No methane-powered rocket has ever made it to orbit, with Starhopper’s test hop the other day being the first time a methane-powered rocket engine had actually taken flight.
If it lives up to its potential, maybe 1,000 is within the realm of possibility one day.”SpaceX’s existing engine is called Merlin, which is used on its operational Falcon 9 and Falcon Heavy rockets, but Raptor heralds a significant improvement. No methane-powered rocket has ever made it to orbit, with Starhopper’s test hop the other day being the first time a methane-powered rocket engine had actually taken flight. Methane apparently is an awesome rocket fuel. For this rocket engine, the mass flow rate of the fuel coolant is set at \(\phi\) = 0.3 of the total methane flow into the combustion chamber.
However, on November 7, 2018 Elon Musk tweeted, "Falcon 9 second stage will be … You will hear from us shortly. To do so will require a vast new spacecraft, powered by a new rocket engine unlike anything that’s been seen before. “And making it more reusable with little to no refurbishment is the idea.
As I understand it, there are currently two Methane fueled liquid rocket engines under development in the United States, the Raptor by SpaceX and the BE-4 by Blue Origin. In the first ten years of SpaceX, the company developed a variety of By mid-2015, SpaceX had developed a total of 9 rocket engines architectures in the first 13 years of the company's existence. With a rocket it’s less than one per cent traditionally.”Raptor also uses what’s known as a full-flow staged combustion engine, only the third engine in history to employ this technique, whereas Merlin uses the more common open cycle system. That’s definitely going to help their business case if they can just fly over and over.”The reusability is a key aspect, as Musk has said each engine needs to be capable of flying up to 1,000 times to support the ambitious operations of Starship. “And it does this in a very clever way that only the Russians have done previously… by putting all the propellant in the engine through the preburners.”The end result is that Raptor has a much higher pressure than Merlin, about three times greater, making it the highest pressure rocket engine in existence and leading to its aforementioned larger thrust than Merlin despite its similar size.
Combined, these vast machines are designed to take up to 100 people into space, possibly to the Moon and Mars, with a tentative launch of humans around the Moon planned in 2023.
But its use of liquid oxygen and methane – something largely unprecedented in the rocket industry – and its innovative design means that it just might be SpaceX’s ace in the hole when it comes to exploring the Solar System.“There is no other rocket engine capable of producing as much energy out of liquid methane and liquid oxygen as the Raptor engine,” says Tim Dodd, an industry expert who runs the popular Everyday Astronaut YouTube channel. The previous two attempts at such an engine, one in the Soviet Union in the 1960s and another in the US in the early 2000s, never made it beyond testing.A full-flow stage combustion engine refers to how a pump spins a turbine to drive the engine, using what’s called a preburner to get this process going by injecting a small amount of fuel.
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