I'm surprised very few are saying anything about Orbital.
Quote from: clongton on 04/18/2011 03:03 pmBut I don't think you are alone in having a favorable opinion of Liberty. I would be interested in your reasoning.In a nutshell, the reason that I prefer Liberty over Atlas V is because:A) Liberty is a "simple" rocket, which does exactly what it says on the tin (launch to LEO, nothing else). One of my favourite sayings: "The simpler a plan is, the less things can go wrong". B) A lot less work is required to man-rate Liberty than to man-rate Atlas V, since both Liberty's SRB and 2nd stage were designed with crew in mind.C) The support for Liberty is mostly already in place. For example, a new gantry would need to be constructed for Atlas V in order to allow for crew access, whereas Liberty would use the Ares I ML.
But I don't think you are alone in having a favorable opinion of Liberty. I would be interested in your reasoning.
All of the above would likely make Liberty ready to fly crew before Atlas V.
And I'll quickly back chuck's argument and direct people to this thread on the issue at hand:http://forum.nasaspaceflight.com/index.php?topic=24209.0
Hmm. And what is going to be different with this SRB than the Ares-I wrt the thrust oscillation issue? All that TO was shown to be pretty much a crew-killer. I have no difficulty using it for cargo only, but not for crew. It would be dead-man-walking according to all the analysis documentation that has been collected.
Quote from: robertross on 04/18/2011 04:44 pmAnd I'll quickly back chuck's argument and direct people to this thread on the issue at hand:http://forum.nasaspaceflight.com/index.php?topic=24209.0With respect, I'll quickly advise you that you're backing up a claim that TO can kill a crew via a 15 page presentation which does not, in any way at all, back or even intimate such a threat.This is Chuck's claim:QuoteHmm. And what is going to be different with this SRB than the Ares-I wrt the thrust oscillation issue? All that TO was shown to be pretty much a crew-killer. I have no difficulty using it for cargo only, but not for crew. It would be dead-man-walking according to all the analysis documentation that has been collected. That claim is wrong - something I can say with confidence as I know the LEAD engineer on TO for the purpose of this article: http://www.nasaspaceflight.com/2008/12/ares-i-thrust-oscillation-meetings-encouraging-allowance-for-changes/ - and who's since been a member of this site and actually cited encouraging data post I-X.Thus a response of "but I was talking about the Ares I-X data" won't work either, because the 15 page presentation you've linked DOES NOT make any claims TO will kill the crew... mainly because doesn't even make any claims anyway, because that's a sanitized NTRS presentation The full information is ITAR'ed - thus not available for L2 acquisition, but as mentioned, it's not ITAR'ed for the lead engineer to say it was encouraging, which he did.Want to find hidden assumptions of killing a crew in that presentation, let's continue to post on that link so as not to distract this thread any further
Quote from: OV-106 on 04/18/2011 04:22 pmI'm surprised very few are saying anything about Orbital. Lack of exposure? Maybe Chris can say how good they are to deal with?And I agree with Chris. ATK are the monster in the room. Can't count them out.
In a nutshell, the reason that I prefer Liberty over Atlas V is because:A) Liberty is a "simple" rocket, which does exactly what it says on the tin (launch to LEO, nothing else). One of my favourite sayings: "The simpler a plan is, the less things can go wrong". B) A lot less work is required to man-rate Liberty than to man-rate Atlas V, since both Liberty's SRB and 2nd stage were designed with crew in mind.C) The support for Liberty is mostly already in place. For example, a new gantry would need to be constructed for Atlas V in order to allow for crew access, whereas Liberty would use the Ares I ML.All of the above would likely make Liberty ready to fly crew before Atlas V.However, having said all that, by my own admittance I'm not a religious follower of new/commercial space, so I'm sure there are some things that I have overlooked.
My Top 3 in order:1) SpaceX2) Boeing -CST & Atlas V3) Dream ChaserWe get FOUR for the price of three! Three orbital vehicles and two rockets. VRTEARE327
I wouldn't fund commercial Shuttle, but I would fund the study.
I can't really see ATK getting much from this. It'd hardly be fair, considering that ULA has waaayyy more experience with rocket development, and they actually have TWO rockets already flying regularly that could be used. I can see ATK getting something, but not the lion's share. The USA proposal makes more sense, IMHO. I think "commercial Shuttle" should be studied (which I believe is what the proposal is for, a study), but based on the circumstances right now, "if I were emperor of NASA," I wouldn't fund commercial Shuttle, but I would fund the study.If ATK wants to develop a launch vehicle on their own dime (or mostly), more power to them! I'd be really surprised if they got more than a dozen million of CCDev money.I'm betting SpaceX would probably get some money (and would be happy if they do). I'd be surprised if CST-100 doesn't get anything.IMO, I really hope the lion's share goes to what ever spacecraft can be developed soonest (for a reasonable amount of money) for commercial crew. From where I stand, that looks like either Dragon or CST-100, though there can certainly be surprises. Since CCDev2 is small, I hope we put the largest chunk of funding to the project that can get the biggest bang for the buck towards bringing us to commercial crew, maximizing the return on NASA's investment. The projects which require the greatest total investment should only get token funding (if any), and the projects requiring the least total investment before real capability can be fielded should get the greatest funding.I think, though, that we may have to wait for CCDev3 for that.
Is this the "plan for the plan" mentioned by Bolden for the week or is there more to come this week?
IMO, I really hope the lion's share goes to what ever spacecraft can be developed soonest (for a reasonable amount of money) for commercial crew.
Quote from: Robotbeat on 04/18/2011 05:20 pmI can't really see ATK getting much from this. It'd hardly be fair, considering that ULA has waaayyy more experience with rocket development, and they actually have TWO rockets already flying regularly that could be used. I can see ATK getting something, but not the lion's share. The USA proposal makes more sense, IMHO. I think "commercial Shuttle" should be studied (which I believe is what the proposal is for, a study), but based on the circumstances right now, "if I were emperor of NASA," I wouldn't fund commercial Shuttle, but I would fund the study.If ATK wants to develop a launch vehicle on their own dime (or mostly), more power to them! I'd be really surprised if they got more than a dozen million of CCDev money.I'm betting SpaceX would probably get some money (and would be happy if they do). I'd be surprised if CST-100 doesn't get anything.IMO, I really hope the lion's share goes to what ever spacecraft can be developed soonest (for a reasonable amount of money) for commercial crew. From where I stand, that looks like either Dragon or CST-100, though there can certainly be surprises. Since CCDev2 is small, I hope we put the largest chunk of funding to the project that can get the biggest bang for the buck towards bringing us to commercial crew, maximizing the return on NASA's investment. The projects which require the greatest total investment should only get token funding (if any), and the projects requiring the least total investment before real capability can be fielded should get the greatest funding.I think, though, that we may have to wait for CCDev3 for that.If you don't intend to commercialize the Shuttle, why would you spend funds studying it?...
Because I am willing to admit that I could be wrong. Unlike some people, when the facts change (or my awareness of the facts change), I change my opinion. By funding the study, I would find out if I'm wrong or not. It's also a backup plan. Worst case, we go to commercial Shuttle (though it may be too late by then).
Quote from: yg1968 on 04/18/2011 05:30 pmQuote from: Robotbeat on 04/18/2011 05:20 pmI can't really see ATK getting much from this. It'd hardly be fair, considering that ULA has waaayyy more experience with rocket development, and they actually have TWO rockets already flying regularly that could be used. I can see ATK getting something, but not the lion's share. The USA proposal makes more sense, IMHO. I think "commercial Shuttle" should be studied (which I believe is what the proposal is for, a study), but based on the circumstances right now, "if I were emperor of NASA," I wouldn't fund commercial Shuttle, but I would fund the study.If ATK wants to develop a launch vehicle on their own dime (or mostly), more power to them! I'd be really surprised if they got more than a dozen million of CCDev money.I'm betting SpaceX would probably get some money (and would be happy if they do). I'd be surprised if CST-100 doesn't get anything.IMO, I really hope the lion's share goes to what ever spacecraft can be developed soonest (for a reasonable amount of money) for commercial crew. From where I stand, that looks like either Dragon or CST-100, though there can certainly be surprises. Since CCDev2 is small, I hope we put the largest chunk of funding to the project that can get the biggest bang for the buck towards bringing us to commercial crew, maximizing the return on NASA's investment. The projects which require the greatest total investment should only get token funding (if any), and the projects requiring the least total investment before real capability can be fielded should get the greatest funding.I think, though, that we may have to wait for CCDev3 for that.If you don't intend to commercialize the Shuttle, why would you spend funds studying it?...Because I am willing to admit that I could be wrong. Unlike some people, when the facts change (or my awareness of the facts change), I change my opinion. By funding the study, I would find out if I'm wrong or not. It's also a backup plan. Worst case, we go to commercial Shuttle (though it may be too late by then).
Then you need to fund Boeing. With the experience and workforce they have they should be finished before all other...
(Don't get me wrong -- I'm an admirer of the work that Boeing has done over the years, but they're engineers -- not magicians!)