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  #1  
Old 08-27-2018, 07:58 PM
Rob H Rob H is offline
 
Join Date: Jan 2016
Location: Knoxville, IL
Posts: 91
Default 22 iS Fuselage question

Page 22iS/U-05, Step 1
I want to understand exactly where to scuff. 1) Is it only where tank sealant is called for in Steps 4 & 5? Or will there be sealant applied to the remainder of the firewall edges in another section?
2) Also, since Iíve painted F-01272-1 and F-01217-L & R, should I assume Iíll need to remove the paint where they mate to the firewall so that tank sealant adheres? Iím not painting the firewall.
3) Is the sealant there just to protect against heat, fumes, fire, moisture etc? I donít think it was called for in the old fuselage kit. Thanks Rob
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  #2  
Old 08-27-2018, 08:19 PM
Mich48041 Mich48041 is offline
 
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Location: Riley TWP MI
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Fuel tank sealant is not fireproof. It gives off toxic fumes when burning. And once ignited, keeps burning.
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  #3  
Old 08-28-2018, 03:19 PM
Rob H Rob H is offline
 
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Location: Knoxville, IL
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Thanks Joe, Iím sure with a fire, the sealant would be low on the worry list. Not really the question. Maybe someone could respond whoís built the new iS fuselage kit. Iím wanting to know if thereís sealant just between the two ribs and on the top flange of the firewall like it describes in this section? Or, if more sealant is applied in a later section around the remaining edge? I donít want to scuff and clean more than necessary.
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RV12 - building
Empennage finished
Wings finished
iS Fuselage in progress
ULS Fuselage kit - SOLD


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Knoxville, IL
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  #4  
Old 09-10-2018, 12:37 PM
rcarsey rcarsey is offline
 
Join Date: Jul 2012
Location: North Brunswick, NJ
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I just do what the book tells me to do. I know the other edges get sealed with tank sealant (not sure why its tank sealant and not firewall sealant). I'm not sure why the entire bottom joint isn't sealed..and its only the center.

My guess is that and moisture on the firewall will travel down.. hit the two stiffeners..and be channeled to the center part of the firewall where it would seep inside the center channel (between pilot and copilot).
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  #5  
Old 09-10-2018, 06:54 PM
STEVEM STEVEM is offline
 
Join Date: Jan 2005
Posts: 39
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Quote:
Originally Posted by rcarsey View Post
I just do what the book tells me to do. I know the other edges get sealed with tank sealant (not sure why its tank sealant and not firewall sealant). I'm not sure why the entire bottom joint isn't sealed..and its only the center.

My guess is that and moisture on the firewall will travel down.. hit the two stiffeners..and be channeled to the center part of the firewall where it would seep inside the center channel (between pilot and copilot).
The entire perimeter of the firewall is sealed in a later step, when completing the forward fuselage.
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  #6  
Old 09-11-2018, 08:51 AM
rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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Quote:
Originally Posted by STEVEM View Post
The entire perimeter of the firewall is sealed in a later step, when completing the forward fuselage.
Correct

Just the bottom center is done during assembly because the fwd tunnel is very narrow and sealing is difficult to do after it is assembled.
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