Quote from: baldusi on 08/12/2011 02:46 pmQuote from: Danderman on 08/12/2011 02:07 pmQuote from: baldusi on 08/12/2011 01:55 pmCouldn't this include the mods necessary for Soyuz-2b?My impression is that the mods described by Energia would cause Soyuz to lose mass, which is the opposite of what is required for Soyuz 2-1b. A lighter Soyuz and a more capable LV mean that existing drop zones will be unusable.Would Soyuz be volume limited? Couldn't they simply add more cargo/fuel? Or at that point the LAS becomes the limiting factor? If so it would seem to me that the Soyuz would be limited to the Soyuz-2a. Since it's about 17% cheaper, doesn't seems to be a problem (unless you want a significantly higher ISS).On the other hand, the Progress MS on Soyuz-2b should put a significant bigger amount of cargo, wouldn't it? It would seem interesting to understand how does this relates to the Progress that's supposed to bring the MLM.There are controlability issues for Soyuz that do not exist for Program M1 if attempts are made to fill the OM (BO) with significant amounts of additional cargo; of course the LAS would present problems with an extra ton of mass on Soyuz.
Quote from: Danderman on 08/12/2011 02:07 pmQuote from: baldusi on 08/12/2011 01:55 pmCouldn't this include the mods necessary for Soyuz-2b?My impression is that the mods described by Energia would cause Soyuz to lose mass, which is the opposite of what is required for Soyuz 2-1b. A lighter Soyuz and a more capable LV mean that existing drop zones will be unusable.Would Soyuz be volume limited? Couldn't they simply add more cargo/fuel? Or at that point the LAS becomes the limiting factor? If so it would seem to me that the Soyuz would be limited to the Soyuz-2a. Since it's about 17% cheaper, doesn't seems to be a problem (unless you want a significantly higher ISS).On the other hand, the Progress MS on Soyuz-2b should put a significant bigger amount of cargo, wouldn't it? It would seem interesting to understand how does this relates to the Progress that's supposed to bring the MLM.
Quote from: baldusi on 08/12/2011 01:55 pmCouldn't this include the mods necessary for Soyuz-2b?My impression is that the mods described by Energia would cause Soyuz to lose mass, which is the opposite of what is required for Soyuz 2-1b. A lighter Soyuz and a more capable LV mean that existing drop zones will be unusable.
Couldn't this include the mods necessary for Soyuz-2b?
I don't have any specs. I don't even have much of an update from the 2011 announcement about Soyuz-MS. I did find this snippet:http://www.energia.ru/ru/news/news-2013/public_06-19.htmltranslated by Google and me:It is known that RSC Energia is working on the creation of ships such as "Soyuz " and " Progress" of the new series - "Soyuz MS" and " Progress MS." Commissioning of the first cargo ship series " MS" is planned in 2015. In 2014, the factory should begin testing this ship. I recall that , in contrast to the "Soyuz TMA " and " Progress M " on the "Soyuz MS" and " MS Progress " will be installed satellite navigation systems GLONASS and GPS, as a modern radio link control with satellite channel connection , upgraded hardware automatically rendezvous"Kurs" , a digital television radio link , extra micrometeorite protection , as well as for a series of improvements aimed at improving the reliability and security of ships, increasing the level of harmonization and the replacement of obsolete materials and components to modern.
Mr. Zak hears that Soyuz MS is planned to begin factory tests sometime in 2015, with factory tests concluding in 2016 (if no issues occur) with first flight around early 2017 (this timeline matches nicely with anik's Russian Launch Schedule). Also apparently a TMA-M deferred item, the flight computer system in Instrumentation Compartment is planned to move to the descent compartment thus replacing Descent Computer System.
Russian federal space agency, Roskosmos, may renew short-term ten-day flights to the ISS when a new generation of U.S. spacecraft enters service. On the other hand, long-term missions to the ISS are to be prolonged to nine months as soon as upgraded Soyuz spacecraft are commissioned in 2015, the director of human space flight at Roskosmos, Aleksey Krasnov, told Itar-Tass Monday.
“We may switch to nine-month flights, as we hope that the new spacecraft, which is now in the upgrade stage [Soyuz TMA-MS], will be able to stay in orbit longer than the current one [Soyuz TMA-M],” Krasnov said.
The first Soyuz TMA-MS flight is scheduled for 2015. This Soyuz version is to have better solar cell panels, modified docking and attitude control engines, which will allow for approaching and docking with the ISS even if one of the engines fails, and ensure re-entry despite any two engine failures. The spacecraft will have modern communication and emitter location systems, as well as command line system - all using satellite data transmission channels. Motion control and navigation systems will undergo the most dramatic overhaul.
So no more H2O2 for RCS oxidizer?
Quote from: baldusi on 12/17/2013 01:59 pmSo no more H2O2 for RCS oxidizer?that's a major change and "might" be going in the wrong fuel direction?http://forum.nasaspaceflight.com/index.php?topic=33280.0
The first Soyuz TMA-MS flight is scheduled for 2015
QuoteThe first Soyuz TMA-MS flight is scheduled for 2015The first Soyuz MS launch wil be NET March 2017.
Quote from: anik on 12/17/2013 05:21 pmQuoteThe first Soyuz TMA-MS flight is scheduled for 2015The first Soyuz MS launch wil be NET March 2017.Are this different spacecraft?
Quote from: Olaf on 12/17/2013 05:30 pmQuote from: anik on 12/17/2013 05:21 pmQuoteThe first Soyuz TMA-MS flight is scheduled for 2015The first Soyuz MS launch wil be NET March 2017.Are this different spacecraft?AFAIK, They are same but some corporations and agencies are using different designations.
Quote from: russianhalo117 on 12/17/2013 05:32 pmQuote from: Olaf on 12/17/2013 05:30 pmQuote from: anik on 12/17/2013 05:21 pmQuoteThe first Soyuz TMA-MS flight is scheduled for 2015The first Soyuz MS launch wil be NET March 2017.Are this different spacecraft?AFAIK, They are same but some corporations and agencies are using different designations.But there are a difference of two years, or maybe one year and some months.
Starting with Soyuz TMA-5, the H2O2 system had already been improved, resulting in a slight life-duration extension. I doubt they can do better with this system (SIOS) : I guess they should make a major redesign of it.
Quote from: Nicolas PILLET on 12/17/2013 04:19 pmStarting with Soyuz TMA-5, the H2O2 system had already been improved, resulting in a slight life-duration extension. I doubt they can do better with this system (SIOS) : I guess they should make a major redesign of it.there may not have been an actual improvement in the H2O2 system for TMA-5, but rather experts from Energia re-qualified the system from 180 days to 210 days.
Don't rule out a better containment system for the Soyuz-MS H202.