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Jarbar
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Posted: 05 February 2008 at 6:26pm | IP Logged Quote Jarbar

Hello Peter,Im impressed with your efforts.Thanks for taking the time to show us what you have done.I am also in the process of producing a Savonius and I will be looking forward to your results for comparison.I also visited your webpage and was stoked with what you have achieved.Electric vehicles ect.Well done and inspired.
Anthony.

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Jarbar
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Posted: 05 February 2008 at 6:36pm | IP Logged Quote Jarbar

Hello again.One more comment regarding noise from cogging.I had the same issue with the drums amplifing the cogging sound and was ready to give the project away.But as I suggest in another part of this site i took up another members idea of twisting the poles and the noise has virtually dissapeared.I have posted some Photos and dimensions for same.Although yours will be a little different.If I'm over visiting my wifes family in Belgium Ill call in for a look.

Anthony.

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Jarbar
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Posted: 05 February 2008 at 7:47pm | IP Logged Quote Jarbar

Hello again,what criteria did you use to detirmine your overlap of drums about the axle and the apperture between the axle and inside edge of drums.ie was there a formula for transfer of air volume from one drum cup to the other and did this detirmine the apperture.

Anthony.

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Gizmo
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Posted: 05 February 2008 at 7:52pm | IP Logged Quote Gizmo

Good work Peter. I like the YouTube video, its good to see the vertical windmill working for you.

Anthony I had a noise problem with my Lenz2 vertical windmill. Sounded like a motor bike in the back yard! I rounded my stator poles and also had a big reduction in noise. It was suggested at the time I try a rubber coupling, never did try it but I think it would work. I think the old Fiat cars used a rubber coupling as a universal joint, could be worth giving one of those a go.

Glenn

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Jarbar
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Posted: 05 February 2008 at 8:28pm | IP Logged Quote Jarbar

Hello again Peter and Glenn thanks for your suggestion.Peter could you tell what is the height is of the drums you have used.I am trying to accertain if they are a standardised height globally and what radius/diam the projecting rolled edge is on the top and bottom of drum from manufacture.ie where top and side of drum are joined.In my makeshift wind tunnel and pursuant to other literature on wind turbulance I feel a small modification to your mill may help.By attaching (weld) a strip of metal approx 30mm wide x 2mm thick along the trailing edge of each drum cup from the rolled edge top to bottom rolled edge and picking up the two rolled ridges with a rivet.One it makes the edge stiffer and two it in my tests reduces the turbulance off the trailing edge.As the air passes through the gap created along the trailing edge a more laminer flow is created.Hence improving effiecency.If you consider this a reasonable conclusion and try it out I am most interested in the data before versus after.Sorry to pester you with so many posts but this site is just ace for like minded windheads to communicate.
Again well done.
Anthony.

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retepsnikrep
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Posted: 06 February 2008 at 1:00am | IP Logged Quote retepsnikrep

I used standard 45 gallon drums, sorry I don't know the height off the top of my head. The apperture in my case is about 1/4 width of drums. A bit small really.

I'm moving onto MK2, now so won't be tinkering much with this one.

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Jarbar
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Posted: 06 February 2008 at 7:00am | IP Logged Quote Jarbar

I am just looking at making a generic frame work axle to support Savonius drums that I may try to market one day so the variation in height interest me.When you get a chance a dimension would be apprieciated.But no hurry.

Anthony.

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Tinbender
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Posted: 14 February 2008 at 10:00am | IP Logged Quote Tinbender

Peter! Peter! ...Look What I Got!

<------- It landed in my yard after that last hard wind.


Edited by Tinbender on 15 February 2008 at 4:21am


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retepsnikrep
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Posted: 14 February 2008 at 5:15pm | IP Logged Quote retepsnikrep

Hey Tinbender, that's my VAWT very neat avatar. Nice one. Can I have it please.

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Tinbender
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Posted: 14 February 2008 at 6:32pm | IP Logged Quote Tinbender

Of course... Just right click and "Save Picture As" to your computer, then upload as your Avatar. I'd like to get videos of everybody's windmills and make all kinds of Avatars. This whole place would be lit up with turbines spinnin on every page.
I tricked it out and made some clouds go flyin by.
I want to how you have your alternater wired and how it's workin. Let me know

Brian


Edited by Tinbender on 15 February 2008 at 5:22pm


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absinthe
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Posted: 12 September 2008 at 11:40pm | IP Logged Quote absinthe

did you modify the lg motor in any way or just use the standard wireing?
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