Following on from this thread:
http://www.singletrackworld.com/forum/topic/qu-for-the-electronerds
I got my hands on a pair of thermocouples for a couple of quid each. Two PCU heatsinks for £10 and a couple of 1.5v motors for £3 each. Two rotor blades for £3.
So all in it’s cost £15 or so.
And it works!
[video]http://www.youtube.com/watch?v=zsE4YtzXZe8[/video]
At least, the blade goes round, seems to be enough to keep sufficient heat differential across the thermocouple but it doesnt really feel like its moving much air around so I’ll have a go at fabricating my own impeller sometime.
This is the second version, the first using the metal brackets and one heatsink just wouldnt transfer enough heat to the termocouple.
The second attempt was much better.