2 ms·
Considering the thermal efficiency of a modern jet engine, the usable energy compared to a lithium battery will be ~15 higher per kg, still bad, but not as bad.
by GaggiX 2y ago
Considering the thermal efficiency of a modern jet engine, the usable energy compared to a lithium battery will be ~15 higher per kg, still bad, but not as bad.
- timschmidt 2y agoAlso some napkin math using common examples gives a range of 0.2 - 1.2 horsepower / kg for gasonline motors, and 8 - 21 horsepower / kg for electric. So even though the batteries weigh more, the motors weigh less.
- numpad0 2y agoDoesn't it compound since it costs fuel to carry fuel in a flying machine? I'm not sure about math but isn't it like 1/15th Isp, even with that maximally optimistic value?