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Symmetrical aerofoils are, in general, less efficient and lack the lift provided by cambered wings at the zero angle of attack but are used in aerobatics, as they provide practical performance both upright and inverted.
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Symmetrical and are
Symmetrical differential signals exist to prevent interference with other circuits-the electromagnetic fields are canceled out by the equal and opposite currents.
Symmetrical Trefoils are particularly popular as warning symbols.
Symmetrical spinnakers are most efficient on runs and dead runs ( sailing with wind coming directly from behind ) while asymmetric spinnakers are very efficient in reaching ( the wind coming from the rear but at an angle to the boat or from the side ).
The Symmetrical Defense ( classified A30-39 in ECO ), which is 1 ... c5, and is so named because both of the c-pawns are advanced two squares, maintaining symmetry.
The ECO codes for the Four Knights Game are C49 ( the Symmetrical Variation, 4. Bb5 Bb4 ), C48 ( 4. Bb5 without 4 ... Bb4 ), and C47 ( alternatives to 4. Bb5 ).
Openings beginning with 1. e4 e5 are called Double King's Pawn Games ( or Openings ), Symmetrical King's Pawn Games ( or Openings ), or Open Games – these terms are equivalent.
Symmetrical acid anhydrides of this type are named by replacing the word acid in the name of the parent carboxylic acid by the word anhydride.
Symmetrical 1, 3, 5-triazines are prepared by trimerization of cyanogen chloride or cyanimide.
Symmetrical components are most commonly used for analysis of three-phase electrical power systems.
Symmetrical crystals are generally unstressed, unworked.
Symmetrical and less
Symmetrical IUGR is less common and is more worrisome.
Symmetrical growth restriction, less commonly known as global growth restriction, indicates that the fetus has developed slowly throughout the duration of the pregnancy and was thus affected from a very early stage.
Symmetrical and by
The first commercial implementation of a NUMA-based Unix system was the Symmetrical Multi Processing XPS-100 family of servers, designed by Dan Gielan of VAST Corporation for Honeywell Information Systems Italy.
Symmetrical hammering-which is almost always done by a machine-gives the cymbal a brighter sound.
Symmetrical pattern made by the denominators of the Farey sequence, F < sub > 8 </ sub >.
Note that Black can reach the Symmetrical Defense through many move orders by deferring ... c5, and often does.
Symmetrical tattoos of flowers and vines extend from her wrists to her biceps, done in 1991 by her former husband, British tattoo artist Alex Binnie.
Symmetrical and at
Symmetrical architecture on Jagati ( temple ) | jagati at Somanathapura
Symmetrical men and women have a tendency to begin to have sexual intercourse at an earlier age, to have more sexual partners, to engage in a wider variety of sexual activities, and to have more one-night stands.
Symmetrical and .
Symmetrical examples include diphenylacetylene and 3-hexyne.
File: Minerva-21. jpg | Symmetrical gloves of a Birman, colour blue-point
* Symmetrical circe: as circe but the rebirth square is the capture square mirrored across the center of the board.
* Symmetrical scenes: Old Comedy is full of scenes in which two sections resemble each other in meter and length.
Symmetrical dimethylhydrazine ( CH < sub > 3 </ sub > NHNH ( CH < sub > 3 </ sub >)) is also known but is not as useful.
* Tsien, HS 1943 Symmetrical Joukowsky Airfoils in shear flow.
* The Symmetrical Defense is very rarely played.
If Black does not wish to play the Queen's Indian in response to 3. Nf3, alternatives include: 3 ... d5, transposing to the Queen's Gambit Declined ; 3 ... Bb4 +, the Bogo-Indian Defense ; and 3 ... c5, which typically leads to a Modern Benoni or a Symmetrical English.
For example, 1. c4 Nf6 2. Nc3 ( or 2. Nf3 ) c5 is a Symmetrical Defense even though Black played ... c5 on move two.
* 1 ... c5 ( the Symmetrical Variation ) including attempts to try the Hedgehog system.
However, more than half the time after playing this first move, Black subsequently elects to transpose into either a Symmetrical Defense with ... c5, or a Reversed Sicilian with ... e5.
This can lead to Nimzo-Indian, Classical ( E32 ), Symmetrical Variation ( A30 ), or D35 or D37 of the Queen's Gambit Declined.
Then Black may play 2 ... Nf6 for Symmetrical Variation ( A30, see 1. Nf3 c5 2. c4 Nf6 ).
aerofoils and are
Its surfaces therefore are symmetrical and not uneven like the aerofoils which give the returning boomerang its characteristic curved flight.
This includes cordage ( ropes attached to the spars and sails in order to manipulate their position and shape ), sails ( aerofoils, usually made of fabric, used to catch the wind ), and spars ( masts and other solid objects sails are attached to ).
Sails are fabric aerofoils designed to catch the wind and manipulate the air currents surrounding the vessel.
Applications of potential flow are for instance: the outer flow field for aerofoils, water waves, electroosmotic flow, and groundwater flow.
Because of this, structures exposed to aerodynamic forces — including wings and aerofoils, but also chimneys and bridges — are designed carefully within known parameters to avoid flutter.
The calculations that purported to show that bumblebees cannot fly are based upon a simplified linear treatment of oscillating aerofoils.
In the original versions of the Darrieus design, the aerofoils are arranged so that they are symmetrical and have zero rigging angle, that is, the angle that the aerofoils are set relative to the structure on which they are mounted.
When the Darrieus rotor is spinning, the aerofoils are moving forward through the air in a circular path.
Like most open-wheel cars they feature large front and rear aerofoils, but they are far more developed than American open-wheel racers, which depend more on suspension tuning ; for instance, the nose is raised above the centre of the front aerofoil, allowing its entire width to provide downforce.
Dual voltage units are fitted with a Brecknell Willis high speed pantograph, which incorporates a pair of aerofoils on the pan knuckle to steady the pan head against the OLE contact wire.
During atmospheric ingress or egress, two remotely-controlled " lifting bodies " ( self-propelled " flying wing " aerofoils ) are attached to the main body at the front and rear of the craft.
In many cases however, the compressor aerofoils are critically loaded without capacity to absorb the disturbance to normal airflow such that the original stall cells affect neighbouring regions and the stalled region rapidly grows to become a complete compressor stall.
Compressor stalls are aerodynamic stalls in which the aerofoils in the compressor are loaded above their lifting capability.
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