Thrust and Stability

One way to achieve even thrust along the entire length of a propeller is to:

• increase the angle of attack from the root to the tip

• lessen the angle of attack from the root to the tip

• maintain a constant angle of attack along the propeller

• increase the blade width from root to tip

A pilot would set a course pitch on a constant speed propeller during when and why?

• During takeoff to maximize thrust

• On a level cruise flight because it is more efficient and minimizes rpm which improves fuel efficiency

• During landing to reduce speed

• In turbulent weather to maintain stability

What rpm would be suitable for a takeoff with a constant speed propeller and why?

• 2,200 rpm because it conserves fuel.

• 2,400 rpm because it balances thrust and efficiency.

• 2,600 rpm because it needs to create a lot of thrust to have an efficient takeoff.

• 2,800 rpm because it maximizes engine power.

When is the cork-screw effect left turning tendency the most pronounced and why?

• During high-speed flight due to increased airflow over the wings.

• During low-speed flight due to increased propeller wash over the tail.

• During high-altitude flight due to reduced air density.

• During descent due to increased gravitational pull.

Gyroscopic action is when?

• A spinning object maintains its orientation due to angular momentum.

• An object moves in a straight line without any external force.

• A stationary object starts spinning without any external force.

• An object changes its orientation randomly.

What of Newton's laws of motion is thrust an example of and why?

• The first law because thrust is a force that changes the state of motion.

• The second law because thrust is related to acceleration and mass.

• The third law because the propeller pushes air to create thrust and because of this there is an equal amount of thrust coming from the opposite direction.

What is an advantage of a constant speed propeller?

• Permits the pilot to select the blade angle for the most efficient performance.

• Increases the aircraft's maximum speed.

• Reduces the need for regular maintenance.

• Allows for quieter engine operation.

What determines the longitudinal stability of an airplane?

• The shape of the wings

• The position of the center of gravity

• The size of the engines

• The color of the fuselage

A designer wants an airplane to be very maneuverable on the pitch axis, so they would__ and why.

• place the horizontal stabilizer closer to the wing because it reduces the movement of the arm of the plane.

• increase the size of the vertical stabilizer to improve yaw control.

• add more weight to the nose of the airplane to stabilize the pitch.

• reduce the size of the wings to decrease lift and increase maneuverability.

Changing (moving) the center of gravity would affect the stability of the object because:

• It increases the weight of the object.

• It changes the distribution of mass.

• It alters the shape of the object.

• It affects the color of the object.