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General Temas no técnicos, Saludos y Sugerencias referentes a 4x4 y Offroad.

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Antiguo 18-02-2005, 09:03:59   #11
LAPOSO
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YA po¨

cuanto cuesta !!!

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Antiguo 18-02-2005, 09:20:31   #12
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ha ... una consulta a los expertos:
sirve lo mismo que instalar una lona cubre pick up?
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Antiguo 18-02-2005, 11:00:47   #13
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Cita:
Empezado por LAPOSO
ha ... una consulta a los expertos:
sirve lo mismo que instalar una lona cubre pick up?
Solo que no estas eliminando peso .. de hecho estas agregando el peso de la lona .. aunque depende de como esté confeccionada / colocada puede mejorar significativamente la resistencia ..
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Antiguo 18-02-2005, 11:11:17   #14
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La verdad que no em queda tan claro que sea mas eficiente la malla.

El tema aerodinamico no es tan simple como lo vemos los que no conocemos del tema, y hay ene aspectos que no son como pensamos.

Las bolsas de aire, efectos de presiones, y ene cosas mas hacen que el tema aerodinamico no sea tan simple.

No tengo tan claro que gaste menos con malla, no me extrañaria que el aire del pick up se mueva menos y que el otro se desplace sobre el o al go por el estilo.
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First you crawl, then you walk, then you drive, then you crawl again.......
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Antiguo 18-02-2005, 11:19:28   #15
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Ajaaaah miren lo que encontre:

http://www.awtrucks.com/tailgateup.htm

Dear Tom and Ray:

I'm an aerodynamics engineer. When I was in the U.S. Air Force a few years back, I worked with folks from the Lockheed low-speed wind tunnel.

In the 1970s aircraft production went into a slump, and Lockheed started looking.for other customers for its wind-tunnel services.

Prime candidates were automakers, and Lockheed was successful in convincing Ford, among others, that the wind tunnel wouId help them reduce drag and wind noise on their vehicles.

Needless to say, in the past 15 to 20 years, Lockheed has learned a lot about car and truck aerodynamics.

Anyway, they actually performed drag tests on pickups with the tailgate both up and down, and found that drag was actually LOWER with the tailgate CLOSED!

This ran counter to their intuition (and yours). The reason is that a closed tailgate sets up a large "bubble" of stagnant air that slowly circulates around the bed of the truck (we aero types call this a ("separated bubble"). When air approaches the truck, it "sees" the bubble as part of the truck. So to the air, the truck looks like it has a nice, flat covering over the bed, and the air doesn't "slam" into the vertical tailgate.

If the tailgate is open, or replaced by one of those "air gate" nets, however, that nice, separate bubble in the truck bed does not form (it "bursts").

Then the air approaching the truck "sees" a truck with a flat bed on the back of a tall cab. This is a very nonaerodynamc shape with a very LARGE drag.

So, believe it or not, it's best for gas mileage to keep the tailgate CLOSED. Hope this information is helpful.

Ed Fitzgerald
Research Assistant
Department of Aero/Mechanical Engineering
University of Notre Dame

En palabras simples, las camionetas tienen mejor coeficiente aerodinamico con la tapa que con la malla.
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Suzuki Sj413+2JZ GTE+A340+NP231/TLC Doubler+Irok 36"+Toys 8"+E Lockers+4.3:1+12" ORIs

First you crawl, then you walk, then you drive, then you crawl again.......
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Antiguo 18-02-2005, 11:22:00   #16
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...viste Eduardo que es pura calentura???

Gracias Gonzalo!! :wink:
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Antiguo 18-02-2005, 11:27:26   #17
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Cita:
Empezado por Magonza4x4
...viste Eduardo que es pura calentura???

Gracias Gonzalo!! :wink:
Le creo a Ed Fitzgerald (Parece que sabe de lo que esta hablando)

Efectivamente Marcelo, es pura calentura...
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Antiguo 18-02-2005, 11:28:51   #18
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BUSTED


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First you crawl, then you walk, then you drive, then you crawl again.......
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Antiguo 18-02-2005, 11:31:01   #19
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JAJAJAJAJAJA!!!!! :) :D
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Antiguo 18-02-2005, 13:21:47   #20
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Cita:
Empezado por Gonzalo Bravo
Ajaaaah miren lo que encontre:

http://www.awtrucks.com/tailgateup.htm

Dear Tom and Ray:

I'm an aerodynamics engineer. When I was in the U.S. Air Force a few years back, I worked with folks from the Lockheed low-speed wind tunnel.

In the 1970s aircraft production went into a slump, and Lockheed started looking.for other customers for its wind-tunnel services.

Prime candidates were automakers, and Lockheed was successful in convincing Ford, among others, that the wind tunnel wouId help them reduce drag and wind noise on their vehicles.

Needless to say, in the past 15 to 20 years, Lockheed has learned a lot about car and truck aerodynamics.

Anyway, they actually performed drag tests on pickups with the tailgate both up and down, and found that drag was actually LOWER with the tailgate CLOSED!

This ran counter to their intuition (and yours). The reason is that a closed tailgate sets up a large "bubble" of stagnant air that slowly circulates around the bed of the truck (we aero types call this a ("separated bubble"). When air approaches the truck, it "sees" the bubble as part of the truck. So to the air, the truck looks like it has a nice, flat covering over the bed, and the air doesn't "slam" into the vertical tailgate.

If the tailgate is open, or replaced by one of those "air gate" nets, however, that nice, separate bubble in the truck bed does not form (it "bursts").

Then the air approaching the truck "sees" a truck with a flat bed on the back of a tall cab. This is a very nonaerodynamc shape with a very LARGE drag.

So, believe it or not, it's best for gas mileage to keep the tailgate CLOSED. Hope this information is helpful.

Ed Fitzgerald
Research Assistant
Department of Aero/Mechanical Engineering
University of Notre Dame

En palabras simples, las camionetas tienen mejor coeficiente aerodinamico con la tapa que con la malla.
Impeque el dato GB

Parece inverosimil que actuen dos bolsas de aire en una misma area de contacto como es el bed de un pic up ..
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