skylane42

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I have a delta wing with slight under camber airfoil. I am putting a pusher on the trailing edge. What kind of thrust angle would be right for this configuration, positive or negative thrust angle?

jamespal

This sounds cool. I have no experiance with a pusher or a delta wing, but all of the tail less plans I have seen have a fair amount down thrust maybe 5-7 degrees with the cg way forward. The airfoil is a reflex, meaning the natural shape is to pull the nose up. Pitch stability comes from aero forces rolling the nose up, working against the forward cg and as the power increases the aero forces increase. More power should add to the nose up pitch. You might want to find a similar aircraft. If not, it may be worth making a small foam glider to get the cg figured out.