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#Post#: 2927--------------------------------------------------
Re: backyard helix..
By: tri-lobe Date: May 24, 2014, 6:42 pm
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Lynx..
thanks for the reply and that info is great....I will use this
as a reference to compare to...
I think that there is a large amount of...slip...as in propeller
slip with motor boat props....this is just my personal
opinion....propeller slip can be a 10 to 20% loss...
this the reason that I built my blades the way that I have.....I
wanted to reduce wind slip on the outside of the blade....a lip
for the wind to bite into....
[img][/img]
these are off-cuts from yesterdays work...but they show the
profile well enough....curved lip to the outside....
thanks again for the info....
#Post#: 2929--------------------------------------------------
Re: backyard helix..
By: lynx wind Date: May 24, 2014, 7:17 pm
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Ahhh, I hadn't seen the airfoil. That may work much better than
the NACA 0020. How the heck do you bend the blades in the 3
directions? I barely could bend the foam. Took a ton of
clamps.
I found with the Gulls did 15% better with blade tips by the
way.
#Post#: 2930--------------------------------------------------
Re: backyard helix..
By: happygolucky Date: May 24, 2014, 8:53 pm
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@ tri-lobe i was just curious..when i think of a helical' s i
think a tornado action vacuum up draft.....
HTML http://www.canadiandesignresource.ca/green/darrieus-vertical-axis-wind-turbine/
lux designer nasa grant must be nice..
HTML https://www.google.com/search?q=lux+vawt&client=firefox-a&hs=0X4&rls=org.mozilla:en-US:official&channel=sb&source=lnms&tbm=isch&sa=X&ei=80qBU4UyxOewBOn8gcgK&ved=0CAgQ_AUoAQ&biw=1366&bih=631#channel=sb&q=vawt+wind+turbine&rls=org.mozilla:en-US:official&tbm=isch&facrc=_&imgdii=_&imgrc=Y5qzJTSCEzf2CM%253A%3BOqNwbENiXwJXrM%3Bhttp%253A%252F%252Fwww.seao2.com%252Fvawt%252Fimages%252FFan_animation.gif%3Bhttp%253A%252F%252Fwww.seao2.com%252Fvawt%252F%3B369%3B482
#Post#: 2934--------------------------------------------------
Re: backyard helix..
By: tri-lobe Date: May 24, 2014, 10:28 pm
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hey CG...
the blades are 2.5mm to 3mm thick...the plan was to sand the
high points down to around 2.5mm...
#Post#: 2935--------------------------------------------------
Re: backyard helix..
By: tri-lobe Date: May 24, 2014, 10:48 pm
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hey hgl..
thanks... now I know what you mean by lux....maybe there is
something happening on the inside of the mill...a low powered
vortex?
cheers..
#Post#: 2936--------------------------------------------------
Re: backyard helix..
By: tri-lobe Date: May 24, 2014, 11:17 pm
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Lynx...
to make the blade form...I started with a geo222 pvc blade....I
filled the blade with expanding foam.....then cut the blade into
25mm lengths...
I then made up a plywood length with the twist of 90 degrees
from one end to the to the other....I then glued the 25mm blade
sections together on this twisted form....
once pieces were glued together....I filled the joints with auto
body filler...then sanded smooth.....I ended up with a twisted
geo222 blade that was curved....
this became the form that I glassed onto...I would glass the
inside face..the LE..and the outside lip in one go...
I hope this helps.
#Post#: 2943--------------------------------------------------
Re: backyard helix..
By: tri-lobe Date: May 25, 2014, 7:02 pm
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Hello members...
after a successful day with the mill spinning in the breeze....I
pulled her down to start the building and glassing.....
I also wanted to strip the alternator to see what the story was
there.....I purchased this chinese mill for the alt...and it was
a gamble....
it looks like it was a good gamble.....and this is what I
found.....
I prized her open and could see wedge shape magnets....this
looks good...so I pulled some more....thinking gee there is some
magnetic force happening here....must be neo magnets....
excellent a resin cored stator.....but not only that she's got
a double row of magnets.....well I wasn't expecting this....
.....[img][/img]
#Post#: 2945--------------------------------------------------
Re: backyard helix..
By: tri-lobe Date: May 25, 2014, 7:26 pm
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alternator specs....
rotor...2 piece...12 mags in the top piece....12 mags in the
bottom piece...148mm dia for the body....od of mag ring 114mm...
mags are 4.5mm thick.....wedge shape mag size 28mm long, 28mm
wide at the top and 15mm wide at the bottom...
stator....resin cored at 148mm dia ....5.5mm thick with 9 coils
imbedded with in.....im not able to measure the wire dia for the
coils at the moment.
I think I need to set this alt up in the lathe .....spin her at
different speeds and measure with a load on....
this might have been a good gamble....
#Post#: 2948--------------------------------------------------
Re: backyard helix..
By: lynx wind Date: May 25, 2014, 8:10 pm
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That looks like a very nice alternator. Be careful spinning in
a lathe. I have had people ruin alts by loading them too much
and spinning at high rpms. They'll turn and fry the wiring.
Just measure the Ohms between two phases and get an Open Circuit
voltage at some convenient rpm (60-100rpm) from there I'll
profile the alt for you.
The alternator looks a lot like the one in the Rutland wind
turbine made by Marlec.
#Post#: 2949--------------------------------------------------
Re: backyard helix..
By: lynx wind Date: May 25, 2014, 8:32 pm
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You guys might find this entertaining. Its an old video and
shows the Helical alongside an early Gull type VAWT. Turn the
volume up and listen to the sound of the alt producing power.
The blades were too long to be well supported and the axial
bearing on top the stator took a pounding. It was 6' in height.
The new SeaGull 175 will have a height of about 49"
Also toward the end watch the telltale inside the VAWT and how
calm it is. I did a lot of research on what makes these blades
work and what happens inside and outside the turbine.
HTML http://youtu.be/Ewdp-fgYiLI
HTML http://youtu.be/Ewdp-fgYiLI
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