[Milsurplus] Aircraft electrical system question

[antqradio at sbcglobal.net]

Was one of the 24 volt aircraft battery terminals grounded to the frame as in cars?  Same question applies to the 115 volt, 400 cycle three phase distribution system, was one leg grounded through a center tap on one stator winding?
I am setting up a 24 power supply using 12 volt router power supplies.  They are pretty cheap on eBay, going for $10 or less for 400 to 1800 watt examples and that is including shipping.  In the particular supplies I have, the negative 12 volt terminal is grounded to the 60 cycle AC plug ground terminal.  I have already removed the ground on one power supply so that it an be stacked to get 24 volts and wonder if I should do the same to the other so that the 24 volt supply is floating with respect to 60 cycle power ground.  Thoughts?Jim
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