Don't know what airfoil it is but it's symetrical airfoil and incidences is 0 degrees (measure with ruler and a cadprogram but I have loaned a meter right now). Thrustline of the engine I placed in the same line as the wing and after all problems with dive I found that stab is 2 centimeters higher than the wing. So my thoughts is that stab wants to be inline with wing and therefor generates a dive. My trim on the elevator is 5 degrees up.