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#11
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The Zvezda main thrusters had a certified lifetime of one year, which
expired in 2001. Also, Progress blocks those thrusters. Bill the Cat wrote in message ... (Explorer8939) wrote in om: Well, not exactly. First off, the ISS "thrusters" are not too useful for reboost. They are mainly used for attitude control, but are not particularly useful for orbital changes. Are you forgetting Zvezda's twin 300-kgf reboost engines? |
#13
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Maybe RLV rocket engines are certified for restarts, but the main
Zvezda engines are good for one year, and that's it. Bill the Cat wrote in message .. . (Explorer8939) wrote in om: Bill the Cat wrote in message ... (Explorer8939) wrote in om: Well, not exactly. First off, the ISS "thrusters" are not too useful for reboost. They are mainly used for attitude control, but are not particularly useful for orbital changes. Are you forgetting Zvezda's twin 300-kgf reboost engines? The Zvezda main thrusters had a certified lifetime of one year, which expired in 2001. Nope, the lifetime is specified by number of starts, not time. The engines are well within the limit. Also, Progress blocks those thrusters. Only when there's a Progress there. |
#14
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(Explorer8939) wrote in
om: Bill the Cat wrote in message .. . (Explorer8939) wrote in om: Bill the Cat wrote in message ... (Explorer8939) wrote in om: Well, not exactly. First off, the ISS "thrusters" are not too useful for reboost. They are mainly used for attitude control, but are not particularly useful for orbital changes. Are you forgetting Zvezda's twin 300-kgf reboost engines? The Zvezda main thrusters had a certified lifetime of one year, which expired in 2001. Nope, the lifetime is specified by number of starts, not time. The engines are well within the limit. Also, Progress blocks those thrusters. Only when there's a Progress there. Maybe RLV rocket engines are certified for restarts, but the main Zvezda engines are good for one year, and that's it. Keep repeating that; maybe you'll convince yourself, if no one else. The reboost engines are rated for 250 firings or 25,000 sec on-time, whichever comes first. |
#15
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Bill the Cat wrote in message .. .
Maybe RLV rocket engines are certified for restarts, but the main Zvezda engines are good for one year, and that's it. Keep repeating that; maybe you'll convince yourself, if no one else. The reboost engines are rated for 250 firings or 25,000 sec on-time, whichever comes first. I suspect that you are confusing the thrusters with the main Zvezda engines, which are permanently mothballed. |
#16
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