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Wet W10 wings anyone?

PostPosted: Fri Mar 30, 2007 8:40 am
by rx7tailwind
Has anyone built a wooden wing with fuel tank in it? Any thoughts?

Wing Tanks

PostPosted: Tue Apr 03, 2007 5:58 pm
by planecrazzzy
I have seen...and will post a picture of a guy that built a wood wing with a BIG fuel tank in it....

Myself , I'd be happy with 5 gals or so in each wing to help the main tank....

Here's the picture...

Gotta Fly...
Mike in MN

W10 Wet Wings

PostPosted: Sat Apr 05, 2008 12:51 am
by Allen
Mike,

Has that guy flown his plane yet?  Is it a Buttercup or a Tailwind?

Allen in Anchorage

Re: W10 Wet Wings

PostPosted: Sat Apr 05, 2008 5:16 pm
by planecrazzzy
Hi Allen,
             It's a Tailwind Wing....I don't know if it's in the air yet....

 You could "copy " the picture.....Send it to the Tailwind site and ask them....

                                             Gotta Fly...
                                                             Mike & "Jaz" in MN
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Allen wrote:Mike,

Has that guy flown his plane yet?  Is it a Buttercup or a Tailwind?

Allen in Anchorage

Re: Wing Tanks

PostPosted: Thu Jun 11, 2009 8:25 pm
by aerodesign
planecrazzzy wrote:I have seen...and will post a picture of a guy that built a wood wing with a BIG fuel tank in it....



Here's the picture...

Gotta Fly...
Mike in MN


It seems that guy understands a little at all what`s he doing :?

Re: Wing Tanks

PostPosted: Fri Jun 12, 2009 10:53 am
by planecrazzzy
I don't see how you could say anything.... it's not finished... How do you know what it'll end up like ???

If he ties that tank in somehow... and uses it to stiffen up that big hole... maybe it'll end up stronger...

I don't know , and wouldn't judge it til it was DONE...

                                          Gotta Fly...
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It seems that guy understands a little at all what`s he doing :?

Re: Wing Tanks

PostPosted: Fri Jun 12, 2009 12:22 pm
by aerodesign
planecrazzzy wrote:I don't see how you could say anything.... it's not finished... How do you know what it'll end up like ???

If he ties that tank in somehow... and uses it to stiffen up that big hole... maybe it'll end up stronger...

I don't know , and wouldn't judge it til it was DONE...

                                          Gotta Fly...

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Mike, to tie the tank is not an issue. The main thing here: the wing spars are  NOT calculated for increased inertia loads (imagine 25 gal each, instead of 5 in wing tanks), the wing spars are not calculated for the increased distributed loads.... so, wing  design load has changed and hence unknown. Destructive loads and all the limits became unknown... I would not be able to accept such risk.

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PostPosted: Fri Jun 12, 2009 1:15 pm
by planecrazzzy
Ok , I see what your saying... Even if he does "tie it in" good ... still not good...

 Seems to me... if he "does tie it in good... it would "carry" the load from the spars , rather than adding to their load...

So the only weak point would be the inboard part of the spar ?

                                  Gotta Fly...
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Re: ...

PostPosted: Fri Jun 12, 2009 1:46 pm
by aerodesign
planecrazzzy wrote:Ok , I see what your saying... Even if he does "tie it in" good ... still not good...

 Seems to me... if he "does tie it in good... it would "carry" the load from the spars , rather than adding to their load...

So the only weak point would be the inboard part of the spar ?

                                  Gotta Fly...
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Inboard and outbaird part of the spars (due an increased distributed loads), struts and their attachments are  calculated under different loads and limits.
And definitely impact will take a place for a whole wing structure because of increased summarized distributed loads. All these changes will cause
different behaviour of the whole airplane.

PostPosted: Fri Jun 12, 2009 2:14 pm
by planecrazzzy
Yeah, if ya ask me... that's just too much fuel.... I gotta get out and stretch or take a leak....

   The Stock fuel supply is good enough for me.... around 4 hrs flying time ???  Yeah , THAT'S too much...

                                        Gotta Fly...
                                                         Mike & "Jaz" the Flying Dog
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PostPosted: Fri Jun 12, 2009 2:17 pm
by aerodesign
planecrazzzy wrote:Yeah, if ya ask me... that's just too much fuel.... I gotta get out and stretch or take a leak....

   The Stock fuel supply is good enough for me.... around 4 hrs flying time ???  Yeah , THAT'S too much...

                                        Gotta Fly...
                                                         Mike & "Jaz" the Flying Dog
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Sure, will not ever  find such bladder to tolearate these tanks till empty :D  :D  :D

PostPosted: Tue Jul 14, 2009 12:14 pm
by Aerco
Unless that tank is strong enough to handle air loads and can transfer those air loads into the spars efficiently, that is a disaster waiting to happen.  Wing ribs have a function - you cannot simply delete most of them and count on the skins alone to transfer loads to the spars. Plus the skins would have nothing to stabilize them and buckle all over the place at the lightest of loads. This is not a well-thought out idea.

WTF?

PostPosted: Tue Jul 14, 2009 12:20 pm
by planecrazzzy
Ah.... So you think he was Finished at this stage...... I see...

                                                           Gotta Fly...


PS  Go on the Tailwind Forum at Yahoo and talk to the guy....
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Aerco wrote:Unless that tank is strong enough to handle air loads and can transfer those air loads into the spars efficiently, that is a disaster waiting to happen.  Wing ribs have a function - you cannot simply delete most of them and count on the skins alone to transfer loads to the spars. Plus the skins would have nothing to stabilize them and buckle all over the place at the lightest of loads. This is not a well-thought out idea.

PostPosted: Fri Jul 17, 2009 12:54 pm
by gerryvandyk
Where in heaven's name is all your negativity coming from?  Solving the 'problems' you cite are truely trivial.

Build a tank baffle in at each rib location (wing rib inside the tank instead of outside), add a cap strip outside the tank to take the sheeting.  If the tank is build accurately to the rib shape just glue the sheeting direct to the tank skin.

As for the spar, the 1-1/4" x 5" deep douglas fir spar is ludicrously overbuilt in the first place.

This is Jim Rust's tailwind, he works for Whirlwind Propellers and he's no dummy.  I believe he's been flying it for some years now.

Regards
Gerry

Aerco wrote:Unless that tank is strong enough to handle air loads and can transfer those air loads into the spars efficiently, that is a disaster waiting to happen.  Wing ribs have a function - you cannot simply delete most of them and count on the skins alone to transfer loads to the spars. Plus the skins would have nothing to stabilize them and buckle all over the place at the lightest of loads. This is not a well-thought out idea.

fuel tanks in wood wings on GP-4

PostPosted: Fri Jul 31, 2009 12:25 pm
by nadt770
The GP-4 has glass tanks incorporated in the leading edge of the wing. It does have a massive spar though and there are no tanks between the main spar and rear spar.