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Results tagged with flight-controls
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user 21091
Use for cockpit controls (trim, yoke, etc). Use [control-surfaces] for the surfaces that actually move.
4
votes
What is the difference between reversible and irreversible controls?
Reversible means: at the flight controls, the aeroforces at the surface can be felt. The hinge moments exerted onto the control surfaces (ailerons, elevator, rudder) by the airflow are fed back (rever …
- 62.9k
0
votes
Is trimming aircraft to relieve pilot of applying force on control stick/Pedal still applica...
Yes, trim still exists, it's a really useful feature! Imagine flying from New York to London while gently pulling at the column for 6 hours in order for the aeroplane to maintain its flight path, that …
- 62.9k
5
votes
What is the rationale behind the Embraer 190's control column design?
The hand position when gripping the Embraer handle bar is the most natural ergonomical position. For instance as stated by this site:
The natural wrist position in the field of ergonomics is the p …
- 62.9k
12
votes
Accepted
What is the meaning and origin of the phrase “dead band” in relation to flight controls?
The dead-band in a flight control is a region of travel where stick movement does not result in control surface movement: a zone where stick input is dead.
With hydraulic power ON, moving the stick op …
- 62.9k
2
votes
What's a CWS button?
CWS is Control Wheel Steering, an early autopilot feature that senses if the pilot presses the flying control, and adjusts the target pitch as a result. Forces over a certain threshold activated the C …
- 62.9k
0
votes
What classes of aircraft require hydraulic flight controls?
There isn't a particular weight or size class for requiring hydraulic flight controls. The requirements are for control forces to stay within certain bounds, and in general this becomes more difficult …
- 62.9k
3
votes
Accepted
what is the mechanism of hydro-mechanical system in power control unit that uses follow up f...
There is a position control loop in there that opens the servo valve until the required position is reached, then closes it. The loop uses position of the actuator as a feedback signal, measured by a …
- 62.9k
0
votes
What is the difference between active and passive sidestick?
A passive sidestick only provides back pressure forces when it is deflected, by mechanical phenomina such as springs, dampers, and friction. It is passive in that it cannot be made to move other than …
- 62.9k
5
votes
What is the purpose of aileron droop used in some commercial airliners?
The purpose of aileron droop is to use the ailerons as wing flaps. Wing flaps increase the lift generated by the wings at low speed. They occupy a good part of the trailing edge of the wing, except fo …
- 62.9k
5
votes
Where do the forces exerted on flight yoke/stick comes from and how do they vary with flight...
I've worked with control loading systems quite a bit. What you describe is a reversible system, where the flight crew feels the aerodynamic forces acting on the primary control surfaces (elevator, ail …
- 62.9k
2
votes
How do airplane balance tabs (or control tabs) change the force on the pilot's controls?
PHAK chapter 6 shows a trim tab, and the linked discussion about Ameristar describes a servo tab. From this answer:
The servo tab is an aerodynamic lever, it is connected directly to the pilot flying …
- 62.9k
2
votes
Do helicopters need to use yaw pedals to fly a coordinated turn?
Fixed wing aircraft that deflect their ailerons experience adverse yaw: the aileron deflecting downwards experiences more drag than the one deflecting upwards, and this creates a yawing moment in the …
- 62.9k
0
votes
Accepted
How do I select an appropriate controller gain for this roll control autopilot?
You want fast response, but not any overshoot. The perfect response to a step input in this case would be a critically damped one. Matlab/Simulink are your friends here.
Things to consider in your fe …
- 62.9k
5
votes
Are there certification requirements on Dual Inputs?
Here's what EASA Certification Specifications for Large Aeroplanes CS-25 says about design for dual controls:
CS 25.399
Dual control system
(a) Each dual control system must be designed for …
- 62.9k
8
votes
Accepted
Do turnbuckles twist the flight control wires?
Yes the cables can be twisted if proper care is not administered during tightening. There are tools that allow for tightening the buckle while keeping both ends untwisted. From this article:
Cable …
- 62.9k