You know there's some scientists who study shapes and they say that diameter and height are different properties of a cylinder. I wouldn't know anything about that though I'm certainly no scientist.
It's the article which is comparing the height of a can to the radius or diameter of the motor (apparently the radius, but it would be more logical to compare it to the diameter).
It's just as valid as using bananas for scale, but the issue with the article is that that it doesn't even bother to mention the actual dimensions in cm or inches, yet it uses "tiny" in the title to describe the engine.
