The verdict is in....... - Ranger-Forums - The Ultimate Ford Ranger Resource


General Ford Ranger Discussion General discussion of the Ford Ranger that does not fit in any other sub-forum.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 08-22-2004
John Moorehead's Avatar
Member
Thread Starter
 
Join Date: Jun 2004
Location: Murfreesboro, TN
Posts: 1,002
Just read a very informative article today in Road&Track magazine.

The article was about aerodynamics of trucks, and it answered the age-old question: tailgate up or down?

I see this debate pop up on here about once a month, so I paid special attention and "took notes"....

It presented several values of Coefficient of Drag (CD) based on the different scenarios. The results were as follows:

Test Vehicle: 2002 F-150

CD with tailgate up: ~51.2

CD with tailgate down: ~52.5

CD with net style tailgate: ~55.5

CD with partial tonneau: ~50.7

CD with full-sized hard tonneau: ~49.7


Basically, the higher the number, the more drag the vehicle produces through the airstream. A relatively small CD will also yield better gas mileage given an identical test vehicle and similar testing situations. So a tonneau DOES help with mileage and aerodynamic efficiency after all. And leaving the gate up is the best "free" thing you can do to improve CD of your truck.

Aside from the main slipstream being affected, the gate being down was also proven to decrease efficeny of air flowing under the truck, as well as making the box less rigid and more prone to major damage during a wreck, should it occur.

If anyone want's to see for themselves, look for this month's issue of Road&Track magazine.....it is in the back 1/4 of the book.
Reply With Quote
  #2  
Old 08-22-2004
FireRanger's Avatar  
Join Date: May 2004
Location: CT
Posts: 0
This study was done a long time ago and I have been saying this for years. Everytime however, someone insists that I am full of ______ and refuses to believe it.
Reply With Quote
  #3  
Old 08-22-2004
John Moorehead's Avatar
Member
Thread Starter
 
Join Date: Jun 2004
Location: Murfreesboro, TN
Posts: 1,002
Yeah, you and I both. :D

I knew it was "old news" to a few of us, but this was the first time lately I had seen it in a magazine and plainly said.
Reply With Quote
  #4  
Old 08-22-2004
FireRanger's Avatar  
Join Date: May 2004
Location: CT
Posts: 0
Well, maybe that will help the people who refuse to believe a scientific study with controls and variables.
Reply With Quote
  #5  
Old 08-22-2004
TheForce02's Avatar
Member
 
Join Date: Jun 2004
Location: Chino, CA
Posts: 846
good study! nice to see the numbers
Reply With Quote
  #6  
Old 08-22-2004
Member
 
Join Date: Jun 2004
Posts: 62
what is a partial tonneau? do they mean soft??
Reply With Quote
  #7  
Old 08-22-2004
FoMoCoFiddy's Avatar
Member
 
Join Date: May 2004
Location: Smackdownville Tx
Posts: 4,508
yep soft, cause i know my soft sometimes flaps up like air gets inside, i need a hard tonno..
Reply With Quote
  #8  
Old 08-22-2004
Member
 
Join Date: Jun 2004
Location: Orange City, FL
Posts: 1,601
what if I take off my tailgate and put on a soft tonno? JK!
Reply With Quote
  #9  
Old 08-22-2004
Member
 
Join Date: Jun 2004
Location: Colorado Springs, CO
Posts: 38
Re: Should I trust Jiffy Lube with my transmission?

Any statistics covering a hard body camper top? Such as mine?
Reply With Quote
  #10  
Old 08-22-2004
John Moorehead's Avatar
Member
Thread Starter
 
Join Date: Jun 2004
Location: Murfreesboro, TN
Posts: 1,002
Well, they didn't have the numbers on the camper present, but I would assume the numbers to be the same if not slightly less than the hard tonneau. The most aerodynamic shape in existence is a ball, so the fewer planar changes you have, the better off you are. A camper would immediately create a smooth surface for the air to flow over. The open bad/tailgate up is the best combo w/o mods because an air bubble is formed and thus makes a clean exit route for the air coming over the cab. A hard tonneau still utilizes an air pocket to complete the airflow path to the back, but the bubble is assisted in formation by the smooth surface and thus is created sooner. This is why most people notice a difference (read, decrease) in drag around 45-60 mph.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Verdict is In RangerNVS General Ford Discussion 24 02-08-2010 09:51 AM
Verdict...Black Truck SteveOh General Ford Ranger Discussion 9 04-24-2007 09:47 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 10:39 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.