New Fiberwerks rear spoiler
12-23-2006, 09:21 PM
#121
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Originally Posted by Rich Sandor
Totally wrong. If you were taking an aerodynamics exam, you'd have failed miserably.
A "spoiler" is a device which spoils the smooth airflow over a surface. Spoiling the airflow, destroys downwash, kills lift, and creates excessive drag. A spoiler can be used on TOP of an airplane's wing, when the pilot needs to descend immediately, or it can be used on the rear of a racecar to spoil the airflow down the back of a car, to eliminate Lift. A spoiler, is almost always a simple rectangular tab which protrudes from the the wing or car's body at varying angles, depending on how effective it needs to be. A spoiler cannot create downforce - it can only cancel out Lift.
A "Wing" is an Airfoil which is specifically shaped to create a low pressure zone on it's top surface, the pressure differential creating LIFT thru the body of the Wing. If you turn it upside down, and place it on a car, it now produces DOWNFORCE.
A wing cannot create lift without smooth unobstructed airflow over it's top surface. The inverted wing on the 968 recieves very turbulent air at a very steep angle, and therefore is totally incapable of producing any pressure differential. It only acts as a spoiler to prevent airflow down the back of the car.
A "spoiler" is a device which spoils the smooth airflow over a surface. Spoiling the airflow, destroys downwash, kills lift, and creates excessive drag. A spoiler can be used on TOP of an airplane's wing, when the pilot needs to descend immediately, or it can be used on the rear of a racecar to spoil the airflow down the back of a car, to eliminate Lift. A spoiler, is almost always a simple rectangular tab which protrudes from the the wing or car's body at varying angles, depending on how effective it needs to be. A spoiler cannot create downforce - it can only cancel out Lift.
A "Wing" is an Airfoil which is specifically shaped to create a low pressure zone on it's top surface, the pressure differential creating LIFT thru the body of the Wing. If you turn it upside down, and place it on a car, it now produces DOWNFORCE.
A wing cannot create lift without smooth unobstructed airflow over it's top surface. The inverted wing on the 968 recieves very turbulent air at a very steep angle, and therefore is totally incapable of producing any pressure differential. It only acts as a spoiler to prevent airflow down the back of the car.
it's like talking to frankenstein here...
first you said removing the spoiler on the 944 increases drag, but above you say that having a spoiler creates "excessive drag" <--- this is a contradiction
you fail to realize that a plane flies because the pressure above it is less than the pressure below it, not because of some imaginary force "lifting" it, still either way you look at it:
negative lift = downforce
you are mixing words not realizing that a negative drag = thrust or a negative downforce = lift, its simple math
in other words, in a macro view of the equation, if you lift something from the top its the same thing as if you get under and push it up from the bottom, although they have measured the pressure to be less above and actually sucking up the wings of airplanes... but the net effect is the same for general purposes.
12-23-2006, 11:11 PM
#122
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Originally Posted by Rich Sandor
simply put, adding the lower spoiler below the wing, would reduce the "form drag" of the car's body, and simultaneously create a narrower passage of air below the wing, which intensifies the low pressure zone, which creates more downforce. More downforce also creates more drag, BUT, you can now reduce the angle of incidence of the wing, so that it creates the same downforce as before, but now with a lower total drag value overall. Do you understand?
