T/O trim value

[eddito2010]

Hello,

Can someone explain how to calculate the value of the needed trim for takeoff? I will appreciate a lot. 

 

Thank you

[N1K]

Don’t believe thats a simple question in xplane. From what I gather, the slider on the weight screen for CG shows the displacement from the models reference point in inches. 

Don’t think LES state what the datum they used is anywhere, nor is the charts for it in the aircraft package. If you do find them, theres likely still some math required to convert it to Saab which use the nose as the datum, or convert it to %MAC. Which may again require you finding what the station of the leading and trailing edge are. With all of that you could determine the trim setting.

Alternatively, buy that app thats kicking around where all that has been done, or set neutral if not slightly nose up and hope it works 

[eddito2010]

Thank you N1K for your response. How all others (including you) set trim for takeoff? I set it to what i suppouse it should but it is far from the correct method.

[Milan Bogicevic]

What i do is when using flap 0 i put trim 1 notch up on the gague, and when i use flap 15 i leave it at 0. All that with cg position on default in load screen. Works well for me

[eddito2010]

Thank you....will try

[jgniewkowski]

And zero is the bottom of the green area?

[N1K]

middle