A fluid flowing around an object exerts a force on it. Lift is the component of this force that is perpendicular to the oncoming flow direction. It contrasts with the drag force, which is the component of the force parallel to the flow direction. Lift conventionally acts in an upward direction in order to counter the force of gravity, but it is defined to act perpendicular to the flow and therefore can act in any direction.
A wing is a type of fin that produces lift while moving through air or some other fluid. Accordingly, wings have streamlined cross-sections that are subject to aerodynamic forces and act as airfoils. A wing's aerodynamic efficiency is expressed as its lift-to-drag ratio. The lift a wing generates at a given speed and angle of attack can be one to two orders of magnitude greater than the total drag on the wing. A high lift-to-drag ratio requires a significantly smaller thrust to propel the wings through the air at sufficient lift.
A sabre is a type of backsword with a curved blade associated with the light cavalry of the early modern and Napoleonic periods. Originally associated with Central European cavalry such as the hussars, the sabre became widespread in Western Europe during the Thirty Years' War. Lighter sabres also became popular with infantry of the early 17th century. In the 19th century, models with less curving blades became common and were also used by heavy cavalry.
The koch was a special type of small one or two mast wooden sailing ships designed and used in Russia for transpolar voyages in ice conditions of the Arctic seas, popular among the Pomors.
The Holy Crown of Hungary, also known as the Crown of Saint Stephen, named in honour of Saint Stephen I of Hungary, was the coronation crown used by the Kingdom of Hungary for most of its existence; kings have been crowned with it since the twelfth century. The Crown symbolized the King's authority over the Lands of the Hungarian Crown, and it was a key mark of legitimacy. Through the history of Hungary, more than fifty kings were crowned with it, until 1916 and the last king Charles IV. The only kings not so crowned were Wladyslaw I, John Sigismund Zápolya, and Joseph II.
The Stahlhelm is a German military steel combat helmet intended to provide protection against shrapnels and fragments or shards of grenades. The term Stahlhelm refers both to a generic steel helmet and more specifically to the distinctive German military design.
The English language terminology used in the classification of swords is imprecise and has varied widely over time. There is no historical dictionary for the universal names, classification, or terminology of swords; a sword was simply a double-edged knife.
Szabla is the Polish word for sabre.
The eagle is used in heraldry as a charge, as a supporter, and as a crest. Heraldic eagles can be found throughout world history like in the Achaemenid Empire or in the present Republic of Indonesia. The European post-classical symbolism of the heraldic eagle is connected with the Roman Empire on one hand, and with Saint John the Evangelist on the other.
A flattop is a type of haircut where the hair on the top of the head is cut and styled upright to form a flat profile when viewed from the front or side.
Upper Hungary is the usual English translation of Felvidék, the Hungarian term for the area that was historically the northern part of the Kingdom of Hungary, now mostly present-day Slovakia. The region has also been called Felső-Magyarország.
The coat of arms of the Slovak Republic consists of a red (gules) shield, in early Gothic style, charged with a silver (argent) double cross standing on the middle peak of a dark blue mountain consisting of three peaks. Extremities of the cross are amplified, and its ends are concaved. The double cross is a symbol of its Christian faith and the hills represent three symbolic mountain ranges: Tatra, Fatra, and Matra.
Adverse yaw is the natural and undesirable tendency for an aircraft to yaw in the opposite direction of a roll. It is caused by the difference in lift and drag of each wing. The effect can be greatly minimized with ailerons deliberately designed to create drag when deflected upward and/or mechanisms which automatically apply some amount of coordinated rudder. As the major causes of adverse yaw vary with lift, any fixed-ratio mechanism will fail to fully solve the problem across all flight conditions and thus any manually operated aircraft will require some amount of rudder input from the pilot in order to maintain coordinated flight.
In British heraldry, vert is the tincture equivalent to green. It is one of the five dark tinctures called colours.
An arrow is a graphical symbol, such as ← or →, or a pictogram, used to point or indicate direction. In its simplest form, an arrow is a triangle, chevron, or concave kite, usually affixed to a line segment or rectangle, and in more complex forms a representation of an actual arrow. The direction indicated by an arrow is the one along the length of the line or rectangle toward the single pointed end.
Ráckeve is a town on Csepel Island in the county of Pest County, Hungary. Its residents are Magyars, with minority of Serbs.
The stern is the back or aft-most part of a ship or boat, technically defined as the area built up over the sternpost, extending upwards from the counter rail to the taffrail. The stern lies opposite the bow, the foremost part of a ship. Originally, the term only referred to the aft port section of the ship, but eventually came to refer to the entire back of a vessel. The stern end of a ship is indicated with a white navigation light at night.
The Handley Page Type G was a two-seat British biplane, designed by Handley Page that first flew in 1913. Only one was built.
The basket-hilted sword is a sword type of the early modern era characterised by a basket-shaped guard that protects the hand. The basket hilt is a development of the quillons added to swords' crossguards since the Late Middle Ages. In modern times, this variety of sword is also sometimes referred to as the broadsword.
The OId Jewish Cemetery is a cemetery in Sarajevo, Bosnia and Herzegovina. It is located on the slopes of Trebević mountain, in the Kovačići-Debelo Brdo area, in the south-western part of the city. It is the largest Jewish cemetery in Southeast Europe, and second largest sepulchral complex in Europe after the Old Jewish Cemetery in Prague. It was in use for approximately four hundred years from the beginning of the 16th or 17th century, but most likely from 1630 until 1966.
