I have a concept for an airfoil that might be capable of providing vertical take-off and hovering (as well as forward or backward flight), but I need feedback to see if this would be feasible from an engineering / aeronautical standpoint. Bernoulli's Principle is classically demonstrated by by blowing air past the top of a drinking straw while the bottom is immersed in a glass of water. The resulting drop in air pressure within the straw causes the water to rise up in the straw. Now imagine what would happen if air were blown across the top of the straw, alternating rapidly from the left and the right. The water would still rise in the straw as it does not matter from which direction the air is being blown...Correct? Then also, it should not matter whether the air itself is being blown, or the top end of the straw is being moved back and forth rapidly in relation the the air. It is all relative right? So, now imagine an airfoil mounted so it can move rapidly back and forth causing the air to move over it's curved surface so as to generate lift. A system of solenoids could possibly push and pull such an air foil mounted to a frame, at say a distance of 1/2" back and forth. energizing the solenoids at the correct frequency could then approximate the speed of a conventional airfoil moving through the air at the correct speed to impart lift (in any direction or orientation) so that vertical take-off, hovering and forward / backward flight could be acheived...What are your thoughts???