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NASA Successfully Tests Revolutionary Rocket That Could Get Us to Mars Faster (www.sciencealert.com)

submitted 11 months ago by Hypx@kbin.social to c/technology@lemmy.world

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After setting foot on the Moon, the next destination for humankind is Mars, which presents a whole new set of challenges in speedy, long-distance space travel.

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[-] anonionfinelyminced@kbin.social 170 points 11 months ago

It's a Rotating Detonation Rocket Engine"

What makes the RDRE so revolutionary is that it makes use of a sustained detonation circling around a ring-shaped channel, fed by a mix of fuel and oxygen which is ignited by each passing explosion.
Crucially, the RDRE uses less propellant fuel than conventional rocket engines, and is simpler in terms of its machinery and mechanisms. That means going into space becomes cheaper, and traveling further distances becomes possible.

Saved you a click.

[-] ramjambamalam@lemmy.ca 38 points 11 months ago* (last edited 11 months ago)

NASA invented a space ship powered by a rotary engine? Noice, at least until the apex seals give out, but they should be good for 80k at least.

[-] RangerAndTheCat@lemmy.world 24 points 11 months ago

Wankel and Mazda shine blessings upon you and your RX family

[-] Cocodapuf@lemmy.world 2 points 11 months ago

The wankel and rdre aren't really related, but they're similar in that they're both oddball engines with surprising performance.

Of all of my near future rocket engine predictions, a working aerospike rdre was not on my list... I'm honestly very impressed!

[-] Agent641@lemmy.world 23 points 11 months ago

Thank you I was running low on clicks.

[-] prole@sh.itjust.works 16 points 11 months ago

That sounds sick. I wonder which sci-fi author came up with this idea ~60 years ago.

[-] c0mbatbag3l@lemmy.world 4 points 11 months ago

My bet's on Heinlein.

[-] ikidd@lemmy.world 1 points 11 months ago

I'd put money on Robert Forward.

[-] T156@lemmy.world 1 points 11 months ago

Maybe the Jetsons, or the turbine engines in Star Wars? If you squint hard enough, it comes close enough.

[-] Donebrach@lemmy.world 12 points 11 months ago

So it’s truthfully Revolutionary, hark! A spinning engine

[-] LazaroFilm@lemmy.world 11 points 11 months ago

So they invented the rocket powered wheel?

[-] Morphit@feddit.uk 28 points 11 months ago

Revolutionary

I see what they did there.

[-] Nighed@sffa.community 24 points 11 months ago* (last edited 11 months ago)

This is a fancy aerospike engine right? The rotating detinations gives it higher chamber pressure and therefore better ISP or something?

I will look for the Scott Manley video on this later (I think it was him?) Edit: also a Real Engineering one that explains the aero-spike nozzle

Anyone have the ISP of this experiment to compare to other engines?

[-] Ghyste@sh.itjust.works 6 points 11 months ago

Should be the rotating detonation engine.

[-] Nighed@sffa.community 3 points 11 months ago

Real engineering also did one (actually better than Scott's I think)

[-] PipedLinkBot@feddit.rocks 1 points 11 months ago

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[-] Nighed@sffa.community 3 points 11 months ago

Video is here (3 years old)

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[-] SkybreakerEngineer@lemmy.world 6 points 11 months ago

You know what gets even better ISP? NERVA

[-] Ejh3k@lemmy.world 4 points 11 months ago

I remember first hearing about the development of this back in the early 90s on Beyond 2000.

[-] Desistance@lemmy.world 3 points 11 months ago

I heard that the destination is actually Venus because it's closer and has oxygen in the upper atmosphere.

[-] SCB@lemmy.world 9 points 11 months ago* (last edited 11 months ago)

Venus is significantly more hostile than Mars, so while we definitely want to do more with Venus, Luna and Mars are clear next-ups for manned landings.

While all of Mars is hostile to human life, Venus is also incredibly hostile to equipment, and thus requires a different approach to even unmanned launches.

Current maximum lifetime for any unmanned craft in the Venusian atmosphere (to say nothing of the ground) is only about 2 hours.

[-] sndrtj@feddit.nl 5 points 11 months ago

Venus is interesting. While the surface is extremely hostile, the upper atmosphere is maybe the most similar to Earth-like environment out there in the solar system. At about 50km up in the air, the air pressure is about 1 Earth atmosphere, and the ambient temperature is about 20C. A 80/20% nitrogen-oxygen gas mixture is buoyant too at that depth, so a balloon filled with breathable air will just float. A rupture won't cause explosive decompression like it would on Mars either. In addition, the gravity one would experience is only very slightly less than that of Earth, and the large atmosphere also provides some shielding against radiation.

Mars doesn't have these perks. Mars is cold, really cold, with only 1/3rd of the gravity of Earth, has practically no radiation shielding, and any breach would cause explosive decompression and almost instant unconsciousness. On top of that, regular solar panels really don't work that well on Mars because of the extra distance from the Sun, while solar panels would actually work better in the upper atmosphere of Venus.

[-] danielbln@lemmy.world 4 points 11 months ago

Isn't that on the surface? I believe Venus's upper atmosphere is a lot more welcoming.

[-] SCB@lemmy.world 2 points 11 months ago

That's true about their upper atmosphere, but we're nowhere close to being able to capitalize on it (as in, no missions even planned). Closest we've got on paper is an orbiter by the early 30s.

Hopefully in my lifetime we see an upper atmosphere balloon or something. That alone would be unbelievably cool.

[-] TIMMAY@lemmy.world 2 points 11 months ago

give me a hot air balloon and a hang glider and send me out Ill be the pioneer

[-] SCB@lemmy.world 2 points 11 months ago* (last edited 11 months ago)

Dude what's neat about this is Oxygen on Venus is like Helium on Earth (less dense than most of the atmosphere, so rises naturally) so your balloon doesn't even need to be hot, just really sturdy.

[-] c0mbatbag3l@lemmy.world 3 points 11 months ago

Theres oxygen on Venus like there's argon on earth, it's so miniscule it's useless.

[-] BlackSkinnedJew@lemmynsfw.com 0 points 11 months ago

Correction: Get the rich fast to mars.

[-] iammike@programming.dev 4 points 11 months ago

If they're leaving them there, I'd be all for it

[-] SCB@lemmy.world 0 points 11 months ago

NASA plans to have a manned mission to Mars in the next 6 years.

[+] Shady_Shiroe@lemmy.world -6 points 11 months ago

[deleted]

[-] SonarTaxLaw@lemmy.world 7 points 11 months ago

2km is a measure of distance not speed...

[+] Shady_Shiroe@lemmy.world 0 points 11 months ago

[deleted]

[-] c10l@lemmy.world 6 points 11 months ago

The international standard is km/h.

[-] zergtoshi@lemmy.world 2 points 11 months ago

Why not using SI units and m/s?

[-] c10l@lemmy.world 3 points 11 months ago

km/h is an SI unit.

[-] zergtoshi@lemmy.world 2 points 11 months ago* (last edited 11 months ago)

I'm sorry to be a stickler, but it's not an SI unit.
Have a look at p. 145 and "Non-SI units that are accepted for use with the SI", if you want to know more: https://www.bipm.org/documents/20126/41483022/SI-Brochure-9.pdf/fcf090b2-04e6-88cc-1149-c3e029ad8232?version=1.22

[-] c10l@lemmy.world 2 points 11 months ago

Hey, no need to be sorry. I appreciate the search for correctness and especially the reference document.

Here's what I've found.

There is no mention of km/h in section 4, "Non-SI units that are accepted for use with the SI". It does mention h, making it a "non-SI unit that's accepted for use with the SI."

km/h is its own unit separate from h. It's a unit of speed, derived from km and h.

My gut feel at this point is that km/h could be an SI unit since it's a unit of speed derived from an SI unit for distance and a non-SI unit accepted for use with the SI for time.

Furthermore, searching the document for mentions of km/h, there's this bit on page 127, section 2.1, "Defining the unit of a quantity":

For a particular quantity different units may be used. For example, the value of the speed v of a particle may be expressed as v = 25 m/s or v = 90 km/h, where metre per second and kilometre per hour are alternative units for the same value of the quantity speed.

This paragraph suggests (even though it doesn't outright say it) that km/h is indeed an SI unit.

I haven't found anything clearly saying whether km/h is an SI unit or not. Not on that document, not by searching the web. The research above makes me lean towards the idea that it is one.

If you found otherwise, I'd love to compare notes and learn further.

[-] zergtoshi@lemmy.world 1 points 11 months ago

I see it quite simplistic: if it isn't listed as SI unit by the BIPM it isn't one.
Lending a helping hand on how to deal with derived units (e.g. km/h) doesn't mean those derived units are endorsed as SI units.
But that's just my point of view.

this post was submitted on 04 Jan 2024

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