Stealth VAWT Upgrades.
Over the last couple years, many people who had watched my ‘Building the Stealth VAWT’ video asked me a question, “How much”? Well, that answer depends on whether you need parts or the whole thing. Unfortunately I haven’t had an accurate answer until now. The first Stealth VAWT was made strictly as a proof of concept experiment. The next two were made as an exact matched pair in order to compare the performance of a WindBlue low wind PMA to a 48 volt Freedom PMA. I used less expensive rivets and bolts than I would have if I was building the things for someone else. Stainless steel fasteners are always preferred over aluminum rivets or plated nuts and bolts. There are also weak spots where I expected eventual failure. I had a good idea of what I needed to do to strengthen those places but chose not to worry about them for various reasons.
Of course now that someone has taken the plunge and ordered, I’ve purchased those higher quality fasteners and made those necessary upgrades on my first customer purchased Stealth VAWT. After all, I want anyone who buys my products to have worried free use of my products for many years to come. To borrow a term from Ron Popeil, “just set it and forget it”.
Better fasteners are only one aspect of the Stealth VAWT upgrades. In my original design, only a small tab of aluminum is holding the blade to the blade mounting ring. Even though I have never seen a blade break free from any of my three prototype VAWTs, this is a known weak spot and needed to be addressed before building a turbine to be purchased. So what is the upgrade? Now each blade has an eight inch long, 1/8″ inch thick x ½” inch wide aluminum reinforcement added to those tabs. They are drilled on one end to accommodate the two 10 x 32 stainless steal bolts that hold the blade to the mounting ring. The opposite end has a 1/4″ inch hole for the 1/4″ 20 stainless steel bolt that holds the tension wire coupling nut. These new structural pieces are a bit like adding a skeleton to a flower. It may not be necessary, but after a strong storm I’d expect to see the petals still in place.
The third improvement not only adds strength to the blade, but (in my eye) makes it just a bit more aesthetically pleasing. I have added one more bend to the vertical blades. This ¼ inch wide outward bend on the outer edge of the vertical blades should help keep those long edges straight through most of the thunderstorms nature might throw at it.
Prices will change eventually, but if you watch this video and are still interested please use the contact form on this website to workout the details.
Parts and Prices
It’s always nice to have access to replacement parts if something breaks, but what if you only need a few parts to begin with? What if you have a PMA or PMG or some other type of generator that you would like to use with the Stealth VAWT? Well that’s not a problem. You can either send me your generator so that I can make a custom 2″inch diameter shaft to mount to the input shaft of your generator. Or maybe you can make a 2″ inch OD shaft for your generator, or have one made locally. The 2″inch locking collars connected to the blade mounting rings should slide over your custom made center shaft. You just tighten the set screw against the shaft and it’s ready to spin. You just saved $175.00 because you didn’t need the center tube I make. But please keep in mind, there is no warranty against falling if I’m not the one who assembles everything from the generator mounting bracket to the tips of the blades.
One – Top of pole mounting bracket for a Freedom or Freedom II PMA
Four – 1″ OD 7/16″ ID X 1 1/2″ inch long aluminum spacers at $3.00 each.
One – Aluminum center tube with stainless steel nut installed.
Two – Twelve blade mounting ring with 2″ inch locking caller at $25.00
One – Primer coated Stealth VAWT blade.
One fully assembled and primer coated Stealth VAWT turbine.
One fully assembled, primer coated Stealth turbine without the center tube.
Recommended by me, but not available through me
48/96 volt Freedom II