Posted on 02/25/2018 9:31:24 PM PST by BenLurkin
How can a rocket engine achieve more than a 100-percent thrust? Well, RS-25 engines were first designed more than 40 years ago, for use with NASA's space shuttle, and the power level they were capable of achieving at the time is the margin known as 100-percent thrust, according to NASA. RS-25 engines are former space shuttle engines that have been modified to perform more powerfully than ever before.
"Increased engine performance is crucial for enabling SLS missions to deep space as the rocket evolves to be larger and carry astronauts and heavy cargo on a single flight," NASA officials said in the statement.
When the space vehicle is assembled and ready for launch, four of these formidable engines will create a combined 2 million lbs. of thrust, according to the statement. And there's more: A pair of boosters on the SLS will work with the RS-25 engines to supply the rocket with a whopping 8 million lbs. of total thrust.
...
In addition to RS-25 ignition, the "brain" of the engine underwent testing. The new flight controller is one of the latest modifications to the engine design and will help provide precision control as it communicates with the rest of the SLS rocket. And in an ongoing effort to make SLS more affordable, operators also tested out a shock-absorbing component on Feb. 21, manufactured through 3D printing.
(Excerpt) Read more at space.com ...
It’s a fundamental law of physics - every action has an equal and opposite reaction. So if a nozzle expels gasses with a given momentum rearwards, the spacecraft will gain the same momentum in the forward direction. And in the vacuum of space, there is no friction to diminish that effect.
A vacuum exerts no pressure at all. Do this experiment. Go to the bottom of a pool. Feel the increase in pressure. Now climb up to 20,000 feet and measure the barometric pressure. Much lower. With the Bernoulli effect, the lower air pressure over the top of a curved wing does not pull the aircraft, the higher pressure under the wing pushes it up.
“You know that Iraq’s Christians have been genocided since 911, right?”
No, and neither do you obviously. Whatta maroon!
“pressure of a boundless infinite vacuum?”
There is no such thing. I know that phrase sounded pretty smart, but it was nothing but retarded ignorance.
LOL, I meant that you need more than a tin can or aluminum foil on your rocket ship in order to withstand the pressure of an absolute vacuum, and the nozzle we had been discussing would likewise have to be made of very interesting material to withstand a boundless, infinite vacuum.
Next time do a little bit of research on the genocide of Christians in Iraq.
Why are you so ignorant of the BushObama legacy in Iraq?
The infinite vacuum of space would vacuum up and instantaneously disperse gasseous molecules faster than its ability to overcome through said nozzle.
Some other person here said that it is ion thrust in space, so looks like I’m right and, of course, the whole idea of rockets operating in a boundless, infinite vacuum makes no sense. There is no fire in a vacuum. No thrust or ignition. No air flow without those molecules sucked up as fast as the skin off your face is ripped away while your innards collapse into a pancake.
The “pressure” I was talking about in a vacuum is the pressure on a tin can to collapse it.
Thanks, just read this. I’m interested in honest discussion about this topic, and have enjoyed it. Thank you.
Gawd, give it up. You are wallowing in ignorance and believing you are showing your profound wisdom. Makes you look more stupid with each post.
Once again, rockets carry both fuel and oxidants. The space shuttle tanks held liquid hydrogen as fuel and liquid oxygen as an oxidant. Please, your stupidity is approaching the painful to others level. Try actually reading up on this subject. And also, once again, a vacuum crushes nothing, as it is nothing by definition. Pressure differential is what provides a crushing force.
Also, when the internal pressure is greater than the external pressure, the container becomes stiffer. We see this in tires, footballs, and basketballs, but it also occurs for metallic structures.
For example, a football is usually pressurized to 12.5 to 13.5 psig. If we pressurized it 14.7 psi (slightly over inflated), that is equivalent to having a football at 14.7 psia (1 atmosphere) surrounded by a vacuum.
So, the football at atmospheric pressure would not explode in a vacuum. Likewise, a thin-wall aluminum structure can be designed not to rupture due to the internal pressure structure. This has been demonstrated time and time again in vacuum chambers all over the world.
Now, if you create a vacuum inside of a container, it will be prone to collapse due to buckling. Submarines have a certain "crush depth", where the pressure exerted by the water is too great for the hull to handle. But the crush pressure is many times atmospheric pressure. Modern attack submarines have a crush pressure of over 1,000 psig.
You’re fucking stupid, the oxygen in the air IS an oxidizer, it’s no different if you bring the oxidizer with you!
btt
There is no pressure in a vacuum. The only pressure a ship has to contain is it’s internal atmo. 14.7 psi is sea level pressure on earth.
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