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#Post#: 1520--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: February 13, 2014, 8:52 pm
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Humm never thought of a ball bearing in bottom on the bolt
!(good idea ) but I do have a bolt that's tapered to a rounded
point that the magnet plate bolt rides on . I am using pneumatic
oil that I use in my air tools , thinnest oil I have on hand.It
turns pretty easy so maybe the location and height probably has
more to do with it I can reach up and spin it from the ground
#Post#: 1522--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: February 14, 2014, 7:40 am
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@CG nice job on wings ! And the bearing in tube is a great
idea, I will have to go looking for some in garage
Sometimes I swear I am getting senile! I went back and read some
of the older posts and couldn't believe how much I missed or
forgot, on what someone had posted (like I was reading it for
the first time )
I made one of the new wings last night with the aluminum from
menards and not real happy with the thinner aluminum. I didn't
like the way it bent and how flexible it was compared to the
trim stock I got from my neighbor . Now I didn't put in the
formers and glue it all up but it will need 3 formers !(GRR) I
still will glue it all up and see what becomes of it . I weighed
just the wing and it came out at 150 grams and that's without
the formers ! bought some Goop (so many to choose from ) I ended
up just buying the household goop and glued 2 pieces of scrap
aluminum and boy it holds .
#Post#: 1525--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: February 14, 2014, 11:17 am
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THX @Cg Well I just glued up my wing made out of the thinner
aluminum and it came out ok but not as nice as the thicker stuff
and my center form didnt get enough glue on it so it has a gap
in it. it flexes a little bit when you press in on the sides
Nice to have the work time with the goop on this app,(so much to
glue at 1 time ) I just asked my neighbor for a another piece of
aluminum and I will make a new wing as soon as he gives it to
me, keep you posted, time to go look for a bearing to put in
bottom of windmill bearing .
#Post#: 1526--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: February 15, 2014, 7:36 am
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@CG I had a thought about you filling the wing with pourable
foam it may be better to pour it in 2 sections you could put in
a balloon to fill 1/2 of the void in the wing then bust the
balloon and pour the 2nd half Just thinking
#Post#: 1527--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: February 15, 2014, 8:59 am
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;D Ok I just dropped a bearing down the bearing tube so its
riding on the bearing! and it made a difference in its ease of
spinning !! in fact its turning as we speak :) I know I have
to adjust the bolt so magnets are closer to stator (so its
running with a lighter load on it now ) but at least it turns !
I had to come inside and warm up (burr that wind is cold ) so
thanks to @CG & LW for that information
#Post#: 1530--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: February 15, 2014, 9:23 am
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After thinking about it you plan to use 3 formers in each wing
right,( it takes 2 pieces to make 1 complete wing (1 wing above
rotor and 1 below rotor ) so the wing (each 1/2 wing ) will have
2 open sections in it if you use 3 formers . If you only use 2
formers in each wing (one former at top and one at bottom ) you
have a open cavity that's 18 inches long so the balloon would
stop the foam from having to fill that whole section of 18
inches, making the pour only 9" it had to fill at 1 pour . Then
turn wing over and take balloon out and pour the last part Hope
that helps I wish I could use a program to show you what I
meant but it would take hrs to try and do it in MS paint
#Post#: 1535--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: February 15, 2014, 11:47 am
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Yes I understand now how you plan on doing this, My Idea with
balloon was just to make it a 2 pour job that way you didn't
have to try and fill the hole 18 inches at one time and may be
have voids in foam because of difference in expansion of foam.
You could glue in both former (top and bottom ) then drill a 1/2
hole in top former to pour in foam then foam would fill the hole
(expand out ) then just cut it flush after foam was dry
Well I froze to death (and hoping the ladder didn't sink into
the snow and tip over ) finishing the ball bearing in tube and
adjusting magnet gap, BUT it was worth it ! Now their is a light
breeze and windmill is turning at 50 rpm (I know because I
counted revolutions) and when it stops the slightest breeze
starts back up thx again for Re mention the ball bearing in
tube
#Post#: 1536--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: February 15, 2014, 12:45 pm
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That's great news on your startup SUT. Thank you CG for the
fantastic drawing of the Seagull's hub.
Locating a wind turbine away from obstructions will really help.
Hopefully you can correlate voltage, watts and windspeed and
report back. You should see cutin to 12 volts at 7-9mph wind.
Anything below 7mph there really isn't more than 2-3 watts of
power. And remember that power goes up by a factor of 8 when
windspeed doubles. So until winds reach 10-12 mph it's tough to
measure.
#Post#: 1541--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: February 16, 2014, 6:50 am
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@ LW so are you saying any wind that's below 7 mph does not
turn your windmill fast enough to make the power or does not
have the force to make any usable power using a different
configuration of wings and or stator
#Post#: 1542--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: February 16, 2014, 8:15 am
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I am saying it will go around, and maybe even quite fast, but
the power in the wind for the swept area is quite small, and the
most you may get is 40% of that due to physics. So if there is
5 watts of power you may get 2-3 watts. Look up power in the
wind for your swept area in the calculator on the lynxwind site
or at USVAWT.
A rule of thumb I apply is - if you can't fly a kite there isn't
much power.
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