Paracord Shock Load

Here’s a question that I’ve wondered about:  What’s actually a safe load to put on paracord in case of it slipping and dynamic loading?  Paracord should be a shock cord since it was originally for parachutes, but it’s always rated by a static load weight.

Here’s the best I’ve gathered (internet, please correct me if any of this is wrong):

An approximate equation for shock load is:  shock load = weight * ((fall distance / elongation) + 1)

Properly rated paracord should elongate at minimum 30% (more is better so let’s use 30% as a worst case).

If are you dropping something with the cord, the fall distance is the cord length or 100%.  The equation reduces to weight * (1/0.3 + 1) or weight * (13/3).  A weight being dropped on paracord can generate a shock force of about 4.333 times it’s weight.

So going in reverse, if we take the static load of paracord as it’s net breaking strength, do not load it with more than the inverse of that factor in weight, 3/13 or 23% of it’s rated strength.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s