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Forum: Tech Log

8th Mar 2019, 16:09

Replies: 22

Effect of humidity on Airbus or Boeing performance.

Views: 7,263

Posted By tdracer

Which affects thrust at N1 how exactly?

Which affects thrust at N1 how exactly?

Forum: Tech Log

8th Mar 2019, 04:47

Replies: 22

Effect of humidity on Airbus or Boeing performance.

Views: 7,263

Posted By tdracer

Which if you go back and read my original post,...

Which if you go back and read my original post, is exactly what I stated:
"For N1 rated engines, this is accounted for in the power setting charts - basically added performance margin at high temps...

Forum: Tech Log

8th Mar 2019, 03:19

Replies: 22

Effect of humidity on Airbus or Boeing performance.

Views: 7,263

Posted By tdracer

4% specific humidity is ~1.5% density compared to...

4% specific humidity is ~1.5% density compared to dry air - that's 1.5% thrust at N1. You may not consider 1.5% thrust significant, but those of us who worry about engine performance sure do.
And...

Forum: Tech Log

8th Mar 2019, 03:10

Replies: 22

Effect of humidity on Airbus or Boeing performance.

Views: 7,263

Posted By tdracer

Arent most operations temperature limited at that...

Arent most operations temperature limited at that range?

Thanks for making my point. At high temps, you are temperature limited - now take away more thrust because of very high humidity and see...

Forum: Tech Log

7th Mar 2019, 05:38

Replies: 22

Effect of humidity on Airbus or Boeing performance.

Views: 7,263

Posted By tdracer

YES!!! You need high temperatures to have high...

YES!!! You need high temperatures to have high specific humidity. Basic physics. Look at the chart Megan posted - specific humidity is all that matters since it reduces the air density - and isn't...

Forum: Tech Log

6th Mar 2019, 18:04

Replies: 22

Effect of humidity on Airbus or Boeing performance.

Views: 7,263

Posted By tdracer

High specific humidity does adversely affect...

High specific humidity does adversely affect engine thrust - due to the lower density of the air. This has a much larger effect at N1 than at EPR (obviously signficant only at higher temps, since...

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