Ryan Ray Ridley Shetler Reuben Robertson Cassie Clarke

 Design and build a windmill that will generate electricity.  Make a simple system that works without complications.  Make generator and windmill run efficiently with consistent results  Use readily available materials

 Coils and magnets did not line up easily  Material issues  Gear needed too much initial torque to begin spinning  Chain was too heavy

 Modifications to casing  Reducing friction  Creating more power  Turbine Attachment

 Construction  Vertical Axis Wind Turbine (VAWT)  Advantages  Disadvantages

 P=.5*p*A*Cp*V*Ng*Nb  p=air density for Knoxville~1.164kg/m^3  A=rotor area exposed to wind~.330m^2  Cp=coefficient of performance~.59 for max  V=wind speed ~1.7 m/s  Ng=generator efficiency~25%  Nb=bearing/gear efficiency~55%  Theoretical=.0265 volts  Actual= volts  4.64% efficient

 2 ft of Wire--$1  5 Arizona cans--$.25  26 Magnets--$24  11 Nails-$.55  5 Wire hangers--$.50  2 Two-liters--$.50  Blender part--$2  1 metal turn buckle--$2  3 Skateboard bearings--$6  Salvaged Wood --$3  TOTAL COST: $39.80

 Produced electricity  Low efficiency  Design setbacks  Possible Improvements  How electricity is created