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01-19-2011, 11:44 AM
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Join Date: Dec 2004
Location: Gold Hill, NC25
Posts: 2,400
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Quote:
Originally Posted by rvmills
Me too (looked on your web site for it...still trying not to pester...will the questions never end?  ) Smell...pun intended...like another thread?
Cheers,
Bob
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Bob your killing me!
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Kahuna
6A, S8 ,
Gold Hill, NC25
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01-19-2011, 03:11 PM
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Join Date: Dec 2008
Location: Redmond, WA
Posts: 269
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There seems to be huge interest in this topic, given all the threads. I am also planning to add tanks to my 9.
Doug, would it make sense to start a new forum section on Long Range RVs, or some similar title?
__________________
-- Mike Culver;
RV-9 project sold  but details of the build at
www.mculver.com
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01-21-2011, 07:17 AM
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Join Date: Jan 2007
Location: Bara, Sweden
Posts: 9
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Hello Kahuna,
Are you in for one more question? How did you route the outboard tank vent line to the fuselage?
Thanks,
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01-21-2011, 08:21 AM
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Join Date: Dec 2004
Location: Gold Hill, NC25
Posts: 2,400
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Quote:
Originally Posted by ScaniaRV
Hello Kahuna,
Are you in for one more question? How did you route the outboard tank vent line to the fuselage?
Thanks,
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Like a stardard tank, except... Normally the vent line terminiates near the filler open to the inside of the tank. Mine terminates in the inboard tank to a bulkhead fitting on the inboard tank outboard rib. Then though a line into the outboard tank, then near the filler cap of the outboard tank its open there.
So essentially the vent line passes through the inboard tank for convenience routing only.
__________________
Kahuna
6A, S8 ,
Gold Hill, NC25
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01-21-2011, 08:54 AM
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Join Date: Aug 2006
Location: Taylor Texas
Posts: 811
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There ain't no free lunch
Hey Mike:
I am told buy an ex-Quantas 747 Captain that you should figure it's gonna take 10% of you fuel to carry the fuel. In other words, if you are loaded with 90 gals, 9 of those will be used to simply carry the 90 gals along. This gives you 81 to use the in equations for range/endurance. I figure this fella had a bit of experience with long range planning, so I listened.
That is a nifty transfer system - no electric doo-dads to screw up & leave you dragging around a lot of useless weight. I like it!
Carry on!
Mark
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01-21-2011, 09:15 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,145
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Quote:
Originally Posted by F1Boss
Hey Mike:
I am told buy an ex-Quantas 747 Captain that you should figure it's gonna take 10% of you fuel to carry the fuel. In other words, if you are loaded with 90 gals, 9 of those will be used to simply carry the 90 gals along. This gives you 81 to use the in equations for range/endurance. I figure this fella had a bit of experience with long range planning, so I listened.
That is a nifty transfer system - no electric doo-dads to screw up & leave you dragging around a lot of useless weight. I like it!
Carry on!
Mark
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Experience in the 747, yes - but that does not transfer apples-to-apples to other aircraft. The induced drag from the wings is a direct product of total weight supported by the wing, and the portion of that weight (and induced drag) that can be attributed to the excess fuel is the percentage of excess fuel weight to total aircraft weight. His excess fuel load represents a much larger percentage of total aircraft weight than does ours.
Will we burn more fuel to carry our fuel? Certainly - but I don't think 10% is an accurate figure. If you look at Van's numbers for solo weight versus max gross weight, you will see that the Vans design does not lose much speed with that moderate weight gain. I would be surprised if we lose as much as 2%.
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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