The tests were conducted for SpaceX’s Starship Hopper. As reported by Tesla Rati, five previous Raptor engines had not survived tests, believed to be due to issues with resonance that can affect complex engineering structures. Mr Musk confirmed the sixth test was successful as he responded to a tweet from a fan by saying: “Exciting progress in Boca! Hopper almost ready to hover. Based on tonight’s test, looks like 600 Hz Raptor vibration problem is fixed.”
The SpaceX founder also used the opportunity to share brand new photographs of the Raptor engine.
Resonance was considered the cause behind the infamous non fatal Tacoma Narrows Bridge collapse in 1940.
Constant winds running across the suspension bridge matched the natural frequency of the bridge, causing it to collapse.
The collapse was a significant event in the history of physics and engineering.
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If the engine gets through more strenuous tests which the company has undertaken to push it to the limit if could be delivered to Boca Chica, where SpaceX’s private launch site is in just a matter of weeks.
An untethered space flight is when an astronaut is able to leave their transport without being connected by wires or any other form connection.
The first time NASA were able to perform one came in 1984 with astronaut Bruce McCandless travelling 328ft from the shuttle.
Mr McCandless used a jet pack to propel to and from the vessel.
Mr Musk founded SpaceX in 2002 with the aim to reduce the cost of space travel and increase access to space and help enable eventual colonisation of Mars.
It is the fist private company to reach orbit or send a spacecraft to the International Space Station.
South African born Mr Musk, 48, has a net worth of $19.2billion (£15.3billion).
He has degrees in both Economics and Physics, both from the University of Pennsylvania.