Go Back  RCU Forums > RC Airplanes > Questions and Answers
 Joining ABS cowl halves >

Joining ABS cowl halves

Notices
Questions and Answers If you have general RC questions or answers discuss it here.

Joining ABS cowl halves

Old 03-18-2008, 12:42 PM
  #1  
Thread Starter
 
Join Date: Sep 2006
Location: White Oak, TX
Posts: 2,398
Likes: 0
Received 2 Likes on 2 Posts
Default Joining ABS cowl halves

What glue? What lapping material? I'm an experienced builder but have not joined an ABS cowl in thirty years and have forgotten how. If I recall, we used some kind of solvent then but that is the extent of my memory.

I've some 1/64 plywood scraps, would that be suitable for the lapping material?

Thanks
arlyn
Old 03-18-2008, 12:51 PM
  #2  
Senior Member
 
meaden's Avatar
 
Join Date: Jan 2006
Location: Decatur, GA
Posts: 626
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Joining ABS cowl halves

What I've done...

Align it and tack it with CA then fiberglass the seams with thinned finishing resin. Then renforce the soft spots with more fiberglass. Sand, paint, enjoy.
Old 03-18-2008, 01:13 PM
  #3  
Senior Member
My Feedback: (4)
 
MinnFlyer's Avatar
 
Join Date: Apr 2002
Location: Willmar, MN
Posts: 28,519
Likes: 0
Received 8 Likes on 8 Posts
Default RE: Joining ABS cowl halves

I usually use scraps of ABS for lapping and CA for gluing
Old 03-18-2008, 01:15 PM
  #4  
Senior Member
My Feedback: (1)
 
Campy's Avatar
 
Join Date: Jan 2002
Location: Baltic, CT
Posts: 3,613
Likes: 0
Received 1 Like on 1 Post
Default RE: Joining ABS cowl halves

Use strips of tape to secure and align the cowl.

Then TACK glue the cowl in several places with thin ca. When the ca has dried, remove the tape.

Use strips of 2 oz fiberglass cloth about 1 1/2" - 2' wide. Place the strip over the seam on the inside of the cowl. Use a piece of scrap music wire about 1/8" in diameter to hold the fiberglass in place and use THIN ca to secure it to the cowl. Don't forget to add a strip around the back of the cowl as support/reenforcement for the attaching screws.

After everything has dried, use spot putty (red stuff in a tube in the auto section of Wal-Mart) to fill the outside of the seams.

Sand the putty smooth, prime and paint.
Old 03-18-2008, 01:23 PM
  #5  
Senior Member
 
meaden's Avatar
 
Join Date: Jan 2006
Location: Decatur, GA
Posts: 626
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Joining ABS cowl halves

No, not the red stuff! The blue stuff! Super Fil. The red stuff is way to heavy.
Old 03-18-2008, 02:16 PM
  #6  
My Feedback: (2)
 
Join Date: Feb 2002
Location: Leander, TX
Posts: 6,204
Likes: 0
Received 1 Like on 1 Post
Default RE: Joining ABS cowl halves

I've been using 2 or 4 oz glass for joining then pvc pipe glue. A quick spray of 3m77 or 3m45 holds the joining glass in place while gluing. Dont use a big glob of pvc glue, it might melt the abs if its real thin. Thick pieces have never given me any trouble.
Edwin
Old 03-18-2008, 03:08 PM
  #7  
Senior Member
 
broke_n_bummin's Avatar
 
Join Date: Mar 2006
Location: Kershaw, SC
Posts: 838
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Joining ABS cowl halves


ORIGINAL: Edwin

I've been using 2 or 4 oz glass for joining then pvc pipe glue. A quick spray of 3m77 or 3m45 holds the joining glass in place while gluing. Dont use a big glob of pvc glue, it might melt the abs if its real thin. Thick pieces have never given me any trouble.
Edwin
I like PVC cement better than CA. It's not as brittle, and to me it makes a better bond. You can either span the seem with ABS scraps or use fiberglass cloth. Both work great.
Old 03-18-2008, 07:59 PM
  #8  
Thread Starter
 
Join Date: Sep 2006
Location: White Oak, TX
Posts: 2,398
Likes: 0
Received 2 Likes on 2 Posts
Default RE: Joining ABS cowl halves

Thanks to all for the input...
Old 03-18-2008, 09:05 PM
  #9  
Senior Member
My Feedback: (2)
 
somegeek's Avatar
 
Join Date: Jul 2005
Location: Vancouver, WA
Posts: 2,138
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Joining ABS cowl halves

I had to assemble a three piece cowl for my Herr Pitts Special kit. Used pieces of the flashing to back the seams on the cowl half. CA seemed to slightly melt the plastic giving the seams a very solid bond. Used microballons to fill in the seams.

somegeek
Old 03-21-2008, 10:54 PM
  #10  
Thread Starter
 
Join Date: Sep 2006
Location: White Oak, TX
Posts: 2,398
Likes: 0
Received 2 Likes on 2 Posts
Default RE: Joining ABS cowl halves

It is nice to get a report of how answers helped. I followed the advice to use fiberglass tape and CA and it went great. I used 3/4 inch wide glass and thin Ca after cleaning with acetone and taping the outside. I first did the aft borders and then the joints and had absolutely no problems holding the glass down and gluing in steps.

I found the red body putty but not a blue and the red worked great. It sands smooth enough for primer very easily. It is heavy but very little is left on so on larger planes it is not much issue.

Thanks again for all the input.

arlyn
Old 03-26-2008, 07:42 PM
  #11  
Senior Member
 
Join Date: Dec 2004
Location: Norwalk, OH
Posts: 134
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Joining ABS cowl halves

The best way to handle ABS cowl is to replace it with a fiberglass one.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On


Thread Tools
Search this Thread

Contact Us - Manage Preferences Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.