Ch 18 - Control

Question 1

Principle of Operation

Answer 1

Local camber changing devices

Usually located on extremities

Question 2

Aileron

Answer 2

Rate control - bigger movement of controls = faster rot

Does not change direction

Question 3

Rudder

Answer 3

Displacement control - displaces aircraft from original flight path

Question 4

Elevator

Answer 4

Displacement control - changes direction of aircraft

Question 5

Hinge Moments

Answer 5

The more aerodynamic force generated from surface = the more you feel it in the controls

Question 6

Aerodynamic Balance: The Inset Hinge

Answer 6

The hinge is inset up to 25% along the control surface so the force required to move it decreases

Question 7

Aerodynamic Balance: Horn Balance

Answer 7

A section on the surface forward of the hinge line

Air gets caught under the front bit assisting in deflecting the surface

Question 8

Aerodynamic Balance: The Internal Balance

Answer 8

A small diaphragm between the surface and main surface which is surrounded by q + p

Aileron still wants to get back to original position

Flexible diaphragm (rubber) resists motion basically

Question 9

Aerodynamic Balance: Balance Tab

Answer 9

Makes controls lighter

Deflects in opposite direction to the surface (which balances it out)

These are inefficient (drag) and you lose a bit of control effectiveness

Question 10

Aerodynamic Balance: The Anti Balance Tab

Answer 10

Makes controls heavier

Question 11

Aerodynamic Balance: The Servo-Tab

Answer 11

Makes the controls much lighter

Moves the tab first and then the controls

Question 12

Aerodynamic Balance: Spring Tab

Answer 12

Acts like a servo - tab at high speed (both move, tab first)

Acts like a balance tab at slow speed