Engineering Fundamentals 152 DOROTHY Engineering Fundamentals 152

Cash Money Garrett Smith Tristan Crawley Jordan Rudolph Matt Bishop

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

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

Estimated Efficiency Wind Power P = 0.5 x rho x A x V3 P = 0.5 x 1.225 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 1.225 kg/m3 x 2.5 m2 x (1.7 m/s)3 x .25 x .25 P = 0.677 Watts Efficiency n = Pf / Pi x 100 n = 0.677 W / 7.52 W x 100 n = 9.00 %

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

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