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Why Boats Float

Why Boats Float. Haul Design and Stability. Archimedes. Archimedes (287? -212B.C.).

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Why Boats Float

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  1. Why Boats Float Haul Design and Stability

  2. Archimedes

  3. Archimedes (287? -212B.C.) • Archimedes is considered one of the three greatest mathematicians of all time along with Newton and Gauss. In his own time, he was known as "the great geometer" and his works and inventions brought him fame that lasts to this very day. He was one of the last great Greek mathematicians.

  4. Archimedes Principle • when an object is partially or fully submerged, the buoyant force, or apparent loss in weight, is equal to the weight of the fluid displaced.

  5. Why Do Heavy Boats Float

  6. Boat Stability

  7. Bad Boat Stability

  8. Different haul Designs • Mono Haul • Catamaran • Mono Haul Sailboat • Hydrofoil • Airboat or Flat Bottom • Hover Craft

  9. Mono Haul Boats

  10. Mono HaulBoats • Mono-Haul boats are single hauled “mono” and are the most common design. Used in most recreational vessels and sail boats. • The reason this haul design is so common is it one of the oldest designs and is very efficient in transporting both passenger and goods.

  11. Catamarans • Catamarans- are a dual hauled vessel commonly wind powered but can be powered by a combustion engines

  12. Benefits of Catamarans The benefits of catamarans is that the wider stance of a catamaran allows for more stability and smaller volume hauls cause less drag and allow for greater speeds

  13. Sailboats • Sailboats are commonly a mono-haul boat but can be found in bi and tri-haul designs. • Sailboats have been used for a long time do to there efficient use of the wind to power them. • Do to the use of the wind and the common mono-haul design sailboats make use of a long heavy rudder like piece in the center of the haul called the keel.

  14. Hydrofoil

  15. Hydrofoil Design • Hydrofoils are superior to conventional haul design in the fact that the haul it self is out of the water while the vessel is in motion. • The vessel is lifted out of the water with the use of the foil which is a wing under the water that acts like an airplane wing in the idea of Bernoulli’s Principle and creates lift with a low pressure on the top side creating a high pressure below.

  16. Air Boat or Flat Bottom

  17. Airboats • Airboats are designed with a wide flat bottom so that there is very little drag. Also so that very little of the haul is submerged. • The Benefit of this design is that the boat is capable of going virtually any where with a little bit of cushion as shown. • The negative aspect of the airboat is that there is very little steering capability do to neither haul nor prop are in the water.

  18. Hovercraft

  19. Hovercraft • Hovercrafts are much like air boats in that the have very little steering ability and that little of the haul is in the water. • On the hovercraft the haul would be the skirt/air. This would be considered superior to the traditional haul because it does not require water to be displaced for the air makes up the distance.

  20. Reference • http://www.boatsafe.com/kids/021598kidsques.htm • http://www.spartechsoftware.com/reeko/ScienceTips/SciTipFloatation.htm

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