Originally Posted by
asgelle
To set the record straight, aero drag goes quadratically as speed, not exponentially. It takes 21% more power to go from 30 to 32 mph; it also takes 21% more to go from 15 to 16 mph. The drag at 15 mph is 56% that at 20 mph.
Actually, I'm pretty sure the relationship between drag and speed is exponential.
https://en.wikipedia.org/wiki/Drag_(physics)
The relationship between power needed and speed is cubic since power is force times velocity (i.e. speed).
ETA: brain fart on my part. You're correct.