Assertion: fan | /r/CapableOf | flatten out at given rpm
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text: The fan’s overall build (blade contour and spacing, etc.) is calculated such that the fan will tend to flatten out at a given RPM; as this threshhold is approached, turbulence at the blade edges makes noise, and the blade then begins to flatten, which reduces air resistance, which causes the blade to curl, which increases air resistance, which causes the blade to flatten, which reduces air resistance, etc.