To get good starting torque from a BLDC you need to use one with Hall sensors so you can commutate accurately at low speed - otherwise you only have open-loop drive which is pretty useless if the low involves static friction like an engine.
For driving an air-screw in an RC plane there is no load at low speed (propellers only start to load up at speed), which is why Hall-sensor-less BLDC systems can work fine for that application.