Re: [bertusgeert] Rope Jump - Base Jump - Video
I've done some fairly massive rope jumps. If you ever have the chance to experience one you'll notice two things:
1.) Freefall has never felt more intense. For some reason, I get way more amped in freefall than on most BASE jumps.
2.) The catch at the end of the jump is way softer than you imagined it would be.
You have to consider that when you take a lead fall in the climbing gym, you are stopped abruptly because there is only about 30 feet of rope
total over which the energy of your fall is distributed.
On a rope jump, you have much more energy to absorb because you've been falling for longer, but the entire rope jumping rig is designed to absorb and redistribute the energy of the jump. The setup in the video is one where not only do you have all the jump line absorbing the impact forces, but that jumpline is attached to a dynamic tyrolean which is basically a massive shock absorber.
I've done over 500 feet on a single 10.2mm climbing rope. This was anchored to a steel bridge girder with no tyrolean to assist in absorbing the energy. The softness of the catch was very suprising.
I chatted with Dano about whether there was a better option than the GriGri since it seemed like it was spreading the load over a very small portion of the jumpline. He was convinced that it would be okay.
I also have to take a moment to warn people from trying to re-create this type of jump on their own. I used to rope jump in the NorCal area with Dano, Kirk Arens, and a bunch of other guys. Pretty much every weekend and on some weeknights we'd close down the climbing gym, load the gear into our cars, and would drive off to one of several very nice spots and jump all night. We helped build the rigs we were jumping on. Dano watched what we were doing and approved, even jumping our rigs himself. Dano knew what he was doing. Kirk knew what he was doing.
I left for bootcamp on October 3rd, 1998. Towards the end of bootcamp, I received a letter (because I wasn't allowed to have phonecalls) with some bad news. On the day before Thanksgiving, Kirk died making a rope jump in Auburn California. Eight days later, Dano was also dead from a rope jumping incident. Two guys who knew what was up.
edit:typos