The Displacement-Length Ratio calculator computes a metric to describe how heavy a boat is in relation to its waterline.
INSTRUCTIONS: Choose units and enter the following:
- (D) Boat Displacement
- (L) Waterline Length
Displacement-Length Ratio(DLR): The calculator returns the ratio as a real numbers.
DLR Indications
- Under 90 - Ultralight
- 90 to 180 - Light
- 180 to 270 - Moderate
- 270 to 360 - Heavy
- 360 and up - Ultraheavy
The Math / Science
The formula used for the Displacement-Length Ratio use in this calculator is:
DLR = `(D "/" 2240) / (0.01 * L)^3`
where:
- DLR = Displacement-Length Ratio
- L = Waterline Length in feet
- D = Displacement of Boat in pounds
Displacement
Displacement, in the context of a boat or a ship, refers to the weight of the volume of water that the vessel displaces when it is floating in the water. It is essentially the weight of the water that is "moved aside" by the hull of the boat when it is floating or submerged in water. Displacement is typically measured in tons (or tonnes) or in pounds (or kilograms) depending on the size and type of vessel.
Types of Displacement:
- Light Displacement: The weight of the boat without any cargo, fuel, crew, or provisions.
- Normal Displacement: The weight of the boat fully loaded with crew, fuel, cargo, and provisions.
- Loaded Displacement: Similar to normal displacement, but also including the weight of additional equipment, stores, and water.
Displacement is important because it affects the boat's buoyancy (ability to float), stability, and overall performance in the water. It is a crucial factor in determining a vessel's design, capabilities, and seaworthiness.
Displacement can be calculated using various methods, including direct measurement (placing the boat in water and measuring the volume of water displaced) or through more complex calculations involving the boat's dimensions and hull shape.
Displacement in boating refers to the weight of the water displaced by the boat's hull when it is floating or submerged, and it plays a significant role in determining many aspects of a vessel's design and operation.
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