
- does it generate too much heat