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Building Tips and technical articles. => Building techniques => Topic started by: David_Ruff on February 08, 2014, 02:40:31 PM
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I find that I am using Sig Weld glue often in my builds. Mostly for high strength areas like the plywood doublers and hardwood to balsa type applications. It seems to work very well.
Any of you doing that? I know many times the plans call for epoxy. But I am using Sig Weld for wood to wood.
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Hi David,
If it wasn't for the fact that I pulled some plywood doublers off of a profile that was 20+ years old and the center area was still not fully cured, I would use it there myself. Since epoxy is a chemical cure that can't happen.
Sig Weld is a very good glue and I have used a lot myself.
BIG Bear
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Hmm..interesting. Maybe not the best for doublers. But your doublers did not fail?
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Ruffy,
Epoxy can be heated and the parts separate easily.
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Hmm..interesting. Maybe not the best for doublers. But your doublers did not fail?
Hi David,
There was about 1" or so all around that DID cure so the doublers never lifted or anything. Just really surprised to find that gummy area in the middle. ;D
BIG Bear
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Yeah, we learned years ago and never thought about it until we had one delaminate. Epoxy or Gorilla Glue for laminates.
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Some of those type glues (Titebond) can be allowed to dry (on both mating surfaces) and then fused together with heat. I'd worry about the plywood laminations, but heating from the balsa side should work ok. Some guys use this trick for sheeting D-tube and C-tube wings. Might be worth an experiment or two, at least. D>K Steve
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While we would use epoxy for doublers in our application, a woodworker would always use yellow glue for something like that. Why is it ok for furnature, but not a model airplane?
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David,
A bit of heat and they removed quite easily.
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What is Sig Weld? I am using tubes of Sigment. Making doublers with titebond, I have drilled several 1/32 holes in the plywood to make sure it could all dry.
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What is Sig Weld? I am using tubes of Sigment. Making doublers with titebond, I have drilled several 1/32 holes in the plywood to make sure it could all dry.
SIG Weld is a PVA type glue like Elmer's Glue-All.
SIG-ment used for doublers tends to have the same issue, although with balsa and plywood it usually eventually dries. I use medium CA for doublers myself, using the grid method as shown in the Satellite City videos.
Brett
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Brett, do you have a link for that video? I am interested.
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Brett, do you have a link for that video? I am interested.
I posted it here a few months ago: http://stunthanger.com/smf/index.php?topic=31972.msg317971#msg317971
You will definitely learn something, and bear in mind this was A LONG time ago.
Brett
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I used a heat gun and removed epoxied motor mounts from a 25 year old model. I ended up pulling the entire plug out of the tank area. The balsa was like new under the epoxie.
Ed
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I used a heat gun and removed epoxied motor mounts from a 25 year old model. I ended up pulling the entire plug out of the tank area. The balsa was like new under the epoxie.
Ed
I like the idea of using a heat gun ... I have a project in mind now.
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In looking at some plans from the early 50's pre epoxie era, several of the plans show the doubler being screwed to the basa with small wood screws. What does that say? They didn't trust glue either LL~ LL~ LL~
Hi Ty,
On the Wicked Witch plans it shows wood screws into the motor mounts, also, IIRC. Plus a screw or two somewhere around the stab............ yep, no one trusted glue! LL~ LL~
Bill