Radical SR9 LMP2 - Page 4

JohnMiller · 15 Dec 2006, 13:39 (Ref:1791424)

The car certainly had an off later in the day.

Tim the Grey · 15 Dec 2006, 13:44 (Ref:1791428)

Plus the section in front of the driver is 'smoother', fewer angles, more curves.
And the extreme nose looks blunter?

Well spotted, whoever!

zac510 · 15 Dec 2006, 14:13 (Ref:1791449)

Quote:

Originally Posted by AstonGeoff

Look at the middle picture, then look at http://groups.msn.com/DoughtyPics/wh...o&PhotoID=1088

You'll notice that the area between the front wheel arche and the nose is different, it's had the 'bridge' section removed. Probaly more re-profiling too.

Or am i seeing things???

I can't see that picture at work so I'll take your word for it

MulsanneMike · 15 Dec 2006, 18:42 (Ref:1791636)

Quote:

Originally Posted by AstonGeoff

Look at the middle picture, then look at http://groups.msn.com/DoughtyPics/wh...o&PhotoID=1088

You'll notice that the area between the front wheel arche and the nose is different, it's had the 'bridge' section removed. Probaly more re-profiling too.

Or am i seeing things???

Well the valence panel is defenitely removed, not sure about anything else...sure hope they weren't into cooling issues...in December...

Tim Dunlop · 15 Dec 2006, 22:20 (Ref:1791792)

Hi there,

The car was definately running two different nose sections : -

According to a reply from GT3 driver Sean Edwards who replied to my post on Pistonheads regarding yesterdays testing the car was involved in an accident later in the day. Phil Keen went out in the Radical SR9 LMP2 and an MG got in his way, lots of damage to both cars apparently.

Regards

Tim

zac510 · 15 Dec 2006, 22:26 (Ref:1791801)

Thanks Tim, that angle shows the differences a lot better

**FIRE** · 16 Dec 2006, 12:44 (Ref:1792085)

Quote:

Originally Posted by Tim Dunlop

Also spotted this guy hanging around the Radical LMP2. I am not sure who this is but I think it could be the Mercedes DTM driver Stefan Mucke.

Was he only hanging around or did he really test the Radical?

MulsanneMike · 16 Dec 2006, 17:55 (Ref:1792218)

Quote:

Originally Posted by zac510

Thanks Tim, that angle shows the differences a lot better

I'll be honest, I see no difference between the two. And indeed I hear the differences are to the front diffuser/splitter only, not upper surface bodywork.

class4v · 17 Dec 2006, 09:56 (Ref:1792593)

Mike,

You need some glasses

PeterElleray · 17 Dec 2006, 11:56 (Ref:1792742)

class4v - Mike's eyes are fine.... Ofcourse it can clearly be seen that the roof panels (as they are known) have been removed in one picture. Mike probably thought that issue had already been dealt with. What he means - because he's already asked me - is that the 'front cover' is just as standard front cover without any reprofiling. Anything you may think you see is just a trick of the light, or unfamiliar because the roof panel normally covers it up.

OK - next question . Why did Shorty remove the roof panels? Ans: Because i asked him to.

Peter

Hammerdown · 17 Dec 2006, 12:25 (Ref:1792762)

Next question: Why?

PeterElleray · 17 Dec 2006, 14:22 (Ref:1792852)

That didnt take very long did it...

To check that it was behaving as its supposed to.

dj choc ice · 17 Dec 2006, 14:25 (Ref:1792854)

maybe the roof panels being removed would help the aerodynamics as it would reduce the drag at the front/mid section of the car?

its just a hunch but looking at the car it seems air would flow better either side of the cockpit area.

PeterElleray · 17 Dec 2006, 14:42 (Ref:1792860)

no, far more subtle than that. The roof panels have two jobs. first, they make the car legal, without them you would be able to see the top of the floor from above and this is no longer allowed. Creations louvres, Lola's similar panel, porsches 'wing', these all fulfill that role. second, they act as flow conditioners and they play a role in the balance front/rear, and also the cooling.

peter

Hammerdown · 17 Dec 2006, 15:13 (Ref:1792869)

And are they working properly?

I'm sure your roof panels don't have a 'wing' profile, do they!

Always found the louvres in them rather strange. Are they for flow conditioning? Is the effect you're producing here similar to the Porsche 'wing' arrangement.

I'm also puzzled by the Creation louvre arrangement. As far as you know, does it take all it's cooling air in through the raised nose?

Question to yourself (maybe) and 'Mulsanne Mike'. Are we going to get a nice in-depth tech piece about the Radical at some point?

MulsanneMike · 17 Dec 2006, 15:41 (Ref:1792876)

Quote:

Originally Posted by Hammerdown

And are they working properly?

I'm sure your roof panels don't have a 'wing' profile, do they!

Always found the louvres in them rather strange. Are they for flow conditioning? Is the effect you're producing here similar to the Porsche 'wing' arrangement.

I'm also puzzled by the Creation louvre arrangement. As far as you know, does it take all it's cooling air in through the raised nose?

Question to yourself (maybe) and 'Mulsanne Mike'. Are we going to get a nice in-depth tech piece about the Radical at some point?

Whenever Peter wants to open up about it...I'm all ears...I photographed the car at Petit, but figure I have a back log of close to 9 months. Been unable to source the usual photo standard for on-track imagery as well as having documentation holes in other various areas. My usual photograhper isn't cooperating! Anyhow, at some point expect new pages on Creation, Zytek, Lister, RS Spyder, and of course the Radical.

Hammerdown · 17 Dec 2006, 15:54 (Ref:1792882)

Wish we had an Acura powered Radical in the ALMS. I think that combination could probably give the Porsches a good run for their money.

PeterElleray · 17 Dec 2006, 16:09 (Ref:1792885)

OK, since you asked....

Most cars take their cooling air in partially from the conventional 'top of nose ramp' location, and also a significant amount from the diffuser exit. This is why there are some cars with pitch related cooling issues - the diffuser stalls and sends a nice big bubble of stagnant air down the rad duct. I got caught out with this on the very first Bentley in 2001 - because it had been designed as an NA car in 2000 and then gained a turbo engine and two intercoolers. The rads worked fine but the intercoolers , which were fed almost entirely from the diffuser exit, they didnt. The Bentley arrangement from 2003 - and whats on the Audi R10 now, partially alleviates any of this by stuffing high velocity air from the front of the car straight through the suspension and into the rad/intercooler duct. This arrangement takes very little air from the diffuser into the pods, rather it channels that air out below the intakes and through the sides. The two airstreams cross at about 45 deg. It was something we kept fairly quiet about at the time but i think everyone's clocked it now. With a few strategically placed bargeboards (hidden from view) and strakes you get an effect similar to a formula car. If you look at the leading edge of the rad intakes on the doors on the Bentley on Mike's site you will see what i mean.

I guess if you close off the top intake with louvres then you take all of your air from the diffuser exit, yes. I dont know what proportion of the air originally came from the top on the Reynard/DBA/Zytec/Creation.

The louvres in the roof panels are a means of adjusting the balance i talked about, by venting air . No, they are not wing shaped, infact they are single skinned and the top of the 'wing' that you see has no underside internally. They appear to work as intended , yes. The Bentley was exactly the same. The Audi is the opposite.

Not sure about the timescale for a tech article on the Radical - lots of people have been asking almost since day 1. I'm happy to answer stuff for you guys here when i get the time, but please understand somethings i'm going to say i'd rather not go into. We'll see.

Peter

Hammerdown · 17 Dec 2006, 17:21 (Ref:1792916)

Quote:

Originally Posted by PeterElleray

This arrangement takes very little air from the diffuser into the pods, rather it channels that air out below the intakes and through the sides. The two airstreams cross at about 45 deg.

Excellent, thanks for all that!

I assume the snippet above also explains the stepped shape of the sidepod exits on the new Porsche.

Looking forward to those new tech articles, Mike!

bil588 · 8 Jun 2007, 00:43 (Ref:1931827)

Are the new openings in the side for cooling?

http://www.americanlemans.com/Galler...0794243312.JPG

http://www.radicalextremesportscars....ake1/index.php

vorsprung · 20 Aug 2007, 00:26 (Ref:1992409)

Radical tested a new nose in Spa, but used the old one in race. They should have a more developed version in Silverstone. Overall it's very Audi-like, brake cooling duct is now under headlights.
Endurance-Info article and pictures

gwyllion · 20 Aug 2007, 07:57 (Ref:1992525)

They also tested a new shock absorber system: http://www.radicalsportscars.com/new...lti4/index.php

I don't know whether they used it at Spa.

ger80 · 20 Aug 2007, 15:30 (Ref:1992858)

Quote:

The SR9 is seen here on the Multi Matics four poster rig. The Radical works team, headed by Paul Thomas, are carrying out development work on a new three shock absorber system. If we told you any more we would have to kill you!

bil588 · 28 Aug 2007, 04:03 (Ref:1998079)

multimatic from canada?

Graham Goodwin · 28 Aug 2007, 06:59 (Ref:1998144)

Quote:

Originally Posted by bil588

multimatic from canada?

Same company but their UK site

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