Instead of holding your palm hand forward, you tip your palm slightly downward, the force on your hand will be

Question

Instead of holding your palm hand forward, you tip your palm slightly downward, the force on your hand will be both backward and upward. how is the airstream exerting and upward force on your hand?

Answer 1

I assume the scenario is holding your hand out the window of a moving vehicle.

If your hand is inclined with the front higher than the back, it will experience aerodynamic lift. At a small angle of attack, where your hand is almost horizontal, the lift will be small. As the angle of attack increases and your fingers point skyward, the lift will increase along with the drag. As the angle increases further still, it will reach a stall configuration where the lift will drop off dramatically and then the ram air on the underside will provide the only lift. Finally, when your fingers are pointing straight up, the only aerodynamic effect will be drag.

Answer 2

The airstream is pushing on the lower surface, the palm, more than on the upper surface, the back of the hand.

Answer 3

it extremely is cool to be attentive to. yet we ought to continuously no longer pass too deep into this numerals stuff. some people start up from numbers and make it into any such enormous concern, like interior the case of palms, "fortune-telling". O_O