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  #1  
Old 07-01-2017, 08:25 AM
Kjkbcaptain Kjkbcaptain is offline
 
Join Date: Mar 2013
Location: Tyler TX
Posts: 5
Default Cracks in belly skin

I have an 8 with about 100 hours on it and it has developed cracks in the skin just aft of the lower cowl air exit, directly above where the exhaust pipes exit. Anyone else see this problem of have suggestions. Thanks.
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  #2  
Old 07-01-2017, 10:30 AM
brad walton brad walton is offline
 
Join Date: Jul 2007
Location: Cypress, TX
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Not an uncommon problem in the RV8. Most theorize the exhaust pulse fatigues the skin on the exhaust ramp. Vetterman exhaust sells downward facing exhaust pipe tips. There are several solutions for repair. You may want to search archives or call me and I'll tell you what I did. Eight three two 7 two two zero 11 two

Last edited by brad walton : 07-01-2017 at 10:34 AM.
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  #3  
Old 07-01-2017, 11:59 AM
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DanH DanH is offline
 
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Location: 08A
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Quote:
Originally Posted by Kjkbcaptain View Post
I have an 8 with about 100 hours on it and it has developed cracks in the skin just aft of the lower cowl air exit, directly above where the exhaust pipes exit. Anyone else see this problem of have suggestions. Thanks.
Cracks are at the aft-most rivet in the floor ribs?

You could try injecting a metal-safe silicone in between the belly skin and cockpit floor. I drilled a few 3/16 holes in the floor panel, squared the end of the nozzle on the sealant tube, pressed it against the floor and pumped in two or three shots of Firebarrier 2000. Pushing 700 hours now, no cracks.

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  #4  
Old 07-01-2017, 02:05 PM
Kjkbcaptain Kjkbcaptain is offline
 
Join Date: Mar 2013
Location: Tyler TX
Posts: 5
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Thanks, the crack is in the bottom forward rivet line, just aft of the curved air deflector.
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