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Relative humidity in standard atmosphere?

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Old 02-17-2010, 06:54 PM
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quoted out the Cessna 402 information manual "ISA... International standard atmosphere in which the air is a dry perfect gas..."
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Old 02-18-2010, 11:21 AM
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Originally Posted by 9kBud View Post
quoted out the Cessna 402 information manual "ISA... International standard atmosphere in which the air is a dry perfect gas..."
Nice. Hopefully he asks me again.
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Old 02-18-2010, 01:18 PM
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its been a while since I played with a density altitude calculator, but i remember trying to input all the standard day values, and when it came to RH, 0 did not produce field elevation for DA, it was about 20% in order to get sea level/PA/DA to all be close to equal
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Old 02-18-2010, 08:03 PM
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All the calculators I pulled want dew point, not RH. Picking -300F would give a 0 DA. Remember to put in 29.921
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Old 02-19-2010, 04:07 PM
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http://home.anadolu.edu.tr/~mcavcar/common/ISAweb.pdf

Wiki also answers it nicely, with less jargon.

In short, RH doesn't play a roll.
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