search

TUDelft-CNS-ATM / openap

Open Aircraft Performance Model and Python Toolkit
https://openap.dev
GNU Lesser General Public License v3.0
117 stars 23 forks source link

Drag computation results are strange when TAS is near zero #29

Open RobertPastor opened 2 days ago

RobertPastor commented 2 days ago

Hello, I am using Openap to build trajectories. Concerning the Drag computations it seems that the results are strange when the TAS is very small.

drag.clean(mass=60000, tas=2.50, alt=200) 108110636.29957953

drag.nonclean(mass=60000, tas=1.50, alt=100, flap_angle=10, landing_gear=True) 289884172.22652894

Is this the correct way to use the library ? Thanks for your help Robert

RobertPastor commented 11 hours ago

I recently read a condition applying to the Drag computation, in the document aerospace_07_00104_v2.pdf it is written that the Drag formulae apply only when the aircraft is airborne. Hence, my previous raised issue might be discarded.