Team Pain David Brundage, Kelli Byrne, Adam Watkins, and Benjamin Wing

Key Lime Pie 30-gauge insulated copper wire 30-gauge insulated copper wire 500 turns around a magnet connected to plastic axle 500 turns around a magnet connected to plastic axle 5 fan blades at an angle attached to a wooden pole 5 fan blades at an angle attached to a wooden pole Large gears attached to the wooden pole connect to small gears on the axle with the magnet Large gears attached to the wooden pole connect to small gears on the axle with the magnet

Mechanical Fan blades Fan blades Axel Axel Gear Ratio Gear Ratio Double Gears Double Gears Wind Wind

Electrical Permanent Magnetic field Permanent Magnetic field Induced electrical field Induced electrical field Current Voltage Current Voltage Light Bulb Resistor Light Bulb Resistor

Calculations Estimated Efficiency Estimated Efficiency P = (1/2) (ρ) (A) (v)3 A- rotor swept area (m 2 ) A- rotor swept area (m 2 ) ρ- air density (about kg/m3) ρ- air density (about kg/m3) v- wind velocity (m/s) v- wind velocity (m/s) P- power (watts) P- power (watts) Efficiency= P generated/ Potential P η=[(I)(V)]/[(1/2)(ρ)(A) (v)3] A=pi()*(.25m) 2 = m 2 ρ=1.225 kg/m3 v= 15 mph=6.7056m/s I=.073 A V=3.1 V η = %

Bill of Materials 2 High strength dime magnets ($2.00) 2 High strength dime magnets ($2.00) 30 gauge insulated copper wire ($5.00) 30 gauge insulated copper wire ($5.00) Wood ($3.00) Wood ($3.00) Poster board ($2.00) Poster board ($2.00) Gears ($1.50) Gears ($1.50) Total = $13.50 Total = $13.50

Construction Issues Generator at first didn’t work Generator at first didn’t work Stability and vibration Stability and vibration Housing Structure Housing Structure Crappy nails Crappy nails Inadequate materials Inadequate materials Sarcastic teammates Sarcastic teammates

Conclusions Windmills are a very practical way to harness energy from a natural resource Windmills are a very practical way to harness energy from a natural resource Construction of a windmill from scrap is difficult Construction of a windmill from scrap is difficult