Quote from: gosnold on 06/26/2016 10:19 amWhat would be the delta-v of this stage with no payload?It is quite difficult even to guess/estimate without knowing values of Specific Impulse, thrust (to estimate gravity losses) and mass of propellant
What would be the delta-v of this stage with no payload?
I don't read Russian but I see in the pictures something about "70 km/s" which I think is the Isp and a mass of 20290kg. So it seems all that's missing is the mass of propellant, and maybe it's in the picture. If you can make sense of them, could you post a translation?
Quote from: gosnold on 06/26/2016 07:01 pmI don't read Russian but I see in the pictures something about "70 km/s" which I think is the Isp and a mass of 20290kg. So it seems all that's missing is the mass of propellant, and maybe it's in the picture. If you can make sense of them, could you post a translation?70 km/s is exhaust velocity, Isp is Ve/g0, so 7136 sec.Thrust is 18H (~2 kg force).Propellant load is not specified on a picture, only total mass.
Abstract: The design-ballistic analysis of the effect of parameters of elliptical basing orbits of the reusable interorbital tug based on the nuclear power plant and electrorocket propulsion system of megawatt-class safety and efficiency of its use in the program which provides heavy cargo traic to geostationary and near-Moon orbits has been made. It is shown that in comparison with the option of traditionally considered circular radiation safe orbit of altitude Hcir = 800 km the use of high elliptical basing orbits allows to reduce by approximately two orders the duration of staying in the single light of the tug itself and the launched payload in the area of intensive contamination with anthropogenic space debris. In this case the total weight of the payload to be delivered by the tug to target orbit can be signiicantly increased during its life cycle, as well as the xenon consumption per unit of weight of the payload to be delivered can be reducedseveral times.Key words: reusable interorbital tug, nuclear power plant, electrorocket propulsion system,basing orbit.
Some fresh news about this project https://www.rt.com/news/442521-nuclear-propulsion-system-russia/
https://forum.novosti-kosmonavtiki.ru/index.php?topic=11908.10280Ekipazh radiators !? or this is just a prototype ?Also it seems they abandoned the droplet radiator concept .
I wonder where the they come from. No source is given by the person who posted them.
Quote from: RON_P on 09/12/2020 10:49 pmhttps://forum.novosti-kosmonavtiki.ru/index.php?topic=11908.10280Ekipazh radiators !? or this is just a prototype ?Also it seems they abandoned the droplet radiator concept .I understand these pictures show elements of the 1 megawatt reactor (or more likely its prototype) that is being developed by KB Arsenal under a project started in 2010 and managed jointly by Roskosmos and Rosatom. Ekipazh, on the other hand, is a top-secret military project assigned to KB Arsenal by the Ministry of Defense in 2014. It uses a much more modest thermionic nuclear reactor and may have something to do with space-based electronic warfare. There does not seem to be a connection between the two projects.Anyway, thanks for posting that link. The pictures are definitely interesting because even the 1-megawatt reactor has become shrouded in secrecy in recent years. I wonder where the they come from. No source is given by the person who posted them.
1. What will launch the thing ( Angara A5 ?) .2.Also why they even develop this thing without specific mission for it i.e a JIMO type mission or a manned/cargo mars mission ( but 1 MWe would not be enough ) here is a recent NASA presentation on the subject http://fiso.spiritastro.net/telecon/Mason_8-19-20/ .3. Do you have any information on the reactor itself ( like cooling system , mass , ALPHA and electric conversion system ) .
Court documents also reveal that KB Arsenal signed a contract (called TEM-Arsenal) with the Khrunichev Center on July 1, 2015, for work on an orbital demonstrator identified as 327AN30-TEM-1 to be launched by the Angara-A5 rocket. According to the documentation, KB Arsenal initially studied a 140-kilowatt version of the demonstrator, but in May 2016 was ordered to upgrade this capacity to 500 kilowatts, one resulting problem being that it exceeded the launch capacity of the Angara-A5 by about 1.5 tons.[11] Roscosmos chief Dmitri Rogozin recently said that it has not yet been decided if it is necessary to build a 500-kilowatt interim version before moving on to the one-megwatt version.[12]The one-megawatt TEM project appears to have been affected by the significant budget cuts that hit Russia’s Federal Space Program for 2016–2025, approved in March 2016. At that point, Roscosmos ordered a series of studies that would have resulted in the launch of a demonstrator satellite no sooner than 2025.[13] KB Arsenal was assigned to one of those studies (called “Yadro” or “Core”) in November 2017. This was aimed at defining possible missions for TEM by November 2018 and would have to result in determining technical specifications for actual flight vehicles (with a reactor capacity ranging from 100 kilowatts to one megawatt) to be developed under a follow-on effort called Nuklon.[14] An indication that the full-scale one-megawatt TEM may not fly for at least another decade came in a recently released Roscosmos tender, which calls for completing ground-based infrastructure for TEM at the Vostochny Cosmodrome no earlier than 2030, a staggering 20 years after the project was initiated.[15]
Electronic warfare is also one of the missions studied by KB Arsenal for the one-megawatt TEM project under the previously mentioned Yadro research program in 2017–2018. As is known from the tender documentation released for Yadro, Roscosmos ordered participants in the tender to look at EW payloads capable of interfering with “control, intelligence, communications and navigation systems.” KB Arsenal proposed an EW payload with a maximum mass of five tons and a power source generating between 100 and 1,000 kilowatts. The dimensions of the EW antenna were given as 10 x 2.5 x 0.4 meters in “transport mode.” The only other missions in Roscosmos’ specifications for Yadro were remote sensing, directed energy transfer using lasers, communications, and interorbital transport of payloads.[33] The solar system missions widely advertised for the one-megawatt TEM in the early years of the project were notably absent from the objectives.All this, along with the fact that the one-megawatt TEM project has become increasingly cloaked in secrecy in recent years, is a possible sign that it is being at least partially militarized. It is worth noting in this respect that training sessions on handling hazardous radioactive materials that were organized last year for both Roscosmos and KB Arsenal specialists were described as being related to the use of “nuclear energy for defense purposes.”[34]
The demonstrator reactor will 1 MW electric or thermal ?
The fact that the images posted on the NK forum were made in a section of the Army 2020 exhibition that was off limits to the general public would tend to confirm the latter speculation.
There is a thread devoted to the 1 megawatt TEM here:https://forum.nasaspaceflight.com/index.php?topic=37957.0Perhaps it's better to continue this discussion there.Again, Ekipazh is a different project.[zubenelgenubi: I split/merged these posts from here to there.]