Chapter 18 - Control Flashcards
Basic requirements are
Forces?
Feel?
Responsive?
Movement and Harmony?
The forces on the controls must not be too heavy or light.
You must be able to sense airspeed through the controls- must be proportional to aerodynamic force.
No delay in response
Controls must not require excessive small or large input, fwd + aft, should be the same as left + right to harmonise.
Aileron is changing the aerodynamic force which is a what control?
rate
Rudder and elevator are a deflection effect which is a what control
displacement ( which changes the direction of the total reaction)
Hinge moments give us feel how
aerodynamic force x distance
Which aerodynamic balance gives a heavier feel
Anti balance tab
What does inset hinge do?
reduces the moment by reducing the distance. Max 25%
Horn balance does what?
Add area to the control surface in front of the hinge line
Trim Tab
Holds the control surface in the desired position by deflecting the opposite way
Internal Balance
Uses differential pressures to reduce forces
Balance Tab
Pilot moves the control surface - the balance tab then moves in the opposite direction to help reduce the forces
Servo tab
Pilot deflects the servo tab, not very good at low speeds and loses control authority
The spring tab
At low speeds = balance tab
At high speeds = Servo tab
Mass balance is for what and is put where
To stop flutter and in front of the hinge line
Power assisted controls have natural feedback?
Yes
Aerodynamic dampering is a resistance to roll why?
Because the down going wing will have an increased AOA
