Helical Strakes Vortex Suppression Calculator

Aerodynamic VIV Suppression: Sizing Scruton 3-start helical strakes (pitch, height, coverage) and estimating drag penalty for circular chimneys and towers.

Chimney & Strake Geometry

Cylinder Outer Diameter $D$ (m):

Stack Height $H$ (m):

Strake Height Ratio ($h/D$):

Pitch Ratio ($P/D$):

Top Coverage Fraction:

Design Wind Speed $V$ (m/s):

Strake Sizing & Aerodynamic Impact

Strake Height ($h$)

-- mm

Helix Pitch ($P$)

-- m

VIV Reduction

-- %

Straked Drag $C_D$

Mechanical & Drag Sizing

• Straked Length on Top: -- m

• Helix Starts: 3-start at 120° spacing

• Helix Angle to Horizontal: -- °

• Added Wind Drag Force on Straked Section: -- kN

Recommended Tools & Equipment

Tested hardware and components for high reliability

100% Free Tool Zero Sign-Up

Helical Strakes Vortex Suppression Calculator

Chimney & Strake Geometry

Strake Sizing & Aerodynamic Impact

Mechanical & Drag Sizing

Frequently Asked Questions