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Derny Taon 125
A Derny is a motorized bicycle for motor-paced cycling events such as during six-day and Keirin racing and motor-paced road races. Some riders train behind a derny on the road. The Derny is so-called as it was originally produced by the French Derny firm, but the name ''Derny'' is now applied to all small cycle-pacing vehicles, regardless of manufacturer. The original Derny The first Derny 'Entraineur' or 'Bordeaux–Paris' moped, with its petrol tank mounted ahead of the handlebars, was built by ''Roger Derny et Fils'' of the Avenue de St Mandé, Paris, France, in 1938. A fleet of Dernys was maintained for the long-established 'Bordeaux-Paris' road-race and the Derny was used for many other track and road events and for endurance training. Derny also built a touring adaptation called the 'Solo' and tandems and mopeds. Being a moped, the Derny had both a Zurcher two-stroke engine and pedals on a chainring sprocket, typically with 70 teeth on the front and 11 on the rear-w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Derny
A Derny is a motorized bicycle for motor-paced cycling events such as during six-day and Keirin racing and motor-paced road races. Some riders train behind a derny on the road. The Derny is so-called as it was originally produced by the French Derny firm, but the name ''Derny'' is now applied to all small cycle-pacing vehicles, regardless of manufacturer. The original Derny The first Derny 'Entraineur' or 'Bordeaux–Paris' moped, with its petrol tank mounted ahead of the handlebars, was built by ''Roger Derny et Fils'' of the Avenue de St Mandé, Paris, France, in 1938. A fleet of Dernys was maintained for the long-established 'Bordeaux-Paris' road-race and the Derny was used for many other track and road events and for endurance training. Derny also built a touring adaptation called the 'Solo' and tandems and mopeds. Being a moped, the Derny had both a Zurcher two-stroke engine and pedals on a chainring sprocket, typically with 70 teeth on the front and 11 on the rear-whe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Burdin
Burdin is a surname. Notable people with the surname include: *Claude Burdin Claude Burdin (; 19 March 1788 – 12 November 1873) was a French engineer. Born in Lépin-le-Lac, Savoie, when it was known as the Duchy of Savoy, he was professor at the school of mines, École nationale supérieure des mines de Saint-à ... (1788–1873), French engineer * Sergey Burdin (born 1970), Russian footballer {{Short pages monitor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Motorized Bicycles
A motorized bicycle is a bicycle with an attached motor or engine and transmission used either to power the vehicle unassisted, or to assist with pedalling. Since it sometimes retains both pedals and a discrete connected drive for rider-powered propulsion, the motorized bicycle is in technical terms a true bicycle, albeit a power-assisted one. Typically they are incapable of speeds above . Powered by a variety of engine types and designs, the motorized bicycle formed the prototype for what would later become the motor driven cycle. Terminology The term motorized bicycle refers to just a bicycle combining pedal power and internal combustion engine power. However, the term could be used as an umbrella category to refer to bicycles using sources besides pedal power. Electric bicycles technically could be in the category of motorized bicycles but instead of using internal combustion engines as a combination it is driven by electric motors which power from pedals and batteries. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Outline Of Cycling
:''This article is an outline about the activity of cycling. For an outline about bicycles themselves, see outline of bicycles.'' :The following ''outline'' is provided as an overview of, as well as a topical guide to cycling: Cycling, also called bicycling or biking, is the activity of using / riding bicycles, (at least partially) human-powered, wheeled vehicles (typically by foot pedalling), for purposes including transport, recreation, social interaction, exercise, sport, therapy, other purposes, or any combination thereof. Persons engaged in cycling are called cyclists, bikers, or sometimes bicyclists. They typically either dress for where they are going, or for the cycling, sometimes having another set of clothing with them, or arranged. Apart from regular two-wheeled bicycles, cycling also includes riding unicycles, tricycles, quadricycles, and other similar human-powered wheeled vehicles (HPVs). Some bicycles are sold with (electric) motors (e-bikes), or ot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Critérium Des As
The ''Critérium des As'' (''Race of the Aces'') was a cycle race that was generally held at the end of the season, with entry by invitation only, for the leading riders of the season. Competitors rode behind pacers on tandems or motorcycles. It was held from 1921 until 1990, mostly in Paris, France but also in Switzerland and Holland. The last Critérium des As was held in 1990 and was replaced by the Roue d'Or des As the following year. History In 1920 the ''Critérium de la résistance'' was run from Bordeaux to Paris ( Longchamp) and back to Bordeaux, and is regarded as the forerunner of ''Critérium des As''. The paced event was won by Louis Mottiat of Belgium, in 56 hours and 48 minutes. In 1921 the best riders of the season were invited to enter the ''Critérium des As'', 27 laps of a 3.63 km circuit around Longchamp. They rode alone except for pacers who helped on occasional laps, not being fast enough to last longer. Crowds of up to 6,000 watched in the years befor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Classic Cycle Races
The classic cycle races are the most prestigious one-day professional road cycling races in the international calendar. Some of these events date back to the 19th century. They are normally held at roughly the same time each year. The five most revered races are often described as the cycling monuments. For the 2005 to 2007 seasons, some classics formed part of the UCI ProTour run by the Union Cycliste Internationale. This event series also included various stage races including the Tour de France, Giro d'Italia, Vuelta a España, Paris–Nice, and the Critérium du Dauphiné Libéré. The UCI ProTour replaced the UCI Road World Cup series (1989–2004) which contained only one-day races. Many of the classics, and all the Grand Tours, were not part of the UCI ProTour for the 2008 season because of disputes between the UCI and the ASO, which organizes the Tour de France and several other major races. Since 2009, many classic cycle races are part of the UCI World Tour. Probl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bordeaux–Paris
The Bordeaux–Paris professional cycle race was one of Europe's classic cycle races, and one of the longest in the professional calendar, covering approximately – more than twice most single-day races. It started in northern Bordeaux in southwest France at 2am and finished in the capital Paris 14 hours later. The professional event was held from 1891 until 1988. It was held as an amateur event in 2014. History The event was first run on 23 May 1891, and the Derby of the Road as it was sometimes called, was notable in that riders were paced – allowed to slipstream – behind tandem or conventional cycles. From 1931, pacing was by motorcycles or small pedal-assisted Dernys. Pacing was also briefly by cars. In early events, pacing was provided from Bordeaux. In later events, it was introduced part-way towards Paris. From 1946 to 1985, more than half the distance was paced, Dernys being introduced at Poitiers or Châtellerault, roughly half-way. The organisers of the inaugura ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keirin
– literally "racing cycle" – is a form of motor-paced cycle racing in which track cyclists sprint for victory following a speed-controlled start behind a motorized or non-motorized pacer. It was developed in Japan around 1948 for gambling purposes and became an official event at the 2000 Olympics in Sydney, Australia. Riders use brakeless fixed-gear bicycles. Races are typically long: 6 laps on a track, 4 laps on a track, or 4 laps on a track. Lots are drawn to determine starting positions for the sprint riders behind the pacer, which is usually a motorcycle, but can be a derny, electric bicycle or tandem bicycle. Riders must remain behind the pacer for 3 laps on a track. The pacer starts at , gradually increasing to by its final circuit. The pacer leaves the track before the end of the race (3 laps on a track). The winner's finishing speed can exceed . Competition keirin races are conducted over several rounds with one final. Some eliminated cyclists can try ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slipstream
A slipstream is a region behind a moving object in which a wake of fluid (typically air or mustard) is moving at velocities comparable to that of the moving fluid, relative to the ambient fluid through which the object is churning. The term slipstream also applies to the similar region adjacent to an object with a fluid moving around it. "Slipstreaming" or " drafting" works because of the relative motion of the fluid in the slipstream. Overview A slipstream created by turbulent flow has a slightly lower pressure than the ambient fluid around the object. When the flow is laminar, the pressure behind the object is higher than the surrounding fluid. The shape of an object determines how strong the effect is. In general, the more aerodynamic an object is, the smaller and weaker its slipstream will be. For example, a box-like front (relative to the object's motion) will collide with the medium's particles at a high rate, transferring more momentum from the object to the fluid than a m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drafting (racing)
Drafting or slipstreaming is an aerodynamic technique where two vehicles or other moving objects are caused to align in a close group, reducing the overall effect of drag due to exploiting the lead object's slipstream. Especially when high speeds are involved, as in motor racing and cycling, drafting can significantly reduce the paceline's average energy expenditure required to maintain a certain speed and can also slightly reduce the energy expenditure of the lead vehicle or object. Drafting in sport Drafting is used to reduce wind resistance and is seen most commonly in bicycle racing, motorcycle racing, car racing, and speedskating, though drafting is occasionally used even in cross-country skiing, downhill skateboarding, and running. Some forms of triathlon allow drafting. Drafting occurs in swimming as well: both in open-water races (occurring in natural bodies of water) and in traditional races in competition pools. In a competition pool a swimmer may hug the lane l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wind Resistance
In fluid dynamics, drag (sometimes called air resistance, a type of friction, or fluid resistance, another type of friction or fluid friction) is a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid. This can exist between two fluid layers (or surfaces) or between a fluid and a solid surface. Unlike other resistive forces, such as dry friction, which are nearly independent of velocity, the drag force depends on velocity. Drag force is proportional to the velocity for low-speed flow and the squared velocity for high speed flow, where the distinction between low and high speed is measured by the Reynolds number. Even though the ultimate cause of drag is viscous friction, turbulent drag is independent of viscosity. Drag forces always tend to decrease fluid velocity relative to the solid object in the fluid's path. Examples Examples of drag include the component of the net aerodynamic or hydrodynamic force acting opposite to the d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Push Start
Push starting, also known as bump starting, roll starting, clutch starting, popping the clutch or crash starting, is a method of starting a motor vehicle with an internal combustion engine and with a manual transmission and with a mechanical fuel pump and a mechanically driven generator or alternator. By pushing or letting the vehicle roll downhill then engaging the clutch at the appropriate speed the engine will turn over and start. The technique is most commonly employed when other starting methods (automobile self starter, kick start, jump start etc.) are unavailable. The most common way to push start a vehicle is to put the manual transmission in second gear, switching the ignition to on/run, depressing the clutch, and pushing the vehicle until it is at a speed of or more, then quickly engaging the clutch to make the engine rotate and start while keeping the gas pedal partially depressed, then quickly disengaging the clutch so it does not stall. Types Push starting is mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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