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#Post#: 2785--------------------------------------------------
Re: Alunimum wings for diy 75
By: lynx wind Date: May 17, 2014, 8:57 am
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We are debating whether or not to glue formers into the blades
or fasten to rotor/blade tips. There is a lot to consider.
Assembly, flexing, stress points. There is a tendency for the
upper blade to rock forward in high winds. This pinches the
blade as it moves diagonal. The hope is that the stress will be
spread over a wide area instead of just the LE/and TE points.
For this first testing we decided to glue formers into the
blades. The blades become very stiff and strong and will then
slide onto the spars. The blades float with about a 1/64"
clearance when the blade tips are bolted on. Without the
clearance the blades could be deformed as the bolts are
tightened.
SUT chose a very strong adhesive called Seam Sealer. Once cured
it is slightly flexible but stuck for good. Because of the way
the blades are designed the adhesive just has to resist a
sheering force across a 12 sqin bond. Only use epoxy for areas
that don't flex.
#Post#: 2791--------------------------------------------------
Re: Alunimum wings for diy 75
By: happygolucky Date: May 17, 2014, 9:34 am
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thanks for the update Lynx don't know wither to make wings or
wait now.. could make them an not glue any thing together it is
48" top to bottom minus caps or plus the caps? are wings 24 "-
3/4 ply what are the wing lengths?.
#Post#: 2799--------------------------------------------------
Re: Alunimum wings for diy 75
By: sut Date: May 17, 2014, 10:33 am
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Just remember looks change everything the bigger the windmill
the slower it looks at spinning and how I perceive it
#Post#: 2823--------------------------------------------------
Re: Alunimum wings for diy 75
By: happygolucky Date: May 18, 2014, 7:43 pm
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@lynx/@sut /@ness/@cg/any updates on the new sut air foil
blades? wind speed analysis performance test?..how are the
preforming on the 175 ? an 75?
#Post#: 2825--------------------------------------------------
Re: Alunimum wings for diy 75
By: sut Date: May 19, 2014, 8:36 am
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@ hgl I have been using the wing on the diy 75 for 6 months and
have not had any trouble with them.They have seen alot of
wind,snow,ice, and look like brand new!Now as far as the new 175
blades they have only seen 1week of service so far and not much
wind.I don't see any trouble with them holding up but that's Jmo
build at your own risk. They are a longer blades and are turning
a bigger alt.
#Post#: 2826--------------------------------------------------
Re: Alunimum wings for diy 75
By: happygolucky Date: May 19, 2014, 9:35 am
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thanks @ sut i understand ..
hgl
#Post#: 3818--------------------------------------------------
Re: Alunimum wings for diy 75
By: sut Date: July 10, 2014, 6:22 pm
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When I glue TE I open up wing and just put it on edge with no
fold in it, then close wing and force TE together with a thin
piece of steel like a yard stick but it has to be thin (has to
fit in TE good ) inside of wing . Then after glue has set (24 or
more HRS) I tape TE with masking tape on both sides of seam (app
1/8 wide) then use silicone( 100%) to seal seam from weather .
Also I have found that warming tube 2hrs before use helps it
come out a lot easier ! You need to clean up those old tips and
keep them on hand just for the times when you need one , I bet I
have 6 or more laying around (don't throw them out )
#Post#: 3822--------------------------------------------------
Re: Alunimum wings for diy 75
By: sut Date: July 10, 2014, 9:53 pm
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@ Nessprojects you getting all of this, your next ! you have
an arsenal of things to avoid LOL This is what testing is all
about finding what works and what does not.
#Post#: 3823--------------------------------------------------
Re: Alunimum wings for diy 75
By: nessprojects Date: July 10, 2014, 10:29 pm
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I am trying to let it all sink in but the old grey matter
upstairs might not retain it all. ;D
Still got to work out what glue to use because `goop` is a alien
name to me.....I am sure it will all come out in the wash as
they say.
#Post#: 3824--------------------------------------------------
Re: Alunimum wings for diy 75
By: sut Date: July 11, 2014, 7:56 am
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Hmm Never thought of that maybe @ Lw could include it in your
kit? what products do you have on the other side of the pond ?
any all purpose glues that come in a tube and stick to metal,
wood .
HTML http://www.eclecticproducts.com/all_purpose.htm
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