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Long range fuel for the "9"

 
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rv9jim(at)juno.com
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PostPosted: Sun Dec 02, 2007 2:25 pm    Post subject: Long range fuel for the "9" Reply with quote

Carlos,
The reason Safe-Air does not have a long range set up for the "9"
is the size of the lightning holes in the wing. The availability of
"standard" size aluminum tubing and the holes in the wings do not get
together. I looked at doing the job myself but with a good look at the
availability of aluminum tubing, it could not come together. So, I
decided that if I really wanted to extend the range of my "9" I would do
an internal tank. It would set behind the pilot and with a separate pump
to put fuel into the fuel line for the left tank (while running on the
right tank). An appropriate check valve and a quick disconnect rounds
out the stuff. I would fill the tank with it installed inside the
fuselage. Not the best way but doable. I figured having about 7 -8 gal
extra would give me 550 to 600 naut. miles between refueling and still
have about 30 min fuel for minimums.
After all the figuring, the limiting factor was my bladder.
3-3.5 hours of flight time and I'm ready to get out and stretch a bit.
Getting older is a bummer. But then again, beats the alternative.
Jim


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trigo(at)mail.telepac.pt
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PostPosted: Sun Dec 02, 2007 4:31 pm    Post subject: Long range fuel for the "9" Reply with quote

Jim

Thanks for your answer. I never thought that could be the reason. Can you
elaborate a little more on that subject? For example, which is difference in
the diameters of the lightening holes from the -9 to the -7 or the -10? And
what about the standard diameters of available aluminium tubes? Which is the
external diameter of the tanks they produce?

Carlos

[quote] --


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rv9jim(at)juno.com
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PostPosted: Mon Dec 03, 2007 11:52 am    Post subject: Long range fuel for the "9" Reply with quote

Hi Carlos,
I do not know the size of the holes in the "7" wing but my
"metals" catalog which shows me all the types and sizes available shows
an aluminum tube in 6061-T6. This is the only "drawn seamless tubing
large enough to be used for an extended range tank in our wings the way
Safe-Air does them. Industry standards have available 3", 3-1/2", and
4" O.D. tubing. I don't remember the hole size in the wings, but there
was no room to slide the tube into the wing. If you look at the pix of
the "7" wing tubes, they are supported with tabs that attach to the ribs.
There is no room for the "9" wings to slide the tube into and to utilize
the tab mounting. The tube is just a bit to large. You could go into
the wing, if you are building the wings, and enlarge the hole to accept
the standard tube size. Again, not an easy task. I bought quick built
wings and I figured that the effort was not worth the additional work.
The interior tank was a much more acceptable method of getting additional
fuel. Plus, I could remove the tank if I did not need it. As I said, I
decided that the additional fuel was not in my cards. My travels run
about 550 NM. Just enough distance to require one refueling. Of
course, that is in a NW direction which is against the prevailing winds
so my cruising distance with a minimum of 30 to 45 min. comes up short
with the standard tanks. Oh well, a break for potty and fuel is ok.
Jim


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