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1. 12:38 AM - Re: Substituting 020 for 016 (mcjon77)
2. 01:59 AM - Re: Re: Substituting 020 for 016 (JG)
3. 01:06 PM - Re: Substituting 020 for 016 (mcjon77)
Message 1
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| Subject: | Re: Substituting 020 for 016 |
Great info, as always guys. Thanks a lot.
It seems that the number one issue in favor of such a mod is ease of handling during
construction, and the number one detriment is obviously the 30lbs+ of additional
weight.
I brought this up after seeing some 701 wings with waves/wrinkles in them. An
example can be seen in this pic on the Zenithair website.
I know the 701 is structurally sound. It has proved that all over the world.
I just hat the looks of those wrinkles (I have heard that the factory demo plane
has the same wrinkles, but can't confirm it).
Have current/former owners noticed these types of waves/wrinkles in their wings?
Would the false ribs eliminate the wrinkles seen here?
Thanks again.
--------
Jon McDonald
Building Sonex #1287
Next up CH 701 :D
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=289755#289755
Message 2
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| Subject: | Re: Substituting 020 for 016 |
Yes, those waves/wrinkles can be easily and effectively eliminated, with
very little weight penalty.
Intermediate foam ribs, stuck in with Sikkaflex or similar polyurethane
adhesive. This adhesive needs a thick bead to cure properly, and then it's
still slightly flexible and pretty much indestructible. So cut the ribs
2-3mm inside the profile of the aluminum ones. Also cut a couple of holes in
the foam ribs to allow air circulation. The foam is the closed-cell
polyurethane foam used by fibreglassers, 10mm (3/8") thick. When the wing
is ready to close, and the the skin remains fair when the pinned down with
clecos, open the top skin, and stick the intermediate foam ribs onto the
bottom skin with a thick bead of adhesive. Check with a straight edge to
see that all foam ribs are 2-3mm below the Al ribs. Place a tick bead of
adhesive on the top surface of the foam ribs, and rivet down the top skin.
The adhesive bead will adjust to any variations to keep from stressing the
skin, then remain exactly in that position when the adhesive is cured. The
foam ribs are plenty strong enough to hold the thin skin in place, and
prevent waves and oil-canning. If you want a really 'solid' feeling wing,
then place two intermediates. It all adds up to only 1-2 lbs extra weight,
for a really effective solution, and a very satisfying result. Tried and
proven several times, with excellent results.
JG
On Tue, Mar 9, 2010 at 6:37 PM, mcjon77 <mcjon77@yahoo.com> wrote:
>
> Great info, as always guys. Thanks a lot.
>
> It seems that the number one issue in favor of such a mod is ease of
> handling during construction, and the number one detriment is obviously the
> 30lbs+ of additional weight.
>
> I brought this up after seeing some 701 wings with waves/wrinkles in them.
> An example can be seen in this pic on the Zenithair website.
>
>
> I know the 701 is structurally sound. It has proved that all over the
> world. I just hat the looks of those wrinkles (I have heard that the
> factory demo plane has the same wrinkles, but can't confirm it).
>
> Have current/former owners noticed these types of waves/wrinkles in their
> wings? Would the false ribs eliminate the wrinkles seen here?
>
> Thanks again.
>
> --------
> Jon McDonald
> Building Sonex #1287
> Next up CH 701 :D
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=289755#289755
>
>
Message 3
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| Subject: | Re: Substituting 020 for 016 |
Thanks for the EXCELLENT information, JG.
--------
Jon McDonald
Building Sonex #1287
Next up CH 701 :D
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=289825#289825
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