WRC Finland on at 11 pm!

**G.Irish** · 08-07-2005, 09:10 PM

You know that WRC event with all the ridiculously big jumps? Yeah its this one and its on tonight on Speed. Watch bitches!

Myuki · 08-08-2005, 02:14 AM

damn, those jumps were Xbox huge. and that WRX got tossed when he jumped without his huge wing on stage 8 or 9. Some jumps up to 50 meters.

Tere were tough stages, good job to the top finishers for enduring all the pounding their cars were taking.

20 days until the next rally, on the winding roads of germany.

**G.Irish** · 08-08-2005, 09:33 AM

Yeah man he very nearly went into an end-over-end on that one. For those that didn't see, Petter Solberg hit a tree and it knocked his trunk off (thus leaving him wingless). The next big jump he went over the car pitched wildy forward without its rear downforce and damned near flipped Confused

hock:

ScottyB · 08-08-2005, 10:23 AM

G.Irish Wrote:The next big jump he went over the car pitched wildy forward without its rear downforce and damned near flipped hock:

wow, i didn't realize those wings made that much downforce, i thought they were more for lateral stability.

i love these two events, finland and germany are my favorite mix of terrain.

Feersty · 08-08-2005, 12:03 PM

Tried to watch it, but got bored.

ScottyB · 08-08-2005, 12:35 PM

Feersty Wrote:Tried to watch it, but got bored.

man, if you get bored watching WRC then i don't know what could keep you interested :!:

**G.Irish** · 08-08-2005, 12:49 PM

I dunno, I could see some people getting bored. On my scale of motorsport excitement WRC would probably be outside of my top 5.

Evan · 08-08-2005, 12:53 PM

interesting about petter. The weight distribution on the Impreza is such that it should pitch back, even without downforce. I wonder if he just hit the yump wrong....

**G.Irish** · 08-08-2005, 01:07 PM

Well you gotta think, he's got a nice front splitter to provide downforce in the front, which is usually balanced by the wing in the back...

Myuki · 08-08-2005, 04:13 PM

wasn't he the same driver that ran above the allowed average speed on like stage 9 or something, to make them have to change the course layout?

Evan · 08-08-2005, 07:19 PM

the splitter only really works when its close to the ground.
and a big purpose of the rear wing is to smooth the laminar flow and reduce drag. its less an instrument of downforce than you think, especially in a rallycar that spends half its time sideways.

i could be wrong of course, i just dont see the lack of a wing in the back to create that situation

Ginger · 08-08-2005, 09:23 PM

Wouldn't an evenly weighted object pitch forward to the ground anyways because of it's arc-like trajectory?

ScottyB · 08-08-2005, 10:37 PM

asteele2 Wrote:Wouldn't an evenly weighted object pitch forward to the ground anyways because of it's arc-like trajectory?

depends on shock valving and spring rates too....alot of off road trucks valve the front shocks very stiff to keep the front end from plunging into the face of a jump (helping jump attitude), and for handling reasons as well of course

oh yeah, i say it will be a year or less until somebody tries to strap the suby-style wing with all the vertical slats on the back of their civic, home-made or not :lol:

mpg9999 · 08-08-2005, 11:00 PM

asteele2 Wrote:Wouldn't an evenly weighted object pitch forward to the ground anyways because of it's arc-like trajectory?

A parabolic trajectory wont cause it to change the pitch. If the cg is in the middle and ignoring air restistance I'm pretty sure it will maintain the same pitch it had when it left the ground.

**G.Irish** · 08-08-2005, 11:01 PM

Evan Wrote:the splitter only really works when its close to the ground.
and a big purpose of the rear wing is to smooth the laminar flow and reduce drag. its less an instrument of downforce than you think, especially in a rallycar that spends half its time sideways.

That's good point about the splitter, totally forgot about that.

But still, it couldn't have been a coincidence that Petter knocked off his wing then on the next big jump he nose dived.

Also on the downforce and the cars going sideways, that's why they have those vertical strakes on the wings now. I think I read that in Rally XS or something.

Evan · 08-08-2005, 11:22 PM

very true, and a data point Im not ignoring. Probably not a coincidence, which is why Im a bit confused. Everything Ive read and seen about the impreza suggests otherwise. Even the Grp N WRXes with no wing would pitch slightly up when jumping

SWRT said when they released the 04 spec car with that the vertical strakes smoothed the airflow coming off the wing creating less turbulence and less drag, although i suppose that could still provide a bit of downforce when sideways by catching and redirecting air straight over the wing

Maengelito · 08-08-2005, 11:23 PM

evo MR's have them as well on the roof next to the rear glass. they're diffusers which straighten out the air flow to cause less turbulence and less drag

**G.Irish** · 08-08-2005, 11:33 PM

Evan Wrote:SWRT said when they released the 04 spec car with that the vertical strakes smoothed the airflow coming off the wing creating less turbulence and less drag, although i suppose that could still provide a bit of downforce when sideways by catching and redirecting air straight over the wing

Racecar Engineering had an article about the effect of end plates on the air flow on the rear wings of F1 cars. Basically it was saying that the end plate prevents vortex formation close to the wing. Vortices apparently increase drag and reduce downforce when they disrupt the flow on the wing.

I suppose that really doesn't add anything, we need an Aerospace Engineer on this forum.

Maengelito · 08-08-2005, 11:40 PM

i do have a wind tunnel. i dont think you want to do any testing on it though. your car wont be very clean afterwards

mpg9999 · 08-09-2005, 12:34 AM

G.Irish Wrote:
Evan Wrote:SWRT said when they released the 04 spec car with that the vertical strakes smoothed the airflow coming off the wing creating less turbulence and less drag, although i suppose that could still provide a bit of downforce when sideways by catching and redirecting air straight over the wing

Racecar Engineering had an article about the effect of end plates on the air flow on the rear wings of F1 cars. Basically it was saying that the end plate prevents vortex formation close to the wing. Vortices apparently increase drag and reduce downforce when they disrupt the flow on the wing.

I suppose that really doesn't add anything, we need an Aerospace Engineer on this forum.

I know a few, and one of them is going to grad school to study vortices. I can forward any specific questions you may have Smile

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