Suppose the pilot of a conventional aircraft decides to increase the thrust of this aircraft, but wants to keep the pitch angle (and angle of attack) the same. What kind of elevator deflection should he give to prevent his aircraft from pitching: a positive or negative one?
Apologies for the incorrect information provided earlier. You are correct.
To prevent the aircraft from pitching up due to increased thrust, the pilot should give a positive elevator deflection.
When the line of action of the engine thrust is below the aircraft's center of gravity, an increase in thrust will create a nose-up pitching moment, causing the aircraft to pitch up. By applying a positive elevator deflection, the elevator moves upwards, creating a downward force on the tail. This counteracts the nose-up pitching moment caused by increased thrust, preventing the aircraft from pitching up and maintaining the desired pitch angle and angle of attack.
Therefore, to maintain the same pitch angle and prevent pitching, the pilot should give a positive elevator deflection.
The climb angle of an aircraft can be determined by calculating the difference between the pitch angle and the angle of attack.
In this case, the angle of attack is given as 5.6 degrees and the pitch angle is given as 8 degrees.
Therefore, the climb angle can be calculated as:
Climb angle = Pitch angle - Angle of attack
= 8 degrees - 5.6 degrees
= 2.4 degrees
So, the climb angle of this aircraft is 2.4 degrees.
To determine the angle of sideslip experienced by the aircraft, we need to find the difference between the aircraft's course and heading angles.
In this case, the course angle is given as 80 degrees, and the heading angle is given as 84 degrees.
The angle of sideslip can be calculated as:
Angle of sideslip = Course angle - Heading angle
= 80 degrees - 84 degrees
= -4 degrees
Therefore, the aircraft experiences a sideslip angle of -4 degrees. Negative values indicate a sideslip to the left, and positive values indicate a sideslip to the right.
o prevent the aircraft from pitching, the pilot should give a positive elevator deflection.
n case the line of action of the engine thrust is below the aircraft centre of gravity and the thrust is increased, this will result in a nose-up pitching moment, which is positive.
The pilot should thus deflect the elevator such that the nose goes (back) down: negative pitch. And since a positive deflection corresponds to a negative aircraft response (and vice versa), the pilot should apply a positive deflection of his elevator.
Suppose an aircraft flies under an angle of attack of 5.6 degrees, and at a pitch angle of 8 degrees. Determine the climb angle of this aircraft, in degrees.
Suppose a passenger aircraft flies with a course of 80 degrees and a heading of 84 degrees (both according to the compass). Determine the angle of sideslip it then experiences.
To prevent the aircraft from pitching, the pilot should give a negative elevator deflection.
Elevator controls the pitch or the up and down motion of the aircraft. When the pilot applies a negative elevator deflection, it means the elevator is moved upwards, creating a downward force on the tail of the aircraft. This downward force on the tail counters the increased thrust, preventing the aircraft from pitching up due to the increased lift generated by the additional thrust.
By applying a negative elevator deflection, the pilot is essentially repositioning the elevator to generate a downward force on the tail, maintaining the same pitch angle and angle of attack.