Build a vertical axis windmill from cardboard and recycled pop bottles to experiment with wind power generation.

Small wind turbines have lower energy output than commercial wind turbines, such as those found in wind farms. Commercial generators in the 5-50W range are available for boat or caravan use.

While this particular model is made from a 24 oz. water bottle larger models with blades cut from a 2 or 3 liter soda bottle and using a cardboard, plywood or sheet metal end pieces should be efficient enough to drive a generator based on a fan motor such as those found in old CPU cooling units.

A 12V .09A CPU cooling fan connected to this assembly could produce as much as 1W under the right wind conditions. This is more than sufficient to recharge NiCad batteries and other trivial energy needs, or fed into an existing inverter as a supplemental power source.

With some scaling and good gearing it should be possible to reach as much as 25W using this basic design.

I would like to thank rhackenb for his most excellent and inspirational 'ible Cardboard Savonius Wind Turbine

With that in mind lets get started....

Step 1: Bill of Materials

At this stage the list is pretty simple and mostly means some tools more than particular supplies.

A protractor - That thing for drawing circles
A compass - The half circle that comes in the package with the thing for drawing circles
A ruler

A soda bottle. Almost any size will do and the directions will scale up or down as available. I used a 24 oz. water bottle.

Something to use for an axle. I didn't get fancy I used a wooden skewer from a pack of 100 we had in the drawer. Future designs which are used to power generators will probably have a two part axle ( top and bottom ) and not carry the extra weight in the center.

A couple of paper plates or other cardboard for use as the end pieces
To get your labels off fill the bottle with very hot water. I heat enough water (not to a boil) on the stove to fill two bottles. Wearing oven mitts, and using a funnel I fill the bottles in the sink. If the water is hot enough, it will almost instantly melt the label adhesive. referenced from (http://www.flickr.com/photos/greenscaper/2519983658/in/set-72157604735985648)<br><br>I also found a cool hot knife instructable to save us from laboriously cutting soda bottles with scissors. http://www.instructables.com/id/A-Hot-Knife-cuts-plastic-rope-opens-welded-pla/<br><br>I can't wait to try this out!!! Love it!
Excellent, I have featured your comment.
I used cd's water line 3/4 plastic superglue and pan washers that model is bigger but try aluminum for the rounds and pvc for the vanes. Or possible rout a grove in some polystyrene and use adhesives to cunstruct drill to balance and paint to get it uniform. think charge 6 volt conventional batteries.RAPID PROTOTYPE LOVES SAVANIOUS WIND TURBINES
I love this!!!&nbsp;&nbsp; :D
I think you have "protractor" and "compass" mixed up. The protractor is the semi circle marked out in degrees, while the compass is the tool for drawing circles.
My God you're right. I didn't even really think about it.
forgot to add: Good 'ible, looks like a great platform for assessing torque and sustained watt values for larger scale VAWT, and cheap to make. Thanks!
Would this work in reverse as a fan, with an enclosure like a squirrel cage (centrifugal) fan ?
Absolutely. However it will be less efficient than a traditional type fan since it isn't as focused. Adding a squirrel cage would overcome this I think.

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