Craig Scarborough Profile picture
Jan 25, 2023 13 tweets 6 min read Read on X
#F1 suspension has evolved massively over the years. Especially how the spring/dampers are mechanically operated.
From the Sixties till Today, I’ve drawn up a normalised & simplified set up to show the major variations over the years.
/long thread...
#F1 #techTalk
1-Outboard
We start with the outboard mounted spring/damper. This worked as it's simple, plus the spring/damper travel was close to wheel travel.
Back in the day, the chassis was much wider than now, so short spring/dampers could fit in the narrow gap.
#F1 #TechTalk
2-Rocker Arm
The rocker arm set up became commonplace in the 70s & 80s. Creating a narrower monocoque and putting the spring/damper out of the airflow for the front wing & ground effects. The spring/damper travel was limited and the set up was bulky & heavy
3-PullRod
Introduced to F1 by Gordon Murray at Brabham, (arguably ACBC Lotus 72)
A rod pulled a rocker in bump to operate the vertically mounted spring/damper.
This was much more streamlined & lighter, plus the rocker geometry allow rising rate to help with increasing aero loads
4-Pushrod Vertical
Coming in 1983 the push rod variation of pull rod was introduced by Brabham and McLaren. Effectively an inverted pull rod set up with a different rocker geometry. This reduced the loads in the wishbones & has remained the most common front geometry since
From now on the variations are all shown as pushrod, but would equally work with pull rod as well.
Also, I am just showing the front end layout, fashions for the rear suspension are largely the same, but have tended to vary more between push and pull operation.
5- Pushrod Horizontal
As the cars slimmed down, the spring/dampers clashed with space for the driver/gearbox.
So the set up was flipped to place the spring/dampers over the top.
This was similar in terms of rocker geometry. Better for mechanics access, but worse for CofG height.
6-Monoshock
At the turn of 80s to 90s, some teams opted for a simpler/lighter set up, this decoupled heave and roll control.
With no side spring/dampers, one heave (mono) spring/damper and belleville springs on the slide/pivot for roll stiffness. There was no roll damping.
7-Active
Then active suspension became a workable solution.
Not having the need for spring/dampers/rockers, The set up could be simplified to just an actuator on the end of the pushrod. Although there was a lot of hardware placed elsewhere in the car
This was banned from 1994.
8-Torsion bars & 3rd element
Torsion bars are splined between the rocker and chassis and twist to resist movement.
They are much smaller, reduce the bending moment coil springs place on the damper and also spring & damper could be replaced separately
8-Torsion bars & 3rd element
Then to have heave control separate to roll, a 3rd element was added
Operated by a rocker, it only worked when both wheels are going up & down at the same time
The 3rd (heave) element went from being a bump stop, to a damper and latterly spring/damper
9-Pushrod Vertical
Safety rules prevented the torsion bars encroaching into the footwell, This made the horizontal mounting impossible, so teams reverted to a vertical set up, placed ahead of the drivers feet.
Functionally there was little difference to the previous set up.
10-Pushrod with heave and roll damper
We are now up to date.
As teams are able to streamline the use of heave, roll & side elements.
Now, there are commonly only heave and roll spring/dampers in the set up, decoupled from each other & often without side springs/dampers.

• • •

Missing some Tweet in this thread? You can try to force a refresh
 

Keep Current with Craig Scarborough

Craig Scarborough Profile picture

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!

PDF

Twitter may remove this content at anytime! Save it as PDF for later use!

Try unrolling a thread yourself!

how to unroll video
  1. Follow @ThreadReaderApp to mention us!

  2. From a Twitter thread mention us with a keyword "unroll"
@threadreaderapp unroll

Practice here first or read more on our help page!

More from @ScarbsTech

Mar 25
Some analysis into the #MV33 brake failure & fire at the #AustralianGP.
RBR said the right rear caliper was stuck on, which would have been detectable by pressure sensors.
So, it wasn't a blocked brake duct (my initial guess).
thread....
#F1 #F1Tech
📸 F1TV
Image
Image
The heat from the brake being constantly on, set the brake duct on fire.
However, the brake disc did not explode when entering the pits. As the disc was still visible & intact in the pits.
The blast was probably the wheel/tyre failing releasing the air & blowing debris everywhere
Image
Image
So, where does the brake system split to isolate the RR caliper and what parts might be responsible?
The brake system is split front and rear.
The front shares the same pedal and tandem master cylinder with the rear, so we can exclude those parts. Image
Read 7 tweets
Nov 29, 2023
It's been exactly 3 years since Romain Grosjean's huge accident in Bahrain.
The monocoque was on at the @F1Exhibition in Madrid this summer.
I took some time to look over the tub and noted the damage, which included elements I wasnt aware of...
#F1 #F1Tech
Thread....


Image
Image
Image
Image
Summarising the crash
The car went intact into the barriers at 197kph, at an angle on it's right hand side. This was the biggest deceleration, 67g.
The car jammed in the barrier and flicked around to the left, breaking apart in doing so, the survival cell remaining in the barrier Image
2)With the initial frontal hit to the barriers, the nose box wasnt evident on the car or track in the post crash pics.
But some of the nose is still attached to the right, but little remains on the left.
Most of the length of the nose appears to be used in absorbing the impact.

Image
Image
Image
Read 11 tweets
Jun 17, 2023
Williams are another team bringing a big update to their car.
The FW45 has had a thorough aero review, with one set of bodywork readied for #AA22 at the #CanadianGP.
#F1 #F1Tech ImageImage
The floor is the key change. Mostly the underside, but the inlet fences, floor edge and diffuser are more visible changes. The rear brake ducts are reworked accordingly.
#F1 #F1Tech ImageImage
Also the sidepods, feature new inlets and a deeper scallop to the waterslide. Directing more flow to the diffuser.
#F1 #F1Tech ImageImageImageImage
Read 6 tweets
Jun 17, 2023
The first big update to the AMR23.
Heavily revised sidepods, floor edge and cooling outlets.
#F1 #F1Tech #CanadaGP ImageImageImageImage
The waterslide is narrowed and starts with a distinct edge. This may be to contain the rotating airflow, which marries up with the revised undercut, to create more load over the diffuser.
#F1 #F1Tech #CanadaGP ImageImage
The undercut feeds into the floor edge further back and with more more load.
The floor edge has been revised, but not in a substantially different way.
The rear tyre temperature sensor is embedded in the floor (red)
#F1 #F1Tech #CanadaGP Image
Read 5 tweets
Apr 1, 2023
Corner entry deceleration issues for RBR persist.
#F1 cars 'brake' in several ways. There's the hydraulic brakes, hybrid braking and engine braking. All affect how the car slows & rotates into a turn. From inputs at the pedals, calculated by the ECU.
#F1Tech #AustralianGP
Simply lifting off the throttle gives engine braking. This map can be varied from the steering wheel button (EB or Torque). Altering the throttle/fuelling at that moment.
More EB (up to a point) gives stability/understeer. Less EB gives more rotation.
Confusing things more are the differential settings, that gave a similar balancing effect on corner entry.
Read 5 tweets
Apr 1, 2023
Speaking to guests after #AustralianGP Quali, Lawrence Stroll revealed part of the reason for AMR's pace & why LS was a little slower than FA, but much closer today
The bulged sidepods are driven by exhaust vibrations to ease boundary later build up over and the car
#F1 #f1tech
Boundary layer is a phenomena where there's a layer of air stuck to the car. Over long surfaces it builds up & upsets the aero.
AMR tech director Dan Fallows discovered at Red Bull, during the exhaust blown diffuser era, that vibrating the bodywork reduces this. As used on planes
So, the large sidepod flanks are built internally, to be vibrated by the exhausts, not using the exhast gasses, just their movement
The large flanks to the sidepods each house a large internal volume called the 'Resonant Tank'. This shakes the waterslide tunnel and the underfloor
Read 5 tweets

Did Thread Reader help you today?

Support us! We are indie developers!


This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3/month or $30/year) and get exclusive features!

Become Premium

Don't want to be a Premium member but still want to support us?

Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal

Or Donate anonymously using crypto!

Ethereum

0xfe58350B80634f60Fa6Dc149a72b4DFbc17D341E copy

Bitcoin

3ATGMxNzCUFzxpMCHL5sWSt4DVtS8UqXpi copy

Thank you for your support!

Follow Us!

:(