Airyana,
Picture the aircraft banked in a turn. If there is no dihedral present both wings will have the same angle of attack to the sideslip velocity (neglecting any factors arising from flow around the fuselage). The dihedral means that the lower wing is presented to the oncoming sideslip velocity at a different angle of attack than the higher wing.
Draw the two wings of an aircraft with dihedral (viewed from the front whilst banked), but leave a gap instead of the fuselage. Treat each wing as a flat plate and draw the direction of the velocity caused by sideslip. The higher wing has a larger negative angle of attack with reference to this sideslip direction than the lower wing does. This means the lower wing will produce more lift and pull the aircraft straight and level.
Hope this makes some kind of sense!
MM
Last edited by moogleman; 14th Sep 2006 at 10:57.
Reason: spelling mistake!