A new electric motor from H3X is claimed to be 3x lighter than other motors with comparable power ratings:
cleantechnica.com

Groundbreaking H3X Motor Brings Electric Aircraft One Step Closer To Reality
The startup H3X says it has developed a compact electric motor that develops more than 3 times the power and weighs less than most commercially available motors. To be specific, the company claims its HPDM 250 motor has an output of 13 kW per kg.
