"I love that you've brought this to attention. An extensive database of uncommon but resistant and hardy plants/foods could be developed and organized by climate. Ease of growth and processing should also be taken in to account. I will try to…"
A crash course in changing the world.
Charge my laptop 2
OK so take two. I took a lot of your suggestions and took another stab at getting the turbine to work better.
I rebuilt the earlier model so that I could attach it to a proper tripod.
I rebuilt the earlier model so that I could attach it to a proper tripod.
I would have liked to enhance the gear ratio but I was already using the largest and smallest Lego gears that I had. I could have added more gears to increase the ratio but that adds friction. Friction = Waste.
I added 10ft of cable, which will add resistance, but now I won't have to be out on my roof to check the readings.
Although I didn't have the camera ready I recorded a high of 2.2 volts.
I found a way to calculate the maximum energy that it is possible to generate using wind. According to Betz Limit, wind energy efficiency maxes out at ~59% which is pretty good. I think that its time for me to sit down and calculate how much energy I need to charge my laptop. Then build a turbine that generates that much. Then I get to go to a junk yard!
Oh yeah! the other fan didn't end up working. The blades were too small and they couldn't be turned by the wind. I was able to make it always turn towards the wind by having it pivot around the center of balance. If I get my real homework done I will try and do the calculations this weekend.
Views: 28
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Comment by Andrew Jensen on March 21, 2010 at 6:37pm
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Excellent! I applaud your actually constructing your idea and doing tests, I want to see more! I've got a motor and fan I tore out of a busted industrial air conditioner, and I've been meaning to try something like this myself.
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Comment by Shakwei Mbindyo on March 21, 2010 at 6:45pm
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+1 Creativity. How ingeneous!
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Comment by Kevin Carolan on March 21, 2010 at 6:55pm
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Well done!
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Comment by Wintermute on March 21, 2010 at 6:57pm
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!! that's got to be a sweet motor. Ive been tearing motors out of everything I own, looking for the best ones. I think I am going to visit a scrap yard soon.
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Comment by Amos Meeks on March 21, 2010 at 7:10pm
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You're such a pro! 2.2 volts! Way more than your 1 volt goal! I love how you are logging it with videos.
I can't wait to see this charge your laptop!
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AHaha, me a pro. I think the plan is to trickle feed a car battery and then use an inverter to allow 110 output for my laptop. Ideally the turbine would earn twice as much as the laptop draws.
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Comment by Guy Gore on March 22, 2010 at 5:03am
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Very cool WM. Tell Case and Molly I said Hello...
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Now check out my latest blog ... http://www.urgentevoke.com/profiles/blogs/renewable-energy-drink
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