##### Child pages
• Wind Blade Analysis for Wind Power - Geometry

# Page History

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• Sketch tab: There is a separate Sketch tab and a new End Sketch button. All the sketching tools are now under the Sketch tab and you need to select the End Sketch button when you are done with the sketch. You should be able to figure it out by poking around.

• Sketching the chord at blade tip: You can skip the part of the video that involves sketching the chord at the blade tip (1:10-2:30) since you may have trouble snapping to the leading edge of the blade when sketching. This is done to determine the angle between the rotation plane and the chord at the blade tip. The video tells you what the angle is; it is -1.06 degrees.

• Rotation to get right pitch angle: In order determine zero out the total pitch angle you must rotate the blade -1.06 degrees as shown in the video. In order to get a desired blade pitch at angle from the tip, use the expression

LaTeX Formatting
$$\theta = \alpha - 1.06$$

where theta is the number of degrees you must rotate the blade, and alpha is the desired pitch angle. Alpha should be negative zero position, rotate the blade in the negative direction for positive pitch angles, and in the positive direction for negative pitch angles (this . This is to remain consistent with the way the rotations were defined in the videos, where theta was a negative angle).

HTML
<iframe width="560" height="315" src="https://www.youtube.com/embed/di64pJ4U1Kc" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

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