Discussion
Which of the following would not improve static directional stability?
Answer: B
Correct answer: Moving a tractor propeller further forward
Moving a tractor propeller forward makes matters worse. Its side force in sideslip acts at the disc, ahead of the centre of gravity, so lengthening that arm increases an already destabilising moment.
The other three all help, and all for the same reason: they add side force, or moment arm, aft of the centre of gravity. Enlarging the fin increases the force available, lengthening the fin arm increases the moment that force produces, and a ventral fin adds area aft and below where it stays clear of the wake at high incidence.
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