Will fiberglass tape resist stretching when used as a hinge?

I have a flop wing glider and the hinge would be under a lot of stress when the wings deploy. I've tried mylar, blenderm, and even duct tape (because the adhesive is so strong). They all tend to stretch due to the force of the wings opening, so that the wing joint gets wider and wider. (The glider is a diagonal flop wing, so strong elastic is required to pull the wings open at ejection).

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