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 2Likes
03-22-2012, 08:27 AM
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CC Member
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Join Date: Mar 2009
Cobra Make, Engine: FFR
Posts: 388
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Not Ranked
Dwight, if I read that info correctly a Cobra takes less hp than a ZR1 Vette to go the same speed. That doesn't seem plausable to me, especially without removing the windshield.
Last edited by twin turbo; 03-22-2012 at 08:36 AM..
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03-22-2012, 11:51 AM
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CC Member
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Join Date: Jan 2008
Location: Sacramento, CA,
Posts: 636
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Not Ranked
Quote:
Originally Posted by patrickt
Most people would bet that a Lamborghini Countach would not have the same CoD as the Cobra, when actually they're very, very close.
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Perhaps its those wiide tires. |
03-22-2012, 12:07 PM
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CC Member
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Join Date: Jan 2004
Location: Shawbury,
Posts: 325
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Not Ranked
Quote:
Originally Posted by Dwight
So I am going to use a published Cd of 0.42 for the open bodied Cobra
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That's most probably too low, ~0.6 is what I remember. Especially since Dominiks coast down test with the hardtop in place confirms this number, I'd guess it would be higher without the hardtop.
It should be a save approach to use 0.65 for the Cobra.
Would be interesting to know what effect using the small comp windscreen does have on the cd.
Simon
Last edited by CobraV8; 03-22-2012 at 12:10 PM..
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03-23-2012, 05:35 AM
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CC Member
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Join Date: Nov 2001
Location: Windham,,
Me
Cobra Make, Engine:
Posts: 1,590
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Not Ranked
Quote:
Originally Posted by Dominik
Incidentally the photo taken from my car IS outside the OPEL mother plant.
Tire friction losses are a major factor at higher speeds, even with 500cui+ ;-)
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Okay MASONRY!!! thank you I'm sure there were some that could not figure out what I meant with that spelling error. |
03-23-2012, 08:04 AM
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CC Member
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Join Date: Jul 2005
Location: Bartlett,
Ill
Cobra Make, Engine: Everett-Morrison LS1
Posts: 2,448
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Not Ranked
so do you have to be a mason to go fast??
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03-23-2012, 01:30 PM
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CC Member
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Join Date: Sep 2009
Location: Ft. Worth,
TX
Cobra Make, Engine: LSC427, 427DartSHP
Posts: 154
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Not Ranked
Every chisler I knew was able to get out of Dodge really fast. 
__________________
Sometimes things really do go as planned.
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03-24-2012, 07:42 AM
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CC Member
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Join Date: Nov 2001
Location: Windham,,
Me
Cobra Make, Engine:
Posts: 1,590
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Not Ranked
Quote:
Originally Posted by Jerry Clayton
so do you have to be a mason to go fast??
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Heck one of the guys I ride with is a Mortician and he is plenty fast.I have worked with stone and mortar riding around in my brick sure brings out the racer. |
03-29-2012, 02:06 AM
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CC Member
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Join Date: Jun 2000
Location: Cape Town, South Africa/Mainz, Germany,
Posts: 1,601
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Not Ranked
"out of Dodge really fast."
Like: dodging it?
__________________
If I don't respond anymore, that's because I can't log in
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03-31-2012, 08:37 PM
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CC Member
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Join Date: May 2007
Cobra Make, Engine: JCF supplied the body,frame,and some of the driveline-I completed it to be a very accurate 289 slabside
Posts: 149
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Not Ranked
To Dwight who posted on March 22: I didn't study in detail all your equations because when I got to "rho" (air density) in "slugs", I lost interest. A slug is a unit of mass; density has units of mass per cubic ft. I'm surprised you didn't give frontal area in pounds. Suggest you go back to Cal Poly and take a refresher course.
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03-31-2012, 08:46 PM
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CC Member
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Join Date: Jul 2005
Location: Bartlett,
Ill
Cobra Make, Engine: Everett-Morrison LS1
Posts: 2,448
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Not Ranked
I guess that in your in depth reading and analis of the article that you missed the fact that it wasn't Dwight , but a guy named Mayfield that authored that?????
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04-01-2012, 06:58 AM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
sorry jon@harrison this is not my calculations. I copied it from (I think) someone on the FFR site several years ago.
This type of math is way beyond my abilities.
Thanks for the compliment though.
I could not get the charts to copy paste correctly, sorry.
Dwight
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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04-01-2012, 07:19 AM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
I wanted to post the charts from the article but could not. I did a google search and found that L.E. Mayfield wrote the tech article. He is big into a Sunbeam Tiger project. Interesting reading.
The first link is to the article on Cobra. The other two are to his Home Page and analyses page.
Interesting reading but I'm not smart enough to argue with anyone about this stuff.
enjoy
Dwight
++++++++++++++++++++++++++++++++++++++++++++++++++ ++++
"Cobra HP vs Speed" Wanna know how fast your FF Cobra replica or real thing will go if you have a certain amount of horsepower? Well here is everything you want to know. Rest easy when you get to the page and scroll down to the table and chart!
The Mayfield Company Homepage - Automotive Analyses
The Mayfield Company Homepage - Automotive Analyses
The Mayfield Company Homepage
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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04-01-2012, 09:15 AM
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Senior Club Cobra Member
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Join Date: Nov 2003
Location: Billings,
MT
Cobra Make, Engine:
Posts: 365
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Not Ranked
The Mayfield Company Homepage - Automotive Analyses
I believe he addresses the concern for mis-matched units of meaure when he substitutes R - the universal gas equation - for the former unit of measure, slug.
__________________
A beautiful car, precisely assembled. Unfortunately I don't fit. Sold it after four hundred miles. Well, at least now I know a Cobra is not a car I can own.
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03-22-2016, 10:02 AM
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CC Member
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Join Date: Apr 2004
Location: Albuquerque,
NM
Cobra Make, Engine: Everett-Morrison/C4 Corvette Suspension
Posts: 10
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Not Ranked
Quote:
Originally Posted by Excaliber
Oh I'm just jumping up and down over the good news...  |
No cause for celebration. The 99-2003 Ford Lightnings come in at 0.36. So definitely not more aerodynamic than all trucks. |
03-22-2016, 02:15 PM
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CC Member
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Join Date: Feb 2002
Location: Dadeville,
AL
Cobra Make, Engine: Sold my EM.
Posts: 2,459
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Not Ranked
Blister,
What year is it where you are? It's 2016 over here.
__________________
Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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03-22-2016, 02:18 PM
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CC Member
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Join Date: Apr 2012
Location: Bay Area (Peninsula),
CA
Cobra Make, Engine: ERA 427, 427/487 side-oiler
Posts: 1,248
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Not Ranked
Quote:
Originally Posted by jon@harrison.ne
The drag coefficient Cd has nothing to do with the size of the car,only the shape. The total drag force is proportional to the frontal area times Cd times speed squared.
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Isn't is proportional to speed cubed? |
03-22-2016, 02:28 PM
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CC Member
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Join Date: Jun 2014
Location: Dallas,
TX
Cobra Make, Engine: ERA #812 427/482 FE
Posts: 495
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Not Ranked
Drag force is proportional to speed squared.
Drag power is proportional to speed cubed.
__________________
Chris
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03-23-2016, 05:08 AM
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CC Member
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Join Date: Nov 2001
Location: Windham,,
Me
Cobra Make, Engine:
Posts: 1,590
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Not Ranked
It matters very little to this cat what that number is. I love my masonary 4 wheel hot rod.
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03-23-2016, 07:02 AM
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CC Member
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Join Date: Aug 2013
Location: Canandaigua,
NY
Cobra Make, Engine: SPF MKII Riverside Racer FIA
Posts: 2,502
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Not Ranked
Unless you plan on racing at LeMans or at the pro level in SCCA, none of us are ever going to attain speeds at which the drag coefficient becomes meaningful. But it does make for an enlightening discussion while we sit at home and complain about the lousy weather that prevents us from driving our cobras....  |
03-23-2016, 12:49 PM
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CC Member
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Join Date: Dec 2010
Location: Allen,
TX
Cobra Make, Engine: Werk77 289FIA
Posts: 1,295
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Not Ranked
Quote:
Originally Posted by eschaider
Ole Pete was one sharp dude. He actually did a great deal of personal research into airflow and clean automotive design before he implemented it in the real world we know as the Daytona Cobra.
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....not was, he is pretty sharp. On top of that, he is a great person!
__________________
Scratch build 289 FIA see the Scratch builder forum on CC - sold
DRB GT40 MK1 red #49- sold
FF5 Mk4 #7733 302/T5/IRS - dark blue - sold
FF5 MK4 #7812 427/TKO/IRS - Guardsman Blue - sold
FF5 MK4 #8414 501/TKO600/48IDA Ollie the Dragon #91 - sold
FF5 Daytona Coupe 347/TKO/IRS Homage CSX2299 Viking Blue - sold
SPF 2063
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