Site Logo

 
It is currently Sun Nov 23, 2014 4:51 am

All times are UTC - 6 hours




Post new topic Reply to topic  [ 15 posts ]  Go to page Previous  1, 2
Author Message
 Post subject: Re: Looking for an Electrical Expert - Summer Experiment
PostPosted: Sun Jul 25, 2010 12:57 am 
Offline
User avatar

Joined: Sun Jun 20, 2010 4:50 pm
Posts: 4
Location: Saint Paul, MN
UprightEgg wrote:
... We're mostly interested in this bike idea, and really the theme of energy powered by kinetic energy from Humans - so, hand cranks, bikes, etc. are the main focus. ...

In case its of use, note that Green Power Science has some videos on this subject and also offers a geared DC generator which might be useful.

See: http://www.greenpowerscience.com/BIKEGENERATOR.php .

Image

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
As far as hand crank electric generators, most of the ones sold to the public break in a matter of days or weeks. A notable exception is the Motorola Freecharge generator. It was designed for charging cell phones, but is extremely durable. I attached alligator clips to several and provided them to Science Museum visitors to learn about electricity. They've been running for several years without problem!

Here is a source: http://bellsouthpwp.net/p/a/pagerboy/

and a photo:

Image


Top
 Profile  
 
 Post subject: Re: Looking for an Electrical Expert - Summer Experiment
PostPosted: Tue Aug 10, 2010 2:07 pm 
Offline
User avatar

Joined: Tue Apr 06, 2010 10:12 pm
Posts: 750
How's this project going?
Need help?

Pete


Top
 Profile  
 
 Post subject: Re: Looking for an Electrical Expert - Summer Experiment
PostPosted: Fri Oct 22, 2010 11:36 am 
Offline
Site Admin
User avatar

Joined: Sat Mar 14, 2009 4:14 pm
Posts: 1444
Location: Minneapolis, Minnesota
One more query: What's been the outcome of this project? Anyone know?

_________________
612-293-MAKE World Community Grid Team Page | Blog | Promo Flyers | Dues Info
Active Topics | Twitter Page | TCM Photos | View Your Posts | YIM waynoid | AIM wammie777


Top
 Profile  
 
 Post subject: Re: Looking for an Electrical Expert - Summer Experiment
PostPosted: Mon Oct 25, 2010 10:02 am 
Offline

Joined: Tue Jan 13, 2009 8:26 am
Posts: 378
I delivered and set up the bike generator for them the night before they opened.

It turned out- unsurprisingly- that the amount of work required to power their lights was vastly more than could be reasonably expected of a person of normal fitness. Rough guess was a 6-8:1 ratio of pedaling time to use time, and that was NOT easy pedaling. Think riding a BMX-type one-speed bike up a steep hill and you're about right on the amount of effort.

In the end, though, I'd call it successful- that fact alone did a great deal to call attention to the degree to which we take energy for granted, and that was the goal of the project.

I haven't heard back from them since then, however.

_________________
Mike H.
My maker blog


Top
 Profile  
 
 Post subject: Re: Looking for an Electrical Expert - Summer Experiment
PostPosted: Tue Apr 19, 2011 8:10 am 
Offline

Joined: Thu Jul 01, 2010 1:48 pm
Posts: 6
Hello TCMakers -we should have followed up here after the show opened! Mike is right, the project was a success in our eyes, too - the audience had opportunities to pedal the bike and we spoke with interested folks before and after the show about how the system was put together and how much work goes into generating electricity.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 15 posts ]  Go to page Previous  1, 2

All times are UTC - 6 hours


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Template made by DEVPPL Flash Games