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  #1  
Old 11-26-2022, 09:45 AM
Webb's Avatar
Webb Webb is offline
 
Join Date: Oct 2007
Location: Jackson, MS
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Default Aft flap skin - RV-8

The bottom aft flap skin looks like the wind would catch and lift it which could potentially bend the skin.

Plans show no rivet near edge to prevent wind from lifting the skin. Iím getting ready to mix some Proseal for another use and while I have a batched mixed, why not glue the skins together so the wind canít lift it.

Is this the way to go or is there something better to do?
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  #2  
Old 11-26-2022, 09:58 AM
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bjdecker bjdecker is offline
 
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Quote:
Originally Posted by Webb View Post
The bottom aft flap skin looks like the wind would catch and lift it which could potentially bend the skin.

Plans show no rivet near edge to prevent wind from lifting the skin. Iím getting ready to mix some Proseal for another use and while I have a batched mixed, why not glue the skins together so the wind canít lift it.

Is this the way to go or is there something better to do?
Or just follow the assembly instructions and not try to fix a problem that doesn't exist.
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  #3  
Old 11-26-2022, 10:29 AM
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Ironflight Ironflight is offline
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Quote:
Originally Posted by bjdecker View Post
Or just follow the assembly instructions and not try to fix a problem that doesn't exist.
Yup - 1612 RV-8ís flying, and I have never heard of anyone with a problem with the flap designÖ..
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  #4  
Old 11-26-2022, 11:21 AM
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Quote:
Originally Posted by Ironflight View Post
Yup - 1612 RV-8’s flying, and I have never heard of anyone with a problem with the flap design…..
However, I would change the flap push rods to the hexagonal version used in the RV-9. Also use a CM-4M rod end bearing with appropriate bolts/washers instead of the CM-4S. I also might consider changing out the hinge type to MS200001 instead of MS20257 (AN257)...

...but that's about it...
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Last edited by bjdecker : 11-26-2022 at 11:23 AM. Reason: milspec
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  #5  
Old 11-26-2022, 11:34 AM
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Since. This is a pre-owned kit, I am going over every inch and rivet.
According to the plans, the more aft layer lays on top and what is here agrees with the plan drawings.

Could this be a problem if wind gets under the skin which it quite possible. I’m looking at what could be a potential problem.
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  #6  
Old 11-26-2022, 11:44 AM
PhatRV PhatRV is offline
 
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You are going to trim this overhang during final assembly when you fit the flap to the wings. The overhang is the extra stuff that will be trimmed off per the plan. Donít over think it because a few thousands RVs can fly just right
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  #7  
Old 11-26-2022, 12:36 PM
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Understand the top gets trimmed. Unless I missed it, bottom does not look like it does, and potential for air lifting the bottom skin seems possible.

Not trying to over think it. Just will have an extra dab of Proseal and looks like a good place to put it and make sure skin canít lift up when flaps deployed.
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  #8  
Old 11-26-2022, 12:41 PM
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This is the other side. Sure looks like a good use to keep the skins together.

This isnít my work. Iím just the repairman.
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  #9  
Old 11-26-2022, 03:19 PM
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Lkitson Lkitson is offline
 
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You're right to be concerned.

The attached photos show a crack in the lower skin of my right hand flap that originated at the inboard most rivet that ties the two skins together on the bottom of the flap. I first noticed it a few weeks ago after almost a year and 100 hrs since my 8 first flew. I believe the airflow was separating the lap joint in flight and causing the top skin (that's on the bottom of the lap joint) to flex repeatedly, causing it to crack.

Van's support told me to stop drill the end of the crack but that would mean drilling into the inboard rib so I did what you suggested and applied some adhesive inside the lap joint. I also installed two additional rivets in the lap joint inboard of the crack to prevent it from flexing in the future. I did this on both flaps.
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Last edited by Lkitson : 11-26-2022 at 03:27 PM.
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