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#Post#: 6237--------------------------------------------------
Re: Aluminum Bladed VAWT
By: LynxWind Date: February 2, 2017, 6:51 pm
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Great information. The Bernouli effect is at work. Instead of
the TE trying to get into the airstream with outward pull the TE
is trying to get into the airstream with inward pull. If the
direction of force is in front of the axis the wind turbine will
turn. If it works it works.
I was experimenting the other day with the TE inward far more
than what i normally use. What a Dud! It wouldn't start and
often ran backwards. I think what you have discovered is just
how delicate but flexible the angle of the blade has to be.
#Post#: 6238--------------------------------------------------
Re: Aluminum Bladed VAWT
By: sut Date: February 3, 2017, 8:25 am
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I moved the wings back to where they should be and it seems to
be a little faster, going by my volt meter but who is to say for
sure because I have no way of measuring the wind speed . It
still starts in very light wind and was putting out 7 V ac for
most of the day with gusts up to 15V . I noticed that at 15v the
wings are starting to flair out and no drop in speed so it
looks like I will be adding wing bracing. The single PVC pipe in
wing is so far holding up with no effect on aluminum wing shape
(no former's)
#Post#: 6239--------------------------------------------------
Re: Aluminum Bladed VAWT
By: sut Date: February 7, 2017, 9:07 am
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I installed wing supports to reduce wing flair out on high speed
(what a pain) I used fiberglass rods and pieces of PVC.
Installed wing tips made out of same aluminum used for wings
(riveted to wing )
HTML https://drive.google.com/file/d/0B5KUgNgaszekR2FHZUxyOVJyd00/view?usp=sharing<br
/>
#Post#: 6242--------------------------------------------------
Re: Aluminum Bladed VAWT
By: sut Date: February 13, 2017, 8:27 am
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Saw some decent wind yesterday and my windmill came through it
all unharmed, I didn't notice any flaring of the wings when it
was spinning fast unloaded, It was putting out 25v ac . Adding
the top wing supports really stiffened the windmill I dont think
it would of stayed together without them . I took a amp reading
going into a 12v battery was .11 which I thought was low so I
checked out the ohms in line going to the windmill and found it
had 45 ohms resistance in the line . I don't know how much that
would effect my output but I know it cant help. I checked the
ohm reading at the stater and it read 6.3 ohms big difference,
so now to check where I am getting resistance from.
#Post#: 6245--------------------------------------------------
Re: Aluminum Bladed VAWT
By: LynxWind Date: February 13, 2017, 6:04 pm
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Its a good thing you strengethened the design. Yesterday we had
very strong dense cold winds. 6.3 ohms in the stator is typical
and in the range of most PMA of this type. The 45 ohms in the
line is not good and is acting like a heating element sucking
power. Most likely connections and not the wire. I had a bad
connection on a stator once and it got hotter and hotter and did
some damage. In high winds you could see it arcing.
I don't take enough time to weather proof connections and so
after a few weeks I get corrosion.
#Post#: 6249--------------------------------------------------
Re: Aluminum Bladed VAWT
By: sut Date: February 15, 2017, 8:45 am
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I had multiple problems in wiring! first one was squirrels
thought my wire was chew toy! that was the worst one but also
after fixing that I went and eliminated 1 UN-needed connection
and cleaned the rest . I figured that using dialectic grease
would be a good idea to help keep everything up to snuff and
dry, now including stator its reading 7.5 ohms.
#Post#: 6260--------------------------------------------------
Re: Aluminum Bladed VAWT
By: sut Date: March 9, 2017, 10:03 am
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Well my test PVC windmills made it through the big blow
yesterday! My big one with top and bottom wing supports worked
good,the little one which does not have any supports on the top
and bottom also came through it but I noticed that the wings
were flaring out at high rpm. The PVC with just screws holding
it together worked, but I noticed that everything is a little
out of wack so I will glue all of the joints which should take
care of that .The small one only has 6" PVC pipe extending into
the wing and former's at the top of the wing. The aluminum wing
didn't bend or cause any trouble not having any supports in it
(the top former is just there to make it easier for me to attach
the wing tip) Below is link of picture I took while it was
spinning notice how the wing has a bend in it
HTML https://drive.google.com/file/d/0B5KUgNgaszekOF9QeTFLWEYxdzQ/view?usp=sharing<br
/>
#Post#: 6261--------------------------------------------------
Re: Aluminum Bladed VAWT
By: lynx wind Date: March 15, 2017, 10:01 pm
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That is impressive and a very good looking wind turbine. It
looks like something NASA would make.
I was in CA when the winds tore through here. Both my Seagull
60 and Seagull 30 made it through unscathed. Many trees down in
the neighborhood, power line snapped, power out. I meant to
turn off both wind turbines before leaving for CA, but I forgot.
They are anchored on the second floor deck and tend to rumble
when they make big power so my wife was probably irritated and
didn't tell me.
I am intrigued that your blades withstand heavy loads without
snapping off. PVC is a great material to bend without breaking.
Does the material completely return to straight or do you think
it will bow slightly?
#Post#: 6262--------------------------------------------------
Re: Aluminum Bladed VAWT
By: sut Date: March 16, 2017, 8:16 am
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Well so far it has returned! (kinda scary seeing the wing tips
flaring outward ) Now when the big blow came through nothing was
glued together I just had sheet metal screws holding it
together, the joints could move and did! leaving everything out
of alignment .Now I have glued the wing supports into the T and
it has helped greatly on holding everything where its meant to
be. The rotor arms are not glued into the T just held in place
with 1 screw, I am still experimenting with length (diameter )
of the windmill. This windmill has my old alt on it and it does
not put hardly any load on anything but it sure does spin fast
and easy, also I am in a mixed wind area! lots of trees .
#Post#: 6281--------------------------------------------------
Re: Aluminum Bladed VAWT
By: sut Date: September 6, 2017, 9:47 am
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I made a small PVC windmill this summer just to see if it would
work and added to the wing tips a new Idea Ill call wing tip
lets
This is the pictures of new wing tip lets! Now I dont expect
much out of them but just maybe it will help getting it spinning
in low wind
HTML https://drive.google.com/open?id=0B5KUgNgaszekWjVLWFhFc2NVTzg
HTML https://drive.google.com/open?id=0B5KUgNgaszekVEhQd29ucHQzNjQ
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