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Wind Tip-Speed Ratio and Target Rotor RPM

Calculate operating tip speed and tip-speed ratio, or convert an entered target ratio to rotor RPM without assuming a universal optimum range.

Use this result well

Inputs that matter
Rotor diameter (m), Wind speed at rotor (m/s), Rotor rotational speed (RPM), Sources and assumptions, and 1 more
Output to expect
Operating tip-speed ratio, Rotor RPM for a target TSR
  • 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

Operating tip-speed ratio

Calculate blade-tip speed and TSR from measured rotor RPM, diameter and positive wind speed. A stationary rotor has zero TSR; the acceptable operating range comes from the actual design.

Tip speed = πD × RPM/60; TSR = tip speed / wind speed.

Rotor RPM for a target TSR

Translate a specified design TSR and wind speed into rotor RPM. The target must come from an actual turbine or aerodynamic design basis, not a fixed recommended range.

Rotor RPM = target TSR × wind speed × 60 / (πD).

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.

→ 2.513274 tip-speed ratio

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.

→ 143.239449 rotor RPM

FAQ

Calculate blade-tip speed and TSR from measured rotor RPM, diameter and positive wind speed. A stationary rotor has zero TSR; the acceptable operating range comes from the actual design. Translate a specified design TSR and wind speed into rotor RPM. The target must come from an actual turbine or aerodynamic design basis, not a fixed recommended range.

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 Tip-Speed Ratio and Target Rotor RPM

Calculate blade-tip speed and TSR from measured rotor RPM, diameter and positive wind speed. A stationary rotor has zero TSR; the acceptable operating range comes from the actual design. Translate a specified design TSR and wind speed into rotor RPM. The target must come from an actual turbine or aerodynamic design basis, not a fixed recommended range.