Control

Question 1

Lift and weight produce a nose up or down moment?

Answer 1

Down

Question 2

Thrust and drag produce a nose up or down moment?

Answer 2

Up

Question 3

The tailplane must supply the correcting moment to achieve….

Answer 3

Equilibrium

Question 4

If a download is required of the tailplane; the elevator must be deflected….

Answer 4

upwards

Question 5

What is a trim tab used for?

Answer 5

Relieve pilot of need to maintain force on control cables

Question 6

Tab down

Answer 6

Wing down

-The wing will move in the same direction as the tab is bent

Question 7

Rudder tab:

-Tab left

Answer 7

Tail left

Question 8

What does a link balance tab do?

Answer 8

Lightens up the control feel

Question 9

Link balance tabs work by

Answer 9

The elevator moves up; tab moves down

The elevator moves down; tab moves up

Question 10

Antibalance tabs work by

Answer 10

If the elevator moves up; the tab moves up

Question 11

What does a spring tab do?

Answer 11

The bellcrank is spring-loaded and when the force applied exceeds the limit; trim tab will assist

Question 12

What does anti balance do?

Answer 12

makes controls harder to move

Question 13

What do aileron spades do?

Answer 13

Reduce effort to defelct ailerons

-Deflects down when aileron is defelcted up

Question 14

When ailerons are operated; the aileron which moves downneffectively increases the ……. of that wing

Answer 14

Lift Coefficent

Question 15

What does asymetric drag cause?

Answer 15

Adverse Yaw

Question 16

What is the purpose of Differential ailerons?

Answer 16

Extend travel of up-going aileron, more parasite drag is produced. The additional drag on the downgoing wing evens up the drag and eliminates yaw

Question 17

How do Frise ailerons work?

Answer 17

When aileron is deflected downwards, wedge tucks up into wing.
When aileron is defelcted upwards, wedge protudes and generates parasite drag.
Reduces the amount of rudder deflection

Question 18

What is a horn balance used for?

Answer 18

• Protudes in front of control surface hinge, so that when the usrafce moves to one side; th horn is displaced into the airflow on the opposite side.
• Assists to deflect surface

Question 19

What is the mass balance used for?

Answer 19

• Controls unstable oscillations and flutter
• Weight is added to surface (Uusally aileron)
• brings the Cog closer to hinge

Question 20

What are spoliers used for?

Answer 20

• Delioberately spoil lift
• Disrupt smooth airflow
• Can also enhance roll