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Wind Blade Chord: Solidity and Section Force

Calculate local blade chord from solidity, or invert a stated section-normal load using actual relative flow and airfoil coefficients with clear limits.

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Inputs that matter
Rotor outer radius (m), Radial station from axis (m), Whole blade count, Entered local solidity (%), and 9 more
Output to expect
Chord from local blade solidity, Blade-section chord for a normal-load target
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Chord from local blade solidity

Calculate blade chord at an actual radial station from an entered local annular solidity and whole blade count. Local solidity is a design input, not derived from TSR by a universal rule.

Local solidity = blade count × chord /(2π × station radius); chord = local solidity ×2πr / blade count.

Blade-section chord for a normal-load target

Solve a local chord from a stated per-blade normal force per unit span, relative flow speed and actual airfoil coefficients. Report the corresponding tangential load and geometric twist from explicitly supplied angles.

Cn = Cl cosφ + Cd sinφ; normal N/m = 0.5ρVrel² × chord × Cn; twist = inflow angle − target angle of attack − collective pitch.

Updated: September 2026

Example Scenarios

Try this example to see the calculation, then enter actual documented values and preserve the measurement conditions. A failed or unresolved comparison is part of the record.

→ 1.570796 m local chord

Try this example to see the calculation, then enter actual documented values and preserve the measurement conditions. A failed or unresolved comparison is part of the record.

→ 1.034326 m section chord

FAQ

Calculate blade chord at an actual radial station from an entered local annular solidity and whole blade count. Local solidity is a design input, not derived from TSR by a universal rule. Solve a local chord from a stated per-blade normal force per unit span, relative flow speed and actual airfoil coefficients. Report the corresponding tangential load and geometric twist from explicitly supplied angles.

Use the exact equipment data, measurement point, operating conditions and units described in the selected mode. Record source documents, dates and unresolved conditions in Sources and assumptions. Built-in examples illustrate arithmetic; they are not manufacturer ratings or approved designs.

Use Save planning case for an explicit local history entry. Copy MD keeps current inputs and notes; Download CSV exports the result breakdown. Export portable copies before clearing storage and save a separate case after changing equipment, conditions or measurements.

About Wind Blade Chord: Solidity and Section Force

Calculate blade chord at an actual radial station from an entered local annular solidity and whole blade count. Local solidity is a design input, not derived from TSR by a universal rule. Solve a local chord from a stated per-blade normal force per unit span, relative flow speed and actual airfoil coefficients. Report the corresponding tangential load and geometric twist from explicitly supplied angles.