Slip (aerodynamics)

A slip is an aerodynamic state where an aircraft is moving somewhat sideways as well as forward relative to the oncoming airflow or relative wind. In other words, for a conventional aircraft, the nose will be pointing in the opposite direction to the bank of the wing(s). The aircraft is not in coordinated flight and therefore is flying inefficiently.

Background

Flying in a slip is aerodynamically inefficient, since the lift-to-drag ratio is reduced. More drag is at play consuming energy but not producing lift. Inexperienced or inattentive pilots will often enter slips unintentionally during turns by failing to coordinate the aircraft with the rudder. Airplanes can readily enter into a slip climbing out from take-off on a windy day. If left unchecked, climb performance will suffer. This is especially dangerous if there are nearby obstructions under the climb path and the aircraft is underpowered or heavily loaded.

A slip can also be a piloting maneuver where the pilot deliberately enters one type of slip or another. Slips are particularly useful in performing a short field landing over an obstacle (such as trees, or power lines), or to avoid an obstacle (such as a single tree on the extended centerline of the runway), and may be practiced as part of emergency landing procedures. These methods are also commonly employed when flying into farmstead or rough country airstrips where the landing strip is short. Pilots need to touch down with ample runway remaining to slow down and stop.

Aerodynamics

Aerodynamics, from Greek ἀήρ aer (air) + δυναμική (dynamics), is a branch of fluid dynamics concerned with studying the motion of air, particularly when it interacts with a solid object, such as an airplane wing. Aerodynamics is a sub-field of fluid dynamics and gas dynamics, and many aspects of aerodynamics theory are common to these fields. The term aerodynamics is often used synonymously with gas dynamics, with the difference being that "gas dynamics" applies to the study of the motion of all gases, not limited to air.

Formal aerodynamics study in the modern sense began in the eighteenth century, although observations of fundamental concepts such as aerodynamic drag have been recorded much earlier. Most of the early efforts in aerodynamics worked towards achieving heavier-than-air flight, which was first demonstrated by Wilbur and Orville Wright in 1903. Since then, the use of aerodynamics through mathematical analysis, empirical approximations, wind tunnel experimentation, and computer simulations has formed the scientific basis for ongoing developments in heavier-than-air flight and a number of other technologies. Recent work in aerodynamics has focused on issues related to compressible flow, turbulence, and boundary layers, and has become increasingly computational in nature.

Aerodynamic (disambiguation)

Aerodynamics is the science of the motion of air.

Aerodynamic may also refer to:

See also

Aerodynamic (instrumental)

"Aerodynamic" is an instrumental track by Daft Punk featuring a prominent guitar solo. The track was released on 28 March 2001 as the second single from the Discovery album.

Composition

Guy-Manuel de Homem-Christo once described the Discovery album as "A mix between the past and the future, maybe the present."Thomas Bangalter also elaborated in a 2001 interview that "A lot of house music today just uses samples from disco records of the '70s and '80s... While we might have some disco influences, we decided to go further and bring in all the elements of music that we liked as children, whether it's disco, electro, heavy metal, rock, or classical."

This is reflected in the structure of "Aerodynamic", which is said to build up a funk groove, halt for a solo consisting of "metallic, two-hand tapping on electric guitar", combining the two styles and ending with a separate "spacier" electronic segment. The solo elements were described playfully as "impossible, ridiculous Yngwie guitar arpeggios", which reflect the fast arpeggiation common with violin parts in classical music. Bangalter acknowledged that "Some people might think that the guitar solos on 'Aerodynamic' are in bad taste, but for us, it's all about being true to ourselves and not caring what other people would think. We really tried to include most of the things we liked as kids, and bring that sense of fun to it." He also commented that the end of the track "is completely baroque music, a classical composition we put into synthetic form."

Induction motor

An induction or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor therefore does not require mechanical commutation, separate-excitation or self-excitation for all or part of the energy transferred from stator to rotor, as in universal, DC and large synchronous motors. An induction motor's rotor can be either wound type or squirrel-cage type.

Three-phase squirrel-cage induction motors are widely used in industrial drives because they are rugged, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans. Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives (VFDs) in variable-speed service. VFDs offer especially important energy savings opportunities for existing and prospective induction motors in variable-torque centrifugal fan, pump and compressor load applications. Squirrel cage induction motors are very widely used in both fixed-speed and variable-frequency drive (VFD) applications. Variable voltage and variable frequency drives are also used in variable-speed service.

Slip (telecommunication)

In telecommunications, a slip is a positional displacement in a sequence of transmitted symbols that causes the loss or insertion of one or more symbols. Slips are usually caused by inadequate synchronization of the two clocks controlling the transmission or by poor reception of the signal.

References

Slip (album)

Slip is the debut studio album by American post-hardcore band Quicksand, released February 9, 1993 on the Polydor label. "Omission" and "Unfulfilled" first appeared on their 1990 self-titled EP. The album is included in Decibel magazine's Hall of Fame. Slip was well received by music critics and is now seen to be a classic in the post-hardcore and alternative metal genres and has influenced many bands

Track listing

Bonus track

Album credits