How to solve for bending moment?

[airstrike_ola]

Hello, I'm a newbie here, please help me to solve for the bending moment of my design airplane. I want to know if my wing spar is strong enough to support the weight of my design which is 490 lb. I want also to know if what is the breaking point of the wing spar. Please see the attached picture.

Thank you...

 

[minger]

You can assuming that your beam is simply supported at the wing tips, with a point load at the center, and then just either simply compute the bending moments in your beam. The stress is then just
<br /> \sigma = \frac{My}{I}<br />

Or I'm sure a decent google result will give you the closed form solution given your geometry.