Quote from: Cherokee43v6 on 07/23/2011 07:16 pmMy original comment was based in the idea that government would have no incentive to purchase a commercial ride so long as it has its own vehicle available. Why spend money to take a cab when you own your own car? I don't know how much it would cost SLS/MPCV per trip, but suspect that on the basis of cargo/dollar or people/dollar, that commercial will end up being cheaper. I use a pick-up truck only infrequently. When I need one, I rent one. Overall, it saves me a lot of money (depreciation, maintenance, storage, etc.). I know some people who only rent cars once in a while (It's very convenient and economical to do this in San Francisco apparently). If it came down to designing and building my own car vs. renting one that works, or hiring a taxi that works, and my track-record for building cars demonstrates that I spend a lot more than my neighbour Joe (who owns a small taxi company that is almost ready to begin economical service) I would not be likely to design and build my own car. Especially if I had lots of other stuff to do (like build telescopes and planetary missions). Until Joe's ready, I'll just keep paying through the nose for Vladimir's taxi service since it's the only option right now.
My original comment was based in the idea that government would have no incentive to purchase a commercial ride so long as it has its own vehicle available. Why spend money to take a cab when you own your own car?
Quote from: Cherokee43v6 on 07/23/2011 07:16 pmMy original comment was based in the idea that government would have no incentive to purchase a commercial ride so long as it has its own vehicle available. You must remember that NASA doesn't really care about costs, so if a commercial provider is cheaper than the NASA owned system, NASA will always choose its own system. The only solution is for NASA not to own transportation systems to orbit.
My original comment was based in the idea that government would have no incentive to purchase a commercial ride so long as it has its own vehicle available.
9 years in the USAF and never flew on a military plane. Went TDY maybe 40 times.
Hopefully a lesson well learned after the shuttle incidents. Personally, I'd prefer seeing 3 - two capsules for most payloads and DC for delicate experiment return and medical or emergency evac.
....There is now a law which puts the same restriction on NASA. The agency is required by law to use commercial transport whenever practical (once it becomes available). That doesn't mean that NASA should not own, and operate, its own transportation system to orbit. It means that NASA's system will be used when transportation to LEO is required but the commercial providers are not able to accommodate the need for any number of reasons such as no LV available for the date/time slot, orbital destination is outside the reach of the commercial system, commercial system cannot accommodate the payload for security or safety reasons, or any number of other perfectly valid reasons....
Quote from: clongton on 07/24/2011 10:54 am....There is now a law which puts the same restriction on NASA. The agency is required by law to use commercial transport whenever practical (once it becomes available). That doesn't mean that NASA should not own, and operate, its own transportation system to orbit. It means that NASA's system will be used when transportation to LEO is required but the commercial providers are not able to accommodate the need for any number of reasons such as no LV available for the date/time slot, orbital destination is outside the reach of the commercial system, commercial system cannot accommodate the payload for security or safety reasons, or any number of other perfectly valid reasons....Thanks for that clear description. I wasn't fully aware of such a law (I was vaguely aware of something along those lines).I like having more concrete facts, so I did a web search and found the law in question:Public Law 105303: http://landsat.usgs.gov/documents/PL105-303.pdfThe part to read is Title II, section 201 : "Requirement to procure commercial space transportation services."@Danderman: Maybe you need to retract your previous assertions?
the Federal Government shall acquire space transportation servicesfrom United States commercial providers whenever such servicesare required in the course of its activities. To the maximum extentpracticable, the Federal Government shall
Quote from: clongton on 07/24/2011 10:54 am....There is now a law which puts the same restriction on NASA. The agency is required by law to use commercial transport whenever practical (once it becomes available). That doesn't mean that NASA should not own, and operate, its own transportation system to orbit. It means that NASA's system will be used when transportation to LEO is required but the commercial providers are not able to accommodate the need for any number of reasons such as no LV available for the date/time slot, orbital destination is outside the reach of the commercial system, commercial system cannot accommodate the payload for security or safety reasons, or any number of other perfectly valid reasons....Thanks for that clear description. I wasn't fully aware of such a law (I was vaguely aware of something along those lines).I like having more concrete facts, so I did a web search and found the law in question:Public Law 105–303: http://landsat.usgs.gov/documents/PL105-303.pdfThe part to read is Title II, section 201 : "Requirement to procure commercial space transportation services."@Danderman: Maybe you need to retract your previous assertions?
Let’s say commercial on line in 5 years. That means after 2016, ISS will have only 4 more years of operation. Unless the station is extended to 2025-2030, is the investment worth the mission left? I’m just looking at the big picture here for commercial.RegardsRobert
Quote from: Rocket Science on 07/25/2011 08:09 pmLet’s say commercial on line in 5 years. That means after 2016, ISS will have only 4 more years of operation. Unless the station is extended to 2025-2030, is the investment worth the mission left? I’m just looking at the big picture here for commercial.RegardsRobertNo, it's not worth it.
Yes, because it's pretty unlikely that ISS will be last space station (in fact, certain given that TienGong-1 is shortly to launch).Once operational, the US commercial companies that have survived will be the cheapest seats to space in world. Thus, any governments that want to access space will either have to buy seats from them, or buy the vehicles outright (which I could imagine Japan or India doing). Either way, the seed money from CCDEV gives these companies a leg up on the post-ISS human launch market.
Quote from: docmordrid on 07/22/2011 06:34 pmHopefully a lesson well learned after the shuttle incidents. Personally, I'd prefer seeing 3 - two capsules for most payloads and DC for delicate experiment return and medical or emergency evac.Can DreamChaser stay docked to the station for six months?
Quote from: manboy on 07/24/2011 08:25 pmQuote from: docmordrid on 07/22/2011 06:34 pmHopefully a lesson well learned after the shuttle incidents. Personally, I'd prefer seeing 3 - two capsules for most payloads and DC for delicate experiment return and medical or emergency evac.Can DreamChaser stay docked to the station for six months?Yes all ccdev craft must be able to do so.
I would have a little concern about having DC TPS exposed to space for that long without some form of inspection. RegardsRobert
Quote from: Rocket Science on 07/25/2011 09:12 pmI would have a little concern about having DC TPS exposed to space for that long without some form of inspection. RegardsRobertThe Dream Chaser would be docked to a spacestation. Would a camera attached to a robotic arm be able to perform the inspection?Alternatives include: a camera with an RCS that can fly around the spacecraft, or making the Dream Chaser perform a back flip before authorising re-entry.