McLaren MCL39

[mwillems]

The tighter and slippier you can make your car, the more air you can get to the rear to increase downforce. It's a double win.

Hot air to energise the flow , smaller exhaust area to increase coanda effect, area inside the rear wing shaped to catch more flow and a streamlined package in front to deliver the airflow.

The hot air from outlets will not be anywhere near hot enough to energise the flow, nor will it be powerful enough to produce a jet (hence coanda effect not relevant) after passing through radiators etc

They have the cooling outlet at the suspension because it's an efficient solution with high energy air aiding extraction and the losses pass in between BW and RW, not about powering up aero devices etc

Fair play, though coanda was reference to the tightening of the rear area and not the hot air. This would increase airflow to the rear?

[the EDGE]

The tighter and slippier you can make your car, the more air you can get to the rear to increase downforce. It's a double win.

Hot air to energise the flow , smaller exhaust area to increase coanda effect, area inside the rear wing shaped to catch more flow and a streamlined package in front to deliver the airflow.

The hot air from outlets will not be anywhere near hot enough to energise the flow, nor will it be powerful enough to produce a jet (hence coanda effect not relevant) after passing through radiators etc

They have the cooling outlet at the suspension because it's an efficient solution with high energy air aiding extraction and the losses pass in between BW and RW, not about powering up aero devices etc

Fair play, though coanda was reference to the tightening of the rear area and not the hot air. This would increase airflow to the rear?

yes, The blown diffuser had nothing to do with the heat of the exhaust, it utilised the speed of the gas coming out of the exhaust pipe.

The Coanda effect wasn't about tightening the rear, it was utilising a curved surface to attach the exhaust gas to change the direction of flow... ie the Coanda effect

[mwillems]

The hot air from outlets will not be anywhere near hot enough to energise the flow, nor will it be powerful enough to produce a jet (hence coanda effect not relevant) after passing through radiators etc

They have the cooling outlet at the suspension because it's an efficient solution with high energy air aiding extraction and the losses pass in between BW and RW, not about powering up aero devices etc

Fair play, though coanda was reference to the tightening of the rear area and not the hot air. This would increase airflow to the rear?

yes, The blown diffuser had nothing to do with the heat of the exhaust, it utilised the speed of the gas coming out of the exhaust pipe.

The Coanda effect wasn't about tightening the rear, it was utilising a curved surface to attach the exhaust gas to change the direction of flow... ie the Coanda effect

Right, but if the central area that the air attaches to is tighter then isn't it increasing the amount of airflow it can bring to the rear?

More air coming over the diffuser then sucking more air out, increasing downforce?

I wasn't mentioning blown diffuser. I was thinking the warm air on the surface in that area would become the boundary layer and help the airflow progress to the rear.

[organic]

Fair play, though coanda was reference to the tightening of the rear area and not the hot air. This would increase airflow to the rear?

yes, The blown diffuser had nothing to do with the heat of the exhaust, it utilised the speed of the gas coming out of the exhaust pipe.

The Coanda effect wasn't about tightening the rear, it was utilising a curved surface to attach the exhaust gas to change the direction of flow... ie the Coanda effect

Right, but if the central area that the air attaches to is tighter then isn't it increasing the amount of airflow it can bring to the rear?

More air coming over the diffuser then sucking more air out, increasing downforce?

As far as I understand it, the shaping of this region is more about a balance between optimisation of duct exits, managing upstream losses and pressure recovery, rather than increasing volume of airflow over diffuser. As teams have gained more understanding about how to manage cockpit, mirror losses etc they are able to tighten the bodywork inwards to achieve lower drag

[mwillems]

yes, The blown diffuser had nothing to do with the heat of the exhaust, it utilised the speed of the gas coming out of the exhaust pipe.

The Coanda effect wasn't about tightening the rear, it was utilising a curved surface to attach the exhaust gas to change the direction of flow... ie the Coanda effect

Right, but if the central area that the air attaches to is tighter then isn't it increasing the amount of airflow it can bring to the rear?

More air coming over the diffuser then sucking more air out, increasing downforce?

As far as I understand it, the shaping of this region is more about a balance between optimisation of duct exits, managing upstream losses and pressure recovery, rather than increasing volume of airflow over diffuser

The warm.air won't become a boundary layer?

Help me understand. I've read before on this forum the benefits of a boundary layer formed from cooling exits, but perhaps I misunderstood. I thought a cooler boundary layer slowed airflow in the immediate vicinity...

Energise was the wrong word, I should have said it would reduce turbulence and allow airflow to move more freely to the rear.

Faster airflow over the diffuser improving downforce etc..

[the EDGE]

Fair play, though coanda was reference to the tightening of the rear area and not the hot air. This would increase airflow to the rear?

yes, The blown diffuser had nothing to do with the heat of the exhaust, it utilised the speed of the gas coming out of the exhaust pipe.

The Coanda effect wasn't about tightening the rear, it was utilising a curved surface to attach the exhaust gas to change the direction of flow... ie the Coanda effect

Right, but if the central area that the air attaches to is tighter then isn't it increasing the amount of airflow it can bring to the rear?

More air coming over the diffuser then sucking more air out, increasing downforce?

I wasn't mentioning blown diffuser. I was thinking the warm air on the surface in that area would create a boundary layer and help the airflow progress to the rear.

Well I wish I hadn't of chimed in now, as that is beyond my knowledge TBH

[mwillems]

yes, The blown diffuser had nothing to do with the heat of the exhaust, it utilised the speed of the gas coming out of the exhaust pipe.

The Coanda effect wasn't about tightening the rear, it was utilising a curved surface to attach the exhaust gas to change the direction of flow... ie the Coanda effect

Right, but if the central area that the air attaches to is tighter then isn't it increasing the amount of airflow it can bring to the rear?

More air coming over the diffuser then sucking more air out, increasing downforce?

I wasn't mentioning blown diffuser. I was thinking the warm air on the surface in that area would create a boundary layer and help the airflow progress to the rear.

Well I wish I hadn't of chimed in now, as that is beyond my knowledge TBH

Chime away.
It should be what this place is about. Saying something not quite right is the best way to learn. I'm far from an expert but I do think in this instance there will be a minor benefit from the warm air creating a smoother and faster boundary layer so my original thinking feels correct in that this will allow some airflow to.move faster than it previously did and help extract more from the diffuser.

[f1rules]

Are we maybe seing the result of a chassis/packaging master, how much better the chassis has become? I think this would be more visible during long run

[emp]

Are we maybe seing the result of a chassis/packaging master, how much better the chassis has become? I think this would be more visible during long run

Yes, I think so. Also, I think we can see the extensive knowledge that Rob Marshall brings. I don't know why, but for me this car has a hint of old Newey Red Bull. Different shapes, aggressive, novelty, eye catcher.

[LeveragedTiger]

https://i.imgur.com/98mvI3r.png

The usual caveat that angles make comparison difficult, but it does appear to me like McLaren have increased the amount of lateral volume in the floor around the beginning of the boat tail section.

[CjC]

https://x.com/patryksoko/status/1894829375406682346

"XD what McLaren revealed in MCL39 xD I'll post it soon"

https://x.com/patryksoko/status/1894831553441644828

"If I don't post it, I'm sure no one will find it at least until the middle of the season XD"

Patryk (ex mclaren aero) seems to have spotted something interesting on the car, I've been combing through pictures can't seem that "thing" could be the hidden innovative element Zak has been referring to

Did anything come of this?

[FittingMechanics]

https://x.com/patryksoko/status/1894829375406682346

"XD what McLaren revealed in MCL39 xD I'll post it soon"

https://x.com/patryksoko/status/1894831553441644828

"If I don't post it, I'm sure no one will find it at least until the middle of the season XD"

Patryk (ex mclaren aero) seems to have spotted something interesting on the car, I've been combing through pictures can't seem that "thing" could be the hidden innovative element Zak has been referring to

Did anything come of this?

He commented later on that it's not double diffusor (I guess someone asked) and then said he won't post about it now and be will let paid experts point it out.

[CjC]

https://x.com/patryksoko/status/1894829375406682346

"XD what McLaren revealed in MCL39 xD I'll post it soon"

https://x.com/patryksoko/status/1894831553441644828

"If I don't post it, I'm sure no one will find it at least until the middle of the season XD"

Patryk (ex mclaren aero) seems to have spotted something interesting on the car, I've been combing through pictures can't seem that "thing" could be the hidden innovative element Zak has been referring to

Did anything come of this?

He commented later on that it's not double diffusor (I guess someone asked) and then said he won't post about it now and be will let paid experts point it out.

Oh right ok, thanks for the update even though it was slightly disappointing

[Brahmal]

Couldn't find a great picture, but the side intake duct is sculpted into the monocoque quite a bit. I reckon most teams have their radiators partially buried inside the chassis line, but maybe McLaren more than most.

[f1rules]

I think he answered now
https://x.com/patryksoko/status/1895323 ... ltZ__0SqGQ

"F1TV pro showed some great close-ups of the MCL39 from the front and what immediately caught my eye was that the steering rod is not behind the rear wishbone like the MCL38 and Mercedes W16, but in the middle, between the wishbone legs. Bizarre and unique suspension geometry"

https://x.com/patryksoko/status/1894829375406682346

"XD what McLaren revealed in MCL39 xD I'll post it soon"

https://x.com/patryksoko/status/1894831553441644828

"If I don't post it, I'm sure no one will find it at least until the middle of the season XD"

Patryk (ex mclaren aero) seems to have spotted something interesting on the car, I've been combing through pictures can't seem that "thing" could be the hidden innovative element Zak has been referring to

Did anything come of this?

He commented later on that it's not double diffusor (I guess someone asked) and then said he won't post about it now and be will let paid experts point it out.