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After you look at that for a while, you will notice that you can
use a single pole double throw switch, and switch only the powered side and let
aircraft ground do the other side.
I knew there was going
to be a problem with the fan free-wheeling, so I had a SPDT switch wired as you
described. My fan was probably the worst case, since it was 16", and was
on the outside of the radiator, so the prop blast hit it directly. Still
kinda surprised it blew the fuse. I've used aftermarket fans on cars
before, and never had a problem like this. If I didn't have better things
to do, I'd investigate this further.
Cheers,
Rusty (the
untuned)
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