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Tim L
New Member
United Kingdom
70 Posts |
Posted - 27/05/2008 : 11:41:48
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Hi gholt
Thanks for the interest and the compliment!
The blades are very substantial and as Ghurd pointed out the difference is only about 1% so it might not matter too much, but I'm a bit of a worrier with big weights and high RPM, especially in my current urban setting.
The motor is one of the few that Renewable Components were selling off cheap (I got mine for £47), the ones that are said to cog badly, and yes it does cog a bit - but not enough to stop my very first attempt with wooden blades from packing a big punch, OK it took a gale to do it but it utterly overwhelmed my 2 little parallel 12V car batteries and 300W of divert load and poked to 30V and nearly 30A at one point.
It was a bit of a concern - the batteries were getting warm and going "blup....blup...blup". I hadn't expected that, the batts are only there to clamp the voltage, everything extra once they were charged was supposed to be eaten by the test divert load (of a couple of cheap 3KW electric radiators in parallel). It's now set for 24V so the divert load should have twice the capacity, and I've also now got a 24V 1KW inverter wired up and ready to go if the low voltage dumps can't eat all the power.
It's all a temporary setup, when I move I'll either make the divert from a couple of 600W 24V immersion heater elements in the hot water tank, or modify my 1KW inverter to soft-start and run a standard domestic immersion heater off it.
I'd like to think that the cogging effect will mean I don't wear out the bearings (Gordon at Renewable Components said though that the bearings were standard and easily replaced if necessary) by idly spinning in faint winds that wouldn't get it up to charging speed anyway, and that when a good wind comes along they'll start spinning like they did before.
The blades are supposed to be able to deliver well over a kilowatt - hitting 1KW at 18mph and peaking at 1.8KW, though what with the motor cogging and my low tower in dirty air I'm not too worried about that, especially as the TSR drops from 10 unloaded to 6 under heavy load; if all goes well, after I've moved and when this motor wears out I'll go for one of Gordon's 2.2KW units - both the axle and prop mountings look exactly the same as my motor so with any luck it would be a straight swap-out.
Note: A YouTube Video Is Not Necessarily Proof Of Anything At All
www.youtube.com/watch?v=UpNp4l0qyY0 |
Edited by - Tim L on 27/05/2008 12:11:40 |
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cms magnetics prop
