Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - " Aerodynamics doesn't begin to have an effect until 60 MPH "

freebeard · 11-29-2021, 01:24 PM

No reference, but from memory rolling resistance is linear and aerodynamic resistance is exponential.

There is a long tail on the lower end, IIRC aerohead has said 25 MPH is where the streamlines begin to order themsleves. At some point (45 MPH?) aero drag exceeds rolling resistance. The situation is complicated by the Reynolds Number and crosswinds.

11-29-2021, 01:24 PM	#4 (permalink)
freebeard Master EcoModder Join Date: Aug 2012 Location: northwest of normal Posts: 29,093 Thanks: 8,256 Thanked 9,020 Times in 7,453 Posts	No reference, but from memory rolling resistance is linear and aerodynamic resistance is exponential. There is a long tail on the lower end, IIRC aerohead has said 25 MPH is where the streamlines begin to order themsleves. At some point (45 MPH?) aero drag exceeds rolling resistance. The situation is complicated by the Reynolds Number and crosswinds. __________________ . .Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster ____________________ . .What the headline giveth, the last paragraph taketh away. -- Scott Ott