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  #1  
Old 11-15-2018, 10:46 AM
az_gila's Avatar
az_gila az_gila is offline
 
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Location: 57AZ - NW Tucson area
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Question McMaster seal amount of squish

I started a new thread to get a specific answer.

I'm getting ready to make lots of dust and making the seal area of the doors ready.

Based on lots of other postings I bought most common the McMaster-Carr 1120-A411 seal - 1/4 inch web and a 3/8 bulb.

All of the posting seem to say to leave a 0.25 inch gap for the seal to squish into, but my initial checking of a foot or two seem to make the bulb too compressed.

This is about 0.25 shown in a C-clamp -



This is the view with an extra 1/16 inch gap -



Am I missing something here? It seems like the 5/16 gap would create a very adequate seal.

Did previous builders really use a precise 0.25 gap? Or was it "fudged" a bit larger?

My test areas have been in the middle of the sides and seem pretty representative.

Since the web needs sanding in spots and building up in others the seal I bought should be OK - I'm just not sure of the exact gap to make.
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EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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  #2  
Old 11-15-2018, 12:06 PM
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Carl Froehlich Carl Froehlich is offline
 
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Iíve posted on this in the past, but perhaps you did not see it.

Before you dive into grinding away fiberglass, consider the much simpler option to put the seal on the door. Self adhesive seals from McMaster come in various sizes.

This has worked well for me - and is a good now as it was six years ago when I put them on.

Carl
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  #3  
Old 11-15-2018, 12:51 PM
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Quote:
Originally Posted by Carl Froehlich View Post
Iíve posted on this in the past, but perhaps you did not see it.

Before you dive into grinding away fiberglass, consider the much simpler option to put the seal on the door. Self adhesive seals from McMaster come in various sizes.

This has worked well for me - and is a good now as it was six years ago when I put them on.

Carl
I agree with Carl here. Although I put my McMaster seal on the opening, I like the idea of it being on the door itself instead. It also eliminates the possibility of damaging the seal getting in and out of the cabin.
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  #4  
Old 11-15-2018, 12:59 PM
lr172 lr172 is online now
 
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No results here yet. I did a minimum .025 gap with .025 material thickness. I
wasn't concerned if it got a bit bigger clearance in spots. My thought was that I could take it to 5/16 in spots if I have problems, as the mounting side of the seal can be squeezed down and still grab.

I stopped on the top to let my interior paint dry and moved to the panel. However, I plan to do the final install of the top next week and do final tweaking of the doors. At that point I will test the seals and let you know if it all worked.

Frankly, I think that I like the first picture with the tighter squeeze. It will likely seal better. The second pic looks like it is just barely meeting or coming up short on the recommended minimum of 1/2D compression.

Larry
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Last edited by lr172 : 11-15-2018 at 01:05 PM.
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  #5  
Old 11-15-2018, 12:59 PM
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az_gila az_gila is offline
 
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Quote:
Originally Posted by Carl Froehlich View Post
Iíve posted on this in the past, but perhaps you did not see it.

Before you dive into grinding away fiberglass, consider the much simpler option to put the seal on the door. Self adhesive seals from McMaster come in various sizes.

This has worked well for me - and is a good now as it was six years ago when I put them on.

Carl
I just prefer the idea of a solid locking tab to hold the seal in place - especially in a hot AZ hangar or ramp.

Interested in the gap dimension used for the 1120-A411 seal.

That's why I started a new thread...
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Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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  #6  
Old 11-15-2018, 01:04 PM
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az_gila az_gila is offline
 
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Quote:
Originally Posted by lr172 View Post
No results here yet. I did a minimum .025 gap with .025 material thickness. I
wasn't concerned if it got a bit bigger clearance in spots. My thought was that I could take it to 5/16 in spots if I have problems, as the mounting side of the seal can be squeezed down and still grab.

I stopped on the top to let my interior paint dry and moved to the panel. However, I plan to do the final install of the top next week and do final tweaking of the doors. At that point I will test the seals and let you know if it all worked.

Frankly, I think that I like the first picture with the tighter squeeze. It will likely seal better. The second pic looks like it is just barely meeting or coming up short on the recommended 1/2D compression.

Larry
I tried a 2 ft seal test strip on the lower front side of one of the doors and it was almost impossible to push the door into place. I'll keep plying around making more dust...
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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  #7  
Old 11-15-2018, 01:08 PM
lr172 lr172 is online now
 
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Quote:
Originally Posted by az_gila View Post
I tried a 2 ft seal test strip on the lower front side of one of the doors and it was almost impossible to push the door into place. I'll keep plying around making more dust...
have you measured out the seal requirement to see how much extra you will have? I have been hesitant to cut a sizable piece off yet, reading that you will use most of the 25'.
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  #8  
Old 11-15-2018, 01:10 PM
lr172 lr172 is online now
 
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Quote:
Originally Posted by az_gila View Post
it was almost impossible to push the door into place.
But the data we need is how much the seal will relax after a bit of use. I have read many accounts of tight doors getting easier after a bit of use.

Larry
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  #9  
Old 11-15-2018, 01:47 PM
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az_gila az_gila is offline
 
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Quote:
Originally Posted by lr172 View Post
have you measured out the seal requirement to see how much extra you will have? I have been hesitant to cut a sizable piece off yet, reading that you will use most of the 25'.
I just went and bought 50 ft, and I'll use the extra to make the 1/4 web wider where needed using it as a mold partly filled with flox.
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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  #10  
Old 11-15-2018, 01:49 PM
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az_gila az_gila is offline
 
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Quote:
Originally Posted by lr172 View Post
But the data we need is how much the seal will relax after a bit of use. I have read many accounts of tight doors getting easier after a bit of use.

Larry
Yes, but surely this will seal...

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Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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