Pages: 1 2

The physics behind a parachute is easy to understand. But making real ones are far from easy. Making toy parachutes seem like a good idea for an easy science project but experimenting with different variations is not as easy as tying strings to a fabric. Making parachutes for use in real life takes a lot of risk and accuracy.

Before modern parachutes gave us the thrill of skydiving it took a lot of guts for early investors to design parachutes that actually work and not fall them to their death. The history of parachutes went through a lot of development and a few deaths.

The modern parachute was invented by Louis-Sébastien Lenormand in 1783. However there are earlier versions of parachutes created by a few centuries earlier. Before the silk parachute was invented, there were basic designs built that worked in the same principles.

Parachutes, past and present

The earliest form was a cloak attached to wooden struts. It was made by an Arab Muslim named Arem Firman in the 9th century. He jumped from a tower in Cordoba and suffered only minor injuries. Parasols were used in China for entertainment. It allows entertainers to jump form high places and float to the ground.

Leonardo da Vinci also sketched parachute with conical designs. It served as an escape device to enable people to jump from burning buildings. In 1617 Faust Vrancic was the first person to be able to make a successful jump with a parachute.

Jean Pierre Blanchard developed his own parachute as a means to get off a hot air balloon. His first demonstrations were done with a dog as the passenger. He later on unintentionally put his invention to the test as he escaped from his ruptured hot air balloon.

In the 1790′s he made a parachute out of silk which were more stringer and lighter than previously used materials. Early parachutes were made of linen with a wooden frame.

Andre Garnerin invented the vented parachute in 1797 and made a successful jump using Blanchard’s design. The vented parachute improved stability during descent. Gleb Kotelnikov invented he knapsack parachute. It was popularized by Katchlen Paulus and Paul Letterman.

The first major use of parachutes was in the military. It was by artillery spotters and pilots. Unfortunately the parachutes were heavy and pilots were not able to use it entirely. The German Air Service provided parachutes to their pilots. Unfortunately there were many setbacks that most of the pilots died when using them.

Leslie Irvin was able to invent

Recent visits to the site (search terms):

• history of Parachutes for kids (2)
• toy parachute designs (2)
• brief history of a parachute (1)
• how to make a toy parachute with silk (1)
• information on how skydiving was invented (1)
• make a toy parachute (1)
• parachutes history for kids (1)

Pages: 1 2

Let’s look at the different fundamental movements of this martial arts.

Aikido is martial arts that resulted from the combination of several disciplines. It was created by Ueshiba sometime in the 1940s. It was the result of Ueshiba’s search for a technique that provided him with contentment not only in the technical sense but also in the spiritual end.

Aikido comes from the three Japanese words, ai-ki-do, which means joining, spirit, and way respectively. In essence, aikido is a martial arts form that focuses on the joining of the spirit and the body and the mind to find the Way.

Aikido has many techniques and moves. Its basic structure comes from the throws and locks found in jujitsu and also from the movements that experts do when they are fighting with swords and spears.

Fundamental Techniques of aikido

Let’s look at the different fundamental movements of this martial arts.

Ikkyo

This is the first technique in aikido, where control is achieved by the use of the hand on the elbow and one near the wrist. This is the grip that is also that can apply pressure into the ulnar, which can be found in the medial portion of the arm.

Nikyo

This is the second of the techniques, which is characterized by an adductive wristlock that twists the arm and then applies pressure in the nerve that can be really painful.

Sankyo

This is the third technique that incorporates a pronating move. It directs an upward tension all through the arm, the elbow and the shoulder.

Yonkyo

The fourth installment in the fundamental movements of aikido, yonkyo uses a shoulder control movement similar to a ikkyo but this time there is no gripping of the forearm. Instead, the knuckles apply pressure on the radial nerve

Gokyo

The fifth technique is actually a variant of ikkyo. This time the hand gripping the wrist is inverted and twisted.

Aikido protective moves

Here are some of the moves that you can use in order to disarm your opponent.

Kotogaeshi – this is what is called in the English as the wrist return. In this move, the practitioner will place a wristlock and throw that will stretch up to the extensor digitorum

Iriminage – called the entering-body throw, here the practitioner or the nage will move into the space where the uke or the opponent is. This classic move resembles the clothesline technique.

Kokyunage – this is the breath throw, a term that refers to the various types of “timing throws.”

Koshinage – this move is aikido’s version of the hip throw where in the person will drop his hips a little lower than the opponent or the uke. He will then flip