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#Post#: 849--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: November 18, 2013, 9:19 am
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Hey all
Well my windmill survived last night's winds !(50 mph) I did
run into a problem though ! my pole was starting to turn, so I
was outside at 10:00 trying to prevent it from wrapping up the
cord. I didn't want it to break the wire going to the garage and
unload the windmill (from what I have herd not a good thing ) I
used a big vice that I use on the back of my truck(in trailer
hitch ) and 2 stakes to hold it from turning (least it worked )
but I will have to remedy this problem ! I don't have all the
data that everyone here has because I don't have the equipment
to measure wind speed,rpm etc.But I can tell you that the
batteries I have it hooked up to went from 12.26 volts to 12.45
I have uploaded a video for all to see of it spinning
[URL=
HTML http://smg.photobucket.com/albums/v74/sujsti/?action=view¤t=Video0000_zpsbd6b092b.mp4][IMG]http://vidmg.photobucket.com/albums/v74/sujsti/th_Video0000_zpsbd6b092b.jpg[/img][/URL]
#Post#: 851--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: November 18, 2013, 12:37 pm
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Definitely need a through bolt and the foundation needs to be
cross pinned in concrete with rebar or something. There is a
lot of torque in high winds so think about something like a 1/2
electric drill and what it takes to hold it from twisting.
Anything smaller than a 1/4" bolt will snap off in high winds.
Thanks for posting the video. My Gull 40 was an invisible blur
all night.
#Post#: 854--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: November 19, 2013, 11:57 am
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Hey all
I noticed another problem with my pole that holds the windmill
! it shakes side to side sometimes like its being blown by the
wind (which I know it 's not) but then it will stop and be rock
steady, then all of a sudden it will start again . could it be
the wind hitting the windmill from a different angle and causing
it to act this way ? Has any body else had this trouble ? I
placed some rope guy wires on it to tame it down and when I put
up the windmill I balanced it as close as I could get. This is
what I think caused the pole to start turning in the ground and
for this year I won't have the time or weather to cement it in
(the pole is 10 ' emt 1 1/2 and is in the ground 3 '
#Post#: 855--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: November 19, 2013, 1:33 pm
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Every time the VAWT turns at a TSR +1 (blades moving faster than
true wind speed) it will shudder a little bit. Normally this
will happen at about 8 mph and then the VAWT will spinup to hit
cutin and you wont notice it.
If winds are really gusty and strong this can happen at any
windspeed. It isn't as noticeable in a 15mph to 18 mph jump
because the VAWT is loaded at that point. You would see it on a
data logger as a voltage and power spike. But if your pole is
just stuck in the ground you probably will see the shudder as
gusts come and go. If you are seeing it, the power output is
going to be decreased a lot. A lot of power is going into pole
shaking and killing rpm.
These vertical mills depend more on a firm foundation than a
HAWT. Once you get a good solid foundation you may see 30% more
power output.
#Post#: 856--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: November 19, 2013, 7:50 pm
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Well I think it will be frozen in the ground soon !so it will be
in a solid foundation this year does that count
#Post#: 956--------------------------------------------------
Re: Seagull DIY Discussion
By: burnit0017 Date: December 5, 2013, 7:59 am
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Hi, I look forward to your results, be safe and gods speed
#Post#: 959--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: December 5, 2013, 12:03 pm
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Yes be safe CG don't want to undo all good ! glad to hear you
are doing better. I think I will change the oil in windmill
today ! and try a lighter one (like 3&1 ) we don't have to much
wind here today but if I get it spinning it will stay going for
a long time. I moved the magnets on the mag plate and have not
noticed any difference in output (still reading about 4 volts ac
) I have tried to measure current but meter will not read any
higher than .001 so may be this meter is not up to the task . I
will go out sometime and buy a little amp gauge to keep inline
when I go down to that end of town
#Post#: 981--------------------------------------------------
Re: Seagull DIY Discussion
By: burnit0017 Date: December 8, 2013, 3:26 pm
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Hi, are they set at the same angle?
#Post#: 983--------------------------------------------------
Re: Seagull DIY Discussion
By: lynx wind Date: December 8, 2013, 5:24 pm
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The shape is important. Actually on the Gull 40 and Gull 160
the blades are quite smooth and the airfoil is a 0024 on the
outside and a 0020 on the inside. You want the inside air not
disturbed and the outside air flowing out and away causing a
suction. If the blades turbulate the airflow you wont get much
power. Think smooth, like a ping pong ball. Look at video of
the Coanda effect with ping pong ball vs crumpled up paper.
#Post#: 989--------------------------------------------------
Re: Seagull DIY Discussion
By: sut Date: December 9, 2013, 11:07 am
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@Cg for the aluminum blades I used the same epoxy as Lynx
recommended in his diy 75 plans (5min. epoxy) I had a little
trouble with a couple of the ribs coming unglued when I opened
up the TE to insert glue,so what I did was just insert a little
more glue in to the part where it was coming apart. I think it
was not sticking because of not sanding the paint off
(aluminum)the edge where glue was being applied also NOT
cleaning all gluing edges properly with lacquer thinner. Lynx
had a good Idea of making the trailing edge an 1/2 inch longer
and folding it over to hold the TE together . When I put the
wings on rotor I used a bead of silicon all around both ends,
where it sits on rotor and also where wing tip sit on wing(I
think it helps keep aluminum put) I have not had any trouble
with them coming apart in strong wind so far or flexing in
strong wind. I don't think I would bother with a 3rd rib in
center because the wing has held up great so far and seems
ridged enough . I think you will like how easy the aluminum is
to work with and how nice it forms to the ribs. (all shaping
done with out ribs) I just used an razor knife to cut the
aluminum trim (few passes to cut through it ) or close then
finish bending back and forth to cause it to brake (be careful
not to cut your self on sharp aluminum ) I may have a slight
advantage with working with sheet metal cause I have been
working with it for many years in Hvac installation but you
shouldn't have any trouble just take it slow
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