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Long range fuel for the "9"

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

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
Guest

Posted: Sun Dec 02, 2007 4:31 pm Post subject: Long range fuel for the "9"

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
Guest

Posted: Mon Dec 03, 2007 11:52 am Post subject: Long range fuel for the "9"

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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