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The tests were done for SpaceX's Starship Hopper. As noted by Tesla Rati, five previous Raptor engines had not survived the tests, which would be due to resonance problems that could affect complex technical structures. Mr Musk confirmed the success of the sixth test by answering a tweet from a fan saying, "Interesting progress to Boca! Hopper almost ready for the hover. According to the test tonight, the Raptor vibration problem at 600 Hz is solved. "
The founder of SpaceX also took the opportunity to share new photographs of the Raptor engine.
Resonance was considered the cause of the collapse of the infamous Tacoma Narrows Bridge in 1940.
Constant winds across the suspension bridge corresponded to the natural frequency of the bridge, causing it to collapse.
The collapse was a landmark event in the history of physics and engineering.
READ MORE: Space bomb: the United Kingdom becomes the first spaceport in Europe
If the engine passes more difficult tests that the company is committed to pushing to the maximum, it could be delivered to Boca Chica, where the private SpaceX launch site is only a few weeks away.
An unattached spaceflight occurs when an astronaut is able to leave his means of transport without being connected by cables or other form of connection.
The first time NASA was able to make one, it was in 1984 that astronaut Bruce McCandless was traveling 328 feet from the shuttle.
Mr. McCandless used a jet plane to get to and from the ship.
Mr. Musk founded SpaceX in 2002 with the goal of reducing the cost of space travel, increasing access to space and contributing to a possible colonization of Mars.
It is the first private company to reach orbit or to send a spaceship to the International Space Station.
Born in South Africa, Mr. Musk, 48, has a net worth of $ 19.2 billion (£ 15.3 billion).
He is a graduate in economics and physics from the University of Pennsylvania.
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