Discussion
Which statement about a dorsal fin is false?
Answer: D
Correct answer: It increases the rudder's control power
A dorsal fin is a fixed fillet carrying no movable surface, so it adds no control authority at all. It changes the moment produced by sideslip, not the moment produced by a pilot input.
The other three statements are true. It maintains stability at large sideslip and prevents rudder lock, both by delaying the fin stall; and it has a very low aspect ratio with a highly swept leading edge, which is exactly what lets it shed the stable vortex that keeps the flow attached. Stability and control are sized by different criteria, and conflating them is the trap here.
No comment is present. Be the first to comment.
Loading…
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