Thanks,
i also agree with you sprocket.
i was comparing drag and lift polars of a VR7 and an ONERA OA213 and wondering what solutions had been tested to improve lift in the rev-flow zone or, at least, to control the stall.
The funny is that all numbers about the airfoils are given for a straight perpendicular airflow, but this "ideal" airflow just happens at the 90 deg azimut.. the rest of the time a blade being submitted to a mix of front and lateral flow. in fact i guess the air flow on an airfoil is more curved. or am i wrong?
If i'm correct how is it managed in the theories?
thanks.