is there a scenario where they'd just mothball the last 1.1?
Quote from: dorkmo on 07/31/2015 05:12 pmis there a scenario where they'd just mothball the last 1.1?SpaceX had to keep a v1.0 until they launched 3 of v1.1 before NASA would allow a switch to using v1.1 for the launch. Potentially they could mothball it, but that would be a very expensive and needless throwaway, and would be an additional delay of Jason-3 and others.
Quote from: Kabloona on 07/30/2015 05:53 pmSo...which payload wants to step up and go first? Place your bets.ISS resupply.
So...which payload wants to step up and go first? Place your bets.
Quote from: solartear on 08/01/2015 05:03 pmQuote from: dorkmo on 07/31/2015 05:12 pmis there a scenario where they'd just mothball the last 1.1?SpaceX had to keep a v1.0 until they launched 3 of v1.1 before NASA would allow a switch to using v1.1 for the launch. Potentially they could mothball it, but that would be a very expensive and needless throwaway, and would be an additional delay of Jason-3 and others.Are you sure about that? I thought they just gambled the contract on the success of V1.1. What did they do with the old 1.0 core? I thought that the Jason-3 "uproar" was over the fact that SpaceX didnt have a back up plan.
Anyone know how major the changes to the pads and ground support equipment are between the V1.1 and V1.2? If they are not too bad and can be reversed then a V1.2 could fly the RTF and Jason-3 could fly afterwards on it's original rocket. Otherwise NASA will either have to be okay with Jason-3 flying the RTF or flying a bit later on the V1.2. I doubt SpaceX would or could build another v1.1 for the RTF just to satify Jason-3. I am sure SpaceX would like to use that last V1.1 too. They already built it, writing it off basically means that one rocket failure took out two rockets.
This isn't going up on RTF but NASA recently posted a few new pics of IDA -2.
The pad difference should be minimal or none. Possible exceptions being 1) additional equipment to chill RP-1 (for v1.2).
Quote from: Lars-J on 08/04/2015 01:53 amThe pad difference should be minimal or none. Possible exceptions being 1) additional equipment to chill RP-1 (for v1.2).Apologies if I've missed something somewhere.. but what benefit does chilling RP-1 bring and what sort of temperatures are we talking about here?
Quote from: CameronD on 08/04/2015 03:04 amQuote from: Lars-J on 08/04/2015 01:53 amThe pad difference should be minimal or none. Possible exceptions being 1) additional equipment to chill RP-1 (for v1.2).Apologies if I've missed something somewhere.. but what benefit does chilling RP-1 bring and what sort of temperatures are we talking about here?Densification - you get more of it in the same volume.
Quote from: Lee Jay on 08/04/2015 03:06 amQuote from: CameronD on 08/04/2015 03:04 amQuote from: Lars-J on 08/04/2015 01:53 amThe pad difference should be minimal or none. Possible exceptions being 1) additional equipment to chill RP-1 (for v1.2).Apologies if I've missed something somewhere.. but what benefit does chilling RP-1 bring and what sort of temperatures are we talking about here?Densification - you get more of it in the same volume.Thanks for the clarification. I would not have thought it was worth it for such a small gain, but I guess every little bit counts when aiming for max performance.
NASA study on it with respect to being used in X-33 here: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20100035154.pdf
Quote from: notsorandom on 08/03/2015 05:10 pmAnyone know how major the changes to the pads and ground support equipment are between the V1.1 and V1.2? If they are not too bad and can be reversed then a V1.2 could fly the RTF and Jason-3 could fly afterwards on it's original rocket. Otherwise NASA will either have to be okay with Jason-3 flying the RTF or flying a bit later on the V1.2. I doubt SpaceX would or could build another v1.1 for the RTF just to satify Jason-3. I am sure SpaceX would like to use that last V1.1 too. They already built it, writing it off basically means that one rocket failure took out two rockets.Jason-3 will most likely fly on the last v1.1 from Vandenberg. Whatever is flying from Florida (which will most likely be the first flight) will go on v1.2. There is no conflict between the two.
Thanks for the clarification. I would not have thought it was worth it for such a small gain, but I guess every little bit counts when aiming for max performance.
Quote from: CameronD on 08/04/2015 03:46 amThanks for the clarification. I would not have thought it was worth it for such a small gain, but I guess every little bit counts when aiming for max performance.Reading Kabloona's links, it looks like there's a 10% gain from chilling the liquid oxygen and a 5% gain from the RP-1. Theyre also stretching the RP-1 tank.