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Engineering science fair project:
Which Boat Hull Shape Can Float the Most Weight?

Science Fair Project Information
Title: Which Boat Hull Shape Can Float the Most Weight?
Subject: Engineering
Grade level: Primary School - Grades K-3
Academic Level: Ordinary
Project Type: Experimental
Cost: Low
Awards: 2nd place, Canada Wide Virtual Science Fair (2010)
Affiliation: Canada Wide Virtual Science Fair (VSF)
Year: 2010
Description: Build boats with different hull shapes out of milk cartons and test them with sandbags to see which hull can float the most weight. Sandbags will be added till the boat sinks.
Link: http://www.virtualsciencefair.org/2010/biicxm2
Short Background

Boat Hull

A hull is the watertight body of a ship or boat. Above the hull is the superstructure and/or deckhouse, where present. The line where the hull meets the water surface is called the waterline.

The structure of the hull varies depending on the vessel type. In a typical modern steel ship, the structure consists of watertight and non-tight decks, major transverse and longitudinal members called watertight (and also sometimes non-tight) bulkheads, intermediate members such as girders, stringers and webs, and minor members called ordinary transverse frames, frames, or longitudinals, depending on the structural arrangement. The uppermost continuous deck may be called the "upper deck," "weather deck," "spar deck," "main deck" or simply "deck." The particular name given depends on the context--the type of ship or boat, the arrangement, or even the area where it sails. Not all hulls are decked (for instance a dinghy).

In a typical wooden sailboat, the hull is constructed of wooden planking, supported by transverse frames (often referred to as ribs) and bulkheads, which are further tied together by longitudinal stringers or ceiling. Often but not always there is a centerline longitudinal member called a keel. In fiberglass or composite hulls, the structure may resemble wooden or steel vessels to some extent, or be of a monocoque arrangement. In many cases, composite hulls are built by sandwiching thin fiber-reinforced skins over a lightweight but reasonably rigid core of foam, balsa wood, impregnated paper honeycomb or other material.

The shape of the hull is entirely dependent upon the needs of the design. Shapes range from a nearly perfect box in the case of scow barges, to a needle-sharp surface of revolution in the case of a racing multihull sailboat. The shape is chosen to strike a balance between cost, hydrostatic considerations (accommodation, load carrying and stability) and hydrodynamics (speed, power requirements, and motion and behavior in a seaway).

See also: http://en.wikipedia.org/wiki/Hull_(watercraft)

Source: Wikipedia (All text is available under the terms of the GNU Free Documentation License and Creative Commons Attribution-ShareAlike License.)

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