Whois & Analysis for realtourvision.com

An unmanned aerial vehicle (UAV), commonly known as a drone, is an aircraft without a human pilot aboard.

UAVs are a component of an ; which include a UAV, a ground-based controller, and a system of communications between the two.

The flight of UAVs may operate with various degrees of autonomy: either under remote control by a human operator, or fully or intermittently autonomously, by onboard computers.

More emerged during World War II – used both to train antiaircraft gunners and to fly attack missions.

Nazi Germany produced and used various UAV aircraft during the war.

Jet engines entered service after World War II in vehicles such as the Australian GAF Jindivik, and Teledyne Ryan Firebee I of 1951, while companies like Beechcraft offered their Model 1001 for the U.S. Navy in 1955.

Nevertheless, they were little more than remote-controlled airplanes until the Vietnam War.

The U2 360° Tour was a worldwide concert tour by rock band U2.

Launched in support of the group's 2009 album No Line on the Horizon, the tour visited stadiums from 2009 through 2011.

The concerts featured the band playing "in the round" on a circular stage, allowing the audience to surround them on all sides.

To accommodate the stage configuration, a large four-legged structure nicknamed "The Claw" was built above the stage, with the sound system and a cylindrical, expanding video screen on top of it.

At tall, it was the largest stage ever constructed.

U2 claimed that the tour would be "the first time a band has toured in stadiums with such a unique and original structure.".

Vulcanization or vulcanisation is a chemical process for converting natural rubber or related polymers into more durable materials by the addition of sulfur or other equivalent curatives or accelerators.

These additives modify the polymer by forming cross-links (bridges) between individual polymer chains.

Vulcanized materials are less sticky and have superior mechanical properties.

The term vulcanized fiber refers to cellulose that has been treated in a zinc chloride solution to cross-link the cellulose fibers.