A wind pump based on the “American farm windmill” design Figures 30.2(b)

 and 30.7

with rotor diameter 4.5 m and tip-speed ratio λ ∼ 1 claims to be able to pump 2400 L/h of water from a depth of 30 m when the wind speed is 4 m/s. Do you think this is possible?

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(b) 0,7 16/27 0.6 0.5 CP(max) 0.4 1/3 0.3 Gmax 0.2 0.1 0.0 4 10 (a) tip speed ratio A = NR/v %3D 0.6 Cp(max) 0.5 high speed 2 or 3 bladed wind turbine 0.4 0.3 Savonius Darrieus 0.2 American -farm windmill, 0.1 0.0 2 5 (b) tip speed ratio A = NR/v power coefficient maximum power coefficient at maximum power axial induction factor