What's in a shape? Why do so many sit up?

What up with Aeronautics?

Aeronautics is the science of flight in air and space. Scientists and engineers who study aeronautics learn about how and why airplanes fly in air. Using what they learn, they can design better, safer, and cheaper-to-build airplanes.

But what about the study of things in a heavy medium that produce even more force.

What's really amazing is why this happens. The special shape (nature) or of an airplane's wing makes the air (water) moving around it behave in a certain way. If we look at an airplane's wing from the side, we can see that the wing is a special shape called an airfoil.

An airfoil is curved on the top and flat on the bottom, causing some of the air to go over the top and the rest of the air to go along the bottom. This shape looks simple, e.g. fish, but it is the main reason airplanes can fly at all. Because of the airfoil's curved shape, the air moving under the airfoil moves at a slower speed than the air going over the top.

Once you get one of those shapes on the line in medium and current and note how fast they can move, only then do you start to understand the shapes that make a difference. They are doing a form of flying!

We are not attempting to take flight, but we need to take note. Why then does the bike industry want you to sit up more when you really want to go forward? Perhaps it's too much to ask and teach.

If you take a strip of paper and blow over the top of it as shown in the picture below, the paper will rise. Wow!