Help FSH - Knot coming undone

[HereWeGo!]

Hi!

I think I am about to go CTB thru full suspension hanging. But I'm worried the knot will come undone. After studies at this site I see that a noose knot or a slip knot are what you would recommend, with more people tend to prefer the noose knot. I would consider my self as an inexperienced knot maker. I'm because of that really insecure if the knot will last for 30 minutes. Probably you will tell me to try hang on it with my hands or something else before the CTB try for testing. But I still think it would be completely impossible to know if it will last. That fact makes me a bit terrified for this method of CTB. How common is a loosened knot? How can I make sure to secure the knot?
For your information will I use a 10 mm polyester rope if that matter.

So, do any of you experienced a knot coming undone during testing or a CTB try? If so, what happened? Did you learn anything from that?
[English isn't my mother tongue so excuse me for possible grammar faults.]

 

[waterbed]

If the knot lasts for 2 minutes it will probably last for 30 minutes.

 

[yearofluigi]

I may be missing something but I don't think you need to worry about a noose knot coming undone; it should be physically impossible to undo it while it's tied around something. I'd be more worried about the rope snapping, so it may be more useful to look into the working load limit of the rope you're using. This article I found may be helpful. It's lengthy (probably SEO spam haha) but seems to contain some useful information about rope strength. According to the article, your rope probably has a working load limit of 500 pounds.

Another thing that might be helpful: While I was testing my hanging setup, I tied the noose to a bag full of dumbbells that was about as heavy as I am. I actually couldn't complete the test because the bag broke under the weight of the dumbbells, but it was still reassuring that the bag broke before the rope did. You might want to try something similar.

In the end it's impossible to be 100% certain that your setup will work (without, um, dying), but hopefully this helps.