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Bubble Blowing

Hi all,

Inspired a bit by the candy plane, as a kid-friendly payload, how about a scratch build 'machine' for blowing bubbles from r/c? At a stretch, it could maybe be helpful to visualise turbulence and wind patterns at different heights and around structures?

I've seen a couple of mass produced quads and helo's with bubbles as a USP, but what about a scratch build on a fixed wing or helo?

Cheaper the better,
Simpler the better,
Least likely to fry your electronics, the better...

Maybe some holes in a sheet of acetate? Prop wash windmilling it and blowing the bubbles.. tricky bit's gonna be getting the bubble solution on there without dumping it over something sensitive in a manoeuvre..