Stability Concepts
The aircraft's response to momentary disturbance is associated with its
inherent degree of stability built in by the designer, in each of the three axes,
and occurring without any reaction from the pilot.
Stability: A system is stable when it comes back to its original state after it was submitted to an external disturbance. The classic example is a ball in a bowl (see Figure 1).
Dynamic stability
Tags: FAA Pilot's Handbook
Dynamic stability. The property of an aircraft that causes it, when disturbed from straight-and-level flight, to develop forces or moments that restore the original condition of straight and level.
Stability has to do with how the system responds if we move it a little ways from its equilibrium position. There are three possibilities: ...
Seckel : Stability and Control of Airplanes and Helicopters.
4.
Babister : Stability and Control.
Stability
The tendency of an aeroplane to return to level flight, after having been disturbed by an upsetting force.
Stall ...
Stability
The property of an air mass to resist vertical displacement from its initial position. If an air mass is stable, then an outside force is required to raise it for cloud formation.
Stability: Stability is the property possessed by aircraft (aerostat or aerodyne) in more or less degree which enables it to return to normal conditions of flight automatically after a disturbance of its course.
Stability coordinates.
Coordinates referenced to the air mass; Compare: body coordinates, earth coordinates; ...
[edit] Stability
Will a kite return to a designed or desired flight mode or position after being disturbed by a gust or kite operator control action? How large of a gust can be tolerated?
lateral stability
Stability about an airplane's longitudinal (nose to tail) axis
lift
Force created by an airfoil moving through atmosphere, perpendicular to the direction of motion ...
Stability of an aircraft may be judged by how well it holds a trimmed situation.
Static stability exists when an aircraft is trimmed for a condition and then moved will return as trimmed.
A statically stable aircraft is easier to fly.
The stability of a hovercraft is dependent upon the pitch (fore and aft) and roll (side to side) stiffness of the air cushion. This stiffness is derived from two main sources: ...
Lateral Stability.-This depends upon the keel surface or total side area of an airplane. The keel surface includes all the struts, wires, wheels, wings, as well as body, against which a side wind can blow.
SAS - stability augmentation system. An automatic flight control system employed in many helicopters and some fixed-wing aircraft to enhance their stability and handling qualities.
In flight, stability is the Warrior's strong suit. Wing dihedral contributes to good roll stability, and the stabilator can be trimmed for hands-off level flight, even in turns.
Stability of a Model Rocket A model rocket relies on aerodynamics to provide stability during flight.
Flight of a Model Rocket The flight of a model rocket depends on the relative size of the forces on the rocket. ^M ...
Stability and Control Stability and Control is the study of how to control the speed, direction, altitude and other conditions that affect how a plane flies Shock Wave A series of air waves that form in front of a fast moving plane.
The airplane levitates with the stability of an elevator, and you can plan on reaching typical cruise heights of 6,000 to 7,000 feet in 15 to 20 minutes.
This is a direct result of not having positive dynamic stability: the helicopter won't just sit there if you don't move the controls. Instead, constant control input is required in order to maintain a constant position and height above the ground.
By the middle of 1809, Cayley had investigated the improved lifting capacities of cambered wings, the movement of the centre of pressure, longitudinal stability, and the concept of streamlining.
The plane had overall ruggedness and stability, and pilots say it flew like a truck, for better or worse.
NOTE: After practicing stalls until they become comfortable for the student, I then like to demonstrate the positive stability of the airplane to all students. This really helps students understand that the airplane will not "fall" out of the sky.
As thunderstorms belong to the cumulative cloud family, their development is based on processes which will cause an air mass to rise. That will happen by either instability or by an upward force along some frontal system in a convergence zone, ...
Stabilizer A surface which increases the stability of a model. Most aircraft have two stabilizers, the horizontal (stab) and vertical (fin), which are mounted on the tail.
Static longitudinal stability. The aerodynamic pitching moments required to return the aircraft to the equilibrium angle of attack.
FIN - A fixed vertical aerofoil surface, usually a dorsal component of the tail unit, to provide stability in yaw.
FIRING - An addition to an aircraft's basic structure which is intended primarily to reduce drag.
SPONSON - A short, winglike protuberance on each side of a seaplane to increase lateral stability.
SQUAWK - A four-digit number which is dialed into his transponder by a pilot to identify his aircraft to air traffic controllers ...
While it's maybe not the most aesthetically pleasing, the square fuselage is very simple to build and helps to provide good yaw stability and spin dampening (resistance) due to its flat sides and distinct corners.
CABIN / VISIBILITY ...
Stabilizer: A control surface, usually mounted at aft end of the fuselage parallel to the wings, that provides pitch stability, some aircraft have an adjustable stabilizer.
STABILATOR - A movable horizontal tail that combines the actions of a stabilizer and elevator, increasing longitudinal stability while creating a pitching moment.
machine was killed on a glider flight in October 1899. This convinced the Wright brothers to concentrate on building kites controlled from the ground. These kites had controls for warping the wings to achieve control of direction and stability.
30 seconds, but he managed to remain awake by sticking his head out of the window to inhale cold air, by holding his eyelids open, and by constantly reminding himself that if he fell asleep he would perish. In addition, he had a slight instability ...
Flaps also are commonly deployed during final approach to increase lift, which provides control and stability at slower speeds.
Single float designs are often advantageous to floatplanes as they are able to handle rough seas due to the variety of large and small floats on the aircraft which provides good lateral stability during landing in rough seas.
The location of the center of pressure with respect to Center of Gravity is an important factor in airplane stability. The effect of the locations of the center of pressure and of the center of gravity will be discussed later.
also sitting down, strapped in by a seatbelt, feels his feet firmly planted on a solid surface (the rudders, hopefully) and is looking through a force field (Plexiglass). All of these conspire to provide the pilot with a sense of physical stability ...
This led to an increase in weight and adversely affected the plane's performance: it now suffered from instability and was difficult to handle.
 See also: Flight, Plane, Speed, Aircraft, Wing
  
|
RSS
