Espritmodel.com Telemetry Radio
Reply
Thread Tools
Old Jul 10, 2013, 12:39 PM
Registered User
Estonia, Harju, Tallinn
Joined May 2012
159 Posts
Discussion
Post-curing bagged wings

I'm using MGS 285 epoxy and would like to post-cure my bagged wings. I have a hotbox with a contoller set to 60 C/140 F. I have never done a post cure before.

During post-cure should the wing be
  1. under vacuum,
  2. out of the bag but still have mylars and breather attached or
  3. out of the bag and mylars removed?
martig is online now Find More Posts by martig
Last edited by martig; Jul 10, 2013 at 12:50 PM.
Reply With Quote
Sign up now
to remove ads between posts
Old Jul 10, 2013, 12:43 PM
Just fly it!
wyowindworks's Avatar
Cody, WY
Joined Nov 2007
6,915 Posts
No vacuum and with the mylars on. You will get more fabric print-thru if you take the mylars off before post-curing. Don't exceed the safe stability temps of your foam.
wyowindworks is offline Find More Posts by wyowindworks
Reply With Quote
Old Jul 14, 2013, 07:38 AM
Father of Fr3aK, DLG Pilot
tom43004's Avatar
USA, OH, Worthington
Joined May 2002
6,661 Posts
Post curing with XPS (dow, OC foam) is a balancing act. Foam is stable to about 160F but your post cure should be close to 140F as you've stated. That's not alot of margin for error. Make sure you have good air flow to avoid hot spots etc... and make sure your temp controller is reliable. If no airflow and / or an unreliable temp controller, back it down to 120F and cure longer.
tom43004 is offline Find More Posts by tom43004
Reply With Quote
Old Jul 15, 2013, 10:44 AM
Registered User
Estonia, Harju, Tallinn
Joined May 2012
159 Posts
Thanks for the advice. Indeed, the maximum allowed temperature for the foam is 75 C/ 165 F.
I already did the post-cure. I have a good industrial controller and airflow. I also took measurements during the post-cure with a probe and the temperature seemed fine.
martig is online now Find More Posts by martig
Reply With Quote
Old Jul 29, 2013, 11:29 PM
Registered User
Estonia, Harju, Tallinn
Joined May 2012
159 Posts
Ok, I have post-cured my three wing panels. Actually, I did have delamination bubbles on the first panel, but I thought it was because I messed up the layup ( I tried to wet out multiple layers at once). The second layup was fine, but it also had a local delamination of the bottom skin.
So, I lowered the temperature to 50 C for the next panel and it turned out fine.

Lesson learned - I should've listened to you in the first place.
martig is online now Find More Posts by martig
Last edited by martig; Jul 29, 2013 at 11:34 PM.
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Question Post Cure Molded Repairs? burke757 Multi Task F3X 6 May 26, 2013 02:19 AM
Sold Wing Tote wing bag ocrcdude Aircraft - General - Miscellaneous (FS/W) 0 Mar 10, 2013 07:49 PM
Sold Wings Bags for Electric Planes , 55-59'' inch Wing Span RC4x4 Aircraft - General - Miscellaneous (FS/W) 3 Jan 13, 2013 08:31 AM
Sold Wings Bags for Electric Planes , 45-60 inch Wing Span RC4x4 Aircraft - General - Miscellaneous (FS/W) 0 Jan 09, 2013 11:22 PM
Will polyurethane glue cure in a vacuum bag? greyhound flyer Composites Fabrication 4 Oct 11, 2005 11:51 PM