Why on GOD's green earth would you not want a spoiler on your car?? When I had my Z up to 185 MPH I don't know what it is in KPH but I know its fast as balls, but if I didn't have my spoiler my car would have spun out of control. Now with those fast as street over across the pond there you would think you would want spoilers on your cars to plant them to the ground when reaching insane speeds. Please enlighten me on why you all take off the bloody spoilers.

agree here too. the Z can look great with a smooth arse, but personally i prefer a sensible spoiler, one that follows the lines of the Z.

 

Ditto that Sky Dive.... ;)

You know i was almost with ya until you started using the bernoulli theory of why lift is developed , its far to simple to say that you have divergent and convergent airflow causing lift and it is also untrue, its just the easiest one to understand , the cross section of a wing that achieved that is the wrong shape to create lift. try looking at the theory of flight using newtons rules

 

I accept that it isn't as simple as that but I was trying to make a point in a simple way to avoid the how come aircraft can fly upside down question, but their you go.

 

Does a bloody great whaletail look good on a road car, nope and I havent seen a single example of one that does.

 

One mans meat is another mans poison. I don't like women with big knockers (more than a handfull is overfacing), but loads of blokes do, but every now and then a nice woman with big freps comes along and I can appreciate what the attraction could be. It all depends what your trying to achieve.

sorry bud wasnt being a twat on purpose , just bad memories of my theory of flight instruction which was taught using bernoulli and me arguing with the instructor and almost failing because i was right and he believed what he was taught.

sorry bud wasnt being a twat on purpose , just bad memories of my theory of flight instruction which was taught using bernoulli and me arguing with the instructor and almost failing because i was right and he believed what he was taught.

oh i see, well iff you say it must be right then :rolleyes: :tongue:

oh i see, well iff you say it must be right then :rolleyes: :tongue:

 

I am glad you agree with me :smash:

fook aerodynamics, seen as i dont drive my zed at 180mph, i would have to go for looks everytime and a smooth backend wins everytime.....

....well till i get bored anyway :wack:

does the spoiler on the zed actually add downforce - i know what a spolier is supposed to do but i had always asumed that nissan just designed the car to look that way

 

regards,

 

alex

 

Stock Z spoiler creates around 35kg of downforce at 112mph :D

lol @ every1's analogy of the theory of flight!

lol @ every1's analogy of the theory of flight!

 

lol you said anal! :dance:

The Newtonian Explanation

 

What is it?

Isaac Newton stated that for every action there is an equal, and opposite, reaction (Newton's Third Law). You can see a good example of this by watching two skaters at an ice rink. If one pushes on the other, both move -- one due to the action force and the other due to the reaction force.

 

 

In the late 1600s, Isaac Newton theorized that air molecules behave like individual particles, and that the air hitting the bottom surface of a wing behaves like shotgun pellets bouncing off a metal plate. Each individual particle bounces off the bottom surface of the wing and is deflected downward. As the particles strike the bottom surface of the wing, they impart some of their momentum to the wing, thus incrementally nudging the wing upward with every molecular impact.

 

Note: Actually, Newton's theories on fluids were developed for naval warfare, in order to help decrease the resistance that ships encounter in the water -- the goal was to build a faster boat, not a better airplane. Still, the theories are applicable, since water and air are both fluids.

 

Why is it not entirely correct?

The Newtonian explanation provides a pretty intuitive picture of how the wing turns the air flowing past it, with a couple of exceptions:

 

1. The top surface of the wing is left completely out of the picture. The top surface of a wing contributes greatly to turning the fluid flow. When only the bottom surface of the wing is considered, the resulting lift calculations are very inaccurate.

 

2. Almost a hundred years after Newton's theory of ship hulls, a man named Leonhard Euler noticed that fluid moving toward an object will actually deflect before it even hits the surface, so it doesn't get a chance to bounce off the surface at all. It seemed that air did not behave like individual shotgun pellets after all. Instead, air molecules interact and influence each other in a way that is difficult to predict using simplified methods. This influence also extends far beyond the air immediately surrounding the wing.

 

Why is it not entirely wrong?

While a pure Newtonian explanation does not produce accurate estimates of lift values in normal flight conditions (for example, a passenger jet's flight), it predicts lift for certain flight regimes very well. For hypersonic flight conditions (speeds exceeding five times the speed of sound), the Newtonian theory holds true. At high speeds and very low air densities, air molecules behave much more like the pellets that Newton spoke of. The space shuttle operates under these conditions during its re-entry phase.

 

Unlike the Longer Path explanation, the Newtonian approach predicts that the air is deflected downward as it passes the wing. While this may not be due to molecules bouncing off the bottom of the wing, the air is certainly deflected downward, resulting in a phenomenon called downwash.

 

How Lift is Created

 

Pressure Variations Caused By Turning a Moving Fluid

Lift is a force on a wing (or any other solid object) immersed in a moving fluid, and it acts perpendicular to the flow of the fluid. (Drag is the same thing, but acts parallel to the direction of the fluid flow). The net force is created by pressure differences brought about by variations in speed of the air at all points around the wing. These velocity variations are caused by the disruption and turning of the air flowing past the wing. The measured pressure distribution on a typical wing looks like the following diagram:

 

 

A. Air approaching the top surface of the wing is compressed into the air above it as it moves upward. Then, as the top surface curves downward and away from the airstream, a low-pressure area is developed and the air above is pulled downward toward the back of the wing.

 

B. Air approaching the bottom surface of the wing is slowed, compressed and redirected in a downward path. As the air nears the rear of the wing, its speed and pressure gradually match that of the air coming over the top. The overall pressure effects encountered on the bottom of the wing are generally less pronounced than those on the top of the wing.

 

C. Lift component

 

D. Net force

 

E. Drag component

 

When you sum up all the pressures acting on the wing (all the way around), you end up with a net force on the wing. A portion of this lift goes into lifting the wing (lift component), and the rest goes into slowing the wing down (drag component). As the amount of airflow turned by a given wing is increased, the speed and pressure differences between the top and bottom surfaces become more pronounced, and this increases the lift. There are many ways to increase the lift of a wing, such as increasing the angle of attack or increasing the speed of the airflow.

basically what i was trying to get at, just couldnt be arsed to write it well done.

Most after-market spoilers look like giant carry handles that God could use to pick the car up from behind and hang it in the cupboard until the Sun comes out again.

 

Then again - if you like doing the ironing on a long journey there are the spoilers that can be seen from the Hubble Telescope.

 

I actually like the 94 stock spoiler - and would only change it if a bewt came along!

 

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Each to their own - i love my high level spoiler, always have done and it was the first thing i did when i bought the car as standard with the stupid rubber thing stuck on it. Was'nt easy ripping old one of, filling holes and respraying tailgate - but it was worth it. :)

does the spoiler on the zed actually add downforce - i know what a spolier is supposed to do but i had always asumed that nissan just designed the car to look that way

 

you are right though - if i was driving around at 185 miles an hour i would probably put on a skyline type or something similar or perhaps that jun "ducks arse" one

 

regards,

 

alex

 

Did someone say Skyline spoiler ;)