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#Post#: 4884--------------------------------------------------
Re: Sail Blade VAWT
By: lynx wind Date: November 28, 2014, 8:48 am
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Really good. You have this figured out well. Just the TE
corner will attach to the rotor so the sail can shape. It can
be somewhat tight and will still shape with the wind. I am
curious how much flex there will be on the spar, and if the flex
outwards will equalize. My guess is this will work well.
#Post#: 4890--------------------------------------------------
Re: Sail Blade VAWT
By: baccula Date: November 29, 2014, 6:39 pm
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Progress continues. Over the holiday break I disassembled my
broken SG75 rotor and stator assemblies. Repairs are nearing
completion, just waiting for some silicon to set so I can pour
new resin. Here's the next teaser pic ;)
[IMG]
HTML http://i.imgur.com/oqIQHqUl.jpg[/img]
#Post#: 4892--------------------------------------------------
Re: Sail Blade VAWT
By: sut Date: November 29, 2014, 7:03 pm
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Looking good! not dragging your feet on this project! I cant
wait for you to give us some results
#Post#: 4894--------------------------------------------------
Re: Sail Blade VAWT
By: lynx wind Date: November 29, 2014, 7:49 pm
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I love the teaser pics! You have built exactly what I had in
mind. I was thinking about a bit wider at the bottoms but that
will require a different rotor. What you built should work
well.
#Post#: 4895--------------------------------------------------
Re: Sail Blade VAWT
By: nessprojects Date: November 30, 2014, 7:32 pm
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@baccula
Fantastic work and speedy too, Not so sure on the wing colour
choice though ;D
cannot wait to see if she spins good.
#Post#: 4903--------------------------------------------------
Re: Sail Blade VAWT
By: Cartichoke Date: December 3, 2014, 5:02 pm
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As these are sails, could you simplify the rotor, making the
paired "top/bottom" sails into one large triangle with an
obtuse angle? A "boom" across the sail at the middle could then
be attached to the rotor via a slim cable (aircraft cable?).
the "mast" could be a single pole and pass through a bushing at
the end of the rotor arm - which could be a pipe... maybe?
The angle of attack could then be adjusted by hauling in the
boom? Does the angle of attack differ at higher speeds?
Just some thoughts.
Can't wait to see this in action!! :) Well done!
#Post#: 4905--------------------------------------------------
Re: Sail Blade VAWT
By: rrattink Date: December 4, 2014, 1:59 pm
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This is what I was referring to. Sorry for the poor quality
graphic but you get the idea. ;)
#Post#: 4906--------------------------------------------------
Re: Sail Blade VAWT
By: rrattink Date: December 4, 2014, 2:05 pm
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I like this idea of portability a lot. What comes up for me is
maybe changing the rotor to a hexagonal shape with the sail
being a one piece triangular material as opposed to a top and
bottom sail. The center of the sail would then connect to one of
the hex sides thus matching the 60 degree angle. The support rod
would not go through the rotor as it would just attach to the
outside of rotor as well. This would make taking the device
apart as simple as detaching the sails from the rotor and
folding it up.
With the sail being one piece I would suspect that the wobble
seen in the video might be diminished somewhat as well.
Wadaya think??? :)
#Post#: 4907--------------------------------------------------
Re: Sail Blade VAWT
By: baccula Date: December 4, 2014, 4:27 pm
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@ness... Yes, the color was wife's choice, not my first ::)
@rrattink: My concern about that design is you'd have a lot of
excess weight with that rotor shape. Don't know if it shows in
the pics or not, but my spars go through, it's one piece for
both sides. I'm using shaft collars
(
HTML http://www.amazon.com/gp/product/B000P0QAG8/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
HTML http://www.amazon.com/gp/product/B000P0QAG8/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1)<br
/>epoxied on both sides of the rotor through-hole to secure the
spar. These particular ones use a worm screw to secure, but I've
seen quick-release lever types out there too. That would be
better for quick breakdown.
Regarding changing angle of attack, I'd look to Lynx or someone
much more knowledgeable than me. I was under the impression that
angle of attack would be fixed at an optimal position.
#Post#: 4909--------------------------------------------------
Re: Sail Blade VAWT
By: lynx wind Date: December 5, 2014, 7:29 am
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Keep the foot of the sail blade fixed for high speed and power.
I think the hexagonal rotor is fine, or you could try trimming
weight by staying closer to the tri-rotor design. Keeping the
sails tight more like blades will be best. The material will
pull out to an airfoil shape.
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