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hard edges or shoulders?
Sharp cutoffs at the rear are generally a good thing (short of a complete taper). A rounded body shape is better for good aerodynamics, think of the cylindrical fuselage of a passenger plane. Darin is referring to the bends or creases in the cardboard where it turns down on the sides of his hatchback. It would be somewhat better aerodynamically if those were more rounded. If the air pressure on the sides is not exactly the same at that coming over the top, rounded shoulders can allow those to equalize a little. Sharp shoulders can be vortex generators which increase turbulence and drag.
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https://ecomodder.com/forum/showthre...tml#post621801
Quote:
Originally Posted by freebeard
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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