All Day Dan

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I have used gorilla glue to plank a limited portion of a model from the bottom of the firewall to the first former. The area is seven inches wide by six inches long. You can see the area behind the engine and firewall in the image. It extends up to the leading edge of the landing gear. The planks are 3/8 by 3/16 inch thick balsa that wind up 1/8 inch thick after sanding. The model has been flown for about 100 hours with a Brison 2.4. I inspected the glue joints for degradation and have not noticed any. Is the use of this type of glue in a high vibration environment a sure failure?

Mike Connor

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It sounds to me like you are proving it is not a sure failure. I never had an airplane last 100 hours of flight time.

All Day Dan

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I hope your right. Dan

All Day Dan

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Mike, You're right. I just went and checked my flight log. It's more like 25 hours of flight time. I don't know where I got that 100 hours from. I was probably bragging. In any case, the glue joints still look solid. Thanks, Dan

Deadeye

I have used Elmer's polyurethane glue on high stress, high vibration areas with no problems; on planes with over 100 hours of flight time. I have seen older epoxy joints shatter like glass if stressed.

All Day Dan

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Thanks for the input. I'll wait to see what happens. So far the joints look good. Dan.

daven

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I've been using it on my pylon racing firewalls at over 20,000 rpm and they have been holding up fine.

All Day Dan

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Good input daven. My joints are also hoding up. Dan.

cyclops2

I have dropped my 35# plywood PTB drop 4' onto a concrete floor and only had dented wood.

Titebond II. Most non-hitech glues, are very shock resistant.

Somewhere, I read that Epoxy keeps curing in hardness long after we are satisfied with it in 24 hours.
Sort of like Concrete.

Rich

Deadeye

Right you are on the epoxy. The breakage I referred to was on a 1/3 Lanier Extra that was partially built 8 or 10 years ago. I was finishing it for a friend last year, and noticed all it took was a small bump, and the joints where the spruce longerons met the fuselage formers just broke away. The epoxy flaked off and fell to the floor. I repaired the joints with poly glue.

cyclops2

Ha Ha.
55 years ago I used Polyester Epoxy. 10 years later it still had not fully hardned.

Rich