JK Drag Coefficient? - Page 2

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  1. #11
    JK Freak toymaster's Avatar
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    Quote Originally Posted by spinlock View Post
    You can approximate it, by using the power curve (to the wheels) and equate it to the drag, measure the frontal area and you are on your way.

    Yeah, Yeah what he said...that's right...uuuahh
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  2. #12
    JK Enthusiast dxbjeep's Avatar
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    being an aerospace engineering graduate myself, the wrangler is about as bad as it gets regarding vehicles and DC. certainly doesnt compare to a 777
    If automobiles had followed the same development cycle as the computer, a Rolls-Royce would today cost $100, get a million miles per gallon, and explode once a year, killing everyone inside!

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  3. #13
    JK Jedi Master Mark Doiron's Avatar
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    Quote Originally Posted by spinlock View Post
    ... Rest assured the 3.8L does not generate enough thrust and lift for air travel.
    Then explain your avatar, sir!


  4. #14
    JK Junkie 07JKX's Avatar
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    Quote Originally Posted by spinlock View Post
    (laminar flow).
    i had a laminar flow after I drank too much... or was it luminescent?
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  5. #15
    JK Jedi RedneckJeep's Avatar
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    Are you serious? You gotta be on drugs.
    The difference between conservatives and liberals is becoming less and less. Scary, isn't it?


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  6. #16
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    Mech E grad student here. I know the JK is a better coefficient of drag compared to all earlier models (I read an article about this shortly after the JK came out that the slightly swept back grill and windshield compared to the earlier models helped it somewhat). According to Reynolds number (that characterizes the fluid flow regime) the flow becomes turbulent before you even hit 1 mph so think it terms of turbulent flow. If it helps it looks like the SRT-8 grand cherokee is a drag coefficient of 0.39 (which I am sure is much better than the JK) so compared to the 0.55 of the TJ I would say a good estimation of the drag coefficient for the JK would be ~0.5. Finally I would think the drag would be essentially the same for the 2dr and 4dr as the entry and exit profiles of them are identical and the additional skin drag of the extra length of the 4dr is negligible compared to the drag created by flow over the hood and rear of the Jeep.

    Hope this helps as I understand how it is having engineering projects and not being able to find accurate info.
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  7. #17
    JK Enthusiast CdnJeepDan's Avatar
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    Maybe buy a scale model?

    h ttp://www.allthingsjeep.com/mtr9908708x.html

    (Take out the space between the h and the ttp).
    "The voices aren't real, but they have some good ideas."
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  8. #18
    Sponsoring Manufacturer TeraFlex's Avatar
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    Isn't it in the same range of the broad side of a barn?
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  9. #19
    JK Jedi RedneckJeep's Avatar
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    This dude doesn't give a damn about drag coefficient. ...and his little DJ is spankin some ASS.

    http://www.youtube.com/watch?v=IXyec7Pm9kQ
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  10. #20
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    Can't you just test it by holding up a 4x8 sheet of 3/8" plywood on a windy day?

    It's gotta be close...

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