Think that was F91.1, not F9FT? Link didn't come up for me.
TBH I am not sure the distinction is that important, FH would be much cheaper than an AV 552 anyway.
Quote from: abaddon on 01/16/2016 02:10 pmThink that was F91.1, not F9FT? Link didn't come up for me.The presentation was last fall which isn't that long ago. The presentation didn't say that F9 wouldn't work. It only said that it would work on FH. But I think that implies that F9FT or the F9 not wouldn't be enough.
The F9FT wouldn't be enough according to SNC.
Quote from: abaddon on 01/16/2016 02:28 pmTBH I am not sure the distinction is that important, FH would be much cheaper than an AV 552 anyway.Not to pile on but FH has no flight history yet... Atlas V is a proven vehicle despite the price...
Quote from: Rocket Science on 01/16/2016 02:36 pmQuote from: abaddon on 01/16/2016 02:28 pmTBH I am not sure the distinction is that important, FH would be much cheaper than an AV 552 anyway.Not to pile on but FH has no flight history yet... Atlas V is a proven vehicle despite the price...It's OK to be on the conservative side and bid what you know, which would be the Atlas V. I would imagine SNC would have the ability to switch to other launchers later if they wanted, which is what Orbital ATK did.So once Falcon Heavy is deemed "mature" in the eyes of SNC, they can decide if it makes sense at that point to switch.
Is there a sense that three vendors were selected because the bids were lower than expected?Certainly a minimum of two vendors would be required to ensure parallel development streams to reduce risk of a showstopper impacting ISS viability. But the option to fund three vendors with greater diversity in technical and business strategy promotes the commercial industry on the taxpayer dime under the guise of providing generic cargo trucking to the ISS.(A number in Congress would approve, just as Congress created scheduled passenger air service with postal subsidies. At one point, the Congress mandated airmail subsidies resulted in airlines sending up to 20,000 airmail letters to themselves to pay for the flight with or without passengers - they were paid more than the postage per letter to carry them. Congress changed this, but after passengers were taking regular flights instead of hiring a plane, but that was the intention of the author of the bill, while many considered the airlines to be exploiting taxpayers.)And I approve. Three vendors doing three solutions seems like a sweet spot. Not so many as during the cold war when the dozens of military suppliers created lots of waste, but too little money to each so great products were delivered. But not the single track that gave us the shuttle with three vendors splitting block of tax money.
Quote from: yg1968 on 01/16/2016 01:25 pmThe F9FT wouldn't be enough according to SNC.They never said that it seems. Whether it can or not is a different discussion though. Anyone can take a guess on what the performance delta between an Atlas V 552 and an expendable F9FT for ISS orbit would be? This is a theoretical question of course (DC is going to fly on the 552 for CRS2).
I suspect SpaceX and Orbital undercut their CRS-1 prices (the latter already disclosed) and SNC was probably double or triple the price at least.
Quote from: Steven Pietrobon on 01/15/2016 04:37 amhttp://www.orbitalatk.com/news-room/release.asp?prid=112NASA Selects Orbital ATK for New 8-Year Contract to Deliver Cargo to the International Space StationUnder the Commercial Resupply Services-2 (CRS-2) contract, the company was awarded six initial cargo missions, valued at about $1.2-$1.5 billion, to be carried out beginning in 2019. Depending on the spacecraft/launch vehicle configurations used, these initial missions will deliver approximately 22,500-26,500 kilograms (or 49,000-58,000 pounds) of supplies and equipment to the orbiting laboratory. Later in the contract, NASA may award additional missions for the 2021-2024 period based on operational requirements of the ISS.Orbital/ATK's prices went down under CRS2. Under CRS1, the cost was $1.9B for 20mt of upmass cargo.
http://www.orbitalatk.com/news-room/release.asp?prid=112NASA Selects Orbital ATK for New 8-Year Contract to Deliver Cargo to the International Space StationUnder the Commercial Resupply Services-2 (CRS-2) contract, the company was awarded six initial cargo missions, valued at about $1.2-$1.5 billion, to be carried out beginning in 2019. Depending on the spacecraft/launch vehicle configurations used, these initial missions will deliver approximately 22,500-26,500 kilograms (or 49,000-58,000 pounds) of supplies and equipment to the orbiting laboratory. Later in the contract, NASA may award additional missions for the 2021-2024 period based on operational requirements of the ISS.
I think people may be overestimating the remaining development spending Dream Chaser has left....
Quote from: yg1968 on 01/16/2016 02:15 pmQuote from: abaddon on 01/16/2016 02:10 pmThink that was F91.1, not F9FT? Link didn't come up for me.The presentation was last fall which isn't that long ago. The presentation didn't say that F9 wouldn't work. It only said that it would work on FH. But I think that implies that F9FT or the F9 not wouldn't be enough.I totally disagree. If we believe the full thrust variant has at least 20% more performance than v1.1 (and we heard it was 30% more, right?), then a fully expendable F9FT has more performance than the Atlas V 551, and even an Atlas V 552.If he didn't say specifically that Dreamchaser wouldn't work on F9, I would assume it would work, and that it'd get just as much performance as even this Atlas V variant.Falcon 9 has /kick butt/ LEO performance.Source:http://elvperf.ksc.nasa.gov/Pages/Results.aspx(and comparing those results with public figures for Atlas V performance, like that cited list on Wikipedia which come from the Atlas V user's guide and this: http://web.archive.org/web/20120921011608/http://www.faa.gov/about/office_org/headquarters_offices/ast/media/ast_developments_concepts_2010.pdf ...I compared the performance to 51.6degrees 400km to the 185km 28 degrees performance listed above, and used the same ratio between those two numbers for Atlas V 551 and applying it to Atlas V 552 to get a first-order estimate of the 552's performance to ISS... then compared to the v1.1's given performance, and adding 20% more due to the Full Thrust enhancements)...remember that Dreamchaser's crewed variant didn't use as many SRBs on the Atlas V, which is another guarantee that Dreamchaser would be able to launch no problem on Falcon 9.
Chris, are you assuming an expendable version without legs?
Using these numbers, Orbital dropped cost per kg by about 40% and I'd suspect that SpaceX did the same plus/minus. Per kg, SNC has to get development finished to achieve parity by this measure. We need real numbers for the last two contracts (and better than a range for Orbital) to settle this.