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  #1  
Old 09-23-2018, 01:13 PM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
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Default Filling stall Warning Holes

How did you guys fill the holes in the leading edge for the stall warning device?

I don't have access to the backside of the skin. When filling a hole like this, I like to get a bit of build up to hold the filler in place. If I press it in from the front, there is little likelihood of it hitting the backside of the skin. That leaves me with only .032" of adhesion.

I don't want to pull the fuel tank to get access. These are QB wings.

Larry
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  #2  
Old 09-23-2018, 01:36 PM
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Plummit Plummit is online now
 
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Mine were just left open Larry. I also have an AOA that has a hole in the top of the wing. No big deal, but if you really didn't want the holes now is the time to fill them.

-Marc
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  #3  
Old 09-23-2018, 01:36 PM
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ERushing ERushing is offline
 
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Location: Underwood, WA
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Default Pull the tank

I pulled the tanks to leak test them off the wing anyway. Actually, I pulled the tank twice because the first time I forgot to fill the leading edge holes!

It’s really not that big of a deal.
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  #4  
Old 09-23-2018, 01:50 PM
togaflyer togaflyer is offline
 
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JB Weld epoxy. Quick set.
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  #5  
Old 09-23-2018, 05:41 PM
DRMA DRMA is offline
 
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Location: Sugar Land, TX
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I didn't want to pull the tanks either, but decided that it was what needed to be done. Once I started, pulling the tanks wasn't that hard. It took perhaps 30 - 40 minutes per tank to remove and replace them. Then just inserted the rivets to fill the holes per the plans.

Better to remove the tanks now, before they are closed up and installed, then try to fill the holes with some type of mastic and find you need to pull the tanks to do it right 6 months after first flight.

Cheers,
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  #6  
Old 09-24-2018, 06:44 AM
Scott Hersha Scott Hersha is offline
 
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Location: Cincinnati, OH
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My QB wings had an inspection plate on the bottom for access to the back side of the holes for stall warning install. If you end up taking off your wings to gain backside access, this is what I did on mine - rough up the skin a little on the inside with some 80 grit, lay a layer of wetted out fiberglass cloth over that area, and then on the outside squeegee on some epoxy/flox over the hole and into the wet cloth. Let it cure, sand to flush, and smooth with epoxy micro paste or metal glaze. sand to 600 grit wet and you'll never see it when painted.
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  #7  
Old 09-24-2018, 07:42 AM
rockwoodrv9 rockwoodrv9 is offline
 
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Location: Meridian ID, Aspen CO
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Is it possible to 3d print a plug that could pop in? You my have to force it a bit.

Since the only knowledge I have of 3d printing is reading Steve's thread, this idea may be nuts. I doubt all the holes are exactly the same size so probably couldnt mass produce them unless they were made a bit bigger and people modified the hole to fit the plug. Just an idea.
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  #8  
Old 09-24-2018, 09:56 AM
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flion flion is offline
 
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If you REALLY don't want to pull the tanks you could use a pulled rivet. Personally, I think it'd be a bigger hassle to get the rivets from ACS and you'll feel kind of silly once you pull the tanks anyway for some other reason. Plus, even when filled, it won't look as nice as solid rivets.
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  #9  
Old 09-24-2018, 11:10 AM
lr172 lr172 is offline
 
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Thanks for the input. I think that I will try some liquid JB weld. If I push it up in there while in the wing cradle, gravity should coat the backside and make it strong enough. I was thinking filler and not something more liquid.

Larry
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  #10  
Old 09-24-2018, 11:26 AM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
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Default Yeah...

The issue with filling the hole with rivets is that it is a curved surface. The rivets will give you a flat spot in the curve. Ask me how I know...
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