[KVRC] Khamsin Virtual Racecar Challenge 2016

Post here information about your own engineering projects, including but not limited to building your own car or designing a virtual car through CAD.
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machin
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Joined: 25 Nov 2008, 14:45

Re: Khamsin Virtual Racecar Challenge 2016

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RicME85 wrote: I have also updated a blog I started ready for the new season and have a Twitter account and Facebook Page, the details have been supplied in the registration, hopefully will help with promoting the product.
Cool. I'm part way through putting some of that information into an "introduction to racecar aerodynamics" document for anyone new joining. Hopefully will be available at the weekend.
COMPETITION CAR ENGINEERING -Home of VIRTUAL STOPWATCH

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machin
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Joined: 25 Nov 2008, 14:45

Re: Khamsin Virtual Racecar Challenge 2016

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LVDH wrote:It seems that the new cars are starting to get developed.
Where will the season start this year? A high, medium or low downforce track?
The plan is to do the same as last year... high downforce to start with and then onto medium downforce tracks..
COMPETITION CAR ENGINEERING -Home of VIRTUAL STOPWATCH

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CAEdevice
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Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: Khamsin Virtual Racecar Challenge 2016

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The official website reports this traks:

Pre-season race: Nurburgring, March
Race #1: Nurburgring, April
Race #2: Monaco, May
Race #3: Silverstone, July
Race #4: Sepang, September
Race #5: Sao Paulo, October

It's ok for me, but I would suggest to evaluate a different point attribution (here is an expample):

Pre-season race: Nurburgring, March >>> 1pt to the winner, zero points to all the other patecipants, no resubmitting option (penalties)
Race #1: Nurburgring, April >>> usual points
Race #2: Monaco, May >>> usual points
Race #3: Silverstone, July >>> usual points
Race #4: Sepang, September >>> usual points
Race #5: Sao Paulo, October >>> usual points x2

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RicME85
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Joined: 09 Feb 2012, 13:11
Location: Derby

Re: Khamsin Virtual Racecar Challenge 2016

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I assume the double points idea is to keep entries high to the end? If so, why not have a steady increase of points each round?

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LVDH
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Joined: 31 Mar 2015, 14:23

Re: Khamsin Virtual Racecar Challenge 2016

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I like the preseason race idea.

But every other race should be awarded with the same amount of points.

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CAEdevice
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Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: Khamsin Virtual Racecar Challenge 2016

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Double points would help teams with small resources, consider that a team with big computational resources has a more steep development curve.

Also consider that, without driving skills differences and without random events and strategies, the car that wins the last race is probably the best one ;)

I agree about the pre season race.

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CAEdevice
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Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: Khamsin Virtual Racecar Challenge 2016

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It seems that a couple of CAEdevice MP003D (hybrid 2015-2016 car) is on the track now (Vallelunga circuit, 3D environment by Assetto Corsa).

Image

VIDEO: https://dl.dropboxusercontent.com/u/522 ... 016_01.mp4

(upolading now, ready in 10 minutes)

PS: Waiting for the new rules and OCCFD before starting the 2016 car project, I'm testing the physics of the 2015 car (with 2016 nose and not definitive livery) with Assetto Corsa driving simulator.

JJR
JJR
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Joined: 12 Jul 2013, 20:02

Re: Khamsin Virtual Racecar Challenge 2016

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Nice vide Matteo.
That 1st corner after s/f straight is super fast.
How does it feel to drive your own car ? :D
You have mentioned that Eau Rouge is flat with your car. What time did you achieved? Under 2 minutes wold be great.

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CAEdevice
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Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: Khamsin Virtual Racecar Challenge 2016

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JJR wrote:Nice vide Matteo.
That 1st corner after s/f straight is super fast.
How does it feel to drive your own car ? :D
You have mentioned that Eau Rouge is flat with your car. What time did you achieved? Under 2 minutes wold be great.
Yes the KVRC cars (I used my cars parameters, but the same is for your car, Variant's car and Mantium's that have even better FD values) are very very fast in corners, especially fast corners.

I tested the car at Vallelunga, Vallelunga Club (very slow track, non much faster than Monaco) and SPA. Consider that I am a very modest driver and that the physics of AssettoCorsa are very realisitc, not far from driving simulators used in motorsport: the result was a laptime of 2'04" at SPA. When I asked a "real" simracing driver to test the car, he obtained 1'57-1'58" with medium tyres and 30 liters of fuel.

The car at SPA uses the "efficiency" setup (the one we used during the last three races) and the Eau Rouge cornering speed is around 280km/h. It is almost flat except for a small torque reduction that comes automatically from the kers partially controlled by multiple factors (90% gas position, 10% steering-angle/selected-gear/tyres-slippping).

The "extreme downforce setup" requires driving capabilities superior to my (low) driving perfomance: I consider it "not human" (tha is why I asked for a lower diffuser). The same if I exclude electronic help that controls the kers (but I think that is almost realisic and that real LMP1 also have such controlled kers).

I have to thank a user (AkkAkut) of the official AssettoCorsa forum for working on the 3D import of the car. I personally developed the suspensions and the whole physics: it was a bigger job than I could think, more than 50h to write all the parameters. Machin helped very much providing data about engine/kers/differential, while the sospensions have been designed from zero, keeping the same schema of Chris template, but with differents angles and rotation poins.

The project is open but not completed yet, I'm going to publish the link to the final release on this forum so that everyone can try a KVRC car (AC is needed or a conversion to other driving simulators as R-Factor).

Last consideration; the car uses the same paramters provided by Machin and I was impressed by the correspondence of the results of AC and VisrtualStopWatch: they both simulate the car performance precisely.

The only difference between the KVRC cars is the rear tryes width. With the original one it was almost impossible to couple the initial pressure (cold tyre) and the pressure after two or three laps (the temperature was too high, I think as a consequence of the impressive downforce). The rear tyres used in the AC model are 50mm wider than the original ones.

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RicME85
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Joined: 09 Feb 2012, 13:11
Location: Derby

Re: Khamsin Virtual Racecar Challenge 2016

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Would look great to have an end of season race with each of the competitors cars. Far too much work though.

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CAEdevice
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Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: Khamsin Virtual Racecar Challenge 2016

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RicME85 wrote:Would look great to have an end of season race with each of the competitors cars. Far too much work though.
The physics would be easy to adapt (only the aero parameters change) using the template I wrote.
The real problem would be the 3D geometry: STL files are not suitable, mechanical CAD files (es. SWX, NX, ...) are a bit better, but only Blender/3ds max would work perfectly (and even in that case, about 2-3h per car would be needed).

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RicME85
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Joined: 09 Feb 2012, 13:11
Location: Derby

Re: Khamsin Virtual Racecar Challenge 2016

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Yeah I know, I looked into turning one of my F1 era KVRC cars into a Grand Prix 4 model but it was a right pain

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CAEdevice
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Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

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RicME85 wrote:Yeah I know, I looked into turning one of my F1 era KVRC cars into a Grand Prix 4 model but it was a right pain
It's OT, but I really liked GP2 by Geoff Crammonf... then I had a 20 years pause with driving simulators and now I use AC.

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LVDH
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Joined: 31 Mar 2015, 14:23

Re: Khamsin Virtual Racecar Challenge 2016

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CAEdevice wrote:... I really liked GP2 by Geoff Crammonf... then I had a 20 years pause with driving simulators and now I use AC.
Same here, since then I have not seen anything good. And thanks to the telemetry I learned a lot about cars.

This video is very cool, but too short. Please show us more.
This is exactly what our cars deserve. Can you have all of them racing against each other?

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CAEdevice
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Joined: 09 Jan 2014, 15:33
Location: Erba, Italy

Re: Khamsin Virtual Racecar Challenge 2016

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LVDH wrote:
CAEdevice wrote:... I really liked GP2 by Geoff Crammonf... then I had a 20 years pause with driving simulators and now I use AC.
Same here, since then I have not seen anything good. And thanks to the telemetry I learned a lot about cars.

This video is very cool, but too short. Please show us more.
This is exactly what our cars deserve. Can you have all of them racing against each other?
I should study the AI configuration of AC to simulate a race, but the most important problem is that to re-create the geometry of other KVRC cars would be a huge job... (2h for a symbolic representation, more than 20h for a good model, 50h for a detailed model...). Unfurtunaltely CAD formats like STEP / IGES / STL can't be imported into a driving simulator, even if the FBX conversion is theoretically possibile. In the future I will make a test with the same 3D data but different colors and aero data (it would give an idea of how a KVRC race would be). The video si short fot two reasons: I have only the free version of FRAPS (video capture), and the model is far from being complete, so I avoided to show what is not ready yet.

PS: Papyrus Indy 500 was not inferior to GP2. Obviously AC (and RFactor2) are better, but twenty years later!