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#Post#: 991--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: December 9, 2013, 12:05 pm
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Nope sorry wish i did though! I think the last time we had 50
mph winds and my pole started turning has been the most wind I
have had and they didn't have any trouble (wish I had more test
for ya )
I don't think it will be a prob with TE bending over sharp
enough what I would do is put it in between 2 pieces of angle
iron to make the L bend before forming it into the shape of the
ribs (wing) then use same angle iron to finish bend after its
all glued .
#Post#: 992--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: December 9, 2013, 6:26 pm
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@ Cg I just re read your post and you said (concerning your
aluminum flashing blade skins :) Just to correct this I didn't
use flashing I used trim stock which is heaver . didn't want you
to try it with flashing cause I think it's to thin!
#Post#: 1003--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: December 10, 2013, 11:01 am
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Sorry I don't I got my trim stock from a neighbor that does
aluminum siding! But I went to the web sight and found this
HTML http://www.menards.com/main/building-materials/roofing-soffits-gutters/roofing/metal-flashings/14-x-10-aluminum-painted-roll-valley/p-1351571-c-5810.htm<br
/> I think its the same stuff I seen there. or MenardsŪ SKU:
1573057 I was going by feel cause its heaver than flashing
but still workable ( if I get time today I will run down and
see if its the same stuff I used )
#Post#: 1006--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: December 10, 2013, 4:09 pm
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Great experimenting, hypothesis and conclusions. So few people
actually build test and analyze results. That's what I like
about this forum. Everyone here is open minded and doesn't just
talk and talk about things, they "do it".
Everything works great on paper. But the details matter with
machinery.
#Post#: 1012--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: December 11, 2013, 3:01 pm
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I went and bought some of that trim stock from Menards and it is
.005 thinner so I am not sure its heavy enough But I am going
to try it anyway will keep you posted
#Post#: 1034--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: December 12, 2013, 5:40 pm
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Just a crazy idea. Why not glue some glass to some cardstock
and then paint resin on it? I know you don't like fumes, but
it's a ten minute job. Just sayin'
#Post#: 1113--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: December 20, 2013, 6:21 pm
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A quick question on the single phase alt is there a rpm where
it stops increasing voltage output the faster you spin it ? or
can it just keep going and continue to produce more voltage the
faster you spin it
#Post#: 1198--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: January 4, 2014, 9:46 am
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Good find. It's helpful to know why things don't work well, to
understand what does work well. I try to stay true to the
airfoil shape and end the TE sharp.
With a blunt or rounded TE the air doesn't flow straight back to
meet the next blade. Rather it tucks around and flows inward
into the VAWT. A smooth airflow will really create power.
#Post#: 1204--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: January 5, 2014, 4:38 pm
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If you turn an alternator faster and faster it will make more
voltage. It's linear. Once the voltage hits a load like a
battery's voltage threshold then the voltage can only rise as
long as the amperage rises. That's when it takes power to turn
the alternator. Volts x amps = watts 750 watts = 1 hp
How the power is converted has more to do with the load. A
resistive load like a heating element or lightbulb starts taking
power at 1 rpm. A battery starts taking power at some cutin
speed designed to match the power band of the turbine. A GTI
might start taking power at 14 volts or 28 volts.
Using an MPPT I have had alternators putting out 750 volts. 50
volts can be lethal so I like designing these turbines to stay
below 48 volts under load.
#Post#: 1207--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: January 6, 2014, 10:53 am
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Might be good for a rough adjustment. You'll need to be very
accurate on where you set the blade on the scale and where the
other blades sit in relation.
I balance mine by suspending the pole coupler horizontal on a
stub pipe. I note which blade hangs heavy and add weight to the
opposite side rotor until no one side will drop. Try to add
weight at the outermost spot on the rotor.
Building as light as possible is really helpful because any out
of balance is so much less than on a heavier construction.
Wobble really kills power.
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