The birdies sit on a universal joint and thus will point in the direction of the relative wind.
12.
The relative wind aspect dramatically limits the maximum power that can be extracted by a drag-based wind turbine.
13.
When that helicopter is hovering, the blades see the same 300 km / h relative wind throughout their rotation.
14.
W " is the relative wind as experienced by the wind turbine blade, and " A " is the area.
15.
For flying a sit, the feet are oriented toward the relative wind and 90-degree bends maintained at the knees, hips, and shoulders.
16.
As the vehicle accelerates to a speed equal to that of the wind-there is a point when there is zero relative wind-speed.
17.
Which type forms depends on the instability and relative wind conditions at different layers of the atmosphere ( " wind shear " ).
18.
This forward velocity component allows for a reduction in the rate of rotation to maintain the necessary sixty-mile-per-hour relative wind over the wings.
19.
As the body rotates relative to direction of the relative wind, these components change, even when there is no net change in speed.
20.
When the rate of rotation ( in the two ton slingload Cyclocrane ) reaches thirteen revolutions per minute the relative wind over the wings, is sixty-miles-per-hour.
