[baybal2]

A trick question. How heavy is your gearbox, and not a motor?

Getting ridiculous power to weight ratios on electric power is not that hard if you opt for super high RPMs.

By my standards, what matters in electric motors are their torque per weight.

[reasonabl_human]

It’s integrated in the motor as specified in the post

[baybal2]

What are gearbox servicing requirements?

[emaciolek]

Initial gearbox design life is ~40k hours. Bearing life is expected to be upwards of 10k hours. Additionally bearings are designed to be easily replaced. Oil change interval is to be determined during endurance testing.