You may not need a gearbox if you know how to design axial flux motors. Look at the RR racer aircraft with axial flux motors.
When the batteries are made, and the motors are mass produced my grand children will get one each - or something similar. But maybe by then we will be talking mass teleportation through wormholes.
"The 7.3 m (24 ft) span aircraft is powered by three axial flux motors[7] with a high power density driving a single three-blade propeller spinning at 2,400 RPM, designed and manufactured by YASA.[3] The 750 volt, 216 kWh battery has 6,480 cells, with cork insulation and active cooling. Battery output power will be 500 hp (373 kW) continuous, reaching 750 kW (1,010 hp) at maximum power..[8] It is designed to have the highest energy density for an aircraft, and should allow a 170 nmi (310 km) range." Wikipedia.
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