# The answer to Gorilla glue ???

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

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1. Aug 17, 2019

### BBerson

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I was reading the Sport Aviation archives from the 50’S. They used casein (milk) glue. It said the glue shear strength was 250 psi., as I recall. So if that casein glue was good enough then, another modern glue that exceeds 250 psi shear might also be adequate, even if not as strong as epoxy in some ways. The joints need to designed with enough glue area in any case.

2. Aug 17, 2019

### BJC

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Aviat (Pitts) specified Weldwood Plastic Resin for the ribs in the certificated S-1S.

I would be very surprised to learn that any of the experimental Pitts / Wolf variants (Sean Tucker, et al) use anything other than T88.

BJC

3. Aug 17, 2019

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i tested joints with weldwood plastic resin when i built my first wood and fabric plane and it didnt test well. i used WEST system on that plane. i still have a gallon tub of it on my shelf. im temptd to test it again after i do my failure tests with the epoxy im currently using

4. Aug 17, 2019

### TFF

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If you can’t glue Weldwood in 100 deg heat with a ton of pressure, it will fail. Glued Cold equals bad joint

5. Aug 17, 2019

### BJC

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I’m willing to bet that there are over 1,000 propellers flying on HBA and ultralights that are being held together with Weldwood Plastic Resin, not to mention spars.

BJC

6. Aug 17, 2019

### TFF

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Culver uses Weldwood but they cure it in an oven in the clamps. Someone working in a cold basement in Minnesota using the stuff like Elmer’s is why it has gained a reputation. It was promoted as easy. There are a lot of restoration people who know how to use it that would prefer it. It’s just got a rap that it’s not going to shake.

7. Aug 18, 2019

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I've got that entire gallon tub of it on the shelf in the shop. I tested it in the S. Florida heat in a non-insulated metal building with no airco! It was pretty warm. And I did clamp it. But now I'm tempted to test it again just for the heck of it. I'll do my destruction tests on the epoxy glued sticks and then maybe recreate the exact same tests with sticks laminated from the Weldwood. I think I will. It'll be awhile but when I do I'll post the results on the wooden airplanes part of this site. Maybe I screwed up but I can speaka and reada di english real good (real well) and the instructions were pretty simple to follow.

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8. Aug 18, 2019

### TFF

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I think the stuff can spoil too. That is where testing starts being not fun. It sometimes costs a lot to just say no. Test $200 worth of glue to buy$200 worth of glue.

9. Aug 18, 2019

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TFF, I just posted the preliminary results of my wood tests on my builders log site under Ragwing RW 19/20 wood and fabric Storch. Not convinced they are accurate though. Got some more testing to do . I’ll throw in some Weldwood samples too.

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10. Aug 18, 2019

### Doran Jaffas

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11. Aug 18, 2019

### Doran Jaffas

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Resourcinol glue was used in aircraft for years. The glue must be properly mixed and clamped but produces an excellent joint. I used it on a propeller I made very successfully.
I am old school but I would be very reluctant to use any glue not specifically tested for aircraft use. Especially when looking at the long term viability.

12. Aug 18, 2019

### BBerson

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Bud Evans (VP-1) did a large test of Recorcinol, Weldwood Plastic resin and Aerolite glue.
He ranked Aerolite best, Weldwood was next (used for Fly Baby) and he said Recorcinol failed on half the bond.

13. Aug 18, 2019

### BJC

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Anyone have any experience with FPL-16A? It was reputed to be very good.

BJC

14. Aug 19, 2019

### mcrae0104

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Was this in Sport Aviation? I like Aerolite (other than perhaps the concerns from the arguably-nanny-state Australian authorities--no offense intended to my friends down under) but resorcinol seemed to be this troglodyte's last best hope. And now you burst my balloon.

15. Aug 19, 2019

### mcrae0104

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Do you have the EAA wood construction book?

16. Aug 19, 2019

### BJC

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No.

17. Aug 19, 2019

### BBerson

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Yes, in Sport Aviation 1965 or 66. I just read it yesterday but the search function doesn't work so I couldn't find it.
Now reading 1969 today. There was another article on FPL-16a . But they didn't mention high temps then.

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18. Aug 19, 2019

### mcrae0104

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There is a bit on FPL-16A. I will take a look when I have it handy.

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19. Aug 19, 2019

### litespeed

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As a Aussie,

What was the concern about Aerolite Glue?

Don't worry, we rarely take offence.

Our Nanny state tends to be over the top sometimes, unless it involves big bussiness. Then it tends to be open season to do anything.

20. Aug 19, 2019

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