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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 02-15-2012, 07:03 PM   #1 (permalink)
EcoModding Apprentice
 
Join Date: Dec 2011
Location: Miami FL
Posts: 121
Thanks: 1
Thanked 16 Times in 10 Posts
Windshield should be more inclined than the hood?

By more inclined I mean that the windshield has lesser angle to the vertical than the hood.

Thus you have to either make the windshield more inclined and/or make the hood less inclined i.e. less horizontal?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 02-15-2012, 07:51 PM   #2 (permalink)
Master EcoModder
 
Join Date: Jul 2008
Location: Silly-Con Valley
Posts: 1,432
Thanks: 178
Thanked 230 Times in 178 Posts
Aero is not the only constraint or concern when designing a car.

If you make a steeply-raked windshield, you have a whole lot of glass. It will give more distortion when you look through it, and it will allow more heat into the car from the sun. It will also be heavier, and will likely be harder to keep clean (requiring larger wipers and washer systems) and so on.

As to your question, I'm not sure the actual angle of the windshield to the front lid is that critical for aero. If the angle isn't too great, it probably doesn't make a huge difference.

-soD
  Reply With Quote
Old 02-15-2012, 07:54 PM   #3 (permalink)
Master EcoModder
 
Sven7's Avatar
 
Join Date: Aug 2011
Location: Warren, MI
Posts: 2,456

Boo Radley - '65 Ford F100
90 day: 13.28 mpg (US)
Thanks: 782
Thanked 665 Times in 408 Posts
Aerodynamically it will bring it closer to the ideal profile, so yes. As Dave says, though, you might cancel out that improvement if the large window heats your car and necessitates A/C usage.

__________________
He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
  Reply With Quote
Old 02-15-2012, 08:01 PM   #4 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,757

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: 1,582
Thanked 3,541 Times in 2,211 Posts
__________________


  Reply With Quote
Old 02-15-2012, 08:51 PM   #5 (permalink)
EcoModding Apprentice
 
Join Date: Nov 2011
Posts: 116
Thanks: 0
Thanked 7 Times in 7 Posts
On the ac thing, has anyone ever tried modifying an electric water pump kit to run the ac compressor? I can't help but think if everything but the alternator was running off electric motors it would boost fuel economy. Hmmmm, time to see what parts I have lying around.
  Reply With Quote
Old 02-16-2012, 11:42 AM   #6 (permalink)
UFO
Master EcoModder
 
UFO's Avatar
 
Join Date: Sep 2010
Location: Denver, CO
Posts: 1,300

Colorado - '17 Chevrolet Colorado 4x4 LT
90 day: 23.07 mpg (US)
Thanks: 315
Thanked 178 Times in 138 Posts
Quote:
Originally Posted by Sentraguy View Post
On the ac thing, has anyone ever tried modifying an electric water pump kit to run the ac compressor? I can't help but think if everything but the alternator was running off electric motors it would boost fuel economy. Hmmmm, time to see what parts I have lying around.
By running AC off an electric compressor, you will likely hurt fuel efficiency due to losses in converting mechanical energy to electric and back to mechanical to operate the compressor. The reason why electric conversion of some accessories can save fuel is either due to offline battery charging, and not using your alternator, or in the case of electric fans and water pumps, you can run them either periodically when needed or at an optimal speed not dependent on engine rpm.
__________________
I'm not coasting, I'm shifting slowly.
  Reply With Quote
Old 02-16-2012, 02:05 PM   #7 (permalink)
Master EcoModder
 
Sven7's Avatar
 
Join Date: Aug 2011
Location: Warren, MI
Posts: 2,456

Boo Radley - '65 Ford F100
90 day: 13.28 mpg (US)
Thanks: 782
Thanked 665 Times in 408 Posts
The easier solution:
__________________
He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
  Reply With Quote
Old 02-16-2012, 02:33 PM   #8 (permalink)
Master EcoModder
 
Join Date: Jul 2008
Location: Silly-Con Valley
Posts: 1,432
Thanks: 178
Thanked 230 Times in 178 Posts
Unfortunately difficult do use that solution while driving, Sven7.

-soD
  Reply With Quote
Old 02-16-2012, 02:35 PM   #9 (permalink)
Master EcoModder
 
euromodder's Avatar
 
Join Date: Jul 2010
Location: Belgium
Posts: 4,667

GasDwarf - '13 Volkswagen up! EcoFuel CNG
Thanks: 176
Thanked 643 Times in 510 Posts
Quote:
Originally Posted by Sven7 View Post
The easier solution
Works even better when fitted to the outside of the window(s).
  Reply With Quote
Old 02-17-2012, 11:54 PM   #10 (permalink)
EcoModding Apprentice
 
Join Date: Jun 2008
Location: british columbia canada
Posts: 102
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Big time View Post
By more inclined I mean that the windshield has lesser angle to the vertical than the hood.

Thus you have to either make the windshield more inclined and/or make the hood less inclined i.e. less horizontal?
Very good............shim your hood at the hinges increasing the incline till you are satisfied.................when your point re hood incline is proven drop me a line for a permanent fix...........you will be surprised

crexcrex

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com