The blades don't see the wind as you see it, they see a vector of the real wind and the component due to the blades rotating typically 6 times wind speed at the tip.

That is why the things have extreme difficulty starting from standstill. The angle of attack from the wind alone is over 80 deg and stall starts about 12 deg.

As the blades pick up speed the apparent wind moves round to far nearer the blade flying direction and at the maximum power point the angle of attack will be about 4 deg. As you slow the prop the apparent wind comes more into the direction of the true wind and at about 12deg angle of attack you start to stall.

Try Hugh's site, http://www.scoraigwind.com/ He has diagrams showing the real wind, the apparent wind, the pitch angle and the angle of attack.