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Dr Obbs Profile picture
@dr_obbs
Mar 31, 2022 • 16 tweets • 11 min read • Read on X
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@DANIELEALOFAN Made a great overlay of what the #LasVegasGP track layout could be like in 2023, so I decided to use this as a go-by and add some turn numbers. Let's take a Google Maps tour of the circuit! #F1
The starting line and T1-T3 section looks to be in a currently vacant field where tarmac will surely be laid down. This could change, but interesting nonetheless and has lots of potential. #LasVegasGP
The Turn 4 exit takes us to Koval Lane which is around 1km in length from T4 to T5. Our first potential DRS Zone #LasVegasGP
The turn 5 entry could be at the intersection of Koval and Westchester drive. Would be a hard braking zone into a hard right turn before a sweeping turn 6. #LasVegasGP
Sweeping left handed turn 6 will be a true spectacle around the MSG Sphere which is able to project custom images on the outer surface. Currently under construction this will be a sight to see! #LasVegasGP
Turn 7 will be a slight uphill right hander along Sand Avenue. Nice and wide with lots of room for passing and to carry speed into the T7-T8 switch backs. #LasVegasGP
Turn 8 will be another high speed section moving left before coming to Las Vegas Blvd. #LasVegasGP
Turn 9 to Las Vegas Blvd. would likely be a hard braking zone into the massively long straight. Surely a location to go full send into the corner! #LasVegasGP
Surely the highlight of the entire GP will be the high speed run down the Las Vegas Strip. There is a slight left hand around the Mirage Casino, but what a sight it will be! #AMuS reports the cars could reach over 340 kph! #LasVegasGP
The T11, T12, & T13 will be very interesting. The current intersection is large enough for a chicane. This would make for a spicy battle after such a long straight through this low speed section. #LasVegasGP
The T13 to T14 straight is roughly 1km long and another potential DRS zone. More than likely the pit entry will be somewhere around here. #LasVegasGP
Speaking of pit lane, there are a couple options. The first is halfway down the straight at Audrie street where a large parking lot is. Would make for a simple entry to a big pit area #LasVegasGP
Another option is slightly further down where another large tarmac exists. This might be a more difficult pit entry location. #LasVegasGP
Our final turn is at T14 where there currently is a fence blocking the large field behind it. #LasVegasGP
The #LasVegasGP will be quite the race, which will attract lots of celebrities from nearby Los Angeles. The track looks to have some potential as well! I hope you enjoyed this tour around Vegas! @F1
I'm curious to know if there are any other thoughts from others!
@JennieGow @wbuxtonofficial @karunchandhok @NaturalParadigm @MattyWTF1 @chainbear @EngineMode11 @EstagiariodaF1 @AlbertFabrega

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More from @dr_obbs

Dr Obbs Profile picture
May 28
Lots of talk about tyre degradation, tyre temps, balance, and the like. So I think it's time for a refresher course on tyres, grip, and degradation. I'll try and cover all of this in this thread, but stay at a high level (because it's incredibly complex) for general understanding.

Firstly, we should understand that as a car goes around a corner, the input angle of the driver to move the tyre relative to the direction of travel creates a slip angle. This slip angle creates the forces at the contact patch that act to rotate the car about the Center of Gravity (CoG) through the corner (moment).Image
If we focus in on a single tyre, then we see that with increasing slip angle (with constant Normal Force), the lateral force to turn the car is increasing until a limit (sliding limit). After this point, increasing slip angle will result in less lateral force, as the tyre is no longer able to impart a force at the contact patch without sliding.

The rubber tyre behavior plays a key role in this as well. In the initial stressed region, the rubber acts as a linear elastic material with increasing slip angle (Figure in the middle). At a point, this transitions to an intermediate phase where the rubber acts non-linearly. This non-linear stress response generates a hysteresis within the material that manifests itself in a heating response. This is termed hysteretic heating, and can be a key to generating bulk tyre temperatures.Image
The grip at the contact patch is greater as the load at the patch is increased. This means that the lateral force that can be generated from the same tyre is greatly increased with increasing normal force. This is why downforce for race cars matters so much. As you increase the load, the turning force that can be applied is increased, as well as the load limit for sliding at increasing slip angle. The coefficient of friction between the track surface and the rubber plays a key element in this as well. With different track types, the surface has more or less grip potential. Essentially more or less coefficient of friction.

Ref. image (suspensionsecrets.co.uk/tyre-slip-angl…)Image
Read 8 tweets
Dr Obbs Profile picture
Mar 13, 2024
People often ask me, "where can I find great information on motorsports and aerodynamics?" So how about a thread of some of my favorites? And no, I don't get paid to endorse these. I just think F1 Tech is a great place to share knowledge! Also, this is NOT an exhaustive list, but some that stick out to me. Feel free to add yours as well below!

Video below by Vyssion and JJN.
Let's start with some of my favorite books on car aerodynamics! "Race Car Aerodynamics: Designing for Speed" by Joseph Katz is goated. A really great book covering all types of race cars and written for anyone at any level. I highly recommend this book. Image
Another book that is sort of an extension of Katz is one from Simon McBeath called "Competition Car Aerodynamics." It's like a newer version of Katz book, and with a bit of very simple CFD in it as well. Image
Read 17 tweets
Dr Obbs Profile picture
Mar 4, 2024
Is the RB20 great? Or is Max Verstappen + the RB20 great? I spent some of the weekend looking through the telemetry. And here is what I have found. In summary, Max Verstappen is a Swiss f*cking watch. Well, maybe a Dutch watch. Let's look at it in this thread. Image
Looking at the macro view level lap times to gage consistency, you can see that it's incredibly consistent irrespective of compoud. Credit to Checo as well, his lap times in Bahrain were also very consistent, but also consistently 5-tenths to 1 second slower per lap. But why? Image
Looking over the a single lap, many show similar characteristics. It's like death by a thousand paper cuts, or in this case by 15 corners. The intricacy and precision of driving from one corner to the next builds delta from corner to corner. Image
Read 13 tweets
Dr Obbs Profile picture
Jul 12, 2023
Was the RB19 of MV really slow on the straights compared to the other teams? Or was something else going on? We know that MV wasn't fortunate to gain any DRS or slipstream after passing LN, but what else was going on? Let's understand this more in the thread below. 🧵
If we look first at the pit straight into Turns 1 and 2, comparing LN and MV, we see something peculiar. MV never upshifts to 8th gear, but holds 7th. Thus, his engine RPM is higher and he doesn't lift into T1. He does, however, lose time slightly to LN due to the lower speed. 🧵
Looking at the onboards, LN is 1.336s behind MV so he may catch a very slight tow, but the top speed delta here is 4kph with LN reaching 300kph. By MV never upshifting to 8th gear he limits his T1 entry speed, but doesn't have to lift as a result. 🧵
Read 11 tweets
Dr Obbs Profile picture
May 31, 2023
Well that helps to solve that mystery. Had also heard that this plank was painted so they could observe the wear patterns better. Looking at this, the plank wear is quite low overall. How about a thread comparing my observations of the RB, Merc, and Ferrari wear patterns.🧵
The bib looks to be running quite low. Possibly some forward rake, as most suspect. RB is able to run their forward floor very low, and still ride curbs and manage bump tracks like Monaco. A bit more left sided mid wear. 🧵 Image
Mid floor looks pretty stable with little wear. Same preferential left side wear from previous image along the length of the mid floor. No floor flexing going on here. 😉 🧵 Image
Read 7 tweets
Dr Obbs Profile picture
May 30, 2023
There is a quote in here that perfectly summarizes what I have been trying to say about the complexity seeing an image of a floor, and then getting a floor to work well.

"Talking to an engineer from the Milton Keynes team, not too worried about the photographs taken of their.."
"..underbody in Montecarlo, he explained to us that it is easier to work on the cross section of the channels while the slope (height) variation part inside is much more complicated to the tunnel and the simultaneous generation of eddies; an infinite job, among other things.."
".., since a car never works with a constant height but has many external elements, such as bumps, and dynamics, such as roll, pitch, etc., which greatly complicate the design of what it is the most important aerodynamic component of these new F1 cars..."
Read 4 tweets

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