The Mountains of Magic Kingdom - 24 Facts & Secrets

2 - The steepest slope of the drops within the attraction is 39 degrees.

I was shocked to learn this fact.  When you are speeding through the dark into “space” the drops definitely feel much steeper.  I think this goes to show how much of an impact all of your senses play into enjoying an experience and the perception about the experience.  It is so much more than just the drops and ride path alone.