the shade tree kings
Post on 23-Feb-2016
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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
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