Question

For a general aviation airplane, which one of the following has a destabilizing effect on its static roll stability?

• A. Wing with a positive dihedral angle
• B. Fuselage with a high wing
• C. Fuselage with a low wing
• D. Swept back wing

Hint:

For better roll stability, an aircraft is generally designed with a high wing or positive dihedral, which enhances the restoring moment during a roll. A low-wing configuration can result in reduced static roll stability.

Answer 1

The Correct Option is C

A fuselage with a low wing configuration has a destabilizing effect on an aircraft's static roll stability. In this configuration, the aircraft's center of gravity and the center of lift of the wings are closer together, which reduces the restoring moment when the aircraft rolls. This leads to a higher chance of instability in roll. A positive dihedral angle, a high wing configuration, and a swept-back wing generally contribute to increased roll stability.