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Harnessing Wind Energy. Kevin Dahm July 9, 2007. Sailboats. The sail dates back to at least 4000 B.C., when Egyptians developed square papyrus sails. ACTIVITY. Using the materials provided, design and construct a sail that will power the raft.

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## Harnessing Wind Energy

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**Harnessing Wind Energy**Kevin Dahm July 9, 2007**Sailboats**The sail dates back to at least 4000 B.C., when Egyptians developed square papyrus sails**ACTIVITY**• 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.**ACTIVITY**• 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. • This activity is taken from an Engineering is Elementary module, “Catching the Wind.”**Dates to at least 900 AD**Dates to at least 400 BC**Question**What kind of engineering is this? Discuss with neighbors for 30 seconds.**Cape Wind**Why would anyone think this is a bad idea?**Cape Wind Critics**• Aesthetics**Cape Wind Critics**• Aesthetics • Navigation hazard • Air traffic hazard (each turbine is taller than the statue of liberty) • Create false radar signals**Cape Wind Critics**• Aesthetics • Navigation hazard • Air traffic hazard (each turbine is taller than the statue of liberty) • Create false radar signals • Local environmental impact • Birds • Fish**Take home messages**• Multiple solutions to any problem • Engineering practice: Predict, design, build, test, improve • Don’t fall in love with your first idea!**Mechanical Engineers design and produce machines that**perform specific tasksElectrical Engineers design systems that generate, deliver and use electricityCivil Engineers design and oversee construction of society’s infrastructure**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

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