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Dr Obbs Profile picture
@dr_obbs
May 7 • 4 tweets • 2 min read Twitter logo Read on Twitter
Thoughts on the race & grid for the #MiamiGP

-Rubbered in racing line side (P1 & behind) should be grippier than the other
-Alonso had the inside of T1 if he can launch well
-Perez should be ahead after short run to T1, but launch will be everything.. (cont) Image
-KMag at P4, a bit high, but has some real pace this weekend
-Gasley could pip KMag early, and develop a bit of a train behind him
-Russel on the slippery side needs to watch out for Leclerc who is faster.
-Both CL and MV need good starts. Could jump a place each right off… Image
-Drivers complained of the grip off the racing line. Passing most probable between T10-11, and T16-17.
-Tyre degradation looks better? Multiple runs on soft could mean the surface is deg friendly. 1 stop prob
-Alonso is a master at keeping position. Will be a menace. 😈… Image
-if it rains before the race, the track will be green again. Track evolution will be huge
-rain during the race changes everything. Could be chaos, and will be harder to recover for MV and CL
-Chances of rain have diminished, but looks windy
-should be a great race!! Image

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More from @dr_obbs

Dr Obbs Profile picture
May 8
There is this narrative going around that Checo wasn't informed enough of what Verstappen was doing, so let's dive into it and see what's what. Lap 21 Checo Pits for Hard Tyres. HB tells him on exit MV's last time on hard tyres "32.2." Lap 22 a few minor setting changes 🧵
Lap 22 SP 1.31.5, MV1.32.27. Checo asks HB on lap 23, what is MV's last lap?" HB tells him "Max was a 32.2." Lap 24 HB comes on the radio and tells SP "Max a 31.9." Checo did a 31.86 on lap 23. 🧵 Image
Lap 24 HB asks about balance on the hard. Lap 25 HB tells Checo "Max that time a 32.1, gap 17 seconds." SP does a 31.4 on lap 24. Lap 26 HB tells SP "31.9 for Max, gap 16.6." SP did a 31.4 on lap 25. 🧵 Image
Read 9 tweets
Dr Obbs Profile picture
Apr 27
My thoughts on this,

@KyleEngineers was the first I saw to mention that this decoupled underbite scoop could be “tuned” for specific conditions in the future, and I think that’s exactly what RB have done here. Cont..
The leading edge has been raised to potentially allow you to pressurize the undercut more for better mid wake control.

With the underbite, a raised LE doesn’t necessarily mean sacrificing cooling either, as you still have upper intake pulled back to pull in mass flow. Cont..
With better mid wake control from the higher LE, it’s possible the change to the outboard edge may be to soften the curl and reduce outwash that is no longer needed. Possibly some small gains that could help reduce overall drag in this region.
Read 4 tweets
Dr Obbs Profile picture
Apr 27
Good shot of the @ScuderiaFerrari double mouse hole. @KyleEngineers did a good video on how this might work to cast smaller discrete vorticity into the diffuser edge to help clean up the edge flow. Tom Talks also did a good video on this. I will link both below ⬇️ Image
Here is the reference for the video from @KyleEngineers explaining this. Typically, smaller more discrete vortices are less prone to burst when they experience an adverse pressure gradient having their axial velocity reduced.

The video from talk talks linked here showing how the mouse hole helps to manage any vortex burst in the diffuser that would reduce your effective volume for expansion.

Image
Read 5 tweets
Dr Obbs Profile picture
Feb 22
Just going to say this..

You can NOT seal a ground effect floor with vortices. Without sliding skirts, you WILL get inflow.

So there is no such thing as floor sealing vortices. There are, however, ways to use this inflow to your advantage.
Rear floor edge structures are created to bring some inflow vorticity into the rear floor to help stabilize and clean up the diffuser. So what can these pronounced forward edge structures do?

CFD from Latios (F1Technical)
In this study by JJN and Vyssion, these edge structures can be seen to help bring some edge load (suction) where it may not be otherwise. The core of a vortex is low pressure, so these edge vortices help with overall floor downforce.
Read 6 tweets
Dr Obbs Profile picture
Feb 20
It's very interesting when you look at a teams carbon footprint, however. @McLarenF1 produced a FANTASTIC sustainability report in 2022 highlighting some of their top carbon emitters. It was not logistics or travel. For them it was scope 3 emissions from development and mfg. Image
Scope 3 emissions are indirect emissions from suppliers for purchased goods, and fuel and energy related activities. For McLaren this number includes all of their racing series.

media-cdn.mclaren.com/media/sustaina…
I think it would be incredibly interesting to sit down with @ZBrownCEO and @McLarenF1 as part of the @TechHeadsF1 Pod to really understand what teams are doing for sustainability. What actions are teams taking to reduce their carbon footprint, and what should F1 do?
Read 4 tweets
Dr Obbs Profile picture
Oct 11, 2022
Let's talk about F1 front tyre wake!!

For open wheel race cars, the wake from the front tyre is a very important thing to understand. It can impact many of the aerodynamic elements downstream. The complex structures around the tyre are 3D, and very complex #F1Tech 🧵 https://www.racecar-enginee...
There are many research papers and articles studying this very phenomena. What you should know is that the wake is not stagnant but influenced by many factors like tyre rotation speed, wheel covers/no covers, tyre deflectors, etc.. #F1Tech 🧵 "Race Car Aerodynamics...
Previously the F1 wheels were exposed to the flow, but with the updated technical regulations using wheel covers, the aim was to reduce the dirty air from this interaction. The aim of the wheel covers was to clean up the width of the wheel wake. #F1Tech 🧵 "Typical vortical stru...
Read 11 tweets

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