Originally Posted by
tdracer
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 there nothing anecdotal about 37C and 90+% humidity if you're operating near the equator.
1. I didn't say its insignificant, I suggested its an upper limit, already included in the calculations.
2. The highest recorded dew point anywhere in the world was 35C/95F in Saudi Arabia, and 33C/91F in Florida. The norm is definitely closer to 30C in the tropics.
3. 37C and 90%RH is false (dew point 35C/95F). I challenge you to show me a Metar showing a dew point above 30C.
Reference:
https://en.wikipedia.org/wiki/Dew_po...ewpoint-RH.svg
Edit: An explanation of why this 'myth' arises:
https://www.washingtonpost.com/news/capital-weather-gang/wp/2013/07/08/weather-weenies-prefer-dew-point-over-relative-humidity-and-you-should-too/