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extending flight time for quads

I had a weird idea of attaching a helium balloon to a quad to keep it in the air for a super long time.
Anyone else thought of this too? Seems do-able. A helium balloon with just enough gas in it to
help your quad, or plane I suppose, stay in the air for much longer than by just from battery power.
Of course a helium balloon could make your model just float to the heavens if it were big enough
but I`m thinking, just enough to make your flier nearly weightless thus could fly around till you just get tired of flying.
I`m sure there are many possible designs that could be created to do this sort of thing. Whata yall think.
Worth a go or, meh, just buy a bigger battery... :)