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  #1  
Old 10-09-2018, 03:13 PM
77bonanza 77bonanza is offline
 
Join Date: Jan 2016
Location: Gravois Mills, MO
Posts: 13
Default QB Wing Tanks

First of all let me qualify that I am a first time builder and will ask stupid questions.

I have QB wings. I have seen where many builders are removing the tanks and doing leak tests. Is this necessary? They come from Van's installed and tested. Why not just test for leaks with them in the wing and if none are found you do not have to remove the tank. If you do have a leak then remove the tank and investigate further. I know I am oversimplifying this and am asking for guidance as to how I should proceed.

Thanks and thoughts?
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  #2  
Old 10-09-2018, 04:01 PM
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N804RV N804RV is offline
 
Join Date: May 2013
Location: Mount Vernon, Wa
Posts: 387
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Why would you not? I wouldn't assume anything about quick build. Take the tanks off, visual inspect as much of the tanks and the wings as you can. Do the leak test on each tank. Then, put it all back together, leaving nothing to chance. -JMHO!
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  #3  
Old 10-09-2018, 04:06 PM
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RONSIM RONSIM is offline
 
Join Date: Feb 2008
Location: Largo, FL
Posts: 850
Default Leave them alone

The tanks on our -10 were just fine ---- if it were me, fly the plane unpainted the first several hours ---- work all the bugs out and, if a leak develops, then remove and fix --- chances are they will be just fine.

Ron
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  #4  
Old 10-09-2018, 04:19 PM
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bkervaski bkervaski is online now
 
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Location: Birmingham, Alabama
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So far so good on my QB 14 tanks .. no leaks .. (knocking on wood)
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  #5  
Old 10-09-2018, 05:10 PM
Discus2b Discus2b is offline
 
Join Date: Mar 2016
Location: Willis Gliderport
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No leaks on mine.
H
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  #6  
Old 10-09-2018, 05:44 PM
Jake14 Jake14 is offline
 
Join Date: May 2014
Location: Seattle
Posts: 191
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Had a vent tube leak on the left QB tank

http://www.vansairforce.com/communit...d.php?t=151951

Now 1 yr later, the right QB tank vent has a slow drip.....

These vent leaks can't easily be tested with the tanks on or off the plane, just have to wait and see if it happens

I would just do the standard leak testing with the tanks in place before mounting the wings. Not really much of interest to see by removing the tanks...
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  #7  
Old 10-09-2018, 05:58 PM
MElstien MElstien is offline
 
Join Date: Jan 2013
Location: Kinnelon NJ
Posts: 111
Default Leak Testing

Hello,

RV-10 builder but I think RV-14 is very similar

Leak testing the tanks can be done with the tanks installed but you will not be able to see identify any leaks on the baffle side of the tank or the outboard most rib side.

My suggestion, take them off and test completely. My QB tanks were fine. It also gets you familiar with the process and requires you to check the torque on the screws.
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  #8  
Old 10-09-2018, 06:14 PM
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czechsix czechsix is offline
 
Join Date: Mar 2006
Location: Spring Hill, KS
Posts: 336
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If they were my QB wings I'd simply test the tanks installed on the wings with a water manometer (just like I did with the tanks I built for both my RV-8 and -14). No need to remove them from the wing unless there's a leak and you can't find it on the outside anywhere...then you'd need to pull the tank off the wing to fix a leak on the aft baffle.

There are other threads about various ways to do leak checks...some people don't like the manometer method because the level will fluctuate with changing atmospheric pressure. This is true, but I left the manometer installed for over a week on each tank...while the level fluctuates a bit, eventually if there's a leak the 'average' water level will drop to the neutral point. The hardest part about leak checks in my experience is sealing the filler opening. I found some 4" wide vinyl tape online so I could completely cover the opening with one piece and that did the trick.

Good luck,
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  #9  
Old 10-09-2018, 06:33 PM
mturnerb mturnerb is offline
 
Join Date: Apr 2015
Location: Ponte Vedra, FL
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For me the main reason to remove them was the installation of fuel senders: the easiest way to test the fit of the bends in sender arms was to repeatedly flip tank over - not possible when on wing/stand and very difficult to manipulate the sender arms otherwise.
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  #10  
Old 10-09-2018, 06:36 PM
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Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,783
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No leak test will find the “weeping rivet”.

I put the tanks on the bench and put 5-10 gallons of 100LL in each. I let them sit for a few months in various postions looking for any telltale blue stains.

Carl
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