3
$\begingroup$

This question is related to reuse possibilities. One of the things that affects reuse is thermal cycling of the fuel tanks. (Consider how microfractures in the X-33 composite tank killed that project. Ok, political lack of will killed it, but that was the excuse).

Thus the question. With the DSCOVR Falcon 9 launch, Feb. 2015, we saw the core do the following fuel/defuel events:

  • McGregor testing: 1 fuel/burn it out. (We know they are all tested with a burn at Texas site)
  • Wet dress rehearsal: 1 fuel/defuel, 1-3 second burn.
  • First attempt, Feb. 8: 1 fuel/defuel
  • Second attempt, Feb. 10: 1 fuel/defuel
  • Third attempt, Feb. 11: 1 fuel (hopefully 1 launch, recovery, and eventually reuse).

Which F9 core has done the most of these cycles? There have been lots of scrubs, delays, tests, failed wet rehearsals, etc.

$\endgroup$
  • 3
    $\begingroup$ Surely it would be the F9R Dev 1 (Grasshopper v1.1). Any particular reason why you're excluding that one? $\endgroup$ – TildalWave Feb 10 '15 at 23:45
  • $\begingroup$ @TildalWave I did not think of that one. Though I would say GH1 was fueled more times than GH2. $\endgroup$ – geoffc Feb 11 '15 at 2:13
  • 1
    $\begingroup$ According to en.wikipedia.org/wiki/Grasshopper_%28rocket%29, GH1 flew 8 times. I would presume that it also underwent an acceptance test, so there's 9 propellant cycles. F9R dev 1 flew 5 times before it self-destructed, so assuming it also underwent an acceptance test, there's 6 times for the 1.1 architecture. I'm not sure about specific missions that might have required more cycles due to scrubs, like the DSCOVR mission you pointed out. $\endgroup$ – Nickolai Feb 12 '15 at 19:45
  • $\begingroup$ @Nickolai Make that an answer! We can build on that answer. $\endgroup$ – geoffc Feb 12 '15 at 19:53
1
$\begingroup$

Building on TidalWave's observation, I've found the following from wikipedia:

Grasshopper 1.0 flew 8 times. I would presume that it also underwent an acceptance test, so there's 9 propellant cycles.

F9R dev 1 flew 5 times before it self-destructed, so assuming it also underwent an acceptance test, there's 6 times for the 1.1 architecture.

I'm not sure about specific missions that might have required more cycles due to scrubs, like the DSCOVR mission you pointed out.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.