thanks, jpMountainMan, Julian California http://www.real-home-based-business-opportunity.com My ultimate hobby project is to build a ten foot tall robot.
thread with pics: http://www.fieldlines.com/story/2005/9/7/155628/5777
and my diary: http://www.fieldlines.com/user/kitno455/diary
allan[ Parent ]
A cute girl at the store helped me open a whole mess of boxes looking for one like this that had bolt holes on both "ends" of the bearings. Since my application is Vertical, I don't think I need to worry about any of it walking anywhere (fingers crossed).
Do you happen to know what type of a car it is from? We weren't able to cross reference it back to a car from the aftermarket numbers on the box.
thanks, jpMountainMan, Julian California http://www.real-home-based-business-opportunity.com My ultimate hobby project is to build a ten foot tall robot.[ Parent ]
You might build a couple of prototypes of the wind machines first. You might make a 'Lenz2' turbine prototype and a 'Picoturbine' prototype.
I think that you will get a reasonable amount of power from those machines.
In principle the efficiency of Savonius turbines is about 30% - 35% if you'll use a correct shape. Ed's Lenz2 might be even better.
We started to make a prototype of 'Picoturbine 250' some time ago, but the project has not been finished yet.
I've myself planning for a bit different VAWT, but a working prototype hasn't been made, I've only made of a plastic tube a model to check out, how easy it is to make the correct shape.
In Europe car wheel hubs are cheap as second hand. Also new bearing sets are cheap, for example for Mercedes only 15 euro. So I think that that a car wheel hub is a good way to make the bearing.
- Hannu[ Parent ]
'Picoturbine' you built sounds too bad. Maybe the match of the generator with the turbine wasn't very good?
But you Lenz turbine sounds really good.
It seems to to have a big future.
I hope that you will soon build even bigger examples of that.
The date and time is set for the Pro wind tunnel testing... Monday of next week at 10:30 am. I'm looking forward to playing with the Pro's and finding out the actual wing efficiency of the turbine. I have several idea's for improvements that I've been working towards but I want to know the actual output of the original with the exception of the minor improvements already in place.
.Have Fun! Windstuff Ed[ Parent ]
http://windausenergy.com/
http://www.wind-sail.com/
http://www.windside.com/
http://www.windwandler.de/eng/index.html
Bil Decker - http://www.aerotecture.com/ Article: http://www.consciouschoice.com/2005/cc1808/windmain1808.html
Enjoyed the Thread![ Parent ]
http://www.absak.com/catalog/product_info.php/cPath/32_93_94/products_id/748
http://www.absak.com/pdf/DOLPHINspec.pdf[ Parent ]
If you use an auto-derived hub that has a splined hole thru it for the outer CV, you simply MUST put something similar in the hole, with big washers on both ends. these joints are a simple press-fit (though admittedly a tight one), and will come apart under load. VAWT application is likely worse than hawt, due to the mechanical advantage they have over the bearing.
i used chevy s-10 4x4 front hubs in my experimental mill. it was only up on a short pole for a few days, however, so i cant give long term test results. I have used the same hub on cars for quite a few years, and have had no major problems. the 1990 and up full-size GM 4x4's use IFS, and are usually 6-bolt wheel flange. if i ever build a larger prop, that is what i would use.
Looking at the hub shown in this post: hub like the one I bought
If I were to use the bolt holes on one end of the assembly to bolt the thing down to a base of some sort, and use the bolt holes on the other end of the assembly to bolt on some sort of a bottom plate for the VAWT/alternator rotor, then all of the weight of the VAWT would be pushing down on the hub assembly, ostensibly holding it together.
In such a use, you would still expect it to come apart?
remember, any mill makes power by slowing the wind, the bigger the mill, the more force it has to withstand. these bearings are quite strong, but they require this bolt in tension to hold them together against the kind of forces you will see with anything over a couple feet square. do NOT rely on the press-fit alone.
