To add to what Jason said- The characteristic current of the machine is roughly the same as the maximum inverter current, so at maximum power the power factor

To add to what Jason said- The characteristic current of the machine is roughly the same as the maximum inverter current, so at maximum power the power factor is between 0.7-0.8. This also means the flux weakening capability (CPSR) of the machine is very good, although that isn't particularly useful in these propeller-load applications. In many applications the machine would spend most of the time at ~0.6pu speed and ~0.5pu torque (cruise), where the power factor is > 0.9. I can't discuss the specific rotor design, but I will say it is a very high flux machine.