Full WEP, 100%, flaps up or down, doesn’t matter. Stock Ki-43-II won’t fly. Averages out at 4km/h on the runway.
Brakes on some how from a weird keybind?
After some finagling it turns out that it only flies if I slowly apply engine thrust. So I have to start with 30ish throttle % and then wait till the speed starts to actually increase before I can increase my throttle any further.