Canard Configuration and Sum of Moments

[mpm]

I'm in an aerodynamics class, and I have this canard configuration I'm trying to figure out for a final exam.

I need to find the sum of the moment about the center of gravity.

I may cannot be helped without the drawing being posted.

So far this is what i have:

Mcg = Mac - (lcg + lw)Lw + (lc-lcg)Lc

CMcg=-aw*alpha(hn-hcg) + Cmo

Each letter after the first letter (ie Mcg) is a subscript. So cg would be the subscript. I just don't know how to do that on here.

Anyway, my remaining equations which I can't seem to figure out is to derive expressions for hn and Cmo

Can anyone possibly help me with this or is more info needed?

 

[Astronuc]

use <sub>and [/ sub] for subscript, but remove space between / and sub.

I am guessing that M is moment, L is lift, and l is moment arm for the L components. And subsript 'c' refers to canard, and 'cg' center of gravity.

Please explain the other terms.

There should be N equations for N unknowns, which included equations for forces (e.g. lift and weight, drag and thrust) and moments.</sub>

 

[mpm]

L_C is lift due to canard

L_W is lift due to wing

Alpha is the angle of attack for the wing.

a_w is lift curve slope of the wing

h_n is the distance to the neutral point

h_cg is the distance to center of gravity

I believe you are right on the moment arms being the l's.

C_Mcg is the slope of the moment curve I believe.

V_H is the volume ratio

I think this is all that is needed. I may try and scan a picture of the diagram that I have if more is still needed.

Just let me know if more is needed.

Thanks in advance for all the help.