ARCA

[Mandella]

Well, all I can say is that I will be watching this livestream with great interest.

 

[AU1.52]

Well, all I can say is that I will be watching this livestream with great interest.

 

It will be a splash for sure. Seeing will definitely be believing. If it works it will not of limited use in the future - to Earth only. For the next few hundred years there will be no liquid seas on Mars and none on the Moon ever.


How are they getting enough Thrust out of the 'engine' with just water for propellant?  First time looking at this thread, seems really hard to believe this can work.

[Lars-J]

Well, all I can say is that I will be watching this livestream with great interest.

 

It will be a splash for sure. Seeing will definitely be believing. If it works it will not of limited use in the future - to Earth only. For the next few hundred years there will be no liquid seas on Mars and none on the Moon ever.


How are they getting enough Thrust out of the 'engine' with just water for propellant?  First time looking at this thread, seems really hard to believe this can work.

That’s actually the least questionable aspect of this. Read through this thread (last 20 pages or so), and you’ll see calculations that show it is theoretically possible to build such a rocket, even if their described rocket falls short of being able to reach orbit.

But will ARCA be able to pull it off? No. That’s not their skill set. Swindling small time investors and shifting goalposts is.

I for one am looking forward to their live stream of this... (Prove me wrong, I dare you, ARCA!)

[gin455res]

Wonder how a CO2 based system would compare to ARCA's steam rocket - like a huge fire-extinguisher?


Or for more performance, can one make CO2 based catalytically combusted monopropellants (say  chilled CO2 with dissolved butane and oxygen/nitrous added)?

[AU1.52]

Wonder how a CO2 based system would compare to ARCA's steam rocket - like a huge fire-extinguisher?


Or for more performance, can one make CO2 based catalytically combusted monopropellants (say  chilled CO2 with dissolved butane and oxygen/nitrous added)?

Feels like we have gone back to the 19th century! Take stream train and point it to the stars!

[Phil Stooke]

Are we playing Space 1889 now?

[JCRM]

arguably all they have to do is put a tennis ball or equivalent into orbit to turn heads.

If they get all three stages firing at the right times they'll turn a fair few heads.

Have you correlated the staging velocities and altitudes with those presented by Arca?

[envy887]

Someone over on Reddit calculated the delta-v for the new three-stage EcoRocket Produs 2.1, based on the numbers from their latest video. This user concluded that largely due to the underperforming third stage (which is pressure-fed keroxide with a bell nozzle, not a steam-powered aerospike), they're coming in at under 75% the delta-v they'd need to achieve orbit. IANARS, so I can't verify this myself, but if so it rather undermines claims that they'll reach orbit by June. Oddly enough, this user says that the two-stage EcoRocket seemed to be significantly closer (over 90% the delta-v needed to reach orbit), but it had a substantially larger keroxide final stage.

And the kerosene/HTP stage is the tough part. If you have the ability to build a kero/HTP engine, why not use it for both stages of a 2-stage, or for all three stages of a 3-stage rocket? It either makes the rocket gross mass and size much smaller for a given payload, or the payload much larger for a given rocket gross mass and size.

The adiabatic flame temp of 85% peroxide at optimal mix ratios with kerosene is ~2700 K. That's just a bit harder to deal with than steam at 250 C, or even steam with a little decomposed peroxide thrown in for some extra kick.

ISTM that the reason to go with a smaller (and smaller) kero/HTP stage is because that even that small engine is very hard to build, and larger engines are very, very hard to build. But without it they can at best get to about 2 km/s. So where is that engine?

[Fmedici]

They took the competition with SpaceX and Dogecoin seriously:

https://twitter.com/arcaspace/status/1399748278531600395

[Craftyatom]

https://twitter.com/arcaspace/status/1399748278531600395

Well if they want to be the "first scam launched in space", I have bad news...  I'm fairly sure SPC counts https://spacechain.com/

Now, there are absolutely still remaining "firsts" for scam in space - SpaceChain's standalone satellites and ISS node don't exactly cover the whole gamut - but I would expect some more specific statements if they were chasing one of those.  Instead, this just comes off as oblivious.

I'll refrain from making any statements about the viability of in-space scam or ARCA's June launch date.

[launchwatcher]

https://twitter.com/arcaspace/status/1399748278531600395

Well if they want to be the "first scam launched in space", I have bad news...  I'm fairly sure SPC counts https://spacechain.com/

Now, there are absolutely still remaining "firsts" for scam in space - SpaceChain's standalone satellites and ISS node don't exactly cover the whole gamut - but I would expect some more specific statements if they were chasing one of those.  Instead, this just comes off as oblivious.

Surely scamgraphy has been used to protect spacecraft command & telemetry channels for much longer than that...

[joek]

Surely scamgraphy has been used to protect spacecraft command & telemetry channels for much longer than that...

Not that it makes much difference, but in this context "scam" = "scam currency". If you look at their aetherscam, not a lot of meat there. In any case, if we see anything in the near future (unlikely IMO), likely to be something more like a sounding rocket ("see, we launched!").

[libra]

https://twitter.com/arcaspace/status/1399748278531600395

Well if they want to be the "first scam launched in space", I have bad news...  I'm fairly sure SPC counts https://spacechain.com/

Now, there are absolutely still remaining "firsts" for scam in space - SpaceChain's standalone satellites and ISS node don't exactly cover the whole gamut - but I would expect some more specific statements if they were chasing one of those.  Instead, this just comes off as oblivious.

I'll refrain from making any statements about the viability of in-space scam or ARCA's June launch date.

And Superman

https://en.wikipedia.org/wiki/Krypto

SpaceChain

Did you said Spacechien ?

(I'll take my coat...)

[Steven Pietrobon]

Some Facebook posts.

June 13 at 11:52 PM
"Final preparations before the training start."

June 15 at 5:22 PM
"Mission10 #LaunchGreen updated patch, after the EcoRocket upgrades."

[Conexion Espacial]

ARCA Space published this photo on instagram, the company says in one of its latest publications the following:

ARCA will present the EcoRocket on June 27th, 2021 in the Ovidiu Square from Constanța. The public will be able to see the vehicle, take photos and interact with the team. ARCA wanted to have this event to allow the public to see the vehicle before entering the naval base for the launch training.

[Lars-J]

Mission 10? Have I missed 9 launches?

[trimeta]

Mission 10? Have I missed 9 launches?

The Wikipedia has a list of ARCAspace missions, although between it being somewhat out of order (why is Mission 8 before Mission 7?), the wide range of vehicles being nominally tested, some missions being un-numbered, and some missions (7 and 9) seemingly skipped altogether...well, it's what one should expect from ARCAspace.

[GWH]

Those fins look like they're mounted with spindly little brackets barely worthy of Ikea furniture and not much else...

[trimeta]

Also, pardon my ignorance of aerospike technology, but isn't there supposed to be a ring of combustion chambers (or in the case of ARCA technology, garden hoses) around the outside, aiming towards the spike, with the idea being that the flow is contained on one side by the spike and on the other side by atmospheric pressure? In the pictures ARCA showed above, I don't see anywhere for the boiling water to pour out. Unless that black shadowed area is basically a slit, and the water just comes out through there? Still doesn't seem like that would do much to direct the water stream inwards, towards the spike.

[Fmedici]

From Facebook:

We arrived in Constanta, Ovidiu Square. We are waiting for you!