McLaren MP4-26 Mercedes

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BreezyRacer
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Re: McLaren MP4-26 Mercedes

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Owen.C93 wrote:I wouldn't have thought you would want exhaust flow going to the beam wing, otherwise you start creating low pressure over the diffuser. Yeah it will help, but I would think that blowing it over the diffuser would work much better.
Correct .. the beam wing is fine .. it's the diffuser that needs the energy to work. The wing only needs free air flow, which they have.

Derek
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Re: McLaren MP4-26 Mercedes

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BreezyRacer wrote:
Owen.C93 wrote:I wouldn't have thought you would want exhaust flow going to the beam wing, otherwise you start creating low pressure over the diffuser. Yeah it will help, but I would think that blowing it over the diffuser would work much better.
Correct .. the beam wing is fine .. it's the diffuser that needs the energy to work. The wing only needs free air flow, which they have.

Thanks for the reply's Iam very new to this and just want to learn
as much as I can

Just one question tho would there new sidepods change anything
With regards to blowing on the beam

Just an idea

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N12ck
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Re: McLaren MP4-26 Mercedes

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i think this is quite funny, lets play the game, guess where the exhaust is

so far we have about 4 different places, maybe we are all right and they are just testing which is best?
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mclaren113
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Re: McLaren MP4-26 Mercedes

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I found it guys. You can see it clearly here, just below the wide rear wishpon!


Image

BreezyRacer
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Re: McLaren MP4-26 Mercedes

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Well the whole goal is to provide cleaner airflow to the beam wing and over the diffuser. For the last few years McLaren has had a bulky tail area. When this new design is compared against it's previous designs I'm sure it's better in that respect. however, compare it to the class of field like Red Bull I'm thinking "no". But that's only speculation. Answering those kinds of questions is why we race!

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adrianjordan
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Re: McLaren MP4-26 Mercedes

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myurr wrote:
segedunum wrote:Still thinking out loud on the subject of those sidepods, and probably for my own benefit..... There's really two things you want to do with the air going towards the back of the car:

1. Get as large a volume of clear air to the back and to the diffuser as you can. That's why you see lots of extreme packaging solutions, new gearboxes and pull-rod suspensions these days.

2. Accelerate that air as best you can over your bodywork surfaces before reaching the rear of the car to ceate more downforce when it reaches there.

Now, with McLaren's sidepod arrangement they've obviously thought a lot about 1. They've made deep cuts into their sidpods to get a larger volume of air to the rear of the car. However, I can't see where they've thought about 2 - accelerating and energising that air as best they can. They've just got two straight channels as far as I can see without doing anything else.

On other cars with their sidepods and bodywork you see intricate curves and deep undercuts to try and create pressure points and accelerate most of that air as best they can before it reaches the rear of the car. Because of what McLaren have done they obviously can't curve the outer parts of their sidpods and create undercuts as other teams have done because they don't have the space.

It might well all work fine as long as they're doing something major with that volume of air once it reaches the back of the car, but they're asking a lot of whatever it is they're doing there.
I don't think accelerating the air over the top surface of the car is what they want to do - my understanding is that this would reduce the pressure and lessen the downforce generated by the floor (the pressure difference between the two would be reduced).
You are correct. In fact if you look at the cross-section of a simple aircraft wing, the top surface will be curved whilst the bottom will be flat. The air travelling over the top has to travel further and so flows at a faster rate. This results in the air pressue above the wing being lower than that below the wing - hence lift. This is basically how aircraft stay in the air.

Actually it's always surprised me that no-one has tried to generate downforce by having a flat top to the sidepod and a curved bottom to them with a gap below to the floor - although I need to look closer at this year's Toro Rosso as perhaps that is what they are doing.
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Pierce89
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Re: McLaren MP4-26 Mercedes

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JaymzVsTheWorld wrote::lol: It's funny you people trying to understand F1 aerodynamics when you really DO NOT HAVE A CLUE!
Dude, there're some seriously intelligent and experienced race folk in this forum. Just because you can't understand F1 aero doesn't mean noone else here can. I'm in the middle of a mechanical engineering degree(with two papers completed on race aero) with years of amateur racing experience, if that doesn't let you start to understand aero, then what does? By the way, there're plenty of people here with much better credentials than mine.
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Giblet
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Re: McLaren MP4-26 Mercedes

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Are those wires fibre optic cables?

They do look like them, but usually they are shielded.
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Owen.C93
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Re: McLaren MP4-26 Mercedes

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[...]


Button's 20 lap stint looked good, faster than Vettel's at least, with similar dramatic drop off near the end.
Last edited by Steven on 13 Feb 2011, 23:57, edited 1 time in total.
Reason: Removed comment on deleted post
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forty-two
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Re: McLaren MP4-26 Mercedes

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Giblet wrote:Are those wires fibre optic cables?

They do look like them, but usually they are shielded.
Sorry Giblet, what wires? Do you have a pic?
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Remote_Access
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Re: McLaren MP4-26 Mercedes

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adrianjordan wrote:You are correct. In fact if you look at the cross-section of a simple aircraft wing, the top surface will be curved whilst the bottom will be flat. The air travelling over the top has to travel further and so flows at a faster rate. This results in the air pressue above the wing being lower than that below the wing - hence lift. This is basically how aircraft stay in the air.

Actually it's always surprised me that no-one has tried to generate downforce by having a flat top to the sidepod and a curved bottom to them with a gap below to the floor - although I need to look closer at this year's Toro Rosso as perhaps that is what they are doing.
Just for your info: the primary mechanism creating lift is not the difference in surface length as you mentioned. That is a common misconception. See: http://en.wikipedia.org/wiki/Lift_%28fo ... ansit-time

The reason they don't sculpt the sidepods in that way is because the downforce is created by the difference in pressures acting on the highest and lowest points of the car. So whilst an inverted aerofoil may create a low pressure region under the sidepod, it is still above the floor and will pull the floor upwards to cancel itself out.

I believe the "double floor" of the TR, if it's accurate to call it that, is to supply clean air to the rear. One of several options on the grid now.

thestig84
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Re: McLaren MP4-26 Mercedes

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mclaren113 wrote:I found it guys. You can see it clearly here, just below the wide rear wishpon!


Image
Your are right they are there BUT that is only one config they are running. The most basic one at that.

JaymzVsTheWorld
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Re: McLaren MP4-26 Mercedes

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OMG that looks like a rubbish design. I'm worried it might be underdeveloped.
N12ck wrote:i think this is quite funny, lets play the game, guess where the exhaust is

so far we have about 4 different places, maybe we are all right and they are just testing which is best?
True it's frustrating. Well that's what we get for getting so involved. Remember the days when we would just watch the race and that was it!
Last edited by JaymzVsTheWorld on 13 Feb 2011, 17:16, edited 1 time in total.

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zgred
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Re: McLaren MP4-26 Mercedes

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Image

Just_a_fan
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Re: McLaren MP4-26 Mercedes

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adrianjordan wrote: You are correct. In fact if you look at the cross-section of a simple aircraft wing, the top surface will be curved whilst the bottom will be flat. The air travelling over the top has to travel further and so flows at a faster rate. This results in the air pressue above the wing being lower than that below the wing - hence lift. This is basically how aircraft stay in the air.

Actually it's always surprised me that no-one has tried to generate downforce by having a flat top to the sidepod and a curved bottom to them with a gap below to the floor - although I need to look closer at this year's Toro Rosso as perhaps that is what they are doing.
Have you looked at aircraft wings in ground effect? Ground effect affects the way these perform. F1 cars are ground effect devices. Tip: stuff on aircraft doesn't necessarily transfer obviously to ground effect cars...

The Torro Rosso won't generate downforce directly from the sidepod undercut because any pressure reduction below the sidepod will also affect the top of the floor. The undercut sidepod is all about airflow to the rear of the car.

The last cars that used the underside of the sidepod to directly create downforce was the old "ground effect cars" e.g. the Lotus 79.
Last edited by Just_a_fan on 13 Feb 2011, 18:01, edited 1 time in total.
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