1. Revolutionary Technologies Group C1 Nicholas Arch, Nicholas Fraser, Robert Huth, Patrick Noble, Michael Toomey Preliminary Design Review February 7, 2008

2. Last Week’s Action Items  Decide between horizontal-axis and vertical-axis wind turbine Options: Lift-Based Vertical, Drag-Based Vertical, Traditional Horizontal Calculate power and torque  Use literature from Dr. Nelson  Complete torque calculations for available generators Analyze generator specifications Explore back-driven DC motor Calculate required torque using given generator

3. Vertical vs. Horizontal  Simplicity vs. Efficiency  Drag vs. Lift based designs  Varying wind conditions  Immediate weather response

4. Generator Selection  Basic torque requirement calculations  Generator vs. DC motor Generator is designed for constant power Motor is designed for torque

5. Torque Calculations LEGENDrho [kg/m^3]1.2 constantCd12.3 inputCd21.2 calculatedWind Speed [mph]15 importantWind Speed [m/s]6.7056 TSR0.5 d [m]1 h [m]1.2 omega [rad/s]6.7056 rpm64.03376 rps1.067229 V1 [m/s]6.7056 V26.7056 T [Nm]4.451542 P [W]29.85026 gear ratio10 T into gen0.445154 rpm into gen640.3376 Pwind [W]180.9107 wind efficiency0.165 gear efficiency0.8 gen efficiency0.8 Pelec [W]19.10417

6. Current Status of Concept Status of Design Researching to decide best HAWT design Focus on: blade geometry shaft geometry wind shield counter rotating blades

7. Next Week’s Action Items  Individual Trade Study Proposal Finalize trade study assignments Perform Research to select design variables and tools to be used in the trade study  Complete Certification on tools Michael Toomey will get CNC certified Rob Huth will get Mill and Lathe certified

8. Thank You Questions?