1. A modern multi-bladed windmill design is adapted to work in a tidal flow. When the water flows at 5 m/s, find the maximum power generated for a diameter of 4 m. Calculate the tip speed, and determine if cavitation could be a problem.
2. An American farm windmill is used to pump water from a 100 f t deep well through clean plastic pipe of 2 in. diameter. If the rotor diameter is 6 f t, estimate the volume flow rate when the winds are blowing at 20 mph. Assume that the windmill is working at peak efficiency, and the pump is 90% efficient. What is the expected flow rate when the wind drops to 15 mph?