Countdown to launchhttp://fanfun.jaxa.jp/countdown/epsilon/index.html
Quote from: input~2 on 08/24/2013 03:12 pmCountdown to launchhttp://fanfun.jaxa.jp/countdown/epsilon/index.htmlEasy to figure out the launch time with this link.
JAXA has just released a press kit on the rocket and the SPRINT-A telescope - unfortunately only in Japanese at this moment.
Quote from: Galactic Penguin SST on 08/26/2013 11:42 amJAXA has just released a press kit on the rocket and the SPRINT-A telescope - unfortunately only in Japanese at this moment. Nice!Just to confirm my understanding: the third stage and the PBS stageseparate (at T+16:48) so the PBS stage is indeed a separate stage and not just an RCS system that stays attached to the KM-V2b?The one crucial thing that seems to be missing from this kit is the empty mass of the PBS stage (and attached payload adapter?) in orbit - do you happen to have that info?
Quote from: jcm on 08/26/2013 12:58 pmQuote from: Galactic Penguin SST on 08/26/2013 11:42 amJAXA has just released a press kit on the rocket and the SPRINT-A telescope - unfortunately only in Japanese at this moment. Nice!Just to confirm my understanding: the third stage and the PBS stageseparate (at T+16:48) so the PBS stage is indeed a separate stage and not just an RCS system that stays attached to the KM-V2b?The one crucial thing that seems to be missing from this kit is the empty mass of the PBS stage (and attached payload adapter?) in orbit - do you happen to have that info?Google Translate of the document says that the PBS is "separated from the three-stage motor in the rear end", then mentions use of a "Maruman separation adapter". - Ed Kyle
Right, by which I assume they mean a Marman clamp!(which I recently learnt was invented by Zeppo Marx)
Quote from: jcm on 08/26/2013 03:06 pmRight, by which I assume they mean a Marman clamp!(which I recently learnt was invented by Zeppo Marx)Marx's company produced the clamp, and "Zeppo" was the first to jump at the idea and he almost certainly refined the product, but an independent inventor reportedly brought the concept to him. I have yet to find the original inventor's name, but he was described by Mr. Marx has having been flat broke with holes in his shoes, etc.. - Ed Kyle
I noticed something in the animations of stage ignition. In both the second and third stage ignition sequences, after nozzle extension but before ignition, something appears to be ejected from the nozzle. Any ideas what this is? Something generally used in solids, or perhaps just artistic licence in the animation?
Quote from: Da Vinci on 08/26/2013 11:58 pm I noticed something in the animations of stage ignition. In both the second and third stage ignition sequences, after nozzle extension but before ignition, something appears to be ejected from the nozzle. Any ideas what this is? Something generally used in solids, or perhaps just artistic licence in the animation?jettisonable igniter plug.
Quote from: Fuji on 08/27/2013 12:30 amQuote from: Da Vinci on 08/26/2013 11:58 pm I noticed something in the animations of stage ignition. In both the second and third stage ignition sequences, after nozzle extension but before ignition, something appears to be ejected from the nozzle. Any ideas what this is? Something generally used in solids, or perhaps just artistic licence in the animation?jettisonable igniter plug.Apparently it also assists the extension of the nozzle too - never seen such a design before anywhere!See how it works at http://jda.jaxa.jp/result.php?lang=e&id=d4fe91c7cd31f9062f91e3ed5d407550.
