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Chapter 7: MechanIcal and Hydraulic Charactenstics
~18:Whyohl
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In determining the proper height, one must keep in mind not only
the average height of the users, but the height of the littlest as
well! (El Pochote).
generate up to 150 watts. Let’s visualize these values: a child
who generates a force of 40 watts pumping a well that is 10 meters deep will take a little longer than one minute to fill a 20 liter
bucket. An adult man who generates 150 watts can do the
same in 20 seconds. If, on the other hand, the well is 40 meters
deep, the child will have to pump almost five minutes, while the
adult man can do it in a little more than 1—1/2 minutes.
—To generate maximum power, the maximum force exerted
on the pulley wheel crank should be 50 120 Newtons (5
12 kilos). This is if both arms are used.
—To generate maximum power, the maximum turning speed
of the pulley wheel crank should be 0.7 1 revolutIons per
second.
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