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10-30-2011, 07:01 AM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Quote:
Originally Posted by DAGO
Larry,
I don’t know anything about -10 construction, however, would this trouble shooting procedure work??? Connect some plastic tubing to the end of each fuel vent. Run each line of tubing down the fuselage centerline and past the trailing edge of the wing. Mount the tubing with speed tape or equivalent. Conduct a test flight.
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That is an interesting test. Thanks.
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
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10-30-2011, 09:47 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Quote:
Originally Posted by DAGO
Larry,
I don?t know anything about -10 construction, however, would this trouble shooting procedure work??? Connect some plastic tubing to the end of each fuel vent. Run each line of tubing down the fuselage centerline and past the trailing edge of the wing. Mount the tubing with speed tape or equivalent. Conduct a test flight.
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If you do this, keep in mind the stock fuel vent has a slash cut to face into the airstream, thus creating a slight pressure in the vent line.
Tubing taped to the fuse C/L could easily create a low pressure in the tubing, depending on how the end of the tube is facing.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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11-03-2011, 11:19 AM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Quote:
Originally Posted by Mike S
If you do this, keep in mind the stock fuel vent has a slash cut to face into the airstream, thus creating a slight pressure in the vent line.
Tubing taped to the fuse C/L could easily create a low pressure in the tubing, depending on how the end of the tube is facing.
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Good point.
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
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11-03-2011, 03:33 PM
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Join Date: Feb 2006
Posts: 276
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I have this issue on my RV-10
Typically smell it when the tanks are very fully and I am turning and descending at the same time (ie base to final).
Definitely related to how much fuel is in the tanks since it only happens with full tanks.
__________________
Bruce
Richmond, VA (KFCI)
RV-10 (520+ hours since first flight in Nov 07)
RV-8 (500 hours, sold Sept 07)
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02-12-2012, 10:04 AM
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Join Date: Oct 2005
Posts: 1,516
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Fuel smell
Has anyone found a cure for the fuel smell on landing?
About 33 hours into phase one, I have noticed the fuel smell upon entering the pattern most of the time. It is very faint and mostly with the tanks near full.
Glad I new about it from this thread as it was somewhat disconcerting
when I got my first whiff of fuel while landing.
__________________
Ernst Freitag
RV-8 finished (sold)
RV-10 Flyer 600 plus hours
Running on E10 mogas
Don't believe everything you know.
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02-12-2012, 05:38 PM
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Join Date: Apr 2009
Location: USA
Posts: 1,499
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No fuel smell on mine
I have tested uncoordinated/steep turns and -.5 G's with 25+ gallons fuel.
I have sealed spar pass throughs with foil tape. Sealed aileron pushrod with Abby's boots. Prosealed bottom skin to side skin joint. Prosealed bottom wing root fairing, as it does not need to be removed for inspections. Prosealed around snap bushing at vents.
Cabin is always under negative pressure unless front and rear vents are wide open on mine. Any fuel leaks from firewall to tanks will end up in the cabin.
__________________
Good judgment comes from experience, and a lot of that comes from bad judgment.
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02-12-2012, 05:58 PM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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I can't help but think this contributed to Todd's incident.
Sure would be nice to find a cure.
Ideas -10 drivers?
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
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02-12-2012, 06:40 PM
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Join Date: Sep 2009
Location: St. Louis, MO
Posts: 1,788
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As Wayne stated, the cabin has negative pressure and will suck anything inside that is close, such a raw gas and fumes. Maybe the vents need to be relocated outboard of the tank. That's where they are on my Archer. Alternatively, extending the vent into the slipstream more by extending them an inch or so may help.
Those who notice this problem report it when turning or descending, could this imply that the vent pickup is to low in the tank and is easily submersed? I purchased the QB wings, so I am not intimately familiar with the placement, or the builders flexibility with the placement of the vent inside the tank.
Has anyone with this issue spoken to Vans?
__________________
Bill Peyton
RV-10 - 1125 hrs
N37CP
First Flight Oct 2012
Aviation Partners, LLC
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02-12-2012, 09:03 PM
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Join Date: Apr 2009
Location: USA
Posts: 1,499
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I ran my 1/4" vent as close to top of tank as possible by putting a bend in the end. If my tanks over flow from expansion you don't want to remove caps as the fuel is near the outside of filler necks. Just drain a little from quick drains.
I think with tubing running from outboard to inboard this helps keep fuel in the tank during a slipping or skidding turns. If the vent was exiting outboard more fuel would be lost during slipping turns, but it would exit at a more favorable location. I like the idea of extending it another inch.
With all of the precautions I have taken after hearing of this problem not just with the -10, I have no fuel vapors entering the cabin. I also ran my combustible gas leak detector during initial test flights.
__________________
Good judgment comes from experience, and a lot of that comes from bad judgment.
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02-12-2012, 10:26 PM
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Join Date: Oct 2005
Posts: 1,516
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I can only suspect the vents since I have no fuel leaks anywhere.
Happens with full tanks only.
Taping all the openings seems like a good fix.
Relocating the vents would be a true solution.
Maybe route them outboard to the first inboard inspection bay?
Don't want to make my passengers nervous.
Flew 3 hours today and returned to the airport with 10 gallons total, no smell. 
__________________
Ernst Freitag
RV-8 finished (sold)
RV-10 Flyer 600 plus hours
Running on E10 mogas
Don't believe everything you know.
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