If you were to come up with a shape that in wind tunnel testing (real world) would have the least drag, what would it look like? That is what is the most aerodynamic shape?
I have always had it in my mind that a rain drop shape was the most aerodynamic, but is this true? I have never heard any proof stating this, it was just something I was told or heard somewhere.
If it is a rain drop shape, what proof exists?
I do have some constraints, in that the shape must have some volume, it can not be a sheet of paper. The shape should be such that it works best in mid air so no ground effects need apply.
Shapes I commonly think of when I think aerodynamics are car shapes, rocket shapes, and golf ball shapes.
Additionally does size make a difference, is their a shape that is universally the best?
This is just a question for discussion and curiosity, I am not designing anything.

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