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In bracket drag racing and short track motor racing when a racer has a dial-in time / qualifying speed much slower than the car can actually perform. The term can also be used to describe a fast driver who holds back during a race until just before the end, when they suddenly pass up through the field to win the event.
Bullet parts: 1 metal jacket, 2 lead core, 3 steel penetrator. Terminal ballistics is a sub-field of ballistics concerned with the behavior and effects of a projectile when it hits and transfers its energy to a target. Bullet design (as well as the velocity of impact) largely determines the effectiveness of penetration. [1]
Sandbags can be used to build levees, barricades, dikes and berms to limit erosion from flooding. Sandbags can also be used to fortify existing flood control structures and limit the effects of sand boils. Sandbag structures do not prevent water seepage and therefore should be built with the central purpose of diverting flood water around or ...
Schlieren High-Speed Video Of Shotshell Transitional Intermediate Ballistics. Transitional ballistics, also known as intermediate ballistics, [1] is the study of a projectile's behavior from the time it leaves the muzzle until the pressure behind the projectile is equalized, so it lies between internal ballistics and external ballistics.
A bullet trap (or pellet trap when used specifically for air guns) is a device to stop and collect projectiles fired at a shooting range to prevent overpenetrations and stray shots. Bullet traps typically use friction , impact or gradual deceleration to stop bullets.
Ballistics can be studied using high-speed photography or high-speed cameras. A photo of a Smith & Wesson revolver firing, taken with an ultra high speed air-gap flash. Using this sub-microsecond flash, the bullet can be imaged without motion blur. Ballistics is often broken down into the following four categories: [23]
Nevertheless, there is significantly more to accuracy and cartridge lethality than the length and diameter of the case, and the 7.62×51mm NATO has a smaller case capacity than the .30-06 Springfield, [17] reducing the amount of propellant that can be used, directly reducing the bullet weight and muzzle velocity combination that contributes to ...
For projectiles in unpowered flight, its velocity is highest at leaving the muzzle and drops off steadily because of air resistance.Projectiles traveling less than the speed of sound (about 340 m/s (1,100 ft/s) in dry air at sea level) are subsonic, while those traveling faster are supersonic and thus can travel a substantial distance and even hit a target before a nearby observer hears the ...