Discussion
Statement I: A dorsal fin increases the fin's contribution to directional stability at small sideslip angles.
Statement II: A dorsal fin delays fin stall at large sideslip angles.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Statement I is incorrect but Statement II is correct
The second statement is right: a dorsal fin's swept, low aspect ratio leading edge sheds a vortex that keeps the flow attached well beyond the fin's natural stall angle, preserving stability in a large sideslip and preventing rudder lock.
The first is wrong. At small sideslip the fin is unstalled and working normally, and the dorsal fillet adds very little side force there - its contribution is negligible until the angles become large. It is a fix for the extreme case, not a way of adding cruise directional stability.
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