EPP repair?

[063andrew]

Hello all, just been flying my Techone Tempo and I broken the rudder hinge, how do people go about repairing this? I did think about glueing nylon hinges on. All advice is appreciated.

[fhhuber]

Several ways to go about it.

EPP is safe to use normal CA on
but its rarely what you have with a foam model. They are usually EPS or EPO. EPS is damaged by normal CA. EPO you can put acetone on a rag and rub on the foam to clean it.

Test a bit of scrap with the glue you plan to use. I shave a bit from inside the airplane.

Various methds have been used t re-hinge when the EPO breaks.
EPS doesn't work as a hinge, it fractures to rapidly from repeated bending.

Common CA hinges work fine. Glue in with THIN CA foam safe if needed.
Robart Hinge Points are great, installed with a bit of expanding foam polyurethane glue. It does not take much glue.

Some people will use a flexible glue applied sparingly and just glue the hinge line back together. E-6000 works (similar to Shoe Goo) Be sure to apply sparingly because thick application CAN damage the foam.
Don't use common silicone sealant/glue because this peels from the foam (EPS or EPO) after a relatively short time and leaves a nearly impossible to remove residue that prevents any glue (including silicone sealant) from sticking.