ViperPowa
Full Access Member
kickinassrt-10 said:
Density Altitude, basically pressure altitude adjusted for non standard temperature. High temperature and humidity causes reduction in air density, so in those hot and humid conditions the Density Altitude may be significantly higher than the actual elevation/altitude at which your measuring.
Calculating the DA also takes into account the barometric pressure and actual elevation.
So when they are all bad for racing, high temps, high humidity, low barometric pressure, the higher DA will have a significant negative effect on your times you run. The higher the DA the more it will kill your times.
In the opposite, low temps, low humidity, high bar. pressure, you can actually be in a negative DA making your times faster than they would be at sea level +.
So if Patrick made a pass at 14.0@107mph at 2:00pm at his dragstrip which is 52 feet above sea level, the actual DA was 2106 feet above sea level in Kahului. So if you were to take the negative 2106 DA effect on his times away, it would turn that run into a [email protected].
This is just my best guess calculations as the DA was taken from the airport in Kahului and I don't know how far away from the airport his dragstrip is. According to MRP directions it seems real close. Also I don't know what time he made his passes at.
DA can be helpfull comparing times ran from in say, Hawaii, to times ran from where your at.
EDIT: Well dragtimes has thier temps readout for the Maui Raceway Park for sat., and it's the same as the temps at the airport, so the strip is real close, infact they must get thier data from weather underground.
So Pat you can get a real close calc on your runs with the time you made the passes at on the slip.
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:marchmellow:
