Why are round windows of the plane?

Why are round windows of the plane? It took two crashes to understand why
   One of the questions we have all asked when we embarked on an airplane commercial passenger was certainly linked to the porthole shape. Why is rounded, not square? Is it design or engineering has reason? The answer is very simple and fascinating science behind it.

First, square portholes were at the beginning. As a result of technological advances, increasingly planes flying above, where there is less turbulence, but where necessary to pressurize the interior. The differences in pressure, the metal fuselage expands and contracts, which greatly stress the material around windows, which disrupt blood, enhancing it.

Unfortunately, the two crashes were necessary for scientists to understand what caused them. All aircraft that were made after these accidents were equipped with portholes rounded to protect the integrity of the fuselage. The same principles were applied and portholes for cargo aircraft and space shuttles.

Perhaps you've wondered about the hole inside the glass, if you've seen before. Again, it's about regulation of blood pressure and the pressure that accumulates between the outside and the inside. Each window is made actually three layers, and the hole allows the air pressure between the outer layer and the middle to balance.

After Skreemr concept, Bombardier Charles amazes with a new invention of aircraft capable of reaching Mach 24, 12 times faster than Concorde. Although only ten people can carry, crosses over 20 000 km in less than 60 minutes.

The aircraft "Antipode has the ability to cross over 12 430 miles (20 000 km) and can be reached from London to New York in just 11 minutes.

Such flights operated with a magnetic rail system to effectively catapulted into the air, reaching Mach 10. The aircraft is placed on parallel conductive rails launching device using a magnetic field particularly strong. As a backup system, the aircraft could use some additional rockets which works with liquid oxygen and kerosene, helping plane "Antipode" to rise as much and achieve Mach 4. In turn, the aircraft engines impressive would it One could propel at speeds ten times faster than that of sound (12 349 km / h).

Flight problems this concept as the deafening noise that would be sent to the earth and the enormous heat that emits a release. This can however be reduced by using a LPM ("long penetration mode") that will reduce the extremely high temperatures of launch and the shock wave.

For now, the aircraft is intended for military and business environment, being transported in an extremely short time and very far two officials of States for example.

The announcement was made by Deputy Minister of Transport of Iran, Abbas Akhoundi quoted by Iranian media, the daily Le Figaro informs, quoted by Mediafax. During the visit the President of France, will be signed for the purchase of 114 Airbus said Akhoundi without providing details about favorite models and value the agreement. The Minister also said that Iran needs 400 aircraft for long-haul and medium and 100 devices for short distances. Iran currently has 256 aircraft, of which 150 are operational, operating with an average of 20 years.