dutch courage - 14/10/2006 2:56 PMDoes anybody know what tasks will be preformed during the november 22/23 EVA by Tyurin and Lopez-Alegria?
tesheiner - 16/10/2006 5:01 PMNow that the CMGs are on the news again I think it's time to ask for a second time if there are any info/results on the analysis of that CMG, which kind of damage was found inside, failure reasons, etc?
Spiff - 15/10/2006 9:47 PM Now that Elektron is offline again they are using some of the oxygen 'candles' again on ISS. 1. How do these work? 2. How many do they have and how much oxygen does 1 provide?
From the "ISS Russian Segment Life Support System (Star City, 1997)" guide (linked diagrams are stored on my Photobucket site):
The TGK (Fig. A-4) consists of a replaceable cartridge with an igniter, a striker mechanism, a filter, a dust collection filter, and a fan that are located inside one case. The TGK is designed for the thermal decomposition of an oxygen compound packaged in a cylindrical cartridge. When oxygen exits the generator, it is cooled by airflow. The oxygen generator is activated by the crew if ppO2 drops to 160 mmHg and per ground instructions. The TGK is activated by rotating the driving handle (knob) until a specific “click” sound is heard. This sound indicates that the pin has struck the ignition device and the chemical reaction has begun. One cartridge yields 600 L (21.2 ft³) of oxygen. The contents of the cartridge take 5-20 minutes to decompose at a reaction temperature of 450-500°C (842-932°F). Temperature of the outer surface of the TGK may reach 50°C (122°F). If the fan is running, it takes approximately 3 hours for the cartridge to cool down. The cartridge is replaced in the following way: the fan is stopped; the latch is opened; the clamping handle is turned 180°; the crossbar is unlatched; the cartridge is pulled out of the TGK. The cartridge replacement takes approximately 2 minutes. A cloth dust collector is placed over the fan intake. The collector is changed when full. The TGK fan is turned on by means of toggle switches TGK-1, TGK-2 on the systems power supply panel (PPS-23) (Fig. A-5, B-2).
The TGK (Fig. A-4) consists of a replaceable cartridge with an igniter, a striker mechanism, a filter, a dust collection filter, and a fan that are located inside one case. The TGK is designed for the thermal decomposition of an oxygen compound packaged in a cylindrical cartridge. When oxygen exits the generator, it is cooled by airflow. The oxygen generator is activated by the crew if ppO2 drops to 160 mmHg and per ground instructions. The TGK is activated by rotating the driving handle (knob) until a specific “click” sound is heard. This sound indicates that the pin has struck the ignition device and the chemical reaction has begun.
One cartridge yields 600 L (21.2 ft³) of oxygen. The contents of the cartridge take 5-20 minutes to decompose at a reaction temperature of 450-500°C (842-932°F). Temperature of the outer surface of the TGK may reach 50°C (122°F). If the fan is running, it takes approximately 3 hours for the cartridge to cool down.
The cartridge is replaced in the following way:
The cartridge replacement takes approximately 2 minutes.
A cloth dust collector is placed over the fan intake. The collector is changed when full. The TGK fan is turned on by means of toggle switches TGK-1, TGK-2 on the systems power supply panel (PPS-23) (Fig. A-5, B-2).
TGK = Tverdotoplivnyi Generator Kisloroda, the system for oxygen generation using solid state fuel (I don't know how many are on board, sorry
dutch courage - 16/10/2006 8:16 PMQuotetesheiner - 16/10/2006 5:01 PMNow that the CMGs are on the news again I think it's time to ask for a second time if there are any info/results on the analysis of that CMG, which kind of damage was found inside, failure reasons, etc?During today's ISS Mission Coverage Kyle Herring said the ground controlers had been testing with the current failed CMG. Spinning it up to 500 rpm and testing for vibrations and deceleration times. A vibrating bearing cover is presumed to be the culprit.
tesheiner - 17/10/2006 5:11 AMQuotedutch courage - 16/10/2006 8:16 PMQuotetesheiner - 16/10/2006 5:01 PMNow that the CMGs are on the news again I think it's time to ask for a second time if there are any info/results on the analysis of that CMG, which kind of damage was found inside, failure reasons, etc?During today's ISS Mission Coverage Kyle Herring said the ground controlers had been testing with the current failed CMG. Spinning it up to 500 rpm and testing for vibrations and deceleration times. A vibrating bearing cover is presumed to be the culprit.Thanks for the info about the current failed CMG.But I'm still looking for data on the failed CMG which was replaced last year.
Spirit - 19/10/2006 9:24 AMWhy will Roskosmos increase the production of Progress ships after 2009 when ATV and HTV will be flying. Now for a crew of three the Russians launch four Progress ships per year. The Progress transports 1 700 kg of cargo. 4 x 1 700 = 6 800 kg. That's for three crew members. ATV alone delievers 7 500 kg and HTV 7 900 kg. So one ATV and one HTV launches per year should be enough to support a six member crew. And still the Russians plan to increase Progress production instead of decreasing it. What's wrong with my calculations?A second question: 4 x Souyz per year for supporting six crew member rotation. This means that no space tourists and no short duration (8-10 days) cosmonauts will fly after 2009. Is that going to happen?
Spirit - 19/10/2006 3:36 PMI don't understand that. There will be 4 Souyzes. The first two will transport x3 astrounats that are members of a 6 moth expedition. Then the second two will transport the 6 crew members of the next expedition 6 moths later. So where are the tourists?
Jorge - 19/10/2006 9:39 PMAfter the shuttle fleet is retired, all six will rotate on Soyuz and there will be no tourists seats until either COTS or Orion becomes available, or Russia ramps up Soyuz production further to add dedicated tourist flights.
Spirit - 19/10/2006 9:24 AM...So one ATV and one HTV launches per year should be enough to support a six member crew....