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#40
by
edkyle99
on 14 Feb, 2014 16:13
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Does anybody know what is the purpose of intermediate orbit (270x5000x50.3°)? Why not burn directly from parking orbit into ~180x35786x51.5°? This sounds more efficient since we can take advantage of Oberth effect. The only reason I can think of is phasing (ensuring appropriate LAN). Also - why target orbit is inclined (picture shows 12.7° inclination)? Shouldn't GSO be equatorial? Or satellite is expected to do off-plane GSO insertion burn itself?
The Briz M fourth stage is powered by an Isayev S5-98M engine that only produces about 2 tonnes thrust. It takes more than
50 minutes for that small thrust engine to burn through all of the propellant in the stage and in its extra drop tank. There simply isn't enough time near perigee for the stage to perform an efficient single burn, so the work is broken up into several passes. The last two burns take place after the drop tank has been jettisoned.
- Ed Kyle
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#41
by
Chris Bergin
on 14 Feb, 2014 16:28
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Going to need you guys to cover this one. My internet is all over the place with the country in a mess. I'll get an article on for it of course.
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#42
by
edkyle99
on 14 Feb, 2014 16:39
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Hang in Chris. Spring is coming. I saw it yesterday in Iowa. Sunlight and warm air. Who knew?
Here's a bit of fun from the roll out video. This has to be the world's coolest train.
- Ed Kyle
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#43
by
Satori
on 14 Feb, 2014 18:09
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T-2h All personnel should be in their final positions for launch.
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#44
by
Satori
on 14 Feb, 2014 18:28
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Proton-M still with the service structure attached. It will be moved back at T-1h.
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#45
by
Prober
on 14 Feb, 2014 18:34
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#46
by
Satori
on 14 Feb, 2014 19:10
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Awful webcast from Tsenki.
Service structure was retracted...
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#47
by
Adonis1
on 14 Feb, 2014 19:27
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#48
by
Adonis1
on 14 Feb, 2014 19:29
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#49
by
satlaunch
on 14 Feb, 2014 19:30
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#50
by
Satori
on 14 Feb, 2014 19:45
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At T-35m the LV GN&C GLSTE armed the launch abort systems. Readiness green indicator light illuminated on the launch abort unit front panel. Two redundant displays on the launch abort unit erre synchronized to the CD clock and start countdown. SC launch unit abort switch is now active.
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#51
by
Chris Bergin
on 14 Feb, 2014 19:47
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ILS coverage has begun. My internet is behaving at the moment, so I'll do what I can, but a joint effort ensures if one of us falls over (i.e. me) then we're covered.
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#52
by
Chris Bergin
on 14 Feb, 2014 19:48
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Hi Jennifer!
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#53
by
Chris Bergin
on 14 Feb, 2014 19:49
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#54
by
input~2
on 14 Feb, 2014 19:49
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#55
by
Chris Bergin
on 14 Feb, 2014 19:50
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Chilly! Proton doesn't care.
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#56
by
Satori
on 14 Feb, 2014 19:53
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#57
by
Satori
on 14 Feb, 2014 19:54
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#58
by
Satori
on 14 Feb, 2014 19:55
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#59
by
Chris Bergin
on 14 Feb, 2014 19:59
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Absolutely love the accent of the lady who narrates the mission profile. #Swoon
