This is the fourth attempt to get this thru the list - now I split them in two
parts
Hi Folks,
here some information to the mails of the last days.
There was 4 reasons why the Mercedes with his Air brake was banned - first the
safety - the car went so unstable (lost contact) on the front wheels that they
got a hard time to steer the car around the corner. Second - they not only
lost the speed, they also lost sometimes the brake, which was not good for a
car behind. Third - due to much higher brake rate there was all the time the
risk that a other car crashed into the racer to the not so effective braking
and at last, turbulences - this air brake produce a so high (vaccum)
turbulences (like this special wing the cart series use on high speed tracks
that the cars can run faster in the windshade of the forward car to overtake
easier) that it increase the risk of #3 and also make the behind car very
unstable like a hard cross wind.
A comment to Mayf's calculation.
at first a simple calculation to get a feeling what "destroying speed" means.
If someone crash with his car into a wall and comes in a time of 0.1 second to
the halt from a speed by 35 mph (50 kph), the driver - if he weights 150
pounds (I know that this is not american standard) normal - his weight will
increase to 3000 pounds. This is the force which goes on the drivers body from
the deceleration.
So now to Mayf's.
It's a very interested calculation and may be to low (this is not a joke).
The problem is, how much force goes on the square inch of the cross section of
the rope (and of the bracket/bold/welding threat aso.). Mayf saw this correct,
that the power which will be create comes from the resistance area of the
chute, from the speed (when the chute explode in the air) which "runs" against
the chute and from the airflow over and behind the car. The airflow over the
car is incredible - see a Golf convertible - the soft top produce by higher
speed a real bubble shape.
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