Thanks all for your time but...yee gods!
I'm sure this, in detail, is a VERY complicated subject especially for my little brain.
I understand completely the vector diagramm of a blade in the hover IGE/OGE and climbing and decending, that in itself is fairly simple BUT Nick said that a helicopter hovers because it pushes air down.
Can't understand that one, a blade produces not only downward pressure but also lift does it not. A normal aerofoil use bernoulli's principle of pressure, 1/3 pressure underneath the lifting surface and 2/3 suction (for want of a better word), so a blade must produce the same and in addition downward thrust which a normal aerofoil does not, I assume. So we do in fact have three factors.
Am I still missing the point?