> What I've always wondered about those things is how dependant they are
> on the other side of the HT supply being earthed ... could be a bit of a
> problem if they want to achieve actual flight!

Not at all.  Earthing loses its whole point once you go through a transformer.
Isolation and all that.  Well, not entirely isolate, but quite seriously.

More to the point, I saw a place where a horizontally positioned lifter was
used to drive an airship, which carried then entire powersupply battery and
all underneath.

Mike H.
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