Discussion
An aeroplane with a low wing and no sweep is found to be spirally unstable, slowly tightening any turn that is not corrected.
Which change would most directly address it?
Answer: A
Spiral instability follows from too little dihedral effect relative to directional stability. Adding dihedral strengthens the rolling response to sideslip and rebalances the two modes, whereas a larger fin would worsen the imbalance.
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