tail/wings......downforce?
#4
Don't forget the 4 difusers that make it zero lift.
Which mostly boils down to the ones in front of the wheels that push the air down to keep it out of the bumper/rearend.
I don't think the spoiler actually provides and measured downforce. The combination of the diffusers and the spoiler prevent lift. Essentially keeping the weight of the rear static at "any" speed.
Which mostly boils down to the ones in front of the wheels that push the air down to keep it out of the bumper/rearend.
I don't think the spoiler actually provides and measured downforce. The combination of the diffusers and the spoiler prevent lift. Essentially keeping the weight of the rear static at "any" speed.
#5
#6
would you know offhand the amount of downforce, in pounds, at speed.....say 60mph.? just curious
I read yesterday at 186 mph, the 911 GT-3 creates only 55 #'s of downforce with an adjustable Gurney flap. The spoilered G creates no downforce but would have lift without it, creating some instability at the drive wheels. The amount of air that ever gets to the spoiler is apparently quite small for most cars but they work with what they have, those pesky engineers.
The diffusers, I believe, act to move air flow in a way that keeps lift from resulting under the car. Air moving slower under the car creates a wing-like effect, so I guess they route the air more efficeintly around the wheels. No downforce is at play, but the results are the same if lift is avoided.
#7
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Originally Posted by godmans
correct me if I am wrong... coming with aerospace background
I can tell you that it is the job of the spoiler to create downforce; NOT the diffusiors, which mostly act to decrease the amount of turbulent flows generated..
I can tell you that it is the job of the spoiler to create downforce; NOT the diffusiors, which mostly act to decrease the amount of turbulent flows generated..
I've always thought of a spoiler as something that disrupts (modifies) the flow of air.
I don't think our aerodynamics are advanced enough to provide actual downforce. Downforce meaning an actual force pushing down on the vehicle that is independent of gravity. However, I do believe that it is advanced enough to prevent any high pressure zones underneath the car to cause an upward force.
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#8
That's a very good explanation, however, please do also note that the downforce generated from a constant angle spoiler..flap or whatever is dependent on the speed of an object.
Thus, you may say that at 60mph, the spoiler is not advanced enough to provide actual downforce but a 0 lift situation; however, at 120mph, the situation might be a bit different
We will never know w/o a wind tunnel =)
Thus, you may say that at 60mph, the spoiler is not advanced enough to provide actual downforce but a 0 lift situation; however, at 120mph, the situation might be a bit different
We will never know w/o a wind tunnel =)
#10
I don't think our aerodynamics are advanced enough to provide actual downforce. Downforce meaning an actual force pushing down on the vehicle that is independent of gravity. However, I do believe that it is advanced enough to prevent any high pressure zones underneath the car to cause an upward force.
#11
#12
Originally Posted by godmans
correct me if I am wrong... coming with aerospace background
I can tell you that it is the job of the spoiler to create downforce; NOT the diffusiors, which mostly act to decrease the amount of turbulent flows generated..
I can tell you that it is the job of the spoiler to create downforce; NOT the diffusiors, which mostly act to decrease the amount of turbulent flows generated..
#15
I don't think the rear spoiler on the G is intended to create any downforce. It barely has any angle to it. I believe it is only present to shape the air off the back of the car. This is why it protrudes rearward and not upwards.
You'd really need something like the Evo spoiler to get real measurable downforce. something that is low is not going to do a whole lot. The Porsche is case in point. Move it up in the airstream and you would get a lot more downforce. IIRC the Evo has more than that 55# at that speed.
You'd really need something like the Evo spoiler to get real measurable downforce. something that is low is not going to do a whole lot. The Porsche is case in point. Move it up in the airstream and you would get a lot more downforce. IIRC the Evo has more than that 55# at that speed.