Post #203 by sano on the US Policy board

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Or specific density.

There are tables for the marine salvage industry that list the weight of the common materials in objects that required flotation in salt water. We used it to calculate the approximate amount of lift necessary to refloat watercraft from small skiffs to large yachts.

The lift necessary to float a 40'boat varies greatly with the materials that boat contains. The hull might be very heavy, ultralight or nearly buoyant; cement, steel, aluminum, fiberglass, carbon fiber, wood. Maybe there's a steel keel or lead ballast, multiple drive trains?

It's essential to have these factors figured out before getting underway on a salvage job.

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