Hard Top Racing [oo]

Racing events include playing exclusively on closed tracks, yards and roads. In racing drivers only compete, and used cars need not meet the conditions for the road traffic.

Due to the location and method of competition, racing is divided into two categories:

1. Racing track
   Track racing takes place on closed tracks between at least two cars that compete simultaneously on the same route. The classification is the order of crossing the finish line or defeat at the appointed time as many laps of the track.
2. Racing in parallel
   Racing in parallel (called drag racing) will take place on two parallel straight roads, located mostly in the squares, airports or racetracks, with a length of 1/4 mile (402.336 meters) or less 1/8 mile (201.168 meters). The competition involved two players simultaneously, but about the sequence determines the winner crossing the finish line or travel time.

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The first documented race occurred in 1887 in Paris. But it turned out to be a total fiasco, because at the start came only one player. The race was to demonstrate the possibility of a disposal of a new vehicle.
The first successful race was counting the 126 km race Paris – Rouen.

He won the Count Albert de Dion, but no prize was awarded to him because his vehicle was driven by a steam engine … The rivalry between these art as the vehicle for the times, began to enjoy increasing success. Cars were becoming faster and for the success of the driver corresponds to an increasing number of people.

Racing evolved. Today, we can extract many kinds of discipline, but the basic distinction between car rallies and races. The main difference is that the rallies are held on the ground, on closed public roads of various types of surface (asphalt, snow, gravel). Each race is divided into stages (OS-es), which is measured travel time of each vehicle. The crew vehicle are two people: a driver and pilot. The most famous races should the World Rally Championship (WRC), which is the World Rally Championship.

The term “sound barrier” in the notebook was a journalist, who at the time of the interview in the 40s Twentieth century British aviation engineer WF Hilton showed a graph showing a strong peak drag coefficient Cx, which meets the plane in terms of speed near the speed of sound. Since then, through the action of the imagination, this phrase exists in many languages. However, outside such a graph no barrier, with a roar that can be “overcome”, does not physically exist.

Hornet - speed in the sky

In the above image F/A-18 Hornet does not exceed the speed of sound, but flies at a speed slightly less. The air flowing plane has in many places the aircraft speed greater than the speed of the airplane relative to undisturbed air, then the velocity decreases. As the plane speeds up and reaches the so-called critical Mach number, in some places, flow around its speed exceeds the local speed of sound.

Increasing speed and reducing the flow around the pressure is running smoothly and without loss, while reducing the velocity jump is only possible on the area known as the shock wave, where there is a discontinuity (decrease) in velocity, pressure and temperature increase. The creation of shock waves involves an additional wave resistance and – disturbing the flow round the wave – additional resistance profiled.