Кто-то знает в какие времии стартувует третий ступень РН "Союз" (11А511) ? В французком книге, я нащел "T+300 с"...
Спасибо!
Да, правильно.
Для 11А511У
285,05 - Главная команда II ступени
287,29 - Разделение II и III ступени
305,78 - Сброс хвостового отсека III ступени
Это циклограмма пилотируемого "Союза-У"
(I go on in English because it is very hard for me to write in Russian with my computer... But you can answer in Russian!)
My problem is : on Videocosmos's website (http://www.videocosmos.com/soyuz18a.shtm), they say that the Soyouz 18-1 spacecraft was ejected at T+295 s.
But in the book "Soyuz, a Universal Spacecraft", they say that the craft was ejected four seconds after the ignition of 3rd stage (so, theorically, at T+304 s)...
Do you have informations about that?
I think it was even later because flight abort happened after the vehicle lost it's orientation (7 degree from nominal). It happened after failure to jettison aft section of III-d stage shroud (3 panels separated and one did not). More likely it was 310th second of the flight
I've read that the safety limit was 10°...
What is this "III-d stage shroud" ???
The IIId stage engine RD-0110 and all aft spherical section of the tank is protected with jettisonable cylindrical construction, it's weight is somewhat ~350 kg. It is separated from the IIId stage at T+305,78. It consists of 4 panels with their latches.
(http://kluz.gfns.net/samara.jpg)
Jettisonable section is painted orange - just below letters "СОЮЗ"
And at T+305,78, is the interface between II/III stage jettisonned too?
Or is the interface ejected earlier?...
Well, to avoid weightlessness effects, IIId stage engine starts at the same time when IInd stage engine is cut off - at T+285,05. And more than two seconds IInd and 3d stages are pulled with IIId stage engine. Then at T+287,29 IIId stage is separated from the empty IInd, and, later, aft shroud is separated at T+305.
As for Soyuz-18-1 incident, different sources offer different versions.
Some even tell that 3 latches were released before nominal T+287,29 making a big eccentricity of pulled IInd stage. Other say separation of the second stage went nominally but aft shroud failed to separate. This gives us substantially different time of the launch abort event.
Look at this picture:
(http://kluz.airbase.ru/11a511sm.gif)
ЦитироватьWell, to avoid weightlessness effects, IIId stage engine starts at the same time when IInd stage engine is cut off - at T+285,05. And more than two seconds IInd and 3d stages are pulled with IIId stage engine. Then at T+287,29 IIId stage is separated from the empty IInd, and, later, aft shroud is separated at T+305.
But at which moment does the interface section separate ? What I call the interface section is this : http://www.kosmonavtika.com/2.jpg
ЦитироватьSome even tell that 3 latches were released before nominal T+287,29 making a big eccentricity of pulled IInd stage. Other say separation of the second stage went nominally but aft shroud failed to separate.
All my documents say that the failure was due to a problem with the interface section...
According to them, a mechanical shock did prevent the interface section from being separated, and thus the II stage AND the interface section were still attached to III stage during the separation of Soyouz...
ЦитироватьLook at this picture:
(http://kluz.airbase.ru/11a511sm.gif)
Do you have a higher resolution version of this very interesting graphic?
ЦитироватьBut at which moment does the interface section separate ? What I call the interface section is this : http://www.kosmonavtika.com/2.jpg
T+287,29
ЦитироватьAll my documents say that the failure was due to a problem with the interface section...
According to them, a mechanical shock did prevent the interface section from being separated, and thus the II stage AND the interface section were still attached to III stage during the separation of Soyouz...
It looks very likely but one point - the real excentricity in this case would cause 7 deg error in less than 0,5 second, not 4 seconds.
ЦитироватьLook at this picture:
ЦитироватьDo you have a higher resolution version of this very interesting graphic?
Yes and I can send it to you by e-mail