Hoisting — Fleet Angle Check
Fleet Angle Check calculation for hoisting and winching work.
Fleet angle is the silent rope-killer: too steep and the rope scrubs the groove walls coming on and off the drum, glazing wires and piling wraps at one flange. The geometric fix is always distance — the first sheave wants to sit at least 20× the drum width away from a grooved drum.
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.
Fleet Angle Check calculation for hoisting and winching work. A free crane load, wind & rigging safety tool — no sign-up, no upload, instant results in your browser.
About Hoisting — Fleet Angle Check
Hoisting — Fleet Angle Check computes the governing relationship tanθ = offset / distance · limits: ≤1.5° grooved, ≤0.5° smooth drum live as you type. Fleet angle is the silent rope-killer: too steep and the rope scrubs the groove walls coming on and off the drum, glazing wires and piling wraps at one flange. The geometric fix is always distance — the first sheave wants to sit at least 20× the drum width away from a grooved drum. 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 Hoisting — Fleet Angle Check
- 1Enter your values — Drum half-width (worst offset), Drum to first sheave distance (sensible defaults are pre-filled).
- 2Read the live results: Fleet angle.
- 3Check the "with your numbers" line to see tanθ = offset / distance · limits: ≤1.5° grooved, ≤0.5° smooth drum substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Hoisting — Fleet Angle Check?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula tanθ = offset / distance · limits: ≤1.5° grooved, ≤0.5° smooth drum with authoritative sources cited on the page (Wire Rope Technical Board — Wire Rope Users Manual, 4th ed.; ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices)
- ✓Fleet angle is the silent rope-killer: too steep and the rope scrubs the groove walls coming on and off the drum, glazing wires and piling wraps at one flange.
- ✓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 hoisting — fleet angle check use?+
It evaluates tanθ = offset / distance · limits: ≤1.5° grooved, ≤0.5° smooth drum, exactly as published. Sources: Wire Rope Technical Board — Wire Rope Users Manual, 4th ed.; ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices. 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?+
Fleet angle is the silent rope-killer: too steep and the rope scrubs the groove walls coming on and off the drum, glazing wires and piling wraps at one flange. 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?+
Fleet Angle Check calculation for hoisting and winching work. A free crane load, wind & rigging safety tool. The geometric fix is always distance — the first sheave wants to sit at least 20× the drum width away from a grooved drum. 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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