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Anchor Swinging Circle Formula:
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The Anchor Swinging Circle Formula calculates the radius of the circle a vessel will swing around its anchor based on chain length and water depth. This is crucial for determining safe anchoring distances and avoiding collisions with other vessels or obstacles.
The calculator uses the anchor swinging circle formula:
Where:
Explanation: The formula accounts for the catenary curve of the anchor chain and the geometry of vessel movement around the anchor point.
Details: Accurate swinging circle calculation is essential for safe anchoring operations, ensuring adequate clearance from other vessels, shorelines, and underwater hazards. It helps prevent dragging anchor incidents and collisions.
Tips: Enter chain length and water depth in meters. Both values must be positive, and chain length must be greater than water depth for the calculation to be valid.
Q1: Why is chain length minus water depth divided by 2?
A: This accounts for the geometry of the swinging motion and the catenary curve of the anchor chain, providing a practical estimate of the vessel's turning radius.
Q2: What is a typical scope ratio for anchoring?
A: A scope of 5:1 to 7:1 (chain length to water depth ratio) is commonly recommended for good holding power in normal conditions.
Q3: Does this formula account for tidal changes?
A: No, this is a static calculation. For tidal areas, use the highest expected water depth during the anchoring period.
Q4: How does wind affect the swinging circle?
A: Strong winds can increase the swinging circle as the vessel is pushed further from the anchor point. Additional safety margin should be added in windy conditions.
Q5: Is this formula suitable for all vessel types?
A: While the formula provides a good estimate for most vessels, high-windage vessels or those with significant current may experience different swinging characteristics.