"Stephen!" wrote

Isn't bleed air created by an operating engine?

Yes, but not many people have turbine engines, anyway. I was thinking
something like a pair of good ole Detroit iron tuned electric horns, or
perhaps some of those battery powered air horns would work well, too.

I was just saying that the one that scared me at OSH was powered by bleed
air. They probably only were used on that plane because there was ample air
supply at hand to power huge horns, as a joke. I think I read somewhere
that they later removed the horn. Too bad, I think.
--
Jim in NC