Difference between Helix and Blade angle?!?!?

[AlexanderH]

Bit stuck with this one. Pooley's book explanation is difficult to understand. Can anyone explain this to me in plain English?

[Keith.Williams.]

Blade Angle is between the chordline and the plane of rotation.

Angle of Attack is between chordline and relative airflow.

Helix Angle = BLade Angle - Angle of Attack

Helix Angle + Angle of Attack = Blade Angle.

[AlexanderH]

thank you.