1. Engineering Fundamentals 152
DOROTHY
Engineering
Fundamentals
152

2. Cash Money
Garrett Smith
Tristan Crawley
Jordan Rudolph
Matt Bishop

3. Overview Windmill constructed from PVC pipe Aluminum Can “Flaps”
Gear Driven through K’NEX pieces
Wood box construction
Funnel for stabilization
Hot Glue essential

4. Mechanical and Electrical Aspects
Harness wind energy
Translates into rotational motion
Gear transferred
Rotational energy conveyed to magnets
Electrical
Electricity powers fan
Magnet rotation produces current through wire

5. Estimated Efficiency
Wind Power P = 0.5 x rho x A x V3 P = 0.5 x kg/m3 x 2.5 m2 x (1.7m/s)3 P = 7.52 Watts Wind Turbine Power P = 0.5 x rho x A x Cp x V3 x Ng x Nb P = 0.5 x kg/m3 x 2.5 m2 x (1.7 m/s)3 x .25 x .25 P = Watts Efficiency n = Pf / Pi x 100 n = W / 7.52 W x 100 n = 9.00 %

6. Design / Construction Issues
Support for Windmill
How many flaps?
Cardboard vs. Wood
Placement
Friction in Gearing
Materials vs. Cost

7. Conclusions Great design process Team work Effective use of time
Flexible
Communication
Hard work