i want to know which geometrical properties are ok to assume for a lifeboat. Im

Question

i want to know which geometrical properties are ok to assume for a lifeboat. Im think the weight of the boat and people acts on the hull of the boat, so I first initially assumed the lifeboat has a hemispherical shape with cross sectional area of halfcircle hollow. is this a safe assumption or should i assume another shape. Im not exactly sure which geomtric shapes are typically used for stress calculations or deriving material indexs for boats. You dont have to derive any formulas for me i just want to know what is a good assumption an engineer would make to derive a material index or do stress calculations on this shape of the lifeboat. What cross sectional area, volume, is safe to assume? Do engineers typically model boats like this as a certain shape for stress calculations for ease of calculations?

Explanation / Answer

For boat to sail, the buoyant force acting on the boat should be high. For that, it should displace a lot of water. Or its surface area (wetting area) should be as high as possible. Therefore, the circular section would not be the best. It should be more flatter.

Also, boat's weight should be as low as possible. So the material chosen should have low density (wood, aluminium etc.).

For stresses, we need to see the forces acting on the boat. The thrust force would be acting at the leading edge. At turnings, a lot of awater force would act on the side surfaces. So those are the areas which you would like to strengthen.

Hope this helps.

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