From the rc car world and BL motors, more turns means more torque but less speed. So for big trucks it's good to have a higher turn motor. For speed, I go will a lower turn motor.

I'm trying to find some sort of pattern here. My goal is to get decent speed while maximizing efficiency for the parts I use. I guess I should set some requirements for what I want the plane to do and what motors/batteries/esc/props I have. Then find a combo that meets those goals? "I want my jet to go about 100kmh with a 2S/3S/4S battery and a 30-40A ESC with about 80% drive eff", if I had this as a goal to strive for would that work?

I guess you can have lots of combos that would meet the exact requirement so one guy may have smaller prop and higher rpm motor vs another guy with a bigger prop etc. And they both perform the same. that's what's kinda confusing to me right now. I can't seem to find a pattern.

I noticed DriveCal has a "Match Prop" button does that mean it'll magically figure out what the best motor to use for my prop? I tried that and it found motors that had drive eff as high 90%.