Transcript P

The Shade Tree Kings
Connor, Anthony, Randy, and Shin
Equations Involved
• KE=1/2*m*v^2
Input
• P=1/2*rho*A*V^3=0.55 Watts
Output
• P=V*I=1.7*0.1=0.17 Watts
Efficiency= 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
Resolutions
Zip 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- $20.00
In total we estimate our cost to be about $37.00