Sling Tension — Tagline Control Force
Tagline force needed to stop a suspended load rotating in wind, with the human-control check.
A tagline's job is fighting wind torque on a hanging load — the force needed is the wind force times the lever ratio of pressure centre to attachment. Past roughly 200–250 N of sustained pull a human can't control it; that's the threshold where the lift waits for calmer air.
Formula
Note: Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
Tagline force needed to stop a suspended load rotating in wind, with the human-control check. A free crane load, wind & rigging safety tool — no sign-up, no upload, instant results in your browser.
About Sling Tension — Tagline Control Force
Sling Tension — Tagline Control Force computes the governing relationship F_tag = F_wind × r_pressure / r_tagline live as you type. A tagline's job is fighting wind torque on a hanging load — the force needed is the wind force times the lever ratio of pressure centre to attachment. Past roughly 200–250 N of sustained pull a human can't control it; that's the threshold where the lift waits for calmer air. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Sling Tension — Tagline Control Force
- 1Enter your values — Wind force on load, Wind pressure centre to hook axis, Tagline attachment to hook axis (sensible defaults are pre-filled).
- 2Read the live results: Tagline force needed.
- 3Check the "with your numbers" line to see F_tag = F_wind × r_pressure / r_tagline substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Sling Tension — Tagline Control Force?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula F_tag = F_wind × r_pressure / r_tagline with authoritative sources cited on the page (ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices; Wire Rope Technical Board — Wire Rope Users Manual, 4th ed.)
- ✓A tagline's job is fighting wind torque on a hanging load — the force needed is the wind force times the lever ratio of pressure centre to attachment.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the sling tension — tagline control force use?+
It evaluates F_tag = F_wind × r_pressure / r_tagline, exactly as published. Sources: ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices; Wire Rope Technical Board — Wire Rope Users Manual, 4th ed.. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
A tagline's job is fighting wind torque on a hanging load — the force needed is the wind force times the lever ratio of pressure centre to attachment. Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
When is this calculator the right tool for the job?+
Tagline force needed to stop a suspended load rotating in wind, with the human-control check. A free crane load, wind & rigging safety tool. Past roughly 200–250 N of sustained pull a human can't control it; that's the threshold where the lift waits for calmer air. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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