4 ms·Unless you're prepared to go supersonic. Not easy to do with electric propulsion though.by mhandley 2y agoUnless you're prepared to go supersonic. Not easy to do with electric propulsion though.namibj 2y agoScimitar props are pretty tame, though, or what part do you mean is hard?russdill 2y agoPretty sure for electric aircraft to do anything useful at supersonic speeds you'd need beamed energy. Which would be a pretty cool technology