Rolls-Royce Accel Electric aircraft

[jcf]

https://aviationweek.com/business-aviation/rolls-royce-unveils-all-electric-accel-aircraft

Modified Nemesis NXT Big Frog.

[NARSES2]

Cheers Jon 

[zenrat]

The article states the Li Ion batteries will supply 750Kw to three motors which will deliver 500hp to the prop.
Apart from the irritating mixture of units (but at least they used real units rather than a comparison like "enough energy to fuel 250 homes" - oh hang on) that's a 50% power loss between batteries and prop.  Is that usual?  It seems a lot to me (but then i'm only a mechanical engineer by education - not a sparky).

[perttime]

The motor is supposed to be 95% efficient, at its best, and down to about 85%, at highest rpm. https://www.yasa.com/yasa-750/
I'm pretty sure they are using some power to ensure the electronics and batteries stay at safe temps.

It could be that the 750Kw is what the batteries and electronics are capable of delivering without overheating? ? ? ?

There might also be some sort of gearing between the motors and the prop. There would be some slight losses there.