Urgent Evoke

A crash course in changing the world.

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


You need to be a member of Urgent Evoke to add comments!

Join Urgent Evoke

Latest Activity

N updated their profile
Sep 25, 2020
Sophie C. commented on Asger Jon Vistisen's blog post Stinging Nettle
"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…"
Aug 19, 2020
Meghan Mulvey posted a blog post

Fourth of July on the Lake

This past weekend was the annual celebration at the lake house in Connecticut. It is amazing that the lake is still so clear and beautiful after all these years. The watershed association has done a wonderful job protecting these waters from the damaging effects of development.The wood grill was finally ready to cook on, so we didn't miss the propane tank fueled grill anymore. The food actually tasted fresher than in the past and was easy to keep fueled.Dad was very proud of the solar hybrid…See More
Jul 6, 2020
Asger Jon Vistisen posted a blog post

Stinging Nettle

In this blog post I will focus on a plant that is abundant in our nature, and which is immensely nutritious. It's of course the Stinging Nettle. Let's start with the chemical constituents of this plant:37 % Non-Nitrogen-Extracts19 - 29 % Ash9 - 21 % Fiber4 % Fat22 % ProteinOnce the leaves are drid, their protein content can reach an astounding 40 %, which is much higher than beef, which even under the best of circ**stances can never exceed 31 % protein. In addition the Stinging Nettle consists…See More
Apr 13, 2020
Jonathon McCallum posted a blog post

The meal

It is 7'oclock, I was late home from work due to an assignment that i wanted to get ahead on. By the time I get home I am feeling extremley tired and I cannot be bothered to make a proper meal. I walk to the fridge and open it to see what there is for me to eat. All of the out of date foodstuffs have been automaticaly thrown away by the fridge, they will be recycled tomorrow as animal feed or something. I see i have organic local eggs and some local cheese. Foods are vacc** sealded for easy…See More
Mar 10, 2020
Jean Paul Galea shared a profile on Facebook
Mar 1, 2020
Kevin posted a blog post


FutureToday is 2020/1/1. It is just like yesterday. The war is still continuing. It has started since 2010. In 2010, that year was a horrible year. Almost every energy ran out. Every country’s governments were crushed down at the same time. There were riots everywhere. All of the big company’s bosses were killed xdeadx in the riots. Troops fought each other everywhere. Food was bought up xawayx at once. There were no more food supplies in any shops. The economy was all crushed down. All the…See More
Jan 1, 2020
Namwaka Mooto posted blog posts
Jan 13, 2016
T D updated their profile
Sep 3, 2015
Brook Warner posted blog posts
Aug 25, 2015
Santiago Vega posted blog posts
May 5, 2015
Santiago Vega commented on Santiago Vega's blog post Act 8
May 5, 2015
Santiago Vega posted photos
May 5, 2015
Rico Angel Rodriguez posted blog posts
May 2, 2015
Rico Angel Rodriguez posted a photo

public servants

The exchange works directly for state and public workers and servants. It gives them credit in exchange for the amount of public work they contribute to the community. The more constructive they are based off a base rate the more credit they recieve.
May 2, 2015
Brian Hurley posted blog posts
May 2, 2015

Follow EVOKE on Twitter

Official EVOKE Facebook Page

EVOKE RSS Activity Feed

© 2022   Created by Alchemy.   Powered by

Badges  |  Report an Issue  |  Terms of Service