For monohulls, BWL is the quantity of interest. Wider beam implies greater form stability, within a given family of hulls. All other things being equal, the hull with more form stability will be less tender and better able to stand up to a powerful sail plan. Making a hull wider, though, will generally increase wave-making resistance, and often increases wetted surface area- thus increasing frictional resistance. Finding the right trade-off is one of those "no right answer" optimization problems that make good design tricky.

Length and beamfor boat

Multihull performance depends on both BWL and BCL. The former contributes to the resistance; the latter contributes to the multihull's righting moment and therefore its sail-carrying power.

Beamof a ship

The secant CTE is typically used as input for thermal expansion, but the instantaneous CTE is also available as input in Workbench Engineering Data, in case users may have material data in instantaneous CTE form. Please keep in mind that temperature-depedent secant CTE requires a reference temperature from which thermal strain is calculated. On the other hand, temperature-dependent instantaneous CTE does not require this additional information for the material definition (although a reference temperature is still needed in Mechanical to calculate thermal strains properly). Because of this reason, temperature-dependent CTE is sometimes published in instantaneous form.

Idealbeamtolengthratio

Beam refers to the width of a boat. As with length, there are a few ways to define beam, depending on what you need the number for.

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Length and beamin meters

In practical terms, the secant CTE ("alpha") is the measure of the thermal strain due to a change in temperature from the reference temperature to the current temperature. This value is typically used directly when we calculate thermal strains: thermal_strain = alpha * (current_temp - reference_temp) On the other hand, the instantaneous CTE represents the thermal strain generated due to an infinitesimal change in temperature around the current temperature. This quantity needs to be integrated with respect to temperature to calculate the thermal strains.

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Length and beamcalculator

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Shipbeam anddraft

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Length and beamformula

If we plot thermal strain vs. temperature on a graph (origin represents zero thermal strain at the reference temperature), the secant CTE represents the linear slope from the reference temperature. The instantaneous CTE, however, is the slope of the curve at the temperature of interest.

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Length and beamchart

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BWL is, once again, the appropriate quantity to compare. Since a powerboat doesn't need to stand up to a full press of sail, initial stability (due mainly to form stability, or hull shape) is more a matter of preference- although there are long-standing guidelines for what works well in a given situation.

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The width of the waterplane when the boat is loaded to the design waterline shown on the plans. On multihulls, BWL refers to the waterplane width of a single hull.

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See Section 3.5 "Thermal Expansion" in the Material Reference of the Mechanical APDL Help for details. Also, refer to Section 2.1.3 "Temperature-Dependent Coefficient of Thermal Expansion" in the Theory Reference of the Mechanical APDL Help for information on temperature-dependent CTE.

Beam overall is the most commonly used description of a boat's width. It gives some indication of how spacious the interior will be, and how wide a slip needs to be to accommodate the boat. BOA, plus a comfortable margin, is the dimension used when determining whether the boat can pass through a canal or fit in a slip.

If a hull is capable of planing, BWL becomes a very important factor. A wider running surface gives more planing lift, but also presents more area for the hull to pound on when bashing through waves.