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Happy homeowners pickup

  1. #76
    BMW track whore e30addict's Avatar
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    Re: Happy homeowners pickup


    Quote Originally Posted by scottieducati View Post
    Mythbusters debunked all that didn't they? An empty bed w/ gate up makes the air swirl behind the cab, then most of the air glides over the air "trapped" in the bed.
    That they did. The airflow becomes turbulent as it separates from the top of the cab. This creates a low pressure area in the bed (the trapped air).

    The easiest transition of separation, or more laminar airflow, which is really what reduces drag, comes from shapes closest to a tear drop.

    The tonneau cover has a neglible effect since the greatest drag is caused as the air leaves the cab and rejoins the slipstream.

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    Last edited by e30addict; 01-12-17 at 12:30 PM.
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  2. #77
    Super Moderator TheIglu's Avatar
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    Re: Happy homeowners pickup

    Chevy Voltron: It's yer heater.

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  3. #78
    Kosher Assassin Stoneman's Avatar
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    Re: Happy homeowners pickup

    Quote Originally Posted by e30addict View Post
    That they did. The airflow becomes turbulent as it separates from the top of the cab. This creates a low pressure area in the bed (the trapped air).

    The easiest transition of separation, or more laminar airflow, which is really what reduces drag, comes from shapes closest to a tear drop.

    The tonneau cover has a neglible effect since the greatest drag is caused as the air leaves the cab and rejoins the slipstream.
    Over all the years of owning a pick-up truck, I have also yet to see any improvement in fuel economy leaving the tailgate down. A bad side to constantly leaving your tailgate down? Ever see an older truck that has the bed sides all cambered out? Wonder how long they've been running without a tailgate...

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  4. #79
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    Re: Happy homeowners pickup

    There' s a lot that goes into reduction in fuel mileage in the winter. Two of the biggest are winter fuel blends and increased wind resistance due to denser air. Also, did you inflate your tires once it started getting cold? And of course, if you let the thing idle for a half hour every morning like my wife, you might burn a little more fuel.

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  5. #80
    Angry Gumball RandyO's Avatar
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    Re: Happy homeowners pickup

    Quote Originally Posted by R7 View Post
    Colder air = more fuel needed
    Quote Originally Posted by nhbubba View Post
    + winter fuel blend
    + may more reasons

    colder denser air has more wind resistance
    colder tires don't flex as well and have more rolling resistance
    colder grease in axles has more rolling resistance
    as well as generally more warm up time and other things that I have forgotten

    each relatively insignificant independently, but they add up


    Quote Originally Posted by TheIglu View Post
    Chevy Voltron: It's yer heater.
    I had a VW Bus with a gas heater in it, but someone riding with me once said "jees, that's just like a wood stove" the dash would get so hot, you could get burns if you kept your hand on it too long (not a modern padded dash, an old metal one)
    Mileage in the high 20's in the summer would drop as low as 4-5 in -25 weather

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    Last edited by RandyO; 01-12-17 at 01:12 PM.
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  6. #81
    Burns retinas nhbubba's Avatar
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    Re: Happy homeowners pickup

    + More NESR posts to carry around

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  7. #82
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    Re: Happy homeowners pickup

    Quote Originally Posted by scottieducati View Post
    Mythbusters debunked all that didn't they? An empty bed w/ gate up makes the air swirl behind the cab, then most of the air glides over the air "trapped" in the bed.
    I'll go out on a limb and say the 1989 2wd 4cyl shortbed Ranger they used is a bit different than my 2010 4x4 V8 extended cab Tundra.

    I would want to repeat the test with like vehicles.

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  8. #83
    go faster cdovego's Avatar
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    Re: Happy homeowners pickup

    Quote Originally Posted by scottieducati View Post
    Mythbusters debunked all that didn't they? An empty bed w/ gate up makes the air swirl behind the cab, then most of the air glides over the air "trapped" in the bed.
    I do notice less turbulence going down the highway at 65 with the cover on vs. not.

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  9. #84
    Kosher Assassin Stoneman's Avatar
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    Re: Happy homeowners pickup

    Quote Originally Posted by butcher bergs View Post
    I'll go out on a limb and say the 1989 2wd 4cyl shortbed Ranger they used is a bit different than my 2010 4x4 V8 extended cab Tundra.

    I would want to repeat the test with like vehicles.
    A neighbor has a '12 F250 something-or-other and says he sees no difference with or without his cover on. Sometimes it's a mile or two better, sometimes a mile or two worse. Naturally it's damn near impossible to duplicate exact driving conditions etc., but he CLAIMS there's generally no difference...

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  10. #85
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    Re: Happy homeowners pickup

    Just watch next time there is light rain, which lets you see where the air is going.

    Or just read about GM's tests.

    A long-disputed topic among truck owners is whether a tailgate raised or lowered is better for aerodynamics, but Bloch says a tailgate in the up position is more aerodynamically efficient. As air flows over the truck, it falls over the cab and pushes forward on the rear of the truck. With the tailgate down, the benefits of that airflow are diminished.

    Replacing the tailgate with an aftermarket net is worse than having no tailgate at all,” Bloch said. “Imagine dragging a solid object and a fishing net through water. The net is going to require more muscle.”

    So what accessories can truck owners add to help aerodynamics? Tonneau covers for the bed help smooth airflow over the truck, and Bloch says soft covers are more beneficial than hard covers because they form to how the air wants to flow. Running boards can also help air flow smoothly down the truck’s sides.

    “Round, tube-style running boards can provide a minor improvement to the truck’s drag coefficient,” said Bloch, “Fully integrated, flush-mount running boards are even better.”
    Or the same answer from Ford.


    Or Dodge.

    Dodge aerodynamic engineers, like those at the other pickup manufacturers, agree.

    “Our wind tunnel data falls in line with industry conclusions – that the tailgate down configuration is significantly higher in drag than the tailgate up (around 2-3%),” says Mark Gleason, Supervisor / Aerodynamics at the DaimlerChrysler Scientific Labs and Proving Grounds.

    “Although it seems counter intuitive, having the tailgate up acts somewhat like a deck spoiler on the trunklid of a race car. The tailgate actually raises the pressures on the rearward facing surfaces of the pickup cab and the forward surface of the bed, thereby lowering the drag of the vehicle,” explains Gleason.

    “Testing conducted by SAE confirms this condition, estimating an increase in vehicle drag of 2-3% with the tailgate down. Testing also shows that, counter to advertised claims, mesh tailgate replacements will degrade vehicle drag even further.”

    - See more at: Tailgate Down Myth | Medium Duty Work Truck Info

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    Last edited by Garandman; 01-12-17 at 04:54 PM.

  11. #86
    Angry Gumball RandyO's Avatar
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    Re: Happy homeowners pickup

    the same reason a golf ball is more aerodynamic than a ping pong ball, the bed is one big dimple

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  12. #87
    Changes come butcher bergs's Avatar
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    Re: Happy homeowners pickup

    Quote Originally Posted by Stoneman View Post
    A neighbor has a '12 F250 something-or-other and says he sees no difference with or without his cover on. Sometimes it's a mile or two better, sometimes a mile or two worse. Naturally it's damn near impossible to duplicate exact driving conditions etc., but he CLAIMS there's generally no difference...
    My point is, I'm not one to assume all trucks will have the same results based off what one episode on some TV show said. Far too many variables, as you've already alluded to.

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  13. #88
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    Re: Happy homeowners pickup

    Quote Originally Posted by scottieducati View Post
    Mythbusters debunked all that didn't they? An empty bed w/ gate up makes the air swirl behind the cab, then most of the air glides over the air "trapped" in the bed.
    Mythbusters gets so many basics wrong in most shows that I put zero credibility into anything they 'prove.'

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  14. #89
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    Re: Happy homeowners pickup

    Aaaand, it's winter on NES....

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  15. #90
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    Re: Happy homeowners pickup

    Quote Originally Posted by RandyO View Post
    the same reason a golf ball is more aerodynamic than a ping pong ball, the bed is one big dimple
    Actually, the dimpled golf ball is not more aerodynamic, in fact it is slightly less aerodynamic. The dimples simply help the ball's spin create more lift during flight. While a smooth golf ball will not fly as far as a dimpled, it isn't the aerodynamics, it's the lift created. The dimples will give the ball a different trajectory also and keep it better under control in a straight line whereas a smooth ball will "wander" a bit.

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  16. #91
    Development Rider scottieducati's Avatar
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    Re: Happy homeowners pickup

    Quote Originally Posted by Garandman View Post
    Aaaand, it's winter on NES....
    Hey I rode today! Happy homeowners pickup


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  17. #92
    Senior Member jimmycapp's Avatar
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    Re: Happy homeowners pickup

    Quote Originally Posted by Falko View Post
    Actually, the dimpled golf ball is not more aerodynamic, in fact it is slightly less aerodynamic. The dimples simply help the ball's spin create more lift during flight. While a smooth golf ball will not fly as far as a dimpled, it isn't the aerodynamics, it's the lift created. The dimples will give the ball a different trajectory also and keep it better under control in a straight line whereas a smooth ball will "wander" a bit.
    You're both half right.

    How do dimples in golf balls affect their flight? - Scientific American

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  18. #93
    Day late, dollar short carsick's Avatar
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    Re: Happy homeowners pickup

    Quote Originally Posted by Garandman View Post
    Aaaand, it's winter on NES....
    Also winter on NESR. Although I could use a bit more cold, this rain is harshing my ice mellow.

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  19. #94
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    Re: Happy homeowners pickup

    Quote Originally Posted by carsick View Post
    Also winter on NESR. Although I could use a bit more cold, this rain is harshing my ice mellow.
    But think of the glass you'll be able to ride on when it freezes

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  20. #95

    Re: Happy homeowners pickup

    love it when the nesr thread derailment is organic and natural

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  21. #96
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    Re: Happy homeowners pickup

    Quote Originally Posted by jimmycapp View Post
    "Turbulent boundary layer that clings to the surface". That goes against much of what fluid dynamics principles state. Laminar flow typical is seen as that clinging to the surface, hence high performance boats will lightly sand the surface of the gel coat so the water has less adhesion. I know what they are trying to get to, less tail length and less low pressure behind the ball. I'll stick with what I said.

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  22. #97
    Angry Gumball RandyO's Avatar
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    RandyO
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  23. #98
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    Re: Happy homeowners pickup

    I just got a 2016 GMC Sierra 1500 double cab all terrain edition and I love it. They have some crazy incentives, minimum 20% off. I lease mine, $50K truck and I am only paying $450/ month, including taxes, no money down on a 39 month lease

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  24. #99
    Lifer Falko's Avatar
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    Re: Happy homeowners pickup

    5.3 or 6.2?

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    Dad's Dream: Earn enough money to live the life that his wife and kids do.

  25. #100
    Senior Member jimmycapp's Avatar
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    Re: Happy homeowners pickup

    Quote Originally Posted by Jewcati View Post
    I just got a 2016 GMC Sierra 1500 double cab all terrain edition and I love it. They have some crazy incentives, minimum 20% off. I lease mine, $50K truck and I am only paying $450/ month, including taxes, no money down on a 39 month lease
    Mileage allowance?

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