Aerodynamics discussion

[Shankenstein]

Originally Posted by plucas

The window filler probably doesnt do much. Might reduce a little drag but doubting it. I would ventue and say it is cosmetic.

If you're willing to continue the functional vs. cosmetic discussions... what do you think of the Porsche 918 Spyder's fender vent?

I may be building some carbon fenders soon, and this was an interesting feature, considering it isn't placed in either of the low pressure zones that we identified earlier.

[plucas]

Originally Posted by Shankenstein

If you're willing to continue the functional vs. cosmetic discussions... what do you think of the Porsche 918 Spyder's fender vent?

I may be building some carbon fenders soon, and this was an interesting feature, considering it isn't placed in either of the low pressure zones that we identified earlier.

Those are functional. They are designed to bleed high pressure from the fender well to decrease lift.

[zdr93523]

Originally Posted by dasklein

As EarlQ pointed out, Aeromotions has 3 active aero applications that differ by either actuation type (internal/external) or single element vs. split element. We just did a BRZ fitment with our "static" wing which can be seen here: http://aeromotions.com/products/by-c...ic-subaru-brz/

This static fitment can be upgraded to active as well using our external R.Module.

We've also built the active front splitter that you are referring to. We did extensive CFD testing on it, then took it to the WindShear 180mph rolling road wind tunnel where the Nissan Delta Wing was tested. We have some info on it here: http://aeromotions.com/project-cars/...hallenge-aero/

We do implement a Drag Reduction System (DRS) like F1, so that there isn't much of a drag penalty.

One thing to note on our BRZ testing: our airfoil is very unique (even though it looks very basic), and implements a concave pressure recovery system which seems to have a huge benefit with the BRZ shape (the window rake + factory deckled specifically). In static mode, we only need 2 degrees of angle of attack (AoA) to achieve perfect balance. And because of our low drag shape and only needing 2 degrees of AoA, there isn't much of a drag/speed penalty.

The factory BRZ Limited wing is supposed to reduce the C/D by. 01, so would you recommend retaining the OEM spoiler with your R Static wing?

[zdr93523]

Originally Posted by plucas

Those are functional. They are designed to bleed high pressure from the fender well to decrease lift.

What modifications or design features would the fender liner need, if anything, to make this effective?

[Gunman]

Originally Posted by zdr93523

What modifications or design features would the fender liner need, if anything, to make this effective?

Hole, and duct to get the air out. I'd screen it too, so debris doesn't fly out.

[zdr93523]

Originally Posted by Gunman

Hole, and duct to get the air out. I'd screen it too, so debris doesn't fly out.

I was hoping for a more technical answer.

[dradernh]

Originally Posted by zdr93523

I was hoping for a more technical answer.

I believe that is the technical answer.

[zdr93523]

Originally Posted by dradernh

I believe that is the technical answer.

It wasn't, it was a vague response. Not technical or informative.

[civicdrivr]

Originally Posted by zdr93523

It wasn't, it was a vague response. Not technical or informative.

The radius of said hole should be no smaller than .23mm and no larger than 5 yards.

The ducting used should be of a plastic, rubber, carbon fiber, or aluminum construction. Please refrain from using rigatoni or crazy straws, as the airflow may become restricted.

You may use a screen of metal or plastic construction. Pantyhose is fine too, we won't judge.

I don't suggest painters tape as a fastener, as the blue finish may dictate your wardrobe, and that could turn into a thing. I do suggest duct tape, as the silver-gray color is complimentary.

[dradernh]

Originally Posted by civicdrivr

The radius of......the silver-gray color is complimentary.

I had to laugh - that was good.

[Turdinator]

Something I have been wondering is what happens to the aero in our front wheel arches? There has been a lot of talk on the forced induction forums about how to get the hot air out of the engine bay. Could you duct some of the flow through the radiator out the wheel wells?

[Gunman]

Originally Posted by zdr93523

I was hoping for a more technical answer.

How much more technical do you want?

Packaging is going to dictate how big, and where the duct goes. CFD, tunnel time, or other aero studies will let you know if it's too big, or too small.

Getting the air out is the key.

[zdr93523]

Originally Posted by Gunman

How much more technical do you want?

Packaging is going to dictate how big, and where the duct goes. CFD, tunnel time, or other aero studies will let you know if it's too big, or too small.

Getting the air out is the key.

I need to look up what the fender liner and venting system looks like on vehicles that have functional vents. Then we'd have a good concept of how we could apply that concept to our cars.

[plucas]

Originally Posted by zdr93523

What modifications or design features would the fender liner need, if anything, to make this effective?

I would do as large of a hole at the top as possible and only as big as the ducting will allow. Build ducting the narrows (decreasing cross-sectional area) to the outlet. Some sort of gurney or wicker at the outlet for added effect if needed.

I can look in our CAD of the car and see what we can do there.