Urgent Evoke

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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 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.


Setting the fan up!


Time to sit back and Relax


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

Comment by Andrew Jensen on March 21, 2010 at 6:37pm
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.
Comment by Shakwei Mbindyo on March 21, 2010 at 6:45pm
+1 Creativity. How ingeneous!
Comment by Kevin Carolan on March 21, 2010 at 6:55pm
Well done!
Comment by Wintermute on March 21, 2010 at 6:57pm
!! 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.
Comment by Amos Meeks on March 21, 2010 at 7:10pm
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!
Comment by Wintermute on March 21, 2010 at 7:15pm
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.
Comment by Guy Gore on March 22, 2010 at 5:03am
Very cool WM. Tell Case and Molly I said Hello...
Comment by Guy Gore on March 22, 2010 at 5:04am

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