The famous fan/propeller cup holders are back!
These would be great for keeping things from falling down in-between the console and the seat!
I was just about to pull the trigger and buy this.
Then I read the Amazon reviews.
Was in for two of these the last time they were offered. They reduced the width of my seats so much it wasn’t worth it. I felt cramped and uncomfortable. Gave them away after just one day. Unless you’re a slim or petite individual, or unless you have very wide bucket seats these things are not worth the hassle. That’s my experience, your mileage may vary.
I just put one on the passenger side so I can hold three cup holders total, with room for sunglasses and phone.
LOL what is the deal with the propeller I can’t figure it out 
It usually has to do with physics and how air moves around one side faster than another with more drag that causes lift (push) depending on if you’re using them on a plane or a helicopter. But yeah physics can be hard
Increased airflow means more condensation on the outside means warmer contents inside. LOOKS like a good idea, but not. Unless you WANT your hot coffee to cool quickly. Yeah, thermodynamics is informative AND sucks.
You are describing Bernoulli’s principle not a propeller. Physics is hard.