Why do mortar shells have fins, but not artillery shells?

Question

Why do mortar shells have fins, but not artillery shells?

In: Engineering

Answer 1

An artillery fires big bullets, so they have a smooth barrel and the bullet fills up the tube.
Mortar shells aren’t shaped like a cylinder like a bullet is. It’s not designed to ride the sides of the barrel in tight fit. Which means you can put find on it.
In summation, artillery : bullet :: mortar : Rocket.