The pull test is a great idea. How much? If I can pull the loop on my 1/3 scale anything as hard as I can with one hand and it still releases, it is just about enough.
We can't all have your arm nearby to do a pull test. If you get a fish scale and come up with number, that would be the standard.
Someone is sure to mention using a "weak link" loop in the sailplane. While good in theory, when you're going down fast waiting for your weak link to fail, call me. Actually using line for loops that will break before the tow line rips the release from the nose of your glider makes sense, but it won't be practical to rely on it as a fail safe if it is strong enough to pull your sailplane up in the first place.
Weak link is not practical. I sure don't want it to break when I just lifted off and nowhere to turn. Just make sure you have a working system and a back up tow release in the tug.
Like the full size counter part, pre-flight and preventive maintenance. make sure your plane is in good condition before you fly it.
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