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  #21  
Old 01-19-2011, 11:44 AM
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Kahuna Kahuna is offline
 
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Originally Posted by rvmills View Post
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
Bob your killing me!
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  #22  
Old 01-19-2011, 03:11 PM
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mculver mculver is offline
 
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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?
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  #23  
Old 01-21-2011, 07:17 AM
ScaniaRV ScaniaRV is offline
 
Join Date: Jan 2007
Location: Bara, Sweden
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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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  #24  
Old 01-21-2011, 08:21 AM
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Kahuna Kahuna is offline
 
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Originally Posted by ScaniaRV View Post
Hello Kahuna,
Are you in for one more question? How did you route the outboard tank vent line to the fuselage?
Thanks,
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.
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  #25  
Old 01-21-2011, 08:54 AM
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F1Boss F1Boss is offline
 
Join Date: Aug 2006
Location: Taylor Texas
Posts: 811
Default 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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  #26  
Old 01-21-2011, 09:15 AM
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airguy airguy is offline
 
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Location: Garden City, Tx
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Originally Posted by F1Boss View Post
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
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%.
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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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