Proving some rotation
On Friday, 19 April 2019 22:06:31 UTC+1, Harry Bloomfield wrote:
The Natural Philosopher explained :
I think that is overblown.
All you need is something like a guitar pickup. Lots of turns round a magnet
close to where the blades are. Should be enough power to light a LED
Well I tried it and although the blown flap was able to operate a
micro-switch quite easily, the flap slowed the exit air flow and
quickly choked it up.
I'm not going to try attaching anything to the blades, I have in mind a
magnet on blade pulley, above the deck. It should be fairly easy to
then make a bracket to mount a coil.
easier would be a strip of polythene. When the blades turn it'll blow & flap busily. You'll notice if it's not behind you.
NT
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