Post WWII the US military had some aircraft & systems that ran 800 Hz (they called it 800 cps back then). Same rationale, just taken a step further. I don't know why it was abandoned.
I used to use a pocket calculator in the jump seat to do engine performance checks. It had a wall wart to recharge the battery, said transformer labelled 120v 50/60 hz. It worked fine and ran cool on aircraft 400 hz. But don't try it the other way around!!!
