ttarleto@ix.netcom.com wrote:
>
>> A clark Y wing @ 32sq ft = 174 lb at -10 deg of attack and 256 lb
at15 deg
>> THIS IS WITHOUT ANY FLAPS OR GURNEY LIPS.
>> a 23012 wing with a slotted flap run at 40 deg of attack has a Cl of
2.7
>> or 553 lb of force.
>>
>> This is a lot of extra grip on a 1200lb modified car.
>> This is all at 50mph.
Of course that calculation, although correct, only considers a single
element airfoil. The Phantom has three elements on each wing, all set
to different attack angles.
Also recalculate for a max. of 20 sq.ft. and it'll still translate to
even more grip on a sub-800lb. modified car.
"Brent DeWitt" wrote:
>Second, the downforce increases the contact patch area of a wide
compliant tire, making
>ultimate shear stress higher.
A portion of this down force is taken up by suspension compliance so the
contact patch isn't increased all that much. A well tuned autocross
suspension isn't all that stiff. I've seen small cars with tiny
contact patches out-corner big cars with fat tires. Cornering ability
is still a product of good suspension engineering more so than
downforce.
-c.
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