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## Homework Statement

If I have two spars running through an airfoil, which can be assumed to be two dimensional, which method would I use to find the stresses at the points where the spars are fixed? The loads would be lift and drag and what I need are the bending and shear stresses. Because I have more than one spar, I am looking at a statically indeterminate problem.

Another question, my professor said that to simplify the problem, I can apply the lift and drag forces at the quarter chord point. Would these forces act on the mean camber line or at the upper or lower surfaces?

## Homework Equations

## The Attempt at a Solution

I don't think I've been taught how to do this yet. I am willing to read ahead but I don't know what I should be reading. I have access to the Beer and Johnston Mechanics of Materials textbook