Thanks!I've read an article recently and notice that SpaceX chills the RP-1 from ambient temperature down to approximately -7°C. What method do they employ to chill the RP-1? And I want to clarify did I understand correctly if they have ambient temperature for example +20°C they will chill down the RP-1 till +13°C or they will chill it down to -7°C?
@lukealization yes, from 70F to 20 F
The LOX sphere at SLC-40 is from Apollo. SpaceX salvaged it.
Quote from: jpo234 on 11/05/2017 06:48 pmThe LOX sphere at SLC-40 is from Apollo. SpaceX salvaged it. is it one from SLC-34 or SLC-37 Pad A/Pad B??
Quote from: Alesandro on 11/05/2017 07:16 pmThanks!I've read an article recently and notice that SpaceX chills the RP-1 from ambient temperature down to approximately -7°C. What method do they employ to chill the RP-1? And I want to clarify did I understand correctly if they have ambient temperature for example +20°C they will chill down the RP-1 till +13°C or they will chill it down to -7°C?https://twitter.com/elonmusk/status/677666779494248449Quote@lukealization yes, from 70F to 20 F20F is -6,66667°C, so the -7°C is about right.
Quote from: jpo234 on 11/05/2017 07:56 pmQuote from: Alesandro on 11/05/2017 07:16 pmThanks!I've read an article recently and notice that SpaceX chills the RP-1 from ambient temperature down to approximately -7°C. What method do they employ to chill the RP-1? And I want to clarify did I understand correctly if they have ambient temperature for example +20°C they will chill down the RP-1 till +13°C or they will chill it down to -7°C?https://twitter.com/elonmusk/status/677666779494248449Quote@lukealization yes, from 70F to 20 F20F is -6,66667°C, so the -7°C is about right.Thank you for the link!Unfortunately, Elon did not answer about the equipment for chilled RP-1. Do you have any conjectures how he chills RP-1?
How RP1 is chilled is off topic.
http://www.floridatoday.com/story/tech/science/space/2017/12/05/spacex-now-targeting-dec-12-launch-iss-supplies-ksc/922714001/From December 4th to December 8th to December 9th too now December 12th hopefully we get to see this launch soon. Hopefully.
Quote from: SPITexas on 12/05/2017 03:50 pmhttp://www.floridatoday.com/story/tech/science/space/2017/12/05/spacex-now-targeting-dec-12-launch-iss-supplies-ksc/922714001/From December 4th to December 8th to December 9th too now December 12th hopefully we get to see this launch soon. Hopefully.LC-40 was supposed to be available in August, if you recall. Then September...Good thing LC-39A was up and running, or there would have been zero or one East Coast launch in 2017.
If LC-39A was not ready you would have seen them really move rapidly on SLC-40. Since they had a back-up every indication is that they did not just rebuild it, but made a lot of improvements to it. Rebuilding something exactly how it was it relatively easy and fast. All the design work is done you just have to clear out the damage, repair and replace. The key driver will be the re-manufacture of parts. Improving the pad as you go takes time; since first you have to complete the new design, then manufacturer parts and finally install them.
If the improvements get them to a two-week cadence* instead of the three to four week one prior to AMOS, then the extra effort will quickly pay for itself.* Potentially one week when static fires go away with Block 5 reflights.
Quote from: AncientU on 12/05/2017 10:21 pmIf the improvements get them to a two-week cadence* instead of the three to four week one prior to AMOS, then the extra effort will quickly pay for itself.* Potentially one week when static fires go away with Block 5 reflights.I wouldn't be surprised if they implemented lessons learned from 39A into 40 and might have gotten turnaround time to less than 2 weeks (I'd guess around 10-12 days)
At least part of the delay was the decision to work on both pads in parallel, to get LC-39A ready for FH. Another part was very likely the decision to build a very much enhanced LC-40. Initially I think the plan was to rebuild LC-40 as is as fast as possible. Maybe they switched because LC-39A worked very well after initial bugs were ironed out.Plus of course, there are always delays.