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I am wearing aluminum trousers, fire protection layers and heavy boots. No, I will not be fighting fires in the hills of Southern California. Instead, I'm going to fly a jetpack, and its owner is worried I won't fry myself with a 1,000-degree engine explosion. Earplugs in, helmet on, jets landing - I'm ready for takeoff. Soaring on thrust pillars is the stuff of dreams, except it can be very painful if everything goes wrong. David Memon is the inventor who taught me how to control the machine that provides this heat, noise and potential disaster. His latest design from Jetpack Aviation ($340,000) uses six small jet engines (the version I tried had two larger ones) in a backpack that weighs about 90 pounds.
Jet Pack T-73
A hand grip controls height, speed and pitch, and the engines are mounted on a gimbal so the jetpack can move forward, backward or sideways. Small, delicate movements of the controls ease the weight off my legs - and suddenly I'm flying, keeping my body as still as possible to keep the jet from flying in a direction I don't want. I was only 20 or 30 feet in the air under the safety rope system, but the people on the ground were already starting to look smaller. For a trained jetpack pilot, any altitude up to 10,000 feet at which you would need oxygen is theoretically attainable. Aviation regulators, however, are still working out how to deal with jetpacks; In the United States, they are considered small aircraft that can fly low, away from urban areas. Memon will teach someone to fly in seven to ten days for about $50,000. It also offers the flavor of the day for $4,950.
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As unlikely as it seems, driving a competitive personal jet is just out. In less than two years, Richard Browning's British-based Gravity Industries created a real-life Iron Man suit. Browning's jet suit is tougher than Memon's package, but he has already sold a few for £340,000 (about $446,000), including training. It will teach non-owners to fly for £15,000 (about $20,000) a day.
Zipped into the suit, I have a jet engine strapped to my back (with a fuel tank) and two jet engines in a sort of casing that goes over each arm, with a throttle trigger on the right side. And that, to stop blowing everything but a few electronics, it is. Where the thrust is directed and what I can do with it is where I point my hands. Balancing a total of 380 pounds of thrust from five engines is not easy. But when I learn the angle at which I need to keep my back and arms to drive those hot waves of kerosene power, I gently - but forcefully - lift off the ground.
For both systems, the flight time is about 10 minutes (depending on the person's weight). Memon claims that speeds in excess of 200 mph are possible with his system, but the speeds seen so far are closer to 30 mph. Once the regulatory issues are resolved, the sky really is the limit.
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A jet pack, rocket belt or rocket pack is a propellant device that uses gas or liquid to propel a person through the air. This concept has been around for quite some time in science fiction and became widespread in the 1960s. Real jetpacks have been developed using different mechanisms, but their application is much more limited than their fictional counterparts due to the challenges of the Earth's atmosphere, gravity, the low energy potential of useful fuels, and the unsuitability of the human body. flying, and are mostly used for stunts. Astronaut jetpacks have been practically used in extravehicular activities due to the remote weightlessness and lack of frictional environment in orbit. The term jet suit is used for systems that include jet packs and jet packs attached to weapons (eg Daedalus flight packs).
In the most general terms, a jetpack is a wearable device that allows the user to fly with a thrust. With the exception of use in a microgravity environment, this thrust must be elevated to overcome the force of gravity and must overcome the weight of the user, his own jetpack, and his fuel. This requires that the jet pack must continuously push the mass down.
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Although some designs provide power and/or mass from an external, ground-based source, all of the flight's fuel must be carried in the package for unstoppable flight. This creates problems related to the overall mass ratio, which limits the maximum flight time to a few minutes, rather than the continuous flight depicted in science fiction.
Russian inventor Alexander Andreev developed the first package design in 1919. Nikolai Rynin and technology historian Yu welcomed the project. V. Biryukov and S. V. Golotyuk. A pat was subsequently issued but apparently never taken or tested. These were oxygen and methane powered (probably rocket) with wingspans of 1 meter (3 feet) each.
The hydrogen peroxide activated gene is based on the decomposition reaction of hydrogen peroxide. Almost pure hydrogen peroxide is used (90% in Bell Rocket Belt). Pure hydrogen peroxide is relatively stable, but when it comes into contact with a catalyst (for example, silver) it decomposes in less than 1/10 millisecond in a mixture of superheated steam and oxygen, multiplying 5,000 times: 2 H
. The reaction is exothermic, i.e., to liberate a lot of heat (about 2,500 kJ/kg [5,800 BTU/lb]), in this case a steam-gas mixture is formed at 740 °C [1,360 °F]. This hot gas is used only as a reaction mass and is fed directly to one or more jet nozzles.
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A major disadvantage is the limited operating time. A jet of steam and oxygen can provide significant thrust from a relatively light rocket, but the exhaust velocity of the jet is relatively low and so the specific impulse is low. Currently, such rocket belts can only fly for 30 seconds (due to the limited amount of fuel the user can carry without assistance).
A more conventional dual propellant can double the specific impulse. However, although the exhaust gases from peroxide-based engines are very hot, they are much cooler than those produced by other propellants. The use of a peroxide-based propellant greatly reduces the risk of a fire/explosion causing serious injury to the operator.
In contrast, for example, turbojet engines, which primarily exhaust atmospheric air to generate thrust, find it much easier to build rocket packs than devices using turbojets. Building a classic Wdell Moore rocket package can be done under workshop conditions, with good engineering training and a high level of equipment manufacturing.
This situation limits the field of application of rocket packages to spectacular public display flights, i.e., stunts; For example, flights were arranged during the opening ceremony of the 1984 Summer Olympics in Los Angeles, USA.
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In Romania, and, showing no interest, he communicated his idea to the American Embassy. In 1962, the backpack was created at Bell Laboratories based on Justin Capra's prototype. The backpack is now on display in a museum where it is kept safe.
In 1958, Jainers Gary Burdett and Alexander Bohr of Thiokol Corporation developed a hopping belt they called Project Grasshopper. A thrust was created by high pressure compressed nitrogen. Two small nozzles were attached to the belt and pointed vertically down. A valve containing the belt could open, releasing nitrogen from the gas cylinder through nozzles, which threw it up to 7 meters (23 ft). When you continue, the thrust of the jump belt enables you to run at speeds of 45 to 50 km/h (28 to 31 mph). Later, Burdett and Bohr tested a version powered by hydrogen peroxide. A servant showed the jump belt,
In 1959 the Aerojet General Corporation won a contract with the US Army to manufacture the jet pack or rocket pack. Richard Peeples made the first powered flight with his Aeropac in the early 1960s.
The army did not lose interest in this
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