The relative benefits of a pull rod suspension

Here are our CFD links and discussions about aerodynamics, suspension, driver safety and tyres. Please stick to F1 on this forum.
User avatar
ringo
230
Joined: 29 Mar 2009, 10:57

Re: The relative benefits of a pull rod suspension in 2011

Post

:lol: Predicatable
You've found a voice when you think it's safe to do so. Real slick Politician! :P

You are speaking too soon however. Stay cool until we see what Ferrari has done. It's not the typical solution, so you cannot speak of benefits of something that we haven't seen.

Remember whether the rod points up or down is not the issue. It's the location of the working parts.

You are too focused on proving me wrong, when in fact i made it clear that by knowing both, a choice can be made. I would still go with what i know; which is the pull rod having 3 benefits.

Whether Ferrari's new solution compensates we will see.
Maybe Ferraris is better in a comparison and everyone copies Ferrari in 2012?
All that matters is which one is advantageous for the given regulations. As it stands a few races are needed to prove that.
But going by trends of 2009 and 2010, redbull weren't complaining.

So myurr, now that you are fully convinced, which one would you chose, and tell me the disadvantage of the pull rod in ferrari's case? :wink:
For Sure!!

User avatar
ringo
230
Joined: 29 Mar 2009, 10:57

Re: The relative benefits of a pull rod suspension in 2011

Post

Image
just documenting the different solutions in the thread.
For Sure!!

myurr
myurr
9
Joined: 20 Mar 2008, 21:58

Re: The relative benefits of a pull rod suspension in 2011

Post

ringo wrote::lol: Predicatable
You've found a voice when you think it's safe to do so. Real slick Politician! :P
WTF!? I've been saying the same thing to you consistently and constantly. You said wait until the cars are launched, now you're saying wait until the first race.

You're the one saying that pull rod was a no brainer and that teams shouldn't ask questions they should just use it, no ifs or buts, as it has no downsides. You're the one that said that Ferrari were going to run a push rod setup. You're the one with egg all over your face now trying to backtrack.
ringo wrote:You are speaking too soon however. Stay cool until we see what Ferrari has done. It's not the typical solution, so you cannot speak of benefits of something that we haven't seen.

Remember whether the rod points up or down is not the issue. It's the location of the working parts.

You are too focused on proving me wrong, when in fact i made it clear that by knowing both, a choice can be made. I would still go with what i know; which is the pull rod having 3 benefits.

Whether Ferrari's new solution compensates we will see.
Maybe Ferraris is better in a comparison and everyone copies Ferrari in 2012?
All that matters is which one is advantageous for the given regulations. As it stands a few races are needed to prove that.
But going by trends of 2009 and 2010, redbull weren't complaining.

So myurr, now that you are fully convinced, which one would you chose, and tell me the disadvantage of the pull rod in ferrari's case? :wink:
For the F150 I would choose the push rod suspension as it's clearly the layout that works best with that car.

But the real point you keep so obviously missing is that I wouldn't choose one or the other up front. I would work on the overall concept and then see which suspension layout fits best without causing compromises elsewhere. Neither is the right or wrong solution, they both have their merits, and neither is going to make or break a championship challenge.

All else being equal then the pull rod holds a minor C of G benefit. But as everyone keeps trying to point out to you, and Ferrari are demonstrating, each causes compromises and those compromises can easily outweigh that small C of G benefit.

Edit: The disadvantage in Ferrari's case is going to be either packaging (they didn't have room for the components low down) and / or aero (they wanted a taller narrower solution rather than a shorter but wider one, allowing for a tighter rear in their design).

User avatar
PlatinumZealot
559
Joined: 12 Jun 2008, 03:45

Re: The relative benefits of a pull rod suspension in 2011

Post

I was the one that said it is a no-brainer in terms of the performance advantage.

I think Ferrari had

1) Time
2) Money
3) Rework

against them.

They want to stick to what they know basically.

They have cleared up the top of the gearbox to some extent by moving the working parts forward. The steeper push-rod angle will require stronger parts of course.

The car still hasn't run yet and there are more cars to come out so everybody hold yer horses.
🖐️✌️☝️👀👌✍️🐎🏆🙏

Racing Green in 2028

myurr
myurr
9
Joined: 20 Mar 2008, 21:58

Re: The relative benefits of a pull rod suspension in 2011

Post

n smikle wrote:I was the one that said it is a no-brainer in terms of the performance advantage.
Actually you were both at it. E.g.
ringo wrote:If the winning car has it, copy it with no second thoughts. Don't think about it just copy it, you wont regret it.
But to say that Ferrari didn't adopt it because of time, money, or because they want to stick with what they know is rubbish. Ferrari stated they looked at the solution last year, they were said to have looked at it again this year, Ringo even claimed they were definitely running it this year. Ferrari has more than enough resources to make the switch over a two year period if there it is the optimum solution for them.

Don't forget that the pull rod was actually invented first and the push rod followed as a packaging solution. It is most likely for packaging and aero reasons that they have stuck with the push rod solution.

User avatar
ringo
230
Joined: 29 Mar 2009, 10:57

Re: The relative benefits of a pull rod suspension in 2011

Post

myurr wrote:
WTF!? I've been saying the same thing to you consistently and constantly. You said wait until the cars are launched, now you're saying wait until the first race.

You're the one saying that pull rod was a no brainer and that teams shouldn't ask questions they should just use it, no ifs or buts, as it has no downsides. You're the one that said that Ferrari were going to run a push rod setup. You're the one with egg all over your face now trying to backtrack.
Yep i'd still make the jump. Why not? If it works well it works well.
They have testing facilities for a reason. Each team knows what they are getting into when they commit to something.


Blindly choosing the pullrod is not really risky. Remember it's not like baking a cake, where you never know what the result is until you taste it. Testing is being carried out along the way, so it's unlikely that a team would choose a path that works against what they want to achieve.

For instance let's say renault wants the the pull rod setup. They would carry out tests to make sure that the car is well integrated with the KERS and single diffusor before the car touches the track.
Where's the risk? We all saw what rebull did in 2009 and 2010.
Nicely packaged and still narrower than the F150 in the rear.
KERS is the major question.
Copying is not going to guarantee wins, but it puts you in a proven and tested position.
For the F150 I would choose the push rod suspension as it's clearly the layout that works best with that car.
It's easy to say that now. :lol:
But the real point you keep so obviously missing is that I wouldn't choose one or the other up front. I would work on the overall concept and then see which suspension layout fits best without causing compromises elsewhere. Neither is the right or wrong solution, they both have their merits, and neither is going to make or break a championship challenge.
You chose one up front. but you don't commit to it until it's satisfactory. You probably have 2 alternate designs that you compare to your main choice, and you see if it's worth pursuing. However having proof of concept from Redbull's 2 successful years is worth noting. This is what i mean by blindly adopting a working solution. Especially for a smaller team like lotus.
All else being equal then the pull rod holds a minor C of G benefit. But as everyone keeps trying to point out to you, and Ferrari are demonstrating, each causes compromises and those compromises can easily outweigh that small C of G benefit.
You don't know what ferrari are doing as yet. So hold that thought. It may well be totally different to what anyone has seen.

I am actually glad that they still don't have a conventional setup because it proves that they were aware of the disadvantages of the previous design. Theirs is nothing what anyone here honestly expected.
Edit: The disadvantage in Ferrari's case is going to be either packaging (they didn't have room for the components low down) and / or aero (they wanted a taller narrower solution rather than a shorter but wider one, allowing for a tighter rear in their design).
I don't think the width of the pull rod setup affects how narrow the gearbox is. Most of the parts are actually in front of the narrow part.

I have a feeling KERS and the romoval of the DDD has to do with ferrari's choice, and maybe reliability.
Not saying that one suspension is less reliable, but changing from one to the other may have transitional problems.
Ferrari are simply sticking to what they know.
I'll wait and see.
For Sure!!

User avatar
PlatinumZealot
559
Joined: 12 Jun 2008, 03:45

Re: The relative benefits of a pull rod suspension in 2011

Post

The Red Bull had the best packaging last year partly due to the pull rod.
And right now ferrari is actually compromising the angularity of their push-rod to improve packaging. I think every one agrees on this?

Again lets hold our horses; the championship has not even begun. The funny thing with this discussion is that even at the end of the season we will have no real way to prove which one was the one to have.
🖐️✌️☝️👀👌✍️🐎🏆🙏

Racing Green in 2028

bettonracing
bettonracing
1
Joined: 12 Oct 2007, 15:57

Re: The relative benefits of a pull rod suspension in 2011

Post


User avatar
ringo
230
Joined: 29 Mar 2009, 10:57

Re: The relative benefits of a pull rod suspension in 2011

Post

edit,
Ferrari's 2011 challenger has stuck with the more traditional push-rod layout - which can have some advantages in terms of component placement and produces different performance characteristics.

The team's chief designer Nikolas Tombazis reckons that Ferrari has been able to keep all the benefits of the push-rod layout without suffering any drawbacks in terms of the aerodynamic layout at the rear of the car.

"We evaluated different suspension configurations, and also pull-rod suspension like the one Red Bull introduced," he explained at the launch of the new Ferrari F150 on Friday.

"There are different possibilities - one is for aero volumes and we have found a way, which is not so visible on the car right now, to reduce the volume of the push rod suspension in an extreme way.

"That means we could reduce the rear volume, so our version is far more compact compared to the previous ones. We believe we have reached a similar level of packaging to the other ones."
Nice, this is what should be discussed.
For Sure!!

myurr
myurr
9
Joined: 20 Mar 2008, 21:58

Re: The relative benefits of a pull rod suspension in 2011

Post

But it just says what we've all been saying to you and you haven't been listening!

User avatar
ringo
230
Joined: 29 Mar 2009, 10:57

Re: The relative benefits of a pull rod suspension in 2011

Post

No no no. Don't even try that. :wink:

This is something completely different. Just be honest about it.

You can't be telling me about something all along when it never existed. Worse yet, there was nothing to listen to because i was asking for the pros and cons in bullet points, no responses.

You were tight lipped on the preexisting designs that have been in use for years. You can't just jump on a bandwagon of something completely different. Worse yet, you are prematurely celebrating.
We don't know how this thing works.

It may well have drop links going into the bell housing. With the parts on top or beside the clutch instead of bellow.

But let's not get carried away, there are 11 more teams.
Suppose Mclaren come out with a torsion bar rocker arm suspension?
For Sure!!

myurr
myurr
9
Joined: 20 Mar 2008, 21:58

Re: The relative benefits of a pull rod suspension in 2011

Post

ringo wrote:No no no. Don't even try that. :wink:

This is something completely different. Just be honest about it.

You can't be telling me about something all along when it never existed. Worse yet, there was nothing to listen to because i was asking for the pros and cons in bullet points, no responses.

The only change in my position at all was that reading scarbs post and seeing his diagrams showed me that the pushrod didn't hold the definitive aero advantage that some were claiming.

You were tight lipped on the preexisting designs that have been in use for years. You can't just jump on a bandwagon of something completely different. Worse yet, you are prematurely celebrating.
We don't know how this thing works.

It may well have drop links going into the bell housing. With the parts on top or beside the clutch instead of bellow.

But let's not get carried away, there are 11 more teams.
Suppose Mclaren come out with a torsion bar rocker arm suspension?
Seriously dude, go back and read the thread. I posted several times pointing out the packaging differences, and we pointed out scarbs blog post about it all that went into the pro's and con's in detail and you ignored that as well.

It's really rich for you trying to tell me to 'not try that' and of jumping on bandwagons, when it's you that's trying to change your tune from saying people would be stupid to not just copy Red Bull's setup to trying to discussing the new merits of Ferrari's design.

Numerous people in this thread have been consistently saying that the pull rod has packaging disadvantages, that you wouldn't even contemplate when faced with the wondrous (and mythical) aero advantages, and that there was no clear cut advantage to either. Why is it so difficult for you to admit you're wrong instead of trying to twist peoples words and rewrite history?

User avatar
ringo
230
Joined: 29 Mar 2009, 10:57

Re: The relative benefits of a pull rod suspension in 2011

Post

Let me show you how easily swayed you are. Read carefully:
The team's chief designer Nikolas Tombazis reckons that Ferrari has been able to keep all the benefits of the push-rod layout without suffering any drawbacks in terms of the aerodynamic layout at the rear of the car.
This is suggesting aero drawbacks of pre existing pushrods, which was the discussion. There is no suggestion that pull rod has packaging disadvantages. I don't know how you came to that. Ferrari preferred the traditional method and made accommodations to mimic the pros of pull rod.

And you are still not bold enough to be specific in what you are saying. You'll just wait for another article to gobble up, regurgitate and say you knew all the time.

You simply can't use Ferrari's innovation as the poster boy of the discussion. Tobazis has found a way indicating this was never done before. So it's disingenuous to put any claims on it as your typical case.

Let me just stay cool like felipe and watch the season unfold. 8) So many things can happen from now.
For Sure!!

myurr
myurr
9
Joined: 20 Mar 2008, 21:58

Re: The relative benefits of a pull rod suspension in 2011

Post

I don't know if you actually believe what you write but it's getting more and more ridiculous.

How can I say there are packaging disadvantages to pull rod - the simple fact that Ferrari went to all the trouble of redesigning their push rod system in order to keep it's advantages. If there were no disadvantages to the pull rod layout then why go to all that trouble instead of just switching?

Or maybe you think Ferrari are too stupid to be able to implement a pull rod design and had to resort to modifying the push rod system instead...

marcush.
marcush.
159
Joined: 09 Mar 2004, 16:55

Re: The relative benefits of a pull rod suspension in 2011

Post

seriously ,at the back of the car ,placing the inerter on top of it or maybe 100mm lower will not have a serious impact on CoG height.
Wasn´t the main benefit to do away with the big rocker arms leading to that ugly hump all pushrod cars feature on top of their transmission? Not long ago Ferrari
used Sachs rotary dampers not for their performance or adjustability but solely for packaging AERO reasons.Now again they have gone for a extreme solution to reduce packaging volume for the top mount suspension .
But looking at those pullrod angles on neweys RB6 that cannot be a clean path for the forces involved..but who knows if the bump stear induced by this layout has not a benefit we have not even thought of...