The online racing simulator
What an amazing progress thread! Smile
Quote from Egor K :
Also want make 'XP5' version as separate mod (raised redline, speed measuring equipment and fixed black color).

Thank you for this! Perhaps "PIONEER" code is finally worth having used in NFSIISE game. Smile
Currently the downforce-distribution is 59.1% Rear, would it be possible to change it to 56% Rear for testing?

That should help reduce understeer & make it easier to bring the front tyres to optimum temperature.

Thanks, & nice mod by the way.Thumbs up
CoP (hereinafter — Centre of Pressure) displayed in the garage without driver is 59.1% rear, but shifts to 57.8% with driver in. To fix the ‘specs display error’ I need to add an ‘aero centre’ subobject, which is easy, just won’t publish a new version for such minor changes.

But the main thing is that on track CoP is 57.8% rear.

Now let's dive into what I found about longitudinal CoPYa right
  1. printout of tunnel 3/10 scale model run results (used as an illustration on page 74 of ‘Driving Ambition’)

    Wheelbase : 32.2in = (roughly) 2718mm * 1/25.4mm * 3/10
    Centre of pressure = -17.50in to rear of Datum (Datum is Front Wheel)

    So, it’s 54.3% rear for ‘Run No : 214’, but Gordon says there were around 1000 wind tunnel tests and it seems like the early models had a longer nose.

  2. Quote from Driving Ambition page 76 :Initial targets were ... CoP almost coincident about the centre of gravity ...

  3. printout ‘Chassis/Suspension design targets’ (used as an illustration on page 127 of ‘Driving Ambition’)
    Quote from Driving Ambition page 127 :23. Centre of Pressure 57% of wheelbase (min)


Finally, looking at this angle of attack and noting speed is around 300 km/h, I think CoP should not be moved forwardBig grin

Perhaps the best solution nowadays is to check CoP using OpenFoam, but first need to finish refining the model's roof and pillar areas. However, won't happen soon because I want to complete '2017 Yellowbird' first.

I do appreciate your handling improvement suggestion overall, just IMO it will make URC1 less like McLaren F1. Anyway, please feel free to raise any objections — I’d be happy to discuss.

BTW, I noticed your top result on the ‘JaR’ hotlap system; glad to see you guys challenging URC1.

And sorry for the late reply.
Attached images
URC1_CoP.png
mlf1_1.png
mlf1_2.png
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Ultimate Road Car
(29 posts, started )
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