ventral fin - either of a pair of fins attached to the pelvic girdle in fishes that help control the direction of movement; correspond to hind limbs of a land vertebrate
As the depth of the upper head landmark point 2 and 11 decreases the snout becomes more pointed and angle of the snout- upper head- ventral fin deacreases.
On some airplanes a ventral fin on the fuselage or finlets on the horizontal stabilizer must be installed for yaw stability to counteract the aerodynamic effect of the floats.
Diagnosis: Males with red longitudinal stripes between the rays of the caudal fin, yellow stripe near dorsal and ventral fin margin; females with brown spots between caudal fin rays.
The unique feature of the Split Scimitar Winglet is that it uses the existing Blended Winglet structure, but adds new strengthened spars, aerodynamic scimitar tips, and a large ventral fin.
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