| twin turbo |
03-22-2012 08:27 AM |
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.
|
Quote:
Originally Posted by patrickt
(Post 988892)
|
Perhaps its those wiide tires. |
| CobraV8 |
03-22-2012 12:07 PM |
Quote:
Originally Posted by Dwight
(Post 1182194)
So I am going to use a published Cd of 0.42 for the open bodied Cobra
|
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 |
| mdross1 |
03-23-2012 05:35 AM |
Quote:
Originally Posted by Dominik
(Post 1182185)
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+ ;-)
|
Okay MASONRY!!! thank you I'm sure there were some that could not figure out what I meant with that spelling error. |
| Jerry Clayton |
03-23-2012 08:04 AM |
so do you have to be a mason to go fast??
|
| Skuzzy |
03-23-2012 01:30 PM |
Every chisler I knew was able to get out of Dodge really fast. :D
|
| mdross1 |
03-24-2012 07:42 AM |
Quote:
Originally Posted by Jerry Clayton
(Post 1182360)
so do you have to be a mason to go fast??
|
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. |
| Dominik |
03-29-2012 02:06 AM |
"out of Dodge really fast."
Like: dodging it?
|
| jon@harrison.ne |
03-31-2012 08:37 PM |
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.
|
| Jerry Clayton |
03-31-2012 08:46 PM |
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?????
|
| Dwight |
04-01-2012 06:58 AM |
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
|
| Dwight |
04-01-2012 07:19 AM |
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 |
| Steve Cassani |
04-01-2012 09:15 AM |
|
| Bilster |
03-22-2016 10:02 AM |
Quote:
Originally Posted by Excaliber
(Post 989090)
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. |
| Tommy |
03-22-2016 02:15 PM |
Blister,
What year is it where you are? It's 2016 over here.
|
| lippy |
03-22-2016 02:18 PM |
Quote:
Originally Posted by jon@harrison.ne
(Post 989047)
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.
|
Isn't is proportional to speed cubed? |
| RockBit |
03-22-2016 02:28 PM |
Drag force is proportional to speed squared.
Drag power is proportional to speed cubed.:)
|
| mdross1 |
03-23-2016 05:08 AM |
It matters very little to this cat what that number is. I love my masonary 4 wheel hot rod.
|
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....:CRY:
|
| G-Pete |
03-23-2016 12:49 PM |
Quote:
Originally Posted by eschaider
(Post 989152)
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.
|
....not was, he is pretty sharp. On top of that, he is a great person!
http://photos.imageevent.com/germanp...ia/large/1.jpg |
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