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#Post#: 3826--------------------------------------------------
Re: Alunimum wings for diy 75
By: lynx wind Date: July 11, 2014, 8:14 am
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I'll "stick" some in the box. You are going to wonder how you
ever got along without it.
#Post#: 3828--------------------------------------------------
Re: Alunimum wings for diy 75
By: nessprojects Date: July 11, 2014, 5:07 pm
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Many thanks for all the reply`s guys.
My thoughts turned toward araldite rapid which is a 2 part mix
(resin/hardener) which I have used to glue almost everything, I
know it glues steel to steel and wood to wood but you don't get
a lot of the stuff. Sets in about 10 minutes but stays a little
flexible.
I can get various caulk glues from town but have never looked or
needed to glue aluminium before so never checked capabilities.
I am sure I would be able to get something like your `goop` but
called a different name.
#Post#: 3871--------------------------------------------------
Re: Alunimum wings for diy 75
By: sut Date: July 16, 2014, 8:48 am
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I tried that with great stuff expanding foam you get in a can
and it will still push out the sides not as bad but you can see
the deformities in the wing . Now what I have been thinking
about is making a wing former form out of wood and filling it
with foam and using that as the formers
#Post#: 3894--------------------------------------------------
Re: Alunimum wings for diy 75
By: sut Date: July 18, 2014, 7:20 am
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That's probably where the primer would of helped ! but you still
would of had to buy 2 cans of paint . You mentioned your wings
were 1/4 inch to long for your straps; What I would do is sand
them down to the size that will work unless you have longer
straps . They sand down good on a disk sander once glued to
formers, Just make sure you ware protective eye ware ! you don't
want a piece of aluminum in your eyes . just a thought to save
you some money
#Post#: 4195--------------------------------------------------
Re: Alunimum wings for diy 75
By: nessprojects Date: August 17, 2014, 8:59 am
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Had a little brain storm today.....It was mentioned about the
possibility of requiring extra wood formers added to the
inside(centre) of the aluminium blades to stop the blades
crushing or de-forming......How about cutting 3/4" polystyrene
blade formers, Double sided sticky tape around the formers then
stuck to the inside of the blades before the glue is put on the
TE.
Hard to explain but sort of like the ribs on a aeroplane but
made of the white packing polystyrene. They are very light and
only along for the ride.
Its just a suggestion as I have not started the blades
yet.....Is it necessary ?
#Post#: 4200--------------------------------------------------
Re: Alunimum wings for diy 75
By: sut Date: August 17, 2014, 10:41 am
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I see what you are saying but I don't think it's necessary , I
have not had any deformation that I can see on any of the wings
. It couldn't hurt though, but if you deiced to put them in I
would make sure you cut them short enough not to interfere with
the gluing of the TE and make sure they don't do the opposite
bulge the wing out where they are . When you do bend the
aluminum and glue in formers I think you will see how strong
they are, but they have not seen high winds for any long
testing.
#Post#: 4201--------------------------------------------------
Re: Alunimum wings for diy 75
By: lynx wind Date: August 17, 2014, 10:51 am
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I can confirm that the aluminum SUT blades with just the two
formers top and bottom are far stiffer than full length foam
covered in plastic (as are the original Gull 160 blades) I can
take a SUT blade and try as hard as I can to twist it. If I did
that with the foam blades they would definitely twist.
High wind testing will confirm the strength.
The only thing I am seeing with the new 175 design is that it is
less responsive, but again I haven't had decent wind in weeks.
At 12 mph and over I know we will be glad for the more rugged
design.
I haven't needed any sort of wind tunnel in years of testing,
but now I am tempted to rig something up. This has been a very
cool calm summer in Michigan.
#Post#: 4204--------------------------------------------------
Re: Alunimum wings for diy 75
By: nessprojects Date: August 17, 2014, 4:27 pm
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Thanks guys.....It was only a brain storm and once I have a
blade bent I am sure I will see it in a different light.
Be patient Lynx, I am sure the wind will appear soon but I know
it can be frustrating.
#Post#: 5300--------------------------------------------------
Re: Alunimum wings for diy 75
By: maximoney1 Date: January 29, 2015, 9:34 am
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Just posting an idea, don't know if lynx or sut could adapt it
to speed up the formation of the airfoils (see pic attached for
a rough idea).
cheers
HTML http://www.imageupload.co.uk/images/2015/01/29/img102kYNhW.jpg
HTML http://www.imageupload.co.uk/5hRr
#Post#: 5302--------------------------------------------------
Re: Alunimum wings for diy 75
By: maximoney1 Date: January 29, 2015, 9:54 am
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thanks CG, but on that link, it says video does not exist. :'(
It says underneath, attachment deleted by admin !
The spring steel in drawing above is only the former, ie part of
the 'mould'. I presumed the finished airfoil would actually be
stiffer, being filled with supporting foam, which was densely
packed in, less likely to deform due to extra overall support &
lighter using the thinner aluminium sheet?
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