1. Transportation Engineering Spring 2013 Mr. Joel Bischoff

2. How does a boat float? Buoyancy the tendency of a body to float or to rise when submerged in a fluid the power of a fluid to exert an upward force on a body placed in it; also: the upward force exerted

3. Buoyancy vs. Displacement Displacement the volume or weight of a fluid (as water) displaced by a floating body (as a ship) of equal weight In short, buoyancy = the weight of displaced fluid This also hold true for submerged objects

4. What are the parts of a boat?

5. What are the directions on a boat?

6. Hull Designs 2 Different categories Displacement designed to move through the water with a minimum of propulsion. They will have a large underwater profile and will ride comfortably although slowly. Trawlers and large sailboats are displacement watercraft Planing designed to actually rise up and ride on top of the water when power is applied. They require considerably more horsepower to get the boat up but they can attain much higher speeds from the reduced friction of moving on top of the water rather than through the water

7. Hull Designs Flat bottom Very stable in calm water Flat, broad bow makes a rough ride at higher speeds, therefore they handle poorly the faster they go

8. Hull Designs Vee/ Deep Vee/ Modified Vee The "V"-bottom boat is probably the most common hull design. Most manufacturers of boats built today use modifications of this design. This design offers a good ride in rough water as the pointed bow slices forward and the "V"-shaped bottom softens the up-and- down movement of the boat. The degree of the angle of the "V" is called "deadrise." As the "V" shape extends to the back of the boat, it usually flattens out until it all but disappears at the transom

9. Hull Designs Catamaran 2 Hulls that are joined together by some type of structure or frame Pontoon boat a flat, raised deck supported with two outer hulls (pontoons) that are usually constructed of aluminum