Aviation has always tried to push the boundaries of what’s possible and sometimes even, what’s reasonable. For every sleek machine or elegant plane, there’s something that looks like it’s about to collapse in the air. 

These odd aircrafts prove that flight is equal parts imagination as engineering. There are some that look like out of a cartoon and others seem like they were patched together with spare parts.

Here are some of the strangest aircrafts to ever take the skies, proof that sometimes is just better to keep both feet on the ground.