I see several flaws in this argument.First:1) We have been launching 4 shuttles carrying 7 people a year.2) NASA has said they want 4 crew per mission not 7.So this leads to 7 flights of 4 crew a year not 2 flights a year to replace the shuttle flights. Second there are cargo missions as well.All the crew vehicles can carry cargo as well as crew.Several of which has interesting capabilities such as the Dragon trunk and the CST-100 ability to carry fuel. The total for both could reach 16-24 launches a year for full use by 2020.Third we have a total of 5 crew and cargo vehicles in development not all these vehicles will succeed.
Astronauts will only be sent to the ISS for 6 months stays. There will no longer be any need to send astronauts on short term flights to assemble the ISS. NASA anticipates buying 2 or 3 flights per year with 4 astronauts on each flight.
IMHO Commercial Crew will not be a train wreck, because it's not an all or nothing system like the Shuttle.
The biggest risk I see is that commercial crew is dependent upon ISS to supply the initial demand, even as we put ISS at greater risk by retiring the shuttle. Even under the best of circumstances, assuming that commercial crew doesn't suffer significant delays, the overlap between the first CCDEV flights and ISS retirement is only a few years. That overlap could disappear quickly.
Quote from: Gregori on 07/02/2011 10:32 pm1. That low amount can barely support one provider never mind two or three! This will not result in a competitive market and will likely end up having one provider for the capability.2. This combination of few missions and few providers will make it very expensive per flight, possibly as high as shuttle.3. Commercial Cargo under COTS was not cheap, so I doubt human spaceflight is going to be significantly cheaper, esp since the vehicles are far more complex than the cargo ships like Dragon and Cygnus.1. So what?2. No, it won't be "very" expensive or even close to the shuttle3. How is it "not cheap"?
1. That low amount can barely support one provider never mind two or three! This will not result in a competitive market and will likely end up having one provider for the capability.2. This combination of few missions and few providers will make it very expensive per flight, possibly as high as shuttle.3. Commercial Cargo under COTS was not cheap, so I doubt human spaceflight is going to be significantly cheaper, esp since the vehicles are far more complex than the cargo ships like Dragon and Cygnus.
I think people forget that in about 5 years there could start to be multiple commercial stations in space.
Quote from: Gregori on 07/02/2011 11:21 pm NASA will be locked into paying whatever these companies charge for the service.Again, so what? It will be cheaper than a NASA managed system
NASA will be locked into paying whatever these companies charge for the service.
Robert Bigelow, Elon Musk, and others have sunk *quite* a bit of their own wealth assuming that there will in fact be a multitude of other customers, along with crew and cargo to ISS supporting their business case a good deal. You might want to check out the NASA study on markets for crew and cargo which deals with much of this.
I'd be quite interested in seeing the evidence for your claim that commercial cargo is "not cheap", as all the data I've seen has it providing upmass at prices far lower than almost any other competitor. If you're referring to a certain document issued during a Congressional hearing, jongoff posted a nice rebuttal of its numbers, which appear to be couched in fantasy more than anything else.
Quote from: Diagoras on 07/03/2011 05:49 amRobert Bigelow, Elon Musk, and others have sunk *quite* a bit of their own wealth assuming that there will in fact be a multitude of other customers, along with crew and cargo to ISS supporting their business case a good deal. You might want to check out the NASA study on markets for crew and cargo which deals with much of this. Yes. This could be a terrible assumption. It won't be the first time millions was wasted on overly optimistic assumptions. Nobody seems to be questioning, what if this stuff doesn't pan out? What people desire to happen most is not actually the most likely outcome.
QuoteI'd be quite interested in seeing the evidence for your claim that commercial cargo is "not cheap", as all the data I've seen has it providing upmass at prices far lower than almost any other competitor. If you're referring to a certain document issued during a Congressional hearing, jongoff posted a nice rebuttal of its numbers, which appear to be couched in fantasy more than anything else. Just look at the numbers. They're evidence enough. I am not referring to congressional reports.
Quote from: mr. mark on 07/03/2011 06:50 pmI think people forget that in about 5 years there could start to be multiple commercial stations in space.Until I see evidence to the contrary, I put pie in the sky visions of Bigelow tourist stations in the same category as flying cars and SSTO spaceplanes on the near-term likelihood scale.