How to trim on the program??

[Alfredo Escolano Lopez]

Good afternoon.

I am a student who is new to your program. I was wondering if the program could be able to , flying at cruise speed,  give you the angle of deflect of the control surfaces in order to keep the plane stabilized.
Thanks.

Alfredo

[Rob McDonald]

There is not automatic trim capability at this time.  However, you can easily get all the information you need.

Build a model with a trim surface (elevator).  In the VSPAERO GUI, set up the control surface grouping with gains of 1,-1 so both sides of the elevator go up or down together.

Run a stability run, this will perturb all of the flight degrees of freedom one at a time (including your control surface) and will report derivatives.

Take that data, build a normal trim matrix and solve.

[CLalpha CLdeltae;CMalpha CMdeltae] [alpha; deltae] = [CL-CL0; -CM0]

Or something like that.

Rob

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[Alfredo Escolano Lopez]

Okay thanks. I will try.

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