Wind Turbines - Wind Energy: Renewable Energy and the Environment - page 74

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FIGURE 5.1 Drag device. An example is a sailboat moving downwind.

Plap plate Cup Panemone turbine

Shield

Rotation

Wind

FIGURE 5.2 Diagrams of drag wind turbines.

FIGURE 5.3 Examples of drag devices. Top left, clockwise: (1) Around 10 m diameter, with flywheel that was
suppose to store energy and reduce variation in power; (2) cups, 1.2 m diameter, inventor predicted power output
as 4 kW; (3) panemone device, blades move parallel to wind when moving upwind; (4) shielded plywood sheets,
1.2 by 2.5 m. Notice the large wheel for speed increase to the generator. Inventor predicted output as 4 kW.