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Re: End plates for rear flip-ups
Posted: 24 Mar 2009, 21:35
by kilcoo316
alelanza wrote:Sorry to revive this one, but can anyone confirm that a forward rotating tyre on an open wheel car would produce downforce as the flow over it slows down/pressure increases?
And if so, is it significant?
TIA
Negative on that one.
It produces lift, not downforce.
The drag is very significant - probably the single largest contributor on the car.
I'm not sure how much lift it produces to be honest, maybe some of the guys that have done SAE/Fstudent work would have a better idea.
Re: End plates for rear flip-ups
Posted: 24 Mar 2009, 21:41
by alelanza
kilcoo316 wrote:alelanza wrote:Sorry to revive this one, but can anyone confirm that a forward rotating tyre on an open wheel car would produce downforce as the flow over it slows down/pressure increases?
And if so, is it significant?
TIA
Negative on that one.
It produces lift, not downforce.
The drag is very significant - probably the single largest contributor on the car.
I'm not sure how much lift it produces to be honest, maybe some of the guys that have done SAE/Fstudent work would have a better idea.
Got it, do you know the principle behind getting lift on this one?
Thanks again.
Re: End plates for rear flip-ups
Posted: 24 Mar 2009, 21:59
by kilcoo316
alelanza wrote:Got it, do you know the principle behind getting lift on this one?
Thanks again.
Stagnation point is toward the bottom of the wheel due to the rotating. Hence a lot of the air is forced over the wheel - Bernoulli takes care of the rest.
There can be little suction from the surface touching the ground anyway.
Re: End plates for rear flip-ups
Posted: 25 Mar 2009, 01:34
by alelanza
kilcoo316 wrote:alelanza wrote:Got it, do you know the principle behind getting lift on this one?
Thanks again.
Stagnation point is toward the bottom of the wheel due to the rotating. Hence a lot of the air is forced over the wheel - Bernoulli takes care of the rest.
There can be little suction from the surface touching the ground anyway.
Thanks mate!