Wind Tunnel Testing Round 2 

i guess im randomly asking but does anybody know a trick to get back into an Instagram account..? I somehow forgot my password. I would appreciate any assistance you can give me

@Marc Allen Instablaster =)

@Forrest Messiah thanks so much for your reply. I found the site thru google and I'm waiting for the hacking stuff atm. Looks like it's gonna take a while so I will reply here later with my results.

@Forrest Messiah it worked and I now got access to my account again. I am so happy:D Thanks so much you really help me out :D

@Marc Allen No problem :)

I need to do more of these on the Prelude, I feel like I can get a lot more downforce up front!

@@matsrebuild3511 You can always ask. I have tried about 4 different configurations already. I have a general idea of what works and what doesnt.

The splitter was only a small contributor to lift since once we got some angle into it, we finally made some downforce. The radiator not being ducted allowed copious amounts of air in the engine bay and under the car causing a lot of lift.

AJ Hartman Aero Did the car not have a flat bottom?

@@GoodWillRacing It did not.

Would be cool to work there. I just get to take cool cars there.

En tangled would have liked to but came down to available time so didn’t get a chance.

@@ajhartmanaero Thanks for the reply. This video was so fascinating.

Its not quite that simple cause with side plates, ducted radiator, large louvers, etc, we could have made more Df without changing the splitter angle. So since the tunnel measures total Df, it hard to say just a splitter angle change will be the only change to downforce. But generally you want the splitter atleast level, if not, nose down a tiny bit.

yes.

Shoot me an email if you go. I'd love to go back just to help out. ajhartmanaero@gmail.com

@@ajhartmanaero Thanks, Don't forget we supposed to work on the rear wing, unless you want to do a front splitter 1st to help out with the front down force, let me know I will email you.

RacerXXX / Only racing will do! Email me.

I'd run them if it were my car.

Chris Bouchard I’d put the seal on if you can.

We did side plates on our latest tunnel video. This customer didn’t want to run them. Your second part is false tho. Since it’s a flat splitter leading to a dirty floor, the upward angle was not good. If it was a profiled splitter leading to a flat floor, an open throat to the splitter is beneficial. Details matter.

roastbeefoffroad it should. It’s one of those very rare occasions where we gains downforce AND lost drag.

@@ajhartmanaero nice. how is drag and downforce gains and losses calculated in a wind tunnel? does the car sit on static scales or something?

30mph during the smoke. Static floor isn't the best but still would see changes if we were to do some underbody tests.

AJ Hartman Aero static floor could change the splitter results as well right?

sjpro1 yeah but not as much since it’s the first thing the air hits.

You don’t “want” turbulent flow around the tires, it’s just how it is. As for Louvers, I’m pretty sure you are confused. Taller at the front and shorter towards the rear provided better results.

Time stamp of when I may have said this?

@@ajhartmanaero that’s weird I commented that on a completely different video idk why it’s even here lol sorry for that

$500/hr

Thanks. We didn’t think of that!

It's better than nothing

In this tunnel they can plug in speeds and see what your calculated lift or down force is, watch cleetus McFarlands video the guy explains it in great detail. For example he needs an extra 500 HP to maintain 170 mph because his step is so bad

maybe.

Not sure if an S duct is the same as an S flap, but that's what I was thinking when I saw you block the lower corner of the tire. I know McBeath did a full height S flap in front of the tire that went all the way up to the top of the fenderwell on a BTCC Civic I think, and they tried ramps in front of the tire and then the flap and he was surprised that the flap worked better than the ramps. Anyway, think that would be better than the little 3" flap on top of the splitter. If the car has fenderwells and it's legal, could cut them out in front of the struts to allow air out of the engine compartment too. Air looked really dirty over the rear window too during the smoke testing, like there was a lot of flow separation. VGs might help that situation. Video didn't really show where the separation started, but I'd think you'd want VGs significantly forward of where they are on EVOs due to curvature of the roof. Loved the video. Thanks!!!

@@jonmortensen9990 Yeah we would have loved to play with different size and shapes S flaps but it all comes down to time. I literally found some scrap foam in the back room to fab those up in about 2 minutes. The test you are mentioning I think was in one of McBeaths books cause I remember that exact one. As for the dirty air off the roof, if you look at the guys eyes doing the smoke he looks forward in the tunnel a few times. Since the test was done with the FSAE team there was a lot of people in the tunnel. I think we were causing some of that, especially cause when you see the smoke hit the center of the wing just before the video cut it does get good clean air for a bit.

@@jonmortensen9990 no Ferrari s duct is not same with s flap that you mentioned. Try to look out for Ferrari gtb / 488 pista aerodynamics videos.

Ah, I see, rad duct out the hood. Yeah, I agree, that would improve things a lot. Hadn't heard of S duct. Thanks!

No.

I’d say he is.

My guess would be yes, but not as much.