"RacinBob" (racinbob)
07/26/2020 at 13:12 • Filed to: None
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"RacinBob" (racinbob)
07/26/2020 at 13:12 • Filed to: None | 5
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Good news is he walked away. And it will buff out with enough $1000 bills.
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Who is the Leader - 404 / Blog No Longer Available
> RacinBob
07/26/2020 at 13:32 |
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How does that happen? Too much downfor ce? Not enough? Too many bumps? All of the above?
TheTurbochargedSquirrel
> Who is the Leader - 404 / Blog No Longer Available
07/26/2020 at 13:42 |
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Car in front takes air off the following car which reduces the downforce such that instead of just decompressing the suspension over the crest it instead lifts the front wheels. At those speeds when the front wheels get into the air it turns into a parachute and flips the car over backwards.
ItalianJobR53 - now with added 'MERICA and unreliability
> Who is the Leader - 404 / Blog No Longer Available
07/26/2020 at 13:45 |
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To my untrained eye it seems similar to the Mercedes CLK GTR crash from the late 90s...the oncoming air enters the front wheel wells from the front of the car as it comes over a crest and that lift the front end up. At this point, the rear is still producing downforce which causes the flip. Its probably not helped by the fact that he is following other car (I think that decreases front downforce?)
FIA mandated open front fenders (or vent on the fender) coz of that iirc, like on this R10 TDI:
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RacinBob
> Who is the Leader - 404 / Blog No Longer Available
07/26/2020 at 13:54 |
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I think these pictures illustrate the main causes.
1. He was cresting the hill, so the car would get light there.
Below is a side view from a microsecond before taking off . Notice the ride height and the front tires leaving the ground.
2 . See that he is in the draft of the other car. So. the front wing isn’t getting air or as much downforce which isn’t helping things.
3. Meanwhile the rear wing is better in the airstream. As such it is providing a rotating force element bushing the back down behind the axle resulting in the front coming up.
4. Note the engine torque to the rear wheel provides a reaction force that also lifts the front end.
Remember he is probably going 125 mph which is easily fast enough for a
piper cub to take off.
So as a result when
front end comes up and air gets under the car and underneath air
pressure builds exponentially under the front
and she comes over.
I suppose the reason that these cars are doing this is that they don’t have effective venturis underneath and rely mostly on the wings to do the downforce work. As a result the aero center of force is well back and as a result if the front lifts, there isn’t enough aero force to stick it back down.
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Who is the Leader - 404 / Blog No Longer Available
> RacinBob
07/26/2020 at 14:13 |
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If anything, I’m wondering why this doesn’t happen more often as the conditions here aren’t too uncommon. Drafting up a hill isn’t exactly a reckless move, so was it just a freak thing?
John Norris (AngryDrifter)
> RacinBob
07/26/2020 at 14:28 |
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Wow. Quite the ride.
ClassicDatsunDebate
> Who is the Leader - 404 / Blog No Longer Available
07/26/2020 at 14:53 |
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Because ground effect aero is “ illegal” now because of this exact thing.
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ClassicDatsunDebate
> RacinBob
07/26/2020 at 14:56 |
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The reason no race class allows ground effect aero anymore.
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RacinBob
> Who is the Leader - 404 / Blog No Longer Available
07/26/2020 at 15:37 |
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My guess is this is a flat bottom car without aero venturis underneath to cause suction underneath. As a result if air gets under it, they tend to take off.
pip bip - choose Corrour
> RacinBob
07/27/2020 at 05:30 |
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bet he wasn’t expecting that!