Good luck!

1. 1) When landing gear on an aircraft retract, the amount of drag they produce increases as they approach the airframe, because of...
   Boldmethod

   Interference drag is produced by the mixing of two air streams around two different aircraft surfaces. The angle between the surfaces determines the amount of interference drag that is created. Interference drag is most pronounced at angles less than 90 degrees. This is why drag increases when landing gear are retracting. Once the gear are in the wheel wells, drag is reduced because interference drag is no longer a factor.

   Interference drag is produced by the mixing of two air streams around two different aircraft surfaces. The angle between the surfaces determines the amount of interference drag that is created. Interference drag is most pronounced at angles less than 90 degrees. This is why drag increases when landing gear are retracting. Once the gear are in the wheel wells, drag is reduced because interference drag is no longer a factor.

   1. Boldmethod

      
   2. Boldmethod

      

   1. Boldmethod

      
   2. Boldmethod

      
2. 2) Within the troposphere, as you climb in altitude, the speed of sound...
   Wilson Hui

   The speed of sound decreases as temperature decreases. Because of that, the speed of sound decreases in the troposphere, because as altitude increases, temp decreases.

   The speed of sound decreases as temperature decreases. Because of that, the speed of sound decreases in the troposphere, because as altitude increases, temp decreases.

   1. Boldmethod

      
   2. Boldmethod

      

   1. Boldmethod

      
   2. Boldmethod

      
3. 3) Which statement is true about flaps?
   Boldmethod

   Flaps increase lift, reduce stall speed, and increase drag. 

   Flaps increase lift, reduce stall speed, and increase drag. 

   1. Boldmethod

      
   2. Boldmethod

      

   1. Boldmethod

      
   2. Boldmethod

      
4. 4) You and a friend are in two identical airplanes at the same altitude. You're 300 pounds under max gross weight, and your friend is at max gross weight. Both of your engines quit. You both pitch for your aircraft's best speed to achieve the max lift-to-drag ratio (L/D). What happens next?
   Boldmethod

   When you pitch for best glide, you are converting your airplane's potential energy (altitude) into kinetic energy (speed) in order to optimize the maximum distance you are able to travel in a power off situation. Changes in weight directly affect the indicated airspeed for which best glide is maintained. The heavier aircraft will have a higher indicated airspeed (more kinetic energy) and a higher rate of descent, meaning the heavier aircraft will reach the ground quicker. A lighter aircraft of the same model will cover the same horizontal distance but will take a longer period of time to do so.

   When you pitch for best glide, you are converting your airplane's potential energy (altitude) into kinetic energy (speed) in order to optimize the maximum distance you are able to travel in a power off situation. Changes in weight directly affect the indicated airspeed for which best glide is maintained. The heavier aircraft will have a higher indicated airspeed (more kinetic energy) and a higher rate of descent, meaning the heavier aircraft will reach the ground quicker. A lighter aircraft of the same model will cover the same horizontal distance but will take a longer period of time to do so.

   1. Boldmethod

      
   2. Boldmethod

      

   1. Boldmethod

      
   2. Boldmethod

      
5. 5) As the airstream moves aft on an airfoil, the laminar boundary layer...
   Boldmethod

   As the laminar boundary layer moves aft on an airfoil, the air begins to increase in thickness, eventually forming a turbulent boundary layer. This transition from laminar to turbulent boundary layers is rapidly increased as the angle of attack is increased.

   As the laminar boundary layer moves aft on an airfoil, the air begins to increase in thickness, eventually forming a turbulent boundary layer. This transition from laminar to turbulent boundary layers is rapidly increased as the angle of attack is increased.

   Boldmethod
   1. Boldmethod

      
   2. Boldmethod

      

   1. Boldmethod

      
   2. Boldmethod

      
6. 6) Which condition describes a longitudinally stable aircraft?
   Boldmethod

   An aircraft improves its longitudinal stability about the lateral axis (pitch) when the center of lift is aft of the center of gravity.

   An aircraft improves its longitudinal stability about the lateral axis (pitch) when the center of lift is aft of the center of gravity.

   Boldmethod
   1. Boldmethod

      
   2. Boldmethod

      

   1. Boldmethod

      
   2. Boldmethod

      

Well, you have room for improvement...

You scored % But think about how much you just learned!

Not bad, you have most of these concepts down...

You scored %

Nailed it!

You scored % Well done.