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=.00123 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