Category B1 Readiness Check

Explanation

Because the rotational speed of a blade section increases with radius, the resultant airflow angle changes from root to tip. Twisting the blade so the blade angle reduces toward the tip keeps the angle of attack roughly constant along the span, giving efficient, even aerodynamic loading rather than a single uniform blade angle.

Every one of 17,000+ Part66 questions is explained like this — included with a subscription.