1. Harnessing Wind Energy Kevin Dahm July 9, 2007

2. Sailboats The sail dates back to at least 4000 B.C., when Egyptians developed square papyrus sails

3. ACTIVITY Using the materials provided, design and construct a sail that will power the raft. Using the materials provided, design and construct a sail that will power the raft. Try to predict which materials/sizes/shapes will catch the wind most effectively. Try to predict which materials/sizes/shapes will catch the wind most effectively.

4. ACTIVITY Using the materials provided, design and construct a sail that will power the raft. Using the materials provided, design and construct a sail that will power the raft. Try to predict which materials/sizes/shapes will catch the wind most effectively. Try to predict which materials/sizes/shapes will catch the wind most effectively. This activity is taken from an Engineering is Elementary module, “Catching the Wind.” This activity is taken from an Engineering is Elementary module, “Catching the Wind.”

5. Designing Windmills

7. Dates to at least 400 BC Dates to at least 900 AD

8. Modern Energy Systems

9. Question What kind of engineering is this? Discuss with neighbors for 30 seconds.

10. Modern Energy Systems

11. Cape Wind: Wind farm off Cape Cod

12. Cape Wind Why would anyone think this is a bad idea?

13. Cape Wind Critics Aesthetics Aesthetics

14. Cape Wind

15. Cape Wind Critics Aesthetics Aesthetics Navigation hazard Navigation hazard Air traffic hazard (each turbine is taller than the statue of liberty) Air traffic hazard (each turbine is taller than the statue of liberty) Create false radar signals Create false radar signals

16. Cape Wind Critics Aesthetics Aesthetics Navigation hazard Navigation hazard Air traffic hazard (each turbine is taller than the statue of liberty) Air traffic hazard (each turbine is taller than the statue of liberty) Create false radar signals Create false radar signals Local environmental impact Local environmental impact Birds Birds Fish Fish

17. Take home messages Multiple solutions to any problem Multiple solutions to any problem Engineering practice: Predict, design, build, test, improve Engineering practice: Predict, design, build, test, improve Don’t fall in love with your first idea! Don’t fall in love with your first idea!

18. Mechanical Engineers design and produce machines that perform specific tasks Electrical Engineers design systems that generate, deliver and use electricity Civil Engineers design and oversee construction of society’s infrastructure

19. Linkage to math: Use stopwatch to determine rate at which different sailboats are moving Linkage to societal issues: Solutions to technical problems must be efficient, economical and effective in a societal/global context