The answer to Gorilla glue ???

Discussion in 'Wood Construction' started by Tarkus, Jul 10, 2015.

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  1. Aug 2, 2019 #81

    TFF

    TFF

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    100 years ago 10 hours was lifespan for an airplane. Now we know how to fly and design airplanes pretty reasonably, a plane needs to be able to last a regular human lifespan to not have a question of is it strong. I say no questions asked for 70 years is about right. When it becomes a vintage airplane, I will accept restoration needed. In the 50s when Cubs and Champs were cheap and stored outside, you also recovered the plane every five years replacing the rotted wood or steel tubing. Every five years the plane was gutted. I would have to cut the covering off every year for piece of mind if I believed in using GG. If you are allergic to epoxy, build aluminum and rivets.
     
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  2. Aug 3, 2019 #82

    Rockiedog2

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    The thing is kindling
     
  3. Aug 3, 2019 #83

    MadProfessor8138

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    I don't have a set of Koala plans in my inventory but I would assume it is built with techniques similar to a Team Z-Max....???
    While GG shouldn't have even been an option for the build,maybe it's not a total loss.
    Better builders than myself should chime in on this and correct me if I'm wrong....
    A butt joint of 2 pieces,even using T88,isn't really that strong.
    The strength comes from the corner blocks added to the pieces and then the gusset over top of the joint.

    Here's an example pic of the corner blocks that have been added to the fuselage side of my Stork build and will be sheeted with plywood once cleaned up.
    The butt joints are weak initially....then stronger with corner blocks.....and finally rock solid when the ply is added to gusset the joint.
    20190704_193911.jpg

    Would it be possible for you to add corner blocks to all joints in the fuselage and tail surfaces with T88 and then gusset or ply over the joint as usual ???
    The corner blocks will save the questionable butt joints and then the gusset will add the strength.
    You didnt post any pics so I'm not sure exactly how far along the build is.
    Just an idea.....

    Kevin
     
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  4. Aug 9, 2019 #84

    John wadman

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    Nice glue saturation and squeeze out there Kevin! That puppy definitely wasn't glue starved. That baby is staying put
     
  5. Aug 9, 2019 #85

    MadProfessor8138

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    It looks like that for a reason...lol
    I have a habit that I'm not quite sure is good or bad.....
    1.I rough sand the parts lightly and then coat the 2 mating parts with T88 a few minutes before I work with them.
    2.Then I reapply more T88 to the surfaces and set them in position...I get good squeeze out.
    3.Staple them so they dont move.
    4.Any left over T88 goes on top of the joints.
    5.Clean everything up once it's all cured.

    I figure that since I have left over T88 I might as well use it....
    And since the joints are not suppose to be a perfect fit because it will starve the joint by squeezing the T88 out...the T88 tends to run a lot because of its viscosity and the little clearance between the parts.
    So,by putting the left over T88 on top of the joint it will hopefully replace anything that runs out.

    Mechanically,the practice makes sense...however,I'm sure there are better builders than me on the forum that can chime in on whether this is a good practice or a waste of time.


    Kevin
     
  6. Aug 9, 2019 #86

    John wadman

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    Looks like a good fit and plenty of glue. Once sanded smooth it’ll be pretty and strong!
     
  7. Aug 10, 2019 #87

    John wadman

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    I watched the dvds of the build. Roger was using gorilla glue. ooohhh noooo!
     
  8. Aug 10, 2019 #88

    TFF

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    With so many designs, they are throw away to him. They probably only have a six month lifespan.
     
  9. Aug 11, 2019 #89

    MadProfessor8138

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    He wasn't using GG.....
    There's a glue that was used a lot in aircraft construction back in the 80's and 90's that performed like GG....it foamed up too.
    I can't recall the name of it right now.
    Roger built the original RW19 in 1997 and GG wasnt available to the public until 1999.

    Kevin
     
  10. Aug 11, 2019 #90

    poormansairforce

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    It was probably Excel which has some solvents mixed in. Thats what I used in the mid 90s.
     
  11. Aug 12, 2019 #91

    John wadman

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    Is it any good? Has it been tested for aircraft use? It looks just like gorilla glue in that it expands and foams the same way. Is it just a derivative of GG? A single part sure would be nice!
     
  12. Aug 12, 2019 #92

    John wadman

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    just did a search on excel glue and it is now called Grizzly Glue. Seems Grizzly Tools bought it. But it is just Polyurethane glue which is what Gorilla Glue is. Maybe the chemistry is slightly different. maybe if the chemistry is different the foam might be more solid. I'm researching it more.
     
  13. Aug 12, 2019 #93

    John wadman

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    I'm wrong about Excel becoming part of grizzly imports. I could have sworn that I saw that glue on the Grizzly Imports site but it was gorilla Glue they are selling. Excel changed the name for marketing purposes. It is however a polyurethane glue as is Gorilla glue. Th only way to tell if the chemistry of one is any better than the other is to do failure tests. The glue test video that was posted on this topic thread tested Gorilla brand. . . and it didn't stack up very well to the other glues.
     
  14. Aug 12, 2019 #94

    poormansairforce

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    Yes, just PU with solvents. Supposed to penetrate more but thats not the problem. PU is brittle and over time who knows.....?

    Built my Minimax with it because everyone said it was great. But after another pilot ran it out if gas, dead sticked into a bean field and flipped it I set it aside due to time. By the time I went to fix it I knew more about it thanks to the web and looked the diagonals over that had snapped and saw joints that had let go as well. Gasoline and a match! That was a sad day! Don't want to see anyone waste their time.
     
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  15. Aug 12, 2019 #95

    rtfm

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    Hi guys,
    I haven't read the whole thread, but what's wrong with t88 epoxy?
     
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  16. Aug 12, 2019 #96

    litespeed

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    Absolutely nothing at all.

    Except for those who hate mixing and are cheap.

    Too cheap for safe flight in my view.
     
  17. Aug 12, 2019 #97

    MadProfessor8138

    MadProfessor8138

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    Read the whole thread.......

    Kevin
     
  18. Aug 12, 2019 #98

    John wadman

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    T88 is great!
     
  19. Aug 16, 2019 #99

    mcrae0104

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    Absolutely nothing, if you like white airplanes.
     
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  20. Aug 16, 2019 #100

    John wadman

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    ha ha ha. Funny but true
     

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