leviatan:
It took me a little while to find what I think might be helpful of your question back in your first few posts asking of previous builds.
A long time member (GoVertical) posted a very well detailed account of his build. It should be of interest to you.
https://www.fieldlines.com/index.php/topic,143852.0.html
I personally am interested in pics of your magnet layout and how they get on with the Aluminum "E".
Cheers
Bruce S
thanks for the aport bruce. i will give a close look to the problems of construction of this other guy.
About the E probably i will do some of theys with plywood to let understnd the concept on images, because the companys in china are since 20 days in new year holidays and all my advances are stoped until theys will back to the work again. When some things dont depends only in my self is very much complicated the whole subject to advance.
Other complication related to chinese companys, are they have splited his industrys in different regions of the country.
The heavy industry where to got the steel tubes is on the north, the place to machine the parts are most commoun and i can got companys in shenzhen ( the south of china) for the magnets i can got in both extremes, north and south, for the aluminum i can got easily commoun profiels in the south, but i not have clear the production companys also are in the south for that item ( custom profiles), to produce the profiles at request.
Some times and depending of the honesty of the sellers, the shipping cost from the north to the south can cost the half of the goods value if are heavy weight goods. Then all is a continuous willing to got the real price for the goods and for a accurate shipping cost.
But i am on the way, i already spent usd 3000 in some parts, then now not exist comeback
.
About the mass of the turbine spining at high rpms, will be contained weight, around only 120-130 kg, and at higher diammeter the rpms are slowers, a lot. Do you can see videos of any kind of commercial and no commercial savonius, and when theys got a diammeter equal or upper than 1.50 meters the rpms are barely a worry.
Answering to bigrockcandymountain: About the quality of the bearings, yes exist huges diferences in costs for the same kind of bearings, but also the rpms at that lower range (and having in account the bearings are measured his lasting life in millions of spins) cant got a premature wear of that parts like could happen in a normal motor when the millions of spins can be obtained in a year of useage.
All confusions about weackness of the rotor are taking like base the videos of litlle prototypes where the RPM are very much highers. Take a look to the luvside turbines videos and you will take a idea of the rpm of a big savonius when you increase the size to semething useable.
Any way that subject of a brake disc of commoun motorbikes could be a solution for that subject in a extreme wind, but is a "simple" subject to solve by that not were mentioned earlier, because not is complicated to add that system to the turbine. Here the most complicated and expensive is to produce a axial PMG that works at deliver some current at that lowers rpms without a gearbox.
That is the big question where i am doing my first aproachs, to solve the issues related at one PMG with that features.
I have 100% confidence in the design of the turbine ( in fact is simply). I cant to say the same about the PMG, i dont know if the size of the coils, and quantitys of stators discs will be enough, or a excess.... today i will do the second coil, i do yesterday one of 15mm tick with 0.7mm wire and took 663 rounds of wire, and was exesive in all aspects (inclusive using 1.2mm wire tick, would continue having a extreme quantity of rounds) .
Today i will do one of only 10mm height to simulate the current in a stator with two layers of coils of 5mm each one. Some things until you dont have on hands and do some tests cant calculate if are enough or a excess.