Hi!
I study a lot of profiles to use in my future design with XFoil. I'm studying this programm because it's amazing! But I don't understand 100% the Ncrit factor.
In Drela website:
situation Ncrit -
sailplane 12-14
motorglider 11-13
clean wind tunnel 10-12
average wind tunnel 9 <= standard "e^9 method"
dirty wind tunnel 4-8
And now my question. I want to analyse the landing for hot days and h=5000ft (density 0.974 Kg/m^3). Which Ncrit should I use? I use Ncrit=7 because the air is not clean, but I'm not sure. So...anybody can help me?
Thank you!
I study a lot of profiles to use in my future design with XFoil. I'm studying this programm because it's amazing! But I don't understand 100% the Ncrit factor.
In Drela website:
situation Ncrit -
sailplane 12-14
motorglider 11-13
clean wind tunnel 10-12
average wind tunnel 9 <= standard "e^9 method"
dirty wind tunnel 4-8
And now my question. I want to analyse the landing for hot days and h=5000ft (density 0.974 Kg/m^3). Which Ncrit should I use? I use Ncrit=7 because the air is not clean, but I'm not sure. So...anybody can help me?
Thank you!
