Use this sailing calculation as a planning or educational cross-check for navigation, wind and current, rig loads, stability, anchoring, tides, visibility, performance, or recovery under explicitly stated conditions.

Deck angle (deg)

Angle between the load direction and the deck.

Forestay load (N)

Tensile load in the forestay.

Compute the ideal axial compression required to balance a forestay load at a specified angle to the deck. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Bowsprit compression (N)

Compressive force along the bowsprit.

• Actual conditions change with vessel design and loading, sea state, wind, current, tide datum, weather, chart accuracy, equipment, crew, regulations, and safety margins. Simplified formulas do not replace seamanship, approved stability data, or current navigation information.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Cross-check official charts, tide and weather services, instrument data, vessel manuals, and collision regulations; maintain conservative margins and a safe alternative plan.

• Boom Force Calculator

  Compute the compression force on the boom from sheet tension via torque balance about the gooseneck.

• Rudder Correction Angle Calculator

  Compute the rudder correction angle from correctionDeg = degrees(atan(lateralDriftMs / forwardSpeedMs)).

• Jib Sheet Load Calculator

  Estimate the jib sheet load from dynamic pressure on the sail area divided by the sine of the sheet angle.