The Shade Tree Kings

Connor, Anthony, Randy, and Shin

Equations Involved

• KE=1/2*m*v^2Input• P=1/2*rho*A*V^3=0.55 WattsOutput• P=V*I=1.7*0.1=0.17 WattsEfficiency= 0.17/0.55=0.31 or 31%

The Initial Design

• Spoons for the blades of the fan• Dowel rod glued to the fan• Magnets glued to the dowel rod that rotated

inside coiled copper wire• Duct to funnel the air directly into the blades

of the fan

Complications

• Spoons were not angled in the correct position, causing negative torque

• Needed a way to “hang” the copper wire around the magnets without interfering with the rotating dowel rod

• Generator did not have enough coiled wire or magnetic strength

• Fan caused a lot of oscillation because of its imbalance of weight and was not perfectly aligned

• Duct did not funnel the air as intended

ResolutionsZip Ties, and Super Glue, and More Zip Ties and Super Glue

• Used zip ties, wood, and PVC pipe to develop a new fan

• Zip tied and screwed to secure the generator onto the end of the PVC pipe

• Glued pipe into the base to secure the fan, lowering the imbalance of force from the weight of the fan

• Glued wood and screwed down the top of the housing to lower the oscillations

• Found and/or bought stronger and lighter magnets• Added more coiled wire to the generator

Costs

• PVC pipe- $1.00• Bearings- $3.00• Magnets- $6.00• Wood (dowel rod and base)- $1.00• Zip ties- $2.00• Glue- $3.00• Screws- $1.00• Copper Wire- $20.00In total we estimate our cost to be about $37.00