Wind at Hook Height — Open Country Site
Power-law wind speed at crane height for a open country site, with gust estimate and limit check.
The α = 0.14 exponent is the textbook open-terrain profile: at 60 m the wind runs ~28% above the 10 m reading. Greenfield industrial sites and highway jobs live here — the forecast's '10 m wind' is the FLOOR of what the jib experiences, never the value.
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.
Power-law wind speed at crane height for a open country site, with gust estimate and limit check. A free crane load, wind & rigging safety tool — no sign-up, no upload, instant results in your browser.
About Wind at Hook Height — Open Country Site
Wind at Hook Height — Open Country Site computes the governing relationship v(z) = v₁₀ · (z/10)^α [power-law profile] live as you type. The α = 0.14 exponent is the textbook open-terrain profile: at 60 m the wind runs ~28% above the 10 m reading. Greenfield industrial sites and highway jobs live here — the forecast's '10 m wind' is the FLOOR of what the jib experiences, never the value. 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 Wind at Hook Height — Open Country Site
- 1Enter your values — Reference wind at 10 m, Hook/jib height, Terrain exponent α, Gust factor and more (sensible defaults are pre-filled).
- 2Read the live results: Mean wind at height, Gust at height, Amplification vs 10 m.
- 3Check the "with your numbers" line to see v(z) = v₁₀ · (z/10)^α [power-law profile] substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Wind at Hook Height — Open Country Site?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula v(z) = v₁₀ · (z/10)^α [power-law profile] with authoritative sources cited on the page (ASCE 7 — Wind load provisions (power-law profiles); EN 13001 / EN 14439 — Crane design & tower crane standards)
- ✓The α = 0.14 exponent is the textbook open-terrain profile: at 60 m the wind runs ~28% above the 10 m reading.
- ✓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 wind at hook height — open country site use?+
It evaluates v(z) = v₁₀ · (z/10)^α [power-law profile], exactly as published. Sources: ASCE 7 — Wind load provisions (power-law profiles); EN 13001 / EN 14439 — Crane design & tower crane standards. 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?+
The α = 0.14 exponent is the textbook open-terrain profile: at 60 m the wind runs ~28% above the 10 m reading. 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?+
Power-law wind speed at crane height for a open country site, with gust estimate and limit check. A free crane load, wind & rigging safety tool. Greenfield industrial sites and highway jobs live here — the forecast's '10 m wind' is the FLOOR of what the jib experiences, never the value. 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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