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To provide a thrust. Otherwise they would simply turn round and round. They need to go through the fluid in the manner of screws.

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Q: Why propeller blades are given a geometric twist from root to tip?
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Why is there a twist in a propeller blade?

to keep the angle under which propeller section sees the relative velocity. Because, a propeller essentially is a wing which rotates around an axis parallel to the flight velocity. wings operate best at a certain angle of attack, which is an angle at which wing 'sees' the flow. now, propellers rotate and tangential velocity increases from root to tip. airflow velocity is obviously constant. tangent of angle between relative velocity and prop section is air velocity / tangential velocity. we want angle between propeller section and relative velocity to constant, since tangent changes from root to tip , we need to change angle of propeller section itself.