Slingshot

For the acceleration of a spacecraft by passing by heavenly bodies, See gravitational slingshot

Image:Slingshot (weapon).jpg A slingshot, also called a shanghai or a catapult (not to be confused with either the catapult siege engine or shepherd's sling) is a small hand-powered projectile weapon. It has a pocket for holding the projectile. Each end of the pocket is attached to a rubber band, which is attached to the ends of a fork-shaped frame.

There are several shooting styles, but the most common is to hold the slingshot horizontally and aim with the upper fork end. The pouch must be pulled back to the cheek, and is to be released while breathing out. When one releases the pocket, the stretched rubber bands accelerate the pocket, and projectile.

A related technique is to aim by aligning the elastic bands with the target.

A slingshot champion appearing on the David Letterman Show some years ago said to hold the projectile pocket at a fixed position near the body, such as the hip, and move the frame based on gut feeling and practice, just like a gunslinger or hip-shooter in the American wild west. Many gunslingers could hit a target without raising their weapon to eye level.

A slingshot can be powerful enough to hunt small game. In order to achieve power, one has to use the correct ammo; steel balls are the most common choice. A typical heavy pull band slingshot should be used with 3/8" to 1/2" steel balls. Using lighter ammo does increase speed insignificantly, as the mass of bands and pouch always add to the projectile mass.

With practice, slingshots are effective against small rodents and songbirds at ranges up to 25 metres. They are excellent for hunting rats and pigeons. Because of the low ammunition cost (pebbles work) and ease of use, slingshots are very popular with children.

The weak hand holding the frame becomes fatigued by doing so. Many slingshots have a wrist-brace so the user's weak hand doesn't have to hold the frame very tightly. Some models come along with stabilizers, rotating prongs, sighting mechanisms and other sophisticated improvements. While these are not necessary, they usually add to power, lifespan of the bands and accuracy.

The material for the rubbers is critical. The best widely-available material is dipped latex rubber surgical tubing or latex sheeting. It lasts about six months before it needs to be replaced. It can be attached to the frame and packet by stretching it over a metal rod of the correct diameter. Some slingshots have been constructed of metal tubing of the exact diameter. Rubbers should be stored under water away from sunlight to protect them from the air's ozone, which causes them to stiffen and crack.

The weight of the pocket is critical, because if the pocket is very heavy, the slingshot will be weak. The best pockets are made of soft leather, which does not fray.

Securely attaching a pocket at home can be quite difficult. An effective way is to drill a short section of hardwood dowel lengthwise, and place the pocket in a cotter pin. Next, insert the pin into the dowel, and wrap the ends of the pin completely around the dowel. Finally, stretch the rubber over the dowel and pin-ends. Never reuse a cotter pin.

The slingshot is not related to the sling. Mechanically it operates on a different principle. Operation is different, as well.

Today, slingshots are used at paintball games as backup or silent sniper weapon. On some playfields they are even banned for sending the paint bullet faster than the allowed 300 feet/second (100 m/s), which is considered an unsafe and unfair advantage. Source - newsgroup rec.sport.paintball .da:Slangebøsse de:Catchie es:Honda (arma) fr:Lance-pierre ja:投石器 ku:Neçik pl:Proca katapulta pt:Bodoque