Quote:
Originally Posted by Cd
Phil, I have asked this once before on a more dedicated thread to this car, but can you speak more in depth about how it is that the Probe iv can attain such a good Cd with such steep and rounded edges at the rear of the car ?
The car seems to be designed backwards ! |
I think the Probe IV was Cd 0.154.Hucho says this is an easy number to achieve with much latitude in form.
The IV was essentially non-aspirated in front with boundary layer control on the sides with the cooling sys./AC inlets and wake-ducted outlets (that's cheating!).
The IV also used active suspension to not only lower the car,but also modify the rake (also cheating),both of which would violate all SAE approach,ramp,and breakover clearances.
If we cheat like Ford did we could benefit as well.
At Cd 0.154 there's still fruit on the tree.As we move closer to Jaray's pumpkin seed of 1921 we approach the finish line.
Hucho says,that to go lower,you've got to extend the car closer to the 5:1 L/H ratio which is what they did with Probe V.(this car is almost double-ended).