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400 hz was used in aircraft because transformers took less steel in their cores and therefore were lighter. The same held true of synchros, servos, and motors in general. The flyboys didn't care about how much power things drew since they had all then needed as opposed to the sailors who...

There are a couple of ways to make 60 cycle power from 400 cycle sources but they're expensive and not very practical. Early methods were with "rotary converters" which are all that dynamotors really are. The electronic converters come in 2 flavors, modified sine wave and pure sine wave...