Question

Which one of the following is true with respect to the phugoid mode of an aircraft?

• A. long period and weak damping
• B. long period and strong damping
• C. short period and weak damping
• D. short period and strong damping

Hint:

Phugoid = long period, low damping oscillation between speed and altitude.

Answer 1

The Correct Option is A

The phugoid mode of an aircraft is a type of motion characterized by long period oscillations with weak damping. This mode typically involves exchanges between kinetic and potential energy, as the aircraft undergoes motion similar to a gentle, slow pitching. Thus, the damping remains weak, leading to gradual energy exchange and resulting in a long period of oscillation. Based on the options provided:

• Long period and weak damping
• Long period and strong damping
• Short period and weak damping
• Short period and strong damping

The correct answer is "long period and weak damping."