Q: What length cable should I purchase for my zip line?
To answer this question you must first measure the distance between your two anchors. You can do this buy using a tape measure (if you have one long enough) or you can start at your first anchor and walk toe-to-heel, counting each step until you reach the second anchor. This will give you an estimate of exactly how far apart in feet that your anchors are from one another. Most likely you will end up with an odd number, say 182 feet. If you buy a zip line kit that includes a 200 foot cable you might come up short. As a general rule of thumb you should increase your zip line length buy 50 foot increments. The good news is if you have extra cable you can put it to use!
You can create Zip Line Cable Sag, many homeowners who buy zip lines think that their zip line cable will be guitar string tight between the two anchors. This is false. Zip line cable sag is healthy for the zip line because it reduces anchor strain and will create a natural gravity brake on the portion of the zip line that is up hill.