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Clogs
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Posted: 20 December 2006 at 4:07pm | IP Logged Quote Clogs

Hi all, Im a long time reader but first time poster.

Heres one for the vawt guys. I was looking at a piece
of dia 400mm PVC I have for hawt blades and wondered if
I could make a vawt out of it.

Has anyone tried anything like this? The dimensions as shown are dia 400mm x 600mm high x 10mm thick.
Leading & trailing edges would be carved into nice
airfoil shape.



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Highlander
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Posted: 20 December 2006 at 5:27pm | IP Logged Quote Highlander

G'day Clogs, nice graphic, what did you do it on?
That looks a bit like a darrius.
I've go no idea on vawts just wanted to congratulate you on the drawing.
Glenn or the American boys would be the best ones to give advice on that.
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brucedownunder2
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Posted: 20 December 2006 at 7:39pm | IP Logged Quote brucedownunder2

Yes, magic drawing --can you tell a dope like me how you do that --- must be a hell of a lot of learning how to drive that computer programme? I'd love to do some thing like that but I think I'm tied to the hacksaw and welder in this life.
Congratulations

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Gizmo
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Posted: 20 December 2006 at 7:39pm | IP Logged Quote Gizmo

Yeah it would work. I have a couple of suggestions.
First up, I've marked on your picture where you could leave out the outside hoops, marked with a X. The inside struts will hold the wings in place, and it also means you could make a dozen or more wings from the one length of PVC.

Second, shape the wings to a aerofoil shape like this.

Remember the Darrius wont usually self start, they need a kick to get them going. But once going, they are good performers.

Glenn


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vawtman
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Posted: 21 December 2006 at 7:38am | IP Logged Quote vawtman

Clogs wrote:
Hi all, Im a long time reader but first time poster.

Heres one for the vawt guys. I was looking at a piece
of dia 400mm PVC I have for hawt blades and wondered if
I could make a vawt out of it.

Has anyone tried anything like this? The dimensions as shown are dia 400mm x 600mm high x 10mm thick.
Leading & trailing edges would be carved into nice
airfoil shape.
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vawtman
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Posted: 21 December 2006 at 7:40am | IP Logged Quote vawtman

Gizmo wrote:
Yeah it would work. I have a couple of suggestions.
First up, I've marked on your picture where you could leave out the outside hoops, marked with a X. The inside struts will hold the wings in place, and it also means you could make a dozen or more wings from the one length of PVC.

Second, shape the wings to a aerofoil shape like this.

Remember the Darrius wont usually self start, they need a kick to get them going. But once going, they are good performers.

Glenn
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vawtman
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Posted: 21 December 2006 at 8:13am | IP Logged Quote vawtman

Yes Gizmo your drawing is right on has to what he should do with the blades and supports.
A curved airfoil like that will self start easily.It seems has the wind hits the foil from the side and your off and running.Yours will be a little thin but should still work.
I have no problems with starting.No fidgeting back and forth like some has a matter of fact in high winds i block it off just on one side.Doesnt attempt to back up.

Attach the blades to the rotor at the very top and bottom.
Thats sorta how im doing my rooftop darrius only with many fiberglass blades.Still in the early stages yet though.
Go for it.

Am i somehow replying to 2 post

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Clogs
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Posted: 21 December 2006 at 8:52am | IP Logged Quote Clogs

The graphic that I posted is a jpeg taken from the model
that I drew up in Autodesk Inventor. Inventor lets you render images then save them as jpeg's.

It could make a useful little turbine as long as it reliably self starts. I was considering one on the roof
of the shed...im in an urban environment so can't go to big & noisy.

Vawtman, what generator are you connecting to your rooftop darrius?
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Clogs
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Posted: 21 December 2006 at 9:07am | IP Logged Quote Clogs

Do you guys mean something like this?
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vawtman
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Posted: 21 December 2006 at 10:04am | IP Logged Quote vawtman

Clogs wrote:
Do you guys mean something like this?
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vawtman
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Posted: 21 December 2006 at 10:31am | IP Logged Quote vawtman

Yess Clogs
I wish i could draw things like that.If you keep the solidity high like your drawing the turbine wont selfdestruct has the sayings about the darrius.
I wasnt planning twisted blades but that might work awesome for ya.

Alternator im planning is 12pl 36coil Axial flux design.No cogging(needed for starting)
Pics in my files at Otherpower not sure how to bring them here.
Nice thing for my climate is the heat generated would make it almost 100% effecient.
This turbine will have many thin curved blades.Working on the foam cutter now.

Will run silent Carry on
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Bryan1
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Posted: 21 December 2006 at 9:05pm | IP Logged Quote Bryan1

Hiya Clog,
           Eh mate I like the design concept and I've been thinking of a way to use the 12" pvc I have here for a vawt. As I have a heap of this pvc I might have to makeup a prototype and test it out. Naturally if this design works out we'll have to name it the Clog Turbine and the credits will go to you for coming up with the idea.

Well this weekend looks like I'll be making lots of pvc chips.

Cheers Bryan
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