Jib Car Position Calculator
Compute a jib-car reference position as a selected percentage of foot length, measured aft of the clew. Final trim still depends on clew height and sheeting geometry.
Description
Compute a jib-car reference position as a selected percentage of foot length, measured aft of the clew. Final trim still depends on clew height and sheeting geometry.
Jib Car Position Calculator: Compute a jib-car reference position as a selected percentage of foot length, measured aft of the clew. Final trim still depends on clew height and sheeting geometry.
When to use Jib Car Position
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.
- Jib foot length (m)
- Foot length of the jib from tack to clew.
- Lead percentage (%)
- Distance of the lead aft of the clew as a percentage of the foot length.
How Jib Car Position works
Compute a jib-car reference position as a selected percentage of foot length, measured aft of the clew. Final trim still depends on clew height and sheeting geometry. 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
- Car position (cm)
- Car position aft of the clew in centimeters.
Limitations and assumptions
- 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.
Alternative or Complementary approaches
Cross-check official charts, tide and weather services, instrument data, vessel manuals, and collision regulations; maintain conservative margins and a safe alternative plan.
References
-
Rig (sailing) — Wikipedia contributors
Similar or alternative tools
- Air Draft With Heel
Estimate effective air draft while heeled using a simplified rotation about the lower rail. Actual clearance also depends on hull geometry, trim, waves, and the heel pivot.
- Quickstop Return Course
Calculate the reciprocal of the course at a man-overboard incident as a planning reference for the return leg. The actual Quickstop maneuver and final approach depend on wind, sea room, and the casualty's observed position.
- Lead Percentage Calculator
Compute sail lead as leadPercent = centroidDistanceMeters / waterlineLengthMeters * 100; signed distances allow the centroid to fall aft of the reference.