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Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Wed, 05/25/2016 - 10:59
A theory to determine the optimum chord for a H-Darrieus rotor with a certain rotor diameter D and a certain number of blades B is given in chapter 3 and 4 of my report KD 601. The theory is derived from the theory of horizontal axis wind turbines give...

Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Wed, 05/25/2016 - 06:02
Jim Sencenbaugh, who did a lot with wood blades, was using a heat-shrink Ceconite dacron "sock".
http://www.aircraftspruce.com/

He would seal the wood with epoxy (West Systems), shrink fit the fabric, then epox...

Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Wed, 05/25/2016 - 05:45
QuoteI dont understand my friend please draw

Airfoil characteristics

Wed, 05/25/2016 - 04:59
At the menu KD-reports of my website www.kdwindturbines.nl you find several reports with aerodynamic characteristics of Götingen airfoils which are measured for low Reynolds numbers and which therefore can be used for windmill rotor blades. The report ...

Re: Any other home brewers on here?

Tue, 05/24/2016 - 19:04
Way out of my budget! The wood is fine, it won't burst on fire is I put a circular heat shield a couple inches above it. The hot spot under the burner is only a 4 inch circle.

Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Tue, 05/24/2016 - 14:42
Quote from: midwoud1 on May 24, 2016, 02:36:55 PMPut the glasfiber  tissue like a sock on the blades . Strings in the blade lenght.
 Rgds. Fb  Midwoud1
There are also examples

Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Tue, 05/24/2016 - 14:38
continue

Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Tue, 05/24/2016 - 14:36
Put the glasfiber  tissue like a sock on the blades . Strings in the blade lenght.
 Rgds. Fb  Midwoud1

Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Tue, 05/24/2016 - 14:33
continue pictures

Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Tue, 05/24/2016 - 14:30
keep working

Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Tue, 05/24/2016 - 13:04
Quote from: kitestrings on Today at 11:14:16 AMatasan,

I'm curious why you wouldn't run the blade netting length-wise don the blade, rather than having many joints along it where it is flexing the most?  Maybe it doe...

Re: CENTİRİFUGAL WİND TURBİNE

Tue, 05/24/2016 - 11:19
I think some of the early designs with this type of variable pitch had a magnet "hold" from the starting position.  Once the forces overcame the magnet force the spring-loaded mechanism, coupled with a shock absorber allowed the blades to rotate.  Quir...

Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Tue, 05/24/2016 - 11:14
atasan,

I'm curious why you wouldn't run the blade netting length-wise don the blade, rather than having many joints along it where it is flexing the most?  Maybe it doesn't matter once it is coated.  Just a thought.

Best, ~ks

Re: Any other home brewers on here?

Tue, 05/24/2016 - 00:28
Maybe talk to a sheet metal guy just for curiosity sake.  You can probably find a tinner that would help you cover that wood.  If you're worried about heat use an airgap or insulate under a metal covering.  You should be able to talk them into a sheet ...

Re: Salt water batteries

Mon, 05/23/2016 - 19:56
The last salt water batteries I came across was some 40 years ago and they were in a torpedo. They were about 1 foot across and 3 feet long and generated 50kw for 6 minutes. Most of the sea water that was pumped through them was for cooling!! No surpri...

Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Mon, 05/23/2016 - 13:57
Thank you very much for your advice, my friend SparWeb

Re: Salt water batteries

Mon, 05/23/2016 - 13:23
I have done some initial investigation (and spoken to a sales droid) and they seem real, but big and heavy, and I don't know the charging parameters yet.  Some of the more programmable charge controllers will probably be able to handle them fine, but I...

Salt water batteries

Mon, 05/23/2016 - 12:26
I read an article and looked up some information on salt water batteries. Has anyone here seen any or does anyone have them. Sounds ?? but I am also wondering if they really work for off grid usage? I sent a requested for more information but no answer...

Re: free KD-reports and manuals

Mon, 05/23/2016 - 09:29
Adriaan,
I found some time to read further and was rewarded by finding #571 and 35 again.

Since most of the turbines I see on your site have aluminum blades i am curious about your experience with those.  There is a bias in the public eye, as far as I ...

Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Sun, 05/22/2016 - 17:57
Ambitious stuff!

I believe you will do better with 3 steel tubes as your struts, rather than lattices.  While the lattice can be much lighter, the drag will be tremendous.

Also the cross-bracing that you draw like this:

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