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Fuel Tank & Wing Spar Problems

 
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mgvalentine(at)gmail.com
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PostPosted: Mon Jan 02, 2006 6:50 pm    Post subject: Fuel Tank & Wing Spar Problems Reply with quote


Listers, I have a somewhat in-depth problem that I would like your
suggestions on. This will take a bit of time, so skip this post right
now if you aren't interested in getting deeply involved - believe me,
I understand! (FWIW, I have also sent this inquiry to the factory
because I didn't understand the phone discussion I had with
Sebastian).
I ordered the LR tanks on my complete 601XL kit. But, before my kit
shipped, I was lucky (?) enough to pick up another builder's wing kit
because he was forced to quit his project. He was doing the auxiliary
tanks and had everything necessary for that set-up. He had not even
begun working on his wing, though, and everything was untouched.
Zenith was nice enough to deduct the wing kit from my order and just
ship me the rest - shipping later this month.
I would strongly prefer LR fuel tanks. Standard tanks are bit small
(planning Corvair engine), and I don't want to do the extra plumbing
(or, more importantly, risk forgetting to switch tanks) that comes
with the auxiliary tanks. However, his wing spar was built for the
auxiliary tanks, and I don't know how, or if, I should modify it for
the LR tanks.
Here is what I have - you can follow along on 6-W-3. I have also
posted the relevant picture at
http://websites.expercraft.com/vwkismet/index.php?q=log entry&log id=8321
Two nose rib flanges at 1510 and 1550. One hat stiffener with the
first row of holes at 1750. No row of holes at 2010 (and, very
importantly, the solid rivets do not line up with 2010 at all - see
dashed line in picture).
If I were doing the LR tanks, there should be a hat stiffener at
1510-1550; a nose rib flange at 1750; no holes at 1790 (the second row
of holes for the existing hat stiffener); and, a row of holes at 2010
for the next nose rib.
I don't have the tools to install solid rivets, so if I drill any out,
I will need to do something else. (Sebastian mentioned AN3 bolts.)
The simplest approach that gets me the LR tanks (without having Zenith
just make me new ones) seems to be: drill out nose rib flanges at
1510/1550 and install hat stiffener (use AN3 bolts for solid rivets);
drill out inboard 1/2 of hat stiffener at 1750, leave outboard half,
install nose rib flange, use AN3 bolts for solid rivets; and install
nose rib flange near 2010 (assuming here that it is not necessary to
be exact, I could install it just shy of 2010 by drilling out top and
bottom solid rivets).
So, what do you think. Should I make changes? Any and all suggestions welcome.
Thanks, Michael Valentine
If you have any in-depth responses, please contact me off list.


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zodierocket(at)hsfx.ca
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PostPosted: Mon Jan 02, 2006 7:20 pm    Post subject: Fuel Tank & Wing Spar Problems Reply with quote


Wow, this is a good one. I have a couple of other suggestions. You have
the spar that was made prior to the advent of the larger 15 gal tanks so
no provision was made for these. IF you in fact have the 4 12 gal tanks
then you can do one of two things if you are wary of the 5 way fuel
selector.
1) (which I would not recommend personally) would be to install all 4
tanks and plumb 2 3/8ths line between the inboard and outboard tanks
this would gravity feed fuel from the outboard The inboard vent would
need to be plugged and the two lines be set one low for fuel and one
high for venting between the tanks.
2) install all 4 tanks, use a low pressure pump in each wing to transfer
fuel from outboard tanks to inboard tanks and only use inboard tanks for
flight. This allows you to only fill the outboard tanks when you have
both useful load in which to carry the extra fuel and a need to do so.
IT does add to the cost with two more pumps and fuel gauges but it is a
simplicity that isn't going to make your big fan go quite if it doesn't
work. You will never depend on them, as they are only there for
convenience.
I personally would not hesitate to change the spar, but I have all the
tools and being a plans builder I also have intimate knowledge and
sklill on Zenith spars. For someone who does not have the skill they
would be a costly place to learn. Also I couldn't hide the holes in my
nose skin if I switched to the larger tanks. So I have 4 12 gal in my
wings.
Mark Townsend Alma, Ontario
Zodiac 601XL C-GOXL, CH701 just started
www.ch601.org / www.ch701.com / www.Osprey2.com


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p.mulwitz(at)worldnet.att
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PostPosted: Mon Jan 02, 2006 7:35 pm    Post subject: Fuel Tank & Wing Spar Problems Reply with quote


Based on my experience, if you ever get Sebastian on the phone the
only appropriate question to ask is: Is Nick there?
Paul
XL wings
do not archive or quote in the vicinity of Mexico, MO
At 06:49 PM 1/2/2006, you wrote:
Quote:
(FWIW, I have also sent this inquiry to the factory
because I didn't understand the phone discussion I had with
Sebastian).

---------------------------------------------
Paul Mulwitz
32013 NE Dial Road
Camas, WA 98607
---------------------------------------------


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moorecomp(at)yahoo.com
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PostPosted: Mon Jan 02, 2006 9:47 pm    Post subject: Fuel Tank & Wing Spar Problems Reply with quote


Michael,
I do not know where you are located, but chances are
good that there is an EAA chapter near you. This is
the kind of thing that could be taken care of rather
quickly by making some local contacts. Someone is
bound to have the riveting tools to do this correctly.
Go to eaa.org and locate a chapter near you.
Craig Moore
A&P and 701 builder wannabe
--- Michael Valentine <mgvalentine(at)gmail.com> wrote:
<mgvalentine(at)gmail.com>


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