250kW in a 15kg Package – H3X HPDM-250

For long-distance electric aircraft to be feasible, substantial improvements need to be made to electric propulsion system technology," says the company." Today, best-in-class motors and inverters have a combined power density of 3-4 kW/kg. ARPA-E has determined that for a Boeing 737 to complete a typical five hour flight, the propulsion system must be >12 [...]