View Single Post
Old 10-15-2021, 12:03 PM   #34 (permalink)
aerohead
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 16,320
Thanks: 24,442
Thanked 7,387 Times in 4,784 Posts
' Re: your second picture'

Quote:
Originally Posted by Vman455 View Post
Re: your second picture--

Pressure always acts normal to a surface. The arrows in the lower image are not correct.

A spoiler affects flow upstream because pressure is transmitted through air (fluid) at ~340 m/s. Fitting a spoiler may increase pressure as far upstream as the roof, as I found on my Prius with a small lip spoiler:


Gauge pressures with no lip spoiler


Gauge pressures with lip spoiler


Difference


Lip spoiler for reference

Les than $100 worth of equipment and a couple hours and you can measure yourself and find out what a spoiler does on your car.
Sorry, I couldn't figure out which picture you're referring to. None of my images have 'arrows.'
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
The Following User Says Thank You to aerohead For This Useful Post:
tomi_k (10-20-2021)