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Posted 20 January 2014 - 18:25
Posted 20 January 2014 - 20:07
i'd like to see practical release of that scheme. my doubts were explained many times..
Posted 21 January 2014 - 19:43
SES and SpaceX: Shaking the Industry to its Roots
The Beginning of a Long-Term Relationship
Weve had extraordinary access to the analysis work that has been done, Halliwell said. Due to ITAR restrictions only U.S. citizens from SES team were allowed to gain insights of the launch vehicle. They could not tell me the outcome of the meeting, all they could do was come with a recommendation of yes, were good to go or no, were not good to go; they couldnt give me the details, he says adding that, SES team of U.S. citizens were embedded together with the SpaceX propulsion team and its been able to retire an awful lot of risk associated with this and its given us a real feel good character, he said. We crawled all over [the Falcon 9 v1.1], believe me, and were happy.
This close relationship between SES and SpaceX was key to the success of this mission as it allowed both teams to collaborate and make sure that every detail of the process met the requirements of both parties.
What is interesting with SpaceX, whenever they had a problem, we had quite a lot of visibility into it. Weve had the opportunity to be able to work together with them, which is relatively unusual, he added. Its a long-term relationship with these guys, Halliwell added.
Both Halliwell and Starkovs emphasized that their trust was based on the open relationship with SpaceX, which allow them to experience first hand, all the efforts the team made.
Were very appreciative that SES would place their faith on SpaceX. One thing I can say with certainty is that weve done everything we could possibly think of to maximize the probability of success for the mission, Musk said before the first launch attempt. The policy of SpaceX is, right up until the launch takes place, if anyone has any unresolved concerns, they can email me directly, and well put a hold on the launch and resolve whatever that issue might be.
One Launch, Many Milestones
The SES 8 launch was important to SpaceX not only because it was its first commercial satellite launch to geosynchronous orbit, opening a flurry of new business, but also because it counted toward the certification process for the U.S. Air Forces Evolved Expendable Launch Vehicle-class (EELV) program, according to Shotwell. Obtaining this certification will allow SpaceX to compete with United Launch Alliance (ULA) for national security payload launch contracts.
A successful launch with SpaceX potentially opens up a number of new possibilities for SES also. The big push that were looking for at the moment is electrical propulsion, thats the big game changer again, Halliwell said. Youll be able to launch far more complicated satellites with a much more smaller mass and thats when SpaceX really starts to come into its own.
Posted 22 January 2014 - 03:18
Parachutes are complex with numerous failure modes. Hypergolic thusters are inherently extremely reliable, which is why they're still in use after almost 70 years.
DocM, hypergolics haven't been used for powered - landing from orbit onto Earth. if you burn fuel all-way from orbit, there will be painful penalty by extra weight; if you run thrusters at the very ground (at the terminal velocity), you get too small room for backup measures. + needless to mention, it needs terminal velocity as low as possible to save propellant, only way to do that is semi-chute scheme. I.e. drogue reduces terminal velocity. perhaps semi-chutting will be quite economically reasonable solution, but pure power-landing approach looks like fantasy -- there require much more efficient engines.
Posted 29 January 2014 - 22:13
Posted 29 January 2014 - 22:35
the more sources, the more opportunity to gain first-hand info + that flight for nasa, but i meant commercial ones.
Posted 30 January 2014 - 01:20
Posted 30 January 2014 - 03:49
Posted 30 January 2014 - 03:56
Posted 30 January 2014 - 04:07
Those launches have to be booked years in advance and many are for DoD payloads larger than F9 can currently handle - plus its certification review isnt finished. FH's first certification flight isn't until 2015. Neither can be booked until certified.
Posted 30 January 2014 - 04:12
Posted 04 February 2014 - 21:58