Introduction: When you're setting up a Gopher Target System (especially on longer ranges), understanding the horizontal tension is crucial for safety and durability. Knowing how to properly tension your static lines to allow proper sagging will reduce stress on anchor points. In this guide, we’ll break down how to calculate the horizontal forces acting on your support structures at each end, when the target shuttle is suspended at the center of your range.
Understanding the Forces at Play
When your GopherCord supports a weight at its center, it experiences both vertical and horizontal forces. The goal is to determine the horizontal force (T_H) pulling at each end so you can select the right structure and hardware to ensure a secure installation.
Given Variables:
W = Total weight suspended at the center (lbs or kg)
L = Total horizontal span of the cable (ft or m)
h = Vertical sag from the supports to the lowest point (ft or m)
T_H = Horizontal tension at each end of the system (unknown force)
Calculate the Horizontal Tension
Let’s say you are installing a target retrieval system where:
The weight of the Xtreme target shuttle, crossbar, target boards and GopherCord is about 9 lbs. Wind, rain and other factors can increase this force.
The GopherCord spans 300 feet between supports
You allow 2 feet of sag in the middle
By plugging these values into the equation as shown below, you will find that the structure at each end of your range needs to withstand at least 168.75 lbs of horizontal tension.
Practical Considerations
Choose the Right Cord (or Cable): Ensure your tensile strength exceeds the calculated horizontal tension to prevent failure. Our Xtreme system uses an 850# GopherCord which provides a safety factor of 5x.
Secure Anchors: The end points must be able to handle the pulling force without shifting. We offer ratchet straps and stakes to provide additional restraint.
Tensioning Devices: These allow fine adjustments due to wet paracord, and other factors to achieve the correct tension.
Factor in Environmental Conditions: Wind, moisture, temperature changes, and dynamic loads can affect tension, so again - add a safety margin as you plan.
Conclusion
By understanding how to calculate horizontal tension, you can optimize your target system for safety and performance. Use the equation T_H = (W L) / (8 h) to determine the required force, ensuring your paracord is properly tensioned and your installation remains secure.
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