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Fuel vents

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john(at)fureychrysler.com
Guest

Posted: Thu Nov 30, 2006 9:13 am Post subject: Fuel vents

I saw that someone  had recommended keeping the fuel tank vent in the wing root by winding a  couple turns of the tubing and exiting the lower intersection fairing thereby  not having to enter the cockpit and do all that plumbing. Anyone with experience  on this???

  

 Thanks

 John  Furey

 RV7  QB

   [quote][b]

walter(at)tondu.com
Guest

Posted: Thu Nov 30, 2006 9:47 am Post subject: Fuel vents

On 11/30 12:13, John Furey wrote:



 >    I saw that someone had recommended keeping the fuel tank vent in the wing

 >    root by winding a couple turns of the tubing and exiting the lower

 >    intersection fairing thereby not having to enter the cockpit and do all

 >    that plumbing. Anyone with experience on this???



I believe this is commonly done on Rockets.  You might check that

list if you don't get info here.    



-- 

Walter Tondu

http://www.rv7-a.com - Flying!

http://www.evorocket.com - Building

gilbey(at)earthlink.net
Guest

Posted: Thu Nov 30, 2006 10:25 am Post subject: Fuel vents

john.i did what you are talking about also a friend  did the same in his 6,i have a 6a and he has the 6,we both used three turns or  coils in the wing root,large coils,to just where they will fit inside the root  with fairing covering them,ty them together with nyon tys and secure them to  keep viberation down,drill a hole in the wing fairing and run the drain out the  bottom, no problem with this so far with either of us,ymmv for whats its  worth,

 frank goggio    rv6a

    [quote][b]

lhelming(at)sigecom.net
Guest

Posted: Thu Nov 30, 2006 2:23 pm Post subject: Fuel vents

In making a change in the design of the vent as  described, I wonder if that would be an issue with insurance coverage or with a  future buyer of the plane if it came to be a problem contributor and it wasn't  disclosed beforehand?    I just did not see the present design being a  problem with installing it per the plans and the revision does not appear  to improve the performance, so what is the purpose of changing Van's  design?   

 [quote]   ---

kboatright1(at)comcast.ne
Guest

Posted: Thu Nov 30, 2006 3:59 pm Post subject: Fuel vents

Once the policy is written, you're covered as long  as you didn't intentionally misrepresent your aircraft. There are variations  from Van's standards on every aircraft, whether the variations are gross weight  limits, an extra rivet here or there, or (heaven forbid) another solution to the  fuel vent installation. 

 As far as liability goes, as the builder, you have  the risk of being sued if the airplane ever crashes, regardless of whether the  airplane was built exactly to plan or not.

  

 As long as the system works, and it is up to the  builder to determine if it works, the liability and insurance problems are no  better or worse than with any other RV.

  

 KB

 [quote]   ---

n616tb(at)btsapps.com
Guest

Posted: Thu Nov 30, 2006 6:42 pm Post subject: Fuel vents

Well, if it works then it works.  My question would be how to keep fuel out of the vent line.  With the stock design, if you bank steep or do aerobatics will fuel enter the vent and then run back to the tank because of the height in the vent?  With coils could you get fuel in the coil and have it not run back thereby blocking the vent?  Just a question, but sounds like a reasonable thing to do.  Fuel inside is almost unavoidable with the valve design.  

   

Tim  

           

  

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of hangerq

 Sent: Thursday, November 30, 2006 11:56 AM

 To: rv-list(at)matronics.com

 Subject: Re: Fuel vents  

  

     

john.i did what you are talking about also a friend did the same in his 6,i have a 6a and he has the 6,we both used three turns or coils in the wing root,large coils,to just where they will fit inside the root with fairing covering them,ty them together with nyon tys and secure them to keep viberation down,drill a hole in the wing fairing and run the drain out the bottom, no problem with this so far with either of us,ymmv for whats its worth,  

    

frank goggio   rv6a  

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        [quote][b]

frank goggio

Joined: 10 Jan 2006
Posts: 5
Location: fayetteville N.C.

Posted: Thu Nov 30, 2006 7:42 pm Post subject: Fuel vents

tim.all i can tell you on the coils for  vents is that they work,i have a small bevel cut slanted to the front and  the air pressure seems to keep excess fuel from leaking out,as far as aerobatics  are concerned,the test pilot that did the test flight on mine,did all the  positive  stuff that he could think off,some on the first flight,and a lot  on the second flight,never a problem,the only time i see fuel leaking out is  when i leave it to full of fuel,i may be speaking out of turn,but i believe my  friend spoke to someone at vans about this, and was told it was ok,unless i was  dreaming this,sure was a lot easier to install then the plans drawing,works for  me,

 frank goggio  rv6a

 do not archive

    [quote][b]

Dennis Glaeser

Joined: 10 Jan 2006
Posts: 53
Location: Rochester Hills, Michigan

Posted: Thu Nov 30, 2006 8:26 pm Post subject: Fuel vents

Remember that the engine is (hopefully) constantly drawing fuel from the

tank, and the air to replace the fuel comes in through the vent.  So as long

as the engine is running, there is a constant flow of air into the tank

through the vent.

Fuel doesn't flow out the vent from the unused tank even during maneuvers

because it is (again, hopefully) sealed and there is no air coming in to

allow the fuel to flow out the vent - similar to dipping a tube into liquid,

then holding your finger over the end and pulling it out.

Fuel can not 'block' the vent, it just flows in or out depending on the

relative pressure inside the tank vs. outside air pressure.  The loops in

the Rocket style vent are there so that, under normal circumstances, there

is not enough fuel in the line to over-fill it, and spill fuel overboard.



Dennis Glaeser

RV-7A - wiring my panel, waiting for my Eggenfeller H6 - wings have the

Rocket style vents installed.



----------------------------------------------------------------------------

-----------------------

From:      Tim Bryan (n616tb(at)btsapps.com)



Well, if it works then it works.  My question would be how to keep fuel out

of the vent line.  With the stock design, if you bank steep or do aerobatics

will fuel enter the vent and then run back to the tank because of the height

in the vent?  With coils could you get fuel in the coil and have it not run

back thereby blocking the vent?  Just a question, but sounds like a

reasonable thing to do.  Fuel inside is almost unavoidable with the valve

design.



Tim

rickgray(at)roadrunner.co
Guest

Posted: Fri Dec 01, 2006 4:17 am Post subject: Fuel vents

Yo' Crossfire, 

 This is the vent line you're talking about....Randy Planzer did  this on his F1 Rocket....pic from his site:

  

 http://tinyurl.com/yj3v5d

  

 Rick in Ohio at the Buffalo Farm

 http://rv6rick.tripod.com/ohiovalleyrvators/

 [quote]   ---

tcervin(at)valkyrie.net
Guest

Posted: Fri Dec 01, 2006 7:24 am Post subject: Fuel vents

Rick, That looks like a great idea! I have had problems on hot  days with the vents on my RV6-A spitting fuel. Wonder if the loops of line in  the wing root area would allow more expansion before starting to  spit....spit?

                                                                                                                                                  Tom in Ohio (10G)

  

 [quote]   ---

rickgray(at)roadrunner.co
Guest

Posted: Sat Dec 02, 2006 6:04 pm Post subject: Fuel vents

I dunno but I'm planning on trying  it!

 Rick

 [quote]   ---

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