General Surgery Reports

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Blade Angle

The angle between the chord of a propeller or rotary wing and a plane normal to the axis of rotation, its value varying along the span and decreasing from root to tip due to blade twist. Measurement of blade angle with propeller in vertical plane. Position one blade so as that it's during a horizontal position. Protractor head across concave face of blade at tip and measure pitch angle from 90° and blades at this same spot and check each pitch angle.

The angle the face of the propeller blade makes at any particular place with its plane of rotation. it's also the angle subtended by the chord of the propeller blade with the horizontal plane when the propeller is laid flat on its boss on this horizontal plane, its axis being vertical. The angular difference between the chord of the rotary wing and therefore the plane of rotation. This angle could also be altered by the pilot through movement of the collective lever or through the cyclic control.

The first step is to choose the correct blade angle. Depending on the type of media you are cutting, you will want to change the angle of the blade to optimize the quality of the cut. Without a nice, clean cut, the result will be a graphic that is difficult to weed. The blade angles available vary by manufacturer. The three most common that I see are 30, 45 and 60 degree angles. However, there are angles that fall between these, such as a 37, 54 and even a 57 degree blade. For this blog, I will focus mostly on the 30, 45 and 60.
 

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