Homebrew Wind Power by Dan Bartmann and Dan Fink.The best book out there about building and flying do-it-yourself wind turbines. We know, because we wrote it! Order it from our Online Store HERE.

Axial Flux Wind Turbine Plans by Hugh Piggott.The newest version (August 2008) of Hugh's classic wind turbine plans set. Order it from our Online Store HERE.

In most locations, GENTLE winds (5-15 mph) are the most common, and strong winds are much more rare. As you'll see by examining our latest machines, our philosophy about designing wind turbines is to make large, sturdy machines that produce good power in low wind speeds, and are able to survive high wind events while still producing maximum power. The power available in the wind goes up by a factor of 8 as the windspeed doubles.
Other critical factors are rotor size and tower height. The power a wind turbine can harvest goes up by at least a factor of 4 as you double the rotor size. And making a tower higher gets you above turbulence for better performance and substially increased power output. Putting a wind turbine on a short tower is like mounting solar panels in the shade!

Before you jump into building your own wind turbine or buying a commercial one, do your homework! There are certain things that work and certain things that don't, and you can save hours and dollars by learning from other people's successes and mistakes. Some recommended reading:

• Our book Homebrew Wind Power covers everything you need to know about the physics behind turning moving air into electricity, and includes detailed, step-by-step illustrated instructions on how to build a 10-foot diameter, 1 kilowatt turbine. And much more, including controls, wiring, towers, and troubleshooting.
• Our article The Bottom Line About Wind Turbines is an essential introduction to wind power. It covers the basics of how wind comes to us, how much power different size wind turbines can make in different wind regimes, and has a very handy section on detecting wind turbine scams.
• Otherpower.com's Wind Turbine User's Manual should also be considered essential reading, especially BEFORE you take the plunge and buy or build a wind turbine. It will fill you in on exactly what you are getting yourself into with wind power, including towers, installation, controllers, and troubleshooting. It can be downloaded for free from that page, and is available in printed form through our Online Store.
• Wind power information from homebrew wind power guru Hugh Piggott's website. We've learned a BUNCH from Hugh.
• Hugh Piggott's book Windpower Workshop is an indispensable reference for anyone that's thinking about building a wind turbine. His Axial Flux Alternator Windmill Plans are very detailed and highly recommended.
• Homebrew wind power infomation from Ed Lenz's Windstuffnow.com, a highly informative website.
• Read the Renewable energy FAQs on the Otherpower discussion board, and Search the Otherpower.com discussion board. It's highly active and populated by windpower experts and hobbyists worldwide. If you still can't find and answer, by all means please join the board and ask your question there!
• DanF's series on Small Wind Turbine Basics, published in the Energy Self Sufficiency Newsletter:
  • Part 1 -- How wind turbines work, power available in the wind, swept area, average wind speed and what it really means. The basic essentials!
  • Part 2 -- High wind survival mechanisms, wind turbine types, drag vs. lift machines, HAWTs vs. VAWTs, tip speed ratio, blade design, and lots of cool pictures and diagrams.
  • Part 3 -- Choosing a site, good and bad site examples, anemometers, tower types, lightning protection, power regulaton, birds and bats.
• Explore other wind power websites from worldwide on our Links page.

• Guemes Island 2004--How to Build a Wind Turbine -- Our pages with details and photos about the excellent seminar we attended--our second time attending. Hosted by Hugh Piggott and put on by Solar Energy International (SEI), these seminars are extremely valuable learning experiences, and loads of fun besides!
• DanF's notes on the 2004 Guemes Seminar -- More pictures, and details of the various design and construction improvements made in 2004, plus some interesting new testing methods.
• Guemes Island 2003 -- How to Build a Wind Turbine -- Hugh Piggott's webpage about the 2003 SEI seminar. Great pictures!
• Rocky Mountain Sustainable Living Fair 2004 -- We put on a seminar, and with the help of our students built a wind turbine in a single weekend.
• Rocky Mountain Sustainable Living Fair 2005 -- A page about the same workshop in 2005. The students built a very nice machine over the course of two days.
• MREA 2006, 6-day workshop --The MREA (midwest renewable energy association.) asked us to give a 6 day workshop at Mick Sagrillos shop in WI... it was lots of fun! We built 3 different sized machines over 6 days... check out DanF's page about it.

• Midwest Renewable Energy Association, Algoma, Wisconsin, USA -- May 19, 2008 to May 24, 2008. We are pleased to once again offer a week-long turbine construction seminar on the scenic Door Peninsula of Wisconsin, at wind power guru Mick Sagrillo's wind turbine machine shop. Registration is currently OPEN for this seminar, click the link for more information.
  
• Rocky Mountain Sustainable Living Fair, Fort Collins, Colorado, USA -- September 20 to 21, 2008. We've been giving these short, 2-day seminars at the Fair for quite a few years now, and they are an excellent and inexpensive introduction to building a wind turbine from scratch. Registration not yet open, detailed info TBA.

• Complete wind turbine kits
• Welded metal frame kits
• Flat metal parts kits (you weld it together)
• Pre-wired and cast stators for 12, 24 and 48v systems
• Carved wind turbine blades
• Magnets
• Magnet wire
• Rectifiers
• Stainless steel hardware
• And more!

• How to build a 10 foot diameter wind turbine. Very detailed plans for building our latest 10 foot wind turbine. Covers all aspects of building the frame, alternator, and blades from scratch.
• Designing and building simple wind turbine blades. A basic introduction to how we do it.
• Wind turbine concepts defined and explained.
• Choosing alternators/generators for wind power.
• Glossary of wind power terms.
• A basic introduction to building wind turbine towers.

Wind Turbine Evolution This page gives a complete history of our wind turbine projects over the last few years. It explains how and why our designs have changed, and why we no longer pursue many of the older ones. A very fun read. You can see what we came up with years ago, back when we had no idea what we were doing!	Our latest 10 foot wind turbine Active Project This turbine is the latest evolution of our dual magnet rotor designs. Most of the parts on this machine are fabricated, we're not using brake rotors or any salvaged parts here. This page is the entry way to several pages which will go over it's construction in detail. It makes for a good 10' diameter, quiet, nice looking wind turbine. This is the machine for which we sell all the parts and kits (above).
Large 17 foot diameter wind turbine project (02/2008) Active Project This new machine is an updated and improved model of our older 17 foot design, below. It's good for an honest 3kw, and peaks of nearly twice that. This page also includes a lot of excellent detail about the large, sturdy tower needed for a turbine this big and powerful.	Large 20 foot diameter wind turbine project. (07/2006) Active Project This is good for nearly twice the power in lower winds as our older 17' machine. We attribute this to more swept area, a higher tower, and a better location. This wind turbine is good for about 5KW in higher wind. The page about it also includes a lot of detail about the tower.
Tim's 10 foot wind turbine Active Project This turbine is among the last of the brake disk machines we made. We have built and flown nearly 20 of these turbines. This page details some of the improvements over older machines. Over 1kW peak output, and starts up in very low winds. These machines have been performing quietly and reliably, with excellent power output.	A small 7' 300 Watt wind turbine Active Project This page is about a cute little 7' machine that uses most of the same parts and is really the 'little sister' to the 10' machine described in detail to the left.
17 foot diameter, 3+ kW, 48V turbine (3/2005) This is an older page, and we've since completely re-designed the turbine. But it's still a good read!	Rocky Mountain Sustainable Living Fair 2004 Wind Turbine This one is a 10-footer just like Tim's wind turbine, and is identical in most respects. However we built it in just one weekend at the 2004 Rocky Mountain Sustainable Living Fair, with the help of students who signed up for our seminar. None of them had ever built a wind turbine before, so this page also shows easy it can be!
5-10-2004 -- The Wind Farm -- some 10-foot diameter homebrew wind turbines. Our whole community is off-grid, and we've been assisting neighbors in the design and construction of our brake disc axial turbines. Somehow the project became the 'Wind Farm' and there are now turbines flying in the area sporting a whale, a rooster, and a pig for tail vanes. We get valuable testing information out of the deal, and our neighbors get power. This is an older page, we don't build turbines this way any more.	05/10/2004 -- Building and testing some BIG wind turbines. This one has a 14-foot dia. rotor. 2 More similar to it are under construction.Larger rotors mean a turbine can capture power out of lower wind speeds. This one starts making power at 6 mph, hits 200 watts at 10 mph, and makes over 1000 watts at 22 mph, when it starts furling to protect itself. This is an older page, we don't build turbines this way any more.
Homebrew dynomometer testing rig for wind turbine alternator Active Project We've tested alternators before by spinning them in the lathe, but it wasn't powerful enough to get much power out. Out at Hugh Piggott's 2004 Wind Turbine seminar, we all tested Hugh's new 12-foot design by spinning it with an engine. Details are here for how we did it with two of our alternator designs, and the data we got. The scale is in there so we could derive foot-pounds of torque and calculate efficiency. A great idea from Hugh Piggott!	10/10/2003 -- The Triplets -- 3 new 10-foot diameter dual-rotor brake disc wind turbines! These 3 nearly identical machines are built with the same design as the mill at the Caboose (5/20/03, below) but we streamlined the construction process significantly and built 3 machines at the same time -- Curly, Moe and Larry. These are the latest of our designs, and they perform great in low winds. Detailed DanCAD drawings and dimensions on this page. This is an older page, we don't build turbines this way any more.
5/10/2003 -- New Brake Disc Mill 9-foot dia prop, furling tail, 3-phase, separate laminate assembly with excellent specs. Many improvements over our previous designs! Spins up and makes power freely in low winds, and governs itself in high winds. Very old page...we don't build them this way anymore.	5/20/2003 -- Dual Rotor Brake Disc Mill Up and flying at the Caboose. Excellent low wind performance with 10 foot prop, great furling system. Very old page...we don't build them this way anymore.
The Wood 103 A 100-watt windmill built entirely from wood! More of a demonstration than anything, but a quick weekend project that will teach you about windmill construction.	The Wood A-X A quick-and-easy 200 watt windmill, built mostly from wood! Very old page...we don't build them this way anymore.
DanF's Wood A-X DanF's version of the Wood A-X is very similar to the original, but with slightly sturdier contruction. Very old page...we don't build them this way anymore.	Ward's Prop Gallery Ward and his collection of broken props, tails and stators. This is what happens when you let DanB and DanF use you for a wind guinea pig! But Ward's tower has the best height and wind exposure in the area, so it's where we try and make windmills blow up to further our research. And he's a good sport! Very old page...we don't build them this way anymore.
400-watt Volvo Windmill One of our older designs with no furling system. Very old page...we don't build them this way anymore.	400-watt Volvo Windmill Again based on a Volvo brake disc, this one has a 3-bladed prop that is slightly smaller than Ward's mill. It's an ongoing experiment too...a new stator is in the works. One of our older deisgns with no furling system. Very old page...we don't build them this way anymore.
Building Towers for Wind Turbines Details, diagrams and photos of many different ways to construct tilt-up towers -- ranging from the extremely solid and sturdy to the quick and dirty, field-expedient versions!	Designing, Building and Flying a Wind Turbine Just our collection of information on all phases of the process! If you are new at wind power, it might help explain some confusing aspects of this 'black art.'
Induction Motor Conversion Mill Built using an AC induction motor converted to a permanent-magnet alternator. We've since found that from-scratch PMAs are more efficient than conversions.	Small Science Fair Windmill With a small computer fan blade as a rotor, this little mill makes a great science fair project. The frame is made of PVC pipe, and nothing is to big or fast to be very dangerous. It will light a small bulb using a box fan for power.

Click on the image to see a 15-second MPEG video of the Model A wind test experiment

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