myurr wrote:myurr wrote:segedunum wrote:Goodness me.
Take a long look at that diagram above and have a look at how much space there is underneath the pull-rod compared with the push-rod that obstructs that space. Given the single diffusers we have now that fit completely into that space then there really is no disadvantage to using a pull-rod this year. Pushing will tend to give you more control and adjustment than pulling but any performance you can gain from that will be small in comparison to the aerodynamic effect of the air you free up.
Ferrari can change the geometry of their rods and wishbones all they like but their push-rod will still be obscuring that space.
Care to highlight on that diagram exactly which space you're referring to?
Further to my request, here is my crude diagram. Green indicates advantage push rod, blue advantage pull rod. Maybe you can show me where I'm going wrong and where this massive aero advantage is
underneath the pull rod.
To me it just looks like two different aero compromises and you choose the best for the rest of your car.
You should take into account the size of the gearbox and also what's behind it. and in front of it. Scarbs diagram was just a demonstation, so he used the same size on both sides. That is not the case in reality.
It's more like this:
Red strokes are bad flow, green is good. Notice how much bigger the cooling exit is for the push rod. Also take note of what proportion of beam wing is exposed to bad flow from the push rod itself and also the suspension parts.
Notice also how much narrower the gearbox is at the top. Williams are extreme example.
The push rod can't do this, it needs structure to take all the forces and also to fit the parts imbetween.
Notice as well the cooling flow area. You can't leave the push rod lump exposed to the free stream, it has to be covered. Secondly, all those dampers and other parts are messing up the flow, so this is also a reason to have a bigger hole in back.
I should have made the pushrod 3 times fatter as well.
Buckling load is related to the length, and Ferrari's push rod is extra fat because of the extra length to place it so far upstream.
What your diagram also fails to demonstrate is the distance to the diffuser of the area you think the pull rod is compromising. The pull rod rocker is pretty far upstream and on the floor. There is no aero disadvantage in that area.
Ask Torro Rosso, who are championing diffuser flow right now. They don't have the compromise on the floor that you are proposing.
No exhaust compromise on the ground as you can see. And this uses a Ferrari engine and KERS to boot.