Why to study the velocity triangle for fan, turbine etc.?

Velocity triangle is used to arrive at the detail fabrication drawing of the blade

Ref: http://nptel.ac.in/courses/Webcourse-contents/IIT-KANPUR/machine/ui/Course_home-lec39.htm

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Is strength, a material or geometric property?

Strength is a geometric property.

Ref: http://www.matweb.com/reference/images/TensileStrength.gif

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