# Zip line cable used to pull supplies up mtn....

• shane2
In summary: Thanks for your help!In summary, a minimum cable length of 2,060 feet is needed to suspend a 1000 lb object from a trolley, and a minimum engine or motor size of 500 lbs is needed to pull the object.
shane2
If even feasible, what minimum type/size cable reqd with trolly attached that would have maximum 1000 lb load suspended from it, that would be pulled up, from atop, by second separate free line for the following location; 1,000 foot elevation change to where base anchor point was, horizontally, 1,800 feet distant, looking straight down over it? Before cable sag and stretch is taken into account, the length of cable appears to need to be about 2,060 feet long. Also, what minimum strength pull rope would be required for 1000 lbs, if trolley was typical, friction-wise? Also, any clue to what minimum size motor or engine would likely be reqd on drum to pull 1000 lbs via that free line? Thank you, in advance, for any insights.

Welcome to PF!

You should start by drawing a diagram of this. Then we can help you do the calculations. Also, the pull rope needs to be connected below, not above, to avoid rubbing against or tangling with the suspension cable and trolley.

OK, rough sketch here...

Great start.

Now, the minimum strength required by a cable supporting an object comes from when the cable is vertical. Then it only supports their combined weights. The closer to horizontal or straight you try to make the cable (the less it sags), the higher the force. So: how much can it sag without hitting the ground?

russ_watters said:
So: how much can it sag without hitting the ground?

Let's assume as little slack or sag as reasonably achievable, so that the restraining posts at each end are as short as possible, but still high enough to have load off the ground, and not dragging, at either or both ends. When I say 'reasonably achievable', the best I'll be able to do, after top of cable secured, is have a pickup truck winch at bottom end slowly pull and make cable more taut before securing it.

I won't be able to figure out, yet, just how high those posts will need to be. I've got to take into account the height of load and connecting straps up to the trolley at cable (guessing now about 6-8') and also how much we figure out that whatever chosen cable will likely be sagging below a straight line.

Last edited:
I'm also needing to find smallest/cheapest electric or small engine powered winch that'll safely lift, at least, 1000lbs, and has a drum that'll accept 2,000' of 1/4" cable.

## 1. How strong is the zip line cable?

The strength of a zip line cable used for pulling supplies up a mountain depends on several factors, such as the type of cable material, diameter, and construction. However, most zip line cables used for this purpose are made of high-tensile strength steel and can typically hold thousands of pounds of weight.

## 2. How long is the zip line cable?

The length of the zip line cable used for pulling supplies up a mountain can vary depending on the specific needs of the location. However, most cables used for this purpose range from 100 to 500 feet in length.

## 3. Can the zip line cable be re-used?

Yes, the zip line cable used for pulling supplies up a mountain can be re-used multiple times as long as it is properly maintained and not damaged during use. Regular inspections and maintenance should be conducted to ensure the cable remains safe and effective.

## 4. How is the zip line cable anchored?

The zip line cable used for pulling supplies up a mountain is typically anchored at both ends to sturdy and secure structures, such as trees, rocks, or posts. The anchors should be able to withstand the weight and tension of the cable and should be checked regularly for stability.

## 5. What are the safety precautions for using the zip line cable?

Safety is of utmost importance when using a zip line cable to pull supplies up a mountain. Some important precautions include using proper equipment, such as a harness and helmet, for anyone riding on the cable, ensuring proper tension and anchoring of the cable, and conducting regular inspections and maintenance. It is also important to have trained professionals set up and monitor the use of the zip line cable to ensure the safety of everyone involved.

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