autoblock

[Biner]

how long is the piece of accessory cord you cut for an autoblock

[rockgremlin]

Depends on how much friction you want, and what material you are using. Since an autoblock is just a big loop wrapped around your rappel line, I would say....no more than 18 inches? YMMV. Try it out and see for yourself.

[rock_ski_cowboy]

Depends on how much friction you want, and what material you are using. Since an autoblock is just a big loop wrapped around your rappel line, I would say....no more than 18 inches? YMMV. Try it out and see for yourself.

You'd be surprised how much length you need. More than 18. Seems like I've used maybe 3 feet or so. Knotting the two ends together with a double fishermans (standard for prussiks) will take at least 8 to 10 inches, less or more depending on the diameter of cord. Looping it on your harness will take another couple. Been several years since I've used a prussik or autoblock so its fuzzy. Yeah, try it out and see for yourself, the stuff is cheap. Buy a 5 foot length and whittle it down if needs be.

[Iceaxe]

FWIW: Autoblocks are seldom/never used in canyoneering.

[Biner]

I really appreciate all the replies to my questions. You guys (gals) ROCK!