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DrBouvenstein t1_iynjes8 wrote

FYI, that's too much of a drop. The max. slope for a zipline is 3' of vertical per 100' of horizontal with no brake, and 6' of vertical if you are using a proper brake:
https://www.ziplinegear.com/pages/how-to-build-a-zip-line-section-one-concepts#:~:text=ZIP%20LINE%20MUST%20NEVER%20EXCEED,MAY%20CAUSE%20INJURY%20OR%20DEATH.

Please do not make a death trap zipline that drops 25' over only 225 feet of vertical.

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CvilleHokie605 OP t1_iynkqak wrote

Appreciate this. I can adjust the drop with placement on the tree and the eventual termination platform. I'm just guessing at the drop right now anyway but will make proper calculations prior to eventual construction.

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chiffed t1_iyoanhf wrote

Adding to this, the horizontal tension is insane the less deflection in the highline. I would backstay the post to a forest of equalized ground anchors. Actually, I'd call up my rigging instructor. That's a big project with a bunch of failure modes. I wouldn't build it without him helping on the design.

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