Silver State Classic (New member in the 200 mile Club)
02-22-2011, 12:49 PM
#65
Rennlist Member
in order to get airborne, you need more lift than weight. even though the 928 or most cars are shapped like an airfoil, its not a ver good one. you can measure the effects of pressure drop on the hood and top of car with a preasure sensor. having done that at 130mph, i can tell you that it is not enough to lift the ar. -.08psi comes to mind. total area is near 90sf, so, only about 1/2 the car has this "vacuum", so thats 45sqf, or near 300lbs of lift . car weights 3400lbs, so you can see its a long way to taking off! But, if you are not balanced and the nose is lighter, and starts to rise, then the pressure under the car rises, and the pressure on top goes down and this changes EVERYTHING dramatically. so, this is why cars flip over at the salt flats. keep the car low to the ground, use air dams, and you only have a little bit of lift to deal with. this is why a wing i the rear is not such a great idea. its making downforce and most folks dont ahave enough downforce up front. thats a problem. Air dams, lowering the car, all keep the nose down. with out addiing downforce .
02-23-2011, 12:32 AM
#66
Race Director
I can honestly say the most powerful cars I have ridden in are these:
Cobra replica with a 540 Keith Black...it was stupid...anything more than 1/2 throttle would destroy the tires....but wheelspin at 80mph is entertaining...
A 95 Trans Am racer with a 422 ci LS engine with 725hp....slightly fast...
Tim's ZR1.....by far the "nicest" car of the bunch..but still massive power!!!
The Beast is no slouch either...but it felt different....like its just hitting its stride at 80mph....
02-23-2011, 06:31 AM
#67
Rennlist Member
WOW!
