Quote from: Robotbeat on 01/16/2016 05:42 pmQuote 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?
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.
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.
Think that was F91.1, not F9FT? Link didn't come up for me.
Quote from: Robotbeat on 01/16/2016 05:42 pmQuote 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.Could be that by 2019, F9 (expendable) is no longer a viable ride. FH reusable will replace F9 expendable per SpaceX, because it will be less expensive.
Even if we assume $200M to $250M per resupply flight and 4 missions per year we get $800M to $1B per annum. It’s a five year flight schedule so why so much headroom in the contract (maximum 14B$). What options could there be other than more flights?Long time stalker, first time talker
Quote from: AncientU on 01/16/2016 05:47 pmUsing 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.Don't see that Orbital's price has changed that much. Orbital's original CRS1 order was $1.9B for 8 flights = $237.5M/flight. The CRS2 order is $1.2-1.5B for 6 flights = $200-250M/flight.
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.
Quote from: rayleighscatter on 01/16/2016 03:39 pmI think people may be overestimating the remaining development spending Dream Chaser has left....Or SNC is underestimating the remaining development spending left.
I think people may be overestimating the remaining development spending Dream Chaser has left....
NASA isn't buying flights they're buying upmass. OA is getting the same amount of material up to ISS in CRS2 for a third less.
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...
TBH I am not sure the distinction is that important, FH would be much cheaper than an AV 552 anyway.
Quote from: Phlebas on 01/16/2016 06:03 pmEven if we assume $200M to $250M per resupply flight and 4 missions per year we get $800M to $1B per annum. It’s a five year flight schedule so why so much headroom in the contract (maximum 14B$). What options could there be other than more flights?Long time stalker, first time talkerWe don't know how they reached that number. For reference, assuming 5 flights of the most expensive mission per year, and five years of missions for the contract, should yield us a cost of around $560M per mission. That's still too much imo, for any of the vehicles at hand...A more modest - close to life - cost of $250M per flight for 20 flights would give us a total of $5Bn for the contract, split 3 ways. That's about a billion dollars to service the ISS per year, not bad at all..
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...Sure, but it will by 2019. Also, two engine Centaur doesn't have flight history either.
Yes, DEC was the norm pre-Atlas V, but my understanding is that the new DEC would be different in some respects. I seem to recall something about changes to TVC control or some such.
The RFI said NASA plans on spending $1-1.4B per year for CRS-2. They probably chose $14B so they can get to a 2028 ISS retirement under CRS2 if they want. Look at how many extensions have been awarded under CRS-1.edit: FWIW, I believe DC missions will cost something like $430-480M each. It's not a bargain, but it fits NASA's spending profile.
Yup, because we're comparing to a really expensive Atlas V.
On another issue Kirk Shireman said that NASA got a difference price if it bought a mission a la carte as opposed to 6 at the same time. I am guessing that ULA gave SNC a discount for ordering 6 Atlas V from them.