Discussion
Statement I: Directional and lateral stability can be analysed independently of one another.
Statement II: A sideslip disturbance produces both yawing and rolling moments.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Statement I is incorrect but Statement II is correct
The second statement is sound and it refutes the first. A sideslip disturbance acts on the fin to produce a yawing moment and, through dihedral, sweep and the fin's height above the rolling axis, a rolling moment as well.
Because a single variable drives both, the equations are coupled and the two cannot be analysed independently. The lateral-directional modes exist only because of that coupling: Dutch roll alternates yaw and roll, and the spiral mode's stability turns on the relative strength of the weathercock and dihedral effects. Treating them separately would predict neither.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development