Which description describes a split flap?

Which description describes a split flap?

• A. A section of the trailing edge that hinges down to produce more lift
• B. The trailing edge is split such that a part hinges down and a part remains fixed
• C. A flap that moves aft along tracks
• D. A flap positioned below the wing to allow airflow

Answer: (B)

A split flap is defined by the trailing edge being divided into two parts, with a portion hinged downward while the other portion remains fixed. This arrangement means only part of the trailing edge moves, creating extra camber and lift at lower speeds while increasing drag. The key idea is the split: one segment deflects, the other stays put, which is what distinguishes it from a plain flap that hinges the entire trailing edge. The other descriptions describe different mechanisms—one where the whole trailing edge moves, one where the flap slides back along tracks, and one where the flap is located under the wing—so they don’t match the split-flap setup.

A split flap is defined by the trailing edge being divided into two parts, with a portion hinged downward while the other portion remains fixed. This arrangement means only part of the trailing edge moves, creating extra camber and lift at lower speeds while increasing drag. The key idea is the split: one segment deflects, the other stays put, which is what distinguishes it from a plain flap that hinges the entire trailing edge. The other descriptions describe different mechanisms—one where the whole trailing edge moves, one where the flap slides back along tracks, and one where the flap is located under the wing—so they don’t match the split-flap setup.