We all know that curved shape on the top of an aerofoil causes air passing over it to flow at a higher speed than on the underside of the wing. This faster air flow creates a low pressure zone above the wing. The lower velocity air under the wing is high pressure. Therefore lift is generated.

Why then does a fully symmetrical wing generate any lift at all? Why are the lifting forces not cancelled out?

Also, why do aeroplanes with totally flat wings, some of the foamies for instance, with no aerofoil section to speak of fly at all?

Anyone answer these form me?

Regards,

Dave