VetusOnline Thruster Calculator (wind-based)
Calculates required thrust (kgf) from wind load and lists suitable VETUS thrusters. We highlight the best match per thruster group.
Inputs
Thruster position
For stern thrusters we use waterline length as lever arm (B).
System voltage
Filter thrusters by nominal system voltage.
Boat length (m)
Overall boat length (used for A = 0.5 × boat length).
Waterline length (m)
Used as lever arm B for stern thrusters: F = T / B.
Distance from aft (transom) → tunnel center (m)
Used as lever arm B for bow thrusters: F = T / B.
Wind area above waterline (m²)
Projected side area affected by wind.
Wind input
Switch between m/s and Beaufort. Calculation uses m/s internally.
Wind speed (m/s)
Example: 8.0 m/s ≈ Beaufort 5.
Reduction factor (streamlining)
Typical rule-of-thumb: 0.75.
Thruster group filter
Optional: narrow down the displayed groups.
What the tool does
Wind pressure: p = 0.613 × V² (N/m²)
Wind force: Fw = p × Area × reduction
Turning moment: T = Fw × A (A = 0.5 × boat length)
Required thrust: F = T / B (B depends on bow/stern selection)
Bow: B = distance from aft (transom) → bow tunnel center. Stern: B = waterline length.
Important (vejledende): This calculation is guidance only. If the tool cannot calculate a clear result, or if you are in doubt about the inputs or the recommendation, please contact support.