Go Back   EcoModder Forum > EcoModding > Aerodynamics
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 01-03-2018, 01:10 PM   #1 (permalink)
EcoModding Lurker
 
Join Date: Jan 2017
Location: UK
Posts: 30
Thanks: 0
Thanked 2 Times in 2 Posts
Bonnet bra aero

Got my hands on one of these today (in between prescription and Tegu wrangling) and something struck me as odd.
The back edge of the upper panel has what I'd describe as two ears (presumably airflow hold downs) but it strikes me that if you look up the line of flow towards the windscreen wipers, the two ears (perpendicular triangular spoilers about an inch high and maybe 6in wide) might act to channel the airflow around and over the exposed wiper mounts (thank you Hyundai).
I dont know if I'm going to fit this yet, I'm not even sure if I'll even get a working car back - but it strikes me that if this is the case for certain cars, you'd get an aerodynamic benefit as well as protection from road edge gravel and stones helpfully sprayed by uncoordinated cretins (although not the head sized rock that was spat out of an artic wheel and almost decapitated my dad (that was one sad looking Mercedes estate)).
I wondered if anyone had previously tested or thought of testing this theory? The things look not a little like a split gurney flap and while I doubt the manufacturer had any aerodynamic intentions it wouldn't be the first time something had unexpected side effects..

  Reply With Quote
The Following User Says Thank You to Rosieuk For This Useful Post:
aerohead (01-06-2018)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 01-03-2018, 01:23 PM   #2 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,223

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,413
Thanked 3,050 Times in 1,943 Posts
I like how you said you got your hands on one...
__________________


  Reply With Quote
Old 01-06-2018, 12:30 PM   #3 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 8,713
Thanks: 11,396
Thanked 4,611 Times in 2,591 Posts
thought of

That feature has been in the market for 30-years or so.I've never seen anything claimed for the feature and my best guess,is that,the trailing edge of the bra is in accelerated flow and would be sucked into the low pressure there.The spoilers kill the lift and keep things from fluttering and hammering the finish of the vehicle.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
The Following User Says Thank You to aerohead For This Useful Post:
Xist (01-06-2018)
Old 01-07-2018, 03:11 AM   #4 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 10,792
Thanks: 2,435
Thanked 3,414 Times in 2,696 Posts
I like that theory.

Quote:
I dont know if I'm going to fit this yet, I'm not even sure if I'll even get a working car back...
Wut?

Quote:
...but it strikes me that if this is the case for certain cars, you'd get an aerodynamic benefit as well as protection from road edge gravel and stones helpfully sprayed by uncoordinated cretins...
Possible benefit from acting as a grille block to internal air flow, but some concern about trapping moisture against the paint.

Quote:
...(although not the head sized rock that was spat out of an artic wheel and almost decapitated my dad (that was one sad looking Mercedes estate)).
I had a fist-sized rock dislodge from the rear duals on a dump truck and strike the hood of my VW Beetle 2ft ahead of the windshield, but it bounced sideways and knocked the rear-view mirror right off the car.

__________________
.
Walk without rhythm and it won't attract the worm. --fatboy slim
_________________
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com