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The Most Efficient Boat Hull at Varying Water Speeds

Lauren Casulli. The Most Efficient Boat Hull at Varying Water Speeds. Question . Which boat hull is the most efficient at different water speeds?. Purpose . The purpose of this experiment was to determine the most efficient boat hull. Background Information.

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The Most Efficient Boat Hull at Varying Water Speeds

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  1. Lauren Casulli The Most Efficient Boat Hull at Varying Water Speeds

  2. Question Which boat hull is the most efficient at different water speeds?

  3. Purpose The purpose of this experiment was to determine the most efficient boat hull.

  4. Background Information • There are five main hull shapes in use today: • Flat Bottom • Catamaran • V Bottom • Tri Hull • Pontoon

  5. Hypothesis The most efficient boat hull at any speed is the tri-hull because the air tunnels reduce drag.

  6. Materials • Wood (3.6m) • Water pump • Dual Force Sensor • Trough • Band saw, table saw, drill, sander • Eye hooks (4) • String • Copper pipe • Tygon tubing • Ball valve • Pipe clamps

  7. Procedure • Draw outlines of top view and side view of boat • Cut wood • Sand and finalize shape • Attach force sensor to one end of trough • Attach eye hooks to bow of boat, connect string from boat to sensor • Fill trough with water, situating pump. • Turn pump on and allow water speed to reach 0.0318 m/sec, place first boat in trough and record sensor reading for ten seconds. Repeat two more times. • Repeat with other three boats, do not change water speed • Change the water speed to 0.0477 m/sec and measure the force on all four boats with sensor • Repeat at 0.0636 m/sec

  8. Photographs – Pump Configuration

  9. Trough Set Up

  10. Hull Bottoms

  11. Boat Hull Tops Boat Hull Tops

  12. Variables Independent Variables • Water speed • Hull shape Dependent Variables • Force on hulls Control • Raft Constants • Pump • Trough • Sensor • Water speeds

  13. GraphsThe Average Drag of Different Hull Types at a High Speed

  14. The Average Drag of Different Hull Types at a Medium Speed

  15. The Average Drag of Different Hull Types at a Low Speed

  16. Data – High Speed

  17. Medium Speed

  18. Slow Speed

  19. Conclusion The hypothesis was supported as the Tri-Hull consistently had the least amount of resistance at any speed of water. The V-bottom was a close second as the best hull as it had significantly less resistance than the flat bottom and raft. There is almost no significant difference between the V bottom and Tri-Hull.

  20. Significance of Experiment This experiment was significant because it contributed to the idea that one boat hull is the most efficient at any speed of water. But this experiment did not take into account the activity being performed, such as a war-ship versus a fishing boat, as well as the sea state.

  21. Work Cited Know Your Boat. (2003). BoatUS Foundation. Retrieved October 19, 2010, fromBoatUS Foundation website: http://www.boatus.org/onlinecourse/reviewpages/boatusf/ project/section1.htm ZidockJr, A. (1999, July/August). Boat Hull Design. Retrieved September/ October, 2010, from Commonwealth of Pennsylvania Fish and Boat Commission website: http:// www.fish.state.pa.us/anglerboater/1999/julaug99/boathull.htm

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