Showing posts with label Energy. Show all posts
Showing posts with label Energy. Show all posts

Friday, 10 June 2011

Types of Bullets

The bullet is a piece of ammunition that is shot using a gun, pistol or rifle. The invention of bullets revolutionized warfare. Today, bullets are available in a wide range of shapes and sizes, depending on what purposes they are designed for. Bullets are made of different materials such as lead, jacketed lead (lead coated with steel or copper alloys), copper, steel and even bismuth and tungsten. A bullet has three parts: the tip or head, the ogive or body and the heel or base. Read ahead to know which are the different bullet types.

Different Types of Bullets

Bullets can be classified on the basis of their shapes, construction and the purpose for which they are used. Here you'll find a list of bullets under each category, along with a brief description of each.

Bullet Types Based On Construction
Construction refers to how the bullet is designed to behave after hitting the target. Bullets can be frangible, non-expanding or expanding.

Frangible Bullets
These bullets break into a number of small pieces on hitting the target. They do not pierce deep into the target and cause damage close to the surface. Used for shooting small animals.

Non-Expanding Bullets
These types of bullets neither break into pieces nor expand, on impact. Non-expanding bullets pierce the target and pass through the target, failing to kill it immediately. It is for this reason that non-expanding bullets are banned for use in hunting medium for large sized animals in the U.S.

Expanding Bullets
These bullets expand on hitting the target and come in wide varieties. These bullets are used for hunting large animals, as they cause immediate death of the animal. The purpose of using these bullets is to kill the animal as soon as possible by causing damage to organs such as the heart.

Bullet Types Based on Purpose
Bullets come in different shapes and sizes and each one is used for a different purpose. Let's have a look at the different purposes bullets are used for.

Target Bullets
Target bullets are meant to be used for shooting targets from a greater distance, due to which these bullets are designed such that they have a high level of accuracy. Due to this reason, close attention is paid to the weight and dimensional tolerances of these bullets. These bullets come in different shapes and with different tips. These are generally high velocity bullets that are fired at speeds that are anywhere around 2500 to 3500 feet per second. Some examples are Lapua Scenar and Hornady A-max. There are no legal restrictions on the purchase of these bullets.

Varmint Bullets
The purpose of these bullets is to shoot small game animals such as rabbits or small species of birds such as crows. These expanding bullets are so designed that they split into two on hitting the target. One needs special permission to purchase these bullets due to legal restrictions imposed on their purchase. Some examples of varmint bullets are Hornady V-max and 0.204 Ruger. These bullets are fired with velocities that reach around 3000-4000 feet per second.

Hunting Bullets
Like the varmint bullets, these bullets are also meant for hunting smaller animals like wild goats. However, these differ from the varmint bullets in the fact that these are designed to expand on hitting the target or game. This effect is termed as 'mushrooming'. It is also illegal to purchase these bullets without special permission. These bullets may be round or pointed in shape and their property of expanding on hitting leads to immediate death of the animal. These bullets can be fired at velocities ranging from 2000 feet to 3000 feet per second.

Premium Bullets
The purpose of these bullets is to shoot larger game animals and are similar to hunting bullets in all but one aspect: a thicker copper jacket and an additional solid section. These additional features ensure that the premium bullets don't split into pieces even after hitting hard targets. Classified under expanding bullets, it is illegal to purchase these bullets without a proper license. Nosler Partition is an example of premium bullets that are designed to hit the target with a velocity of 2000-3000 feet per second.

The GROM Bullet
Another type of expanding bullet, the GROM bullet is a product of the Serbian ammunition company Prvi Partizan. The unique feature of this bullet is its core made of soft lead, the shape of which gets altered on hitting the target causing the surrounding copper jacket to spread like flower petals. The velocity of the GROM bullet is anything between 2000-3000 feet per second. The purchase of these bullets are restricted.

The Naturalis Bullet
The problem with lead bullets such as the GROM bullet is that lead is a toxic metal and the residual lead from these bullets would adversely affect the environment in the long run. Thus came the need for bullets that did not have lead in them. This problem was solved by the Naturalis bullet that came with a polymer tip and was developed by the Finnish company Lapua. The velocity of the Naturalis bullet is anything between 2000 to 3000 feet. The purchase of the bullets are restricted.

Full Metal Jacket Bullets
Full metal jacket bullets are not suitable for shooting game. These bullets are used for loading military rifles and are the type of bullets allowed to be used during warfare where the use of expanding bullets is strictly prohibited. There are no restrictions on the purchase of these bullets.

Bullet Types Based on Shape
Now, finally let's have a look at the different shapes of bullets commonly used.

Flat Point Bullets
These bullets have a flat nose which means more lead exposed at the tip, which ensures better expansion.

Round Nose Bullets
These bullets have a round shaped nose that is blunt. These bullets are more inclined to travel in a straight line.

Spitzer Bullets
These bullets are characterized by a pointed nose and a flat base, which reduces air drag, thus increasing the velocity of the bullet. However, such a design is not suitable for expanding bullets.

Boat-tail Spitzer Bullets
The characteristic feature of these bullets are the pointed tip and the tapered base. The streamlined shape reduces air drag and makes these bullets the best choice for long range shooting.

This was a brief description of the various kinds of bullets. The types of bullets also vary with the type of gun used. So, there are different bullets for handguns, machine guns, rifles, pistols and revolvers. Thus, in order to choose a bullet, one should also have a prior idea of the type of gun to be used and its range. Choosing the wrong bullet might defeat the purpose of using the gun in the first place!

How to Use Solar Energy to Generate Electricity

As the technology for solar cells gets better and better, this form of clean, renewable energy will find more applications that take up less space and produce more electricity, to meet the energy needs of our homes, schools and businesses.
~ Samuel Bodman

Isn't it wonderful to have a power source so unlimitedly vast and reliably consistent as the sun at our immediate disposal? It's a different thing altogether that till now, not many of us have paid any amount of serious attention to the possibility of converting all that unlimited heat and radiance into electricity for everyday use to run regular applications and appliances. However, with the threat of environmental pollution and dwindling fossil fuel reserves breathing down its neck, humanity has finally come to terms with the idea of exploring alternative energy sources to generate fuel as well as power for its mundane domestic as well as industrial and commercial needs. After wind and water, lots of countries and regions all over the world are gradually turning to solar power for fulfilling their electricity needs. You see, compared to wind and water force, which tend to be influenced by seasons and other climatic factors, solar energy is more constantly and consistently available. Now, if you're wondering how to use solar energy to generate electricity, ski through the next segment without missing a single turn to get to the details!

How do We Use Solar Energy to Generate Electricity?

The heat and radiance of the sun can be harnessed and converted to electricity for human uses in two major ways - via photovoltaic systems or with the help of concentrated solar thermal systems. Photovoltaic method using solar panels and semiconductors is the easiest and most widely used method of harnessing solar energy to generate electricity for homes and small to medium sized industrial and commercial establishments. The following points lay down the basic guidelines regarding how to generate electricity from solar energy using solar panels:-

☀     In order to be able to generate electricity from solar energy, you will need a solar power plant generator. You can either buy a ready-made one, or make one yourself. However, the commercially available ones are likely to burn a hole in your pocket so it's better to build a power plant generator yourself.
☀     To assemble a solar power plant generator yourself, you will need photograph voltaic cells or solar cells, which you can easily get from online stores such as eBay. Apart from the solar cells (number of cells depending upon how much power you wish to generate), you'll need a wooden frame of a size that will perfectly accommodate a lateral solar panel matrix and a glass sheet to cover the wooden frame.
☀     Connect the solar cells adjacent to each other in such a way that the final result looks like a flat sheet of connected solar cells. Follow the wiring instructions that came with the cells and fit these connected cells inside the wooden frame. Cover the surface with the sheet of glass.
☀     Build a battery bank using rechargeable batteries and connect it to your solar power panel. The solar cells will absorb all the solar energy they can and this energy will be routed to the battery bank, which will, in turn, pass the DC power through a circuit, which is what a power inverter would be needed for.
☀     Connect the battery output to the power inverter input point. Connect the inverter output to the input point of your home's residence's wiring system. Once the DC charge passes through the power inverter, it gets converted to an AC charge and the voltage is also adjusted to suit your power requirements. There! Your very own solar power plant generator is ready for domestic use!

So, you see, even if your local county hasn't become solar-power-savvy yet, you yourself can go ahead and make a difference to your individual residential unit by installing a self made solar power plant at your own place! You'll be delighted by how surprisingly less electricity will cost if you generate it by harnessing solar energy. Now that you know how to use solar energy to generate electricity yourself, go ahead and let your inner engineer out - trust me, your individual initiative will inspire many others around you go solar and eventually, it will dawn upon the power industry to run things sunny side up!