Ciro Pabón wrote:The deceleration of a dragster is also larger than the one of an F1 car: once you deploy the parachutes and brakes, you have to resist 4 Gs (39 m/s2), more than a space shuttle astronaut during reentry. No Brembo carbon fiber brakes can provide you with the same decceleration, no matter what the forum says.
Brembo itself says otherwise
http://www.brembo.com/ENG/Formula1/2009 ... _eng13.pdf
Here's Monza data - 5g deceleration routinely, lap after lap. Try to do the same with chute
Oops. My mistake: the figures I had (also taken from Brembo site) peaked around 3.5 Gs, if I remember well, timbo, but
that was only for Catalunya and Albert Park (around 2006), the only tracks I analyzed in deep. Thanks.
Which leads me to the following question: have the brakes improved during the last years?
If they haven't, why Brembo posted smaller deceleration values for those two particular tracks some years ago?
Is it because at Monza the speed is higher, thus the downforce is also larger, so you can get larger deceleration values?
If that's so, then the braking force is dependent on downforce
(something I hadn't thought about before, but, of course, very logical).
If I'm right, that degrading of braking force with smaller speeds or with less downforce wouldn't happen in the same degree with a parachute... because drag force is proportional to the square of the speed, while downforce is proportional to the cube of the speed: if your car is at low speed or if your car provides you little downforce, a parachute is better.
So, perhaps, maybe, possibly, that's the reason why parachutes are used in cars that are built for straight acceleration
and, thus, minimum downforce and/or drag associated with it, while brakes should be used in cars that are built for lateral acceleration and maximum downforce (yeah, I know: pure speculation on my part until we get some figures, but I have always wondered why drag cars have to use parachutes instead of regular brakes: it seemed like overkill to me, until I read your post). So, I could say (if I'm right and I'm not sure about being right): try to brake a drag car at 500+ kph with a Brembo brake race after race.
That would explain (a mistery to me, until now) why the figures for maximum decceleration varied from curve to curve at those two tracks
I mentioned. Double thanks, dear timbo.
Finally, my conclusion: the faster you go, the harder you can stomp on brakes. Am I right, forum?