## What is air gun?

An airgun is a type of gun which propels projectile by means of mechanically pressurised air or other gases without involving any chemical reaction. Since first airgun is made in 1500s. Speciality of air gun is we can use pellets spherical or any type of materials as bullet.

We have made airgun with some cool feature . Our airgun is more powerful when compared with others.

We have named our airgun as "Cheri froura" .

Why we named cheri froura?

The name Cheri froura is derived from the Greek word in which Cheri mean guard and froura means hand .

Since we may be the very first person to do air gun mounting over wrist.
Normally a wrist gun may travel for a distance of  30 feet but our Cheri froura  can travel for a distance of 42 feet approximately .

Materials used​ in Cheri froura:
Half inch pvc pipe, one inch pvc pipe,mtp (one inch to half inch ) 2 nos, half inch gate valve, bike valve tube, pvc gum, araldite and m-seal as required, sheet metal, tube.

Originally called CG guns (compressed gas guns), air guns utilizing prefilled removable gas cylinders as power source have now become known as CO2 guns due to the ubiquitous commercial use of bottled carbon dioxide gas. Most CO2 guns use a disposable cylinder called a "Powerlet", that is often purchased with 12 grams (0.42 oz) of pressurized CO2 gas, although some, usually more expensive models, use larger refillable CO2 reservoirs like those typically used with paintball markers.

## Calibers (bullet) :

The most common air gun calibers are

• .177 (4.5 mm): the most common caliber. Mandated by the ISSF for use in international target shooting competition at 10m, up to Olympic level in both rifle and pistol events. It has also been adopted by most National Governing Bodies for domestic use in similar target shooting events. It has the flattest trajectory of all the calibers for a given energy level, making accuracy simpler. At suitable energy levels it can be used effectively for hunting.
• .22 (5.5 mm & 5.6 mm): for hunting and general use. In recent years air rifles and pistols in .22" (and some other calibers) have been allowed for use in both domestic and international target shooting in events not controlled by the ISSF. Most notably in FT/HFT and Smallbore Benchrest competitions. These events often allow the use of any caliber air gun, up to a maximum which is often .22", rather than a fixed caliber.
• .20 (5 mm): initially proprietary to the Sheridan multi-pump pneumatic air rifle, later more widely used.
• .25 (6.35 mm): the largest commonly available caliber for most of the 20th century.
• .357
• .45 (11.43 mm)
• .50 (12.7 mm)
• .58 (14.5 mm)

Other less common traditional calibers include:
Larger caliber air rifles suitable for hunting large animals are offered by major manufacturers. These are usually PCP guns. The major calibers available are:
Custom air guns are available in even larger calibers such as 20 mm (0.79") or .87 (22.1 mm)

Law for air gun calculation

While in some countries air guns are not subject to any specific regulation, in most there are laws, which differ widely. Each jurisdiction has its own definition of an air gun; and regulations may vary for weapons of different bore, muzzle energy or velocity, or material of ammunition, with guns designed to fire metal pellets often more tightly controlled than airsoft weapons. There may be minimum ages for possession, and sales of both air guns and ammunition may be restricted. Some areas require permits and background checks similar to those required for firearms proper.

## Formula for calculating air gun velocity

It is very simple you can calculate the velocity of caliber from below formula

The general formula for the kinetic energy is
${\displaystyle E_{k}={\begin{matrix}{\frac {1}{2}}\end{matrix}}mv^{2}}$

Muzzle energy is the kinetic energy of a bullet as it is expelled from the muzzle of a firearm. It is often used as a rough indication of the destructive potential of a given firearm or load. The heavier the bullet and especially the faster it moves, the higher its muzzle energy and the more damage it will do.

1. Low production cost .
2. It can be use for self defence.
3. It can be operated at any temperature.
4. It can be used in various purpose  such as hill climbing ,.

Thus comment below if you have any doubt in doing this,.
for abstract and calculation contact me in comment,.

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