If this rotor was from a 757 jet engine it would be nine feet in diameter. It looks to be about the same size as this man's inseam (the length from his crotch to his heel,) maybe 38 inches. Not that I'm trying to draw attention to his inseam, mind you.
This compares Penny Elges's Dodge Neon with a 757 jet. Remember to account for perspective! The car is closer to the camera so it looks bigger than it actually is!
Photographers turn away from the jet engine's blast of Air Force One as it leaves Sarasota Bradenton International Airport on September 11, 2001. Photograph courtesy Sarasota Herald-Tribune, Mike Diemer.