rarchimedes
56p156 comments posted · 3 followers · following 0
7 years ago @ The Space Review: essa... - The Space Review: Spac... · 0 replies · +2 points
7 years ago @ The Space Review: essa... - The Space Review: Spac... · 1 reply · +3 points
7 years ago @ The Space Review: essa... - The Space Review: Spac... · 0 replies · +2 points
Frankly, your description of the cross-range requirement was the most cogent I have seen. It still does not justify the monstrosity that the shuttle became. There were many other choices other than wings. What you have made clear is that the shuttle basically destroyed all other lines of development until the EELV program and as it turned out, that was anything but forward looking. The SSME and the RL-10, though wonderful engines, are very old technology and expensive to boot. I won't comment further on the use of Russian engines as it speaks for itself. Boeing can't put the CST-100 into orbit without that Russian engine or a very expensive Delta IV.
Now we are trying to produce new engines, but despite the fact that they are methane based, they are essentially modified copies of what we already have. At the time the shuttle shut down all other lines of development, it is my understanding that we had whole series of tests on aerospike engines up to a level of 250,000 lbs. of thrust and for extended firings( (http://boeing.mediaroom.com/2001-08-10-Boeing-and-NASA-Complete-Dual-Aerospike-Engine-Tests)(http://boeing.mediaroom.com/2001-08-10-Boeing-and-NASA-Complete-Dual-Aerospike-Engine-Tests)(https://en.wikipedia.org/wiki/Aerospike_engine)). Aerospike engines appear to weigh a fraction of conventional rockets and have no need for special bells to function in atmosphere and in vacuum. I can only assume that all that expertise has long disappeared, requiring a relearning process. Considering how little funding that it had in the first effort, one would think that redevelopment could only cost a few billion, even at current efficiencies. Hopefully NASA or whichever group did the first work can dig out their archives to short circuit the process.
To speak to your final proposal, "let the best program win and the other guy will become a user", I find that admirable but unlikely. It is hard to get Congress to fund any decent program let alone competing ones. Maybe we can get Congress to put out enough for a private competition, with the winner getting the contract for enough rockets to pay off the cost of development. Now I'm dreaming out loud and should be scolded for such foolishness. Instead, Congress is feeding the current monopoly funds to develop a new engine for ULA's new Vulcan rocket, most of which is being gifted to them by a billionaire who has far more funds than Elon. It still is not carrying us forward.
7 years ago @ The Space Review: essa... - The Space Review: Spac... · 1 reply · +2 points
To get back to the basic decision to build the shuttle, there is no set of physics that can justify shoving around 250,00 pounds into orbit and returning at least 200,000, which is a very basic description of the shuttle at its most efficient level. Most of the time it had payloads that were nowhere near its maximum in either size or mass, but it had wings. As I have said before, quit defending the indefensible.
The way to have DOD and NASA work together is to give them a fixed budget and tell them that all their careers depend on their effective and efficient performance of projects, with major documentation needed for overruns. The project teams would be separated from any other command than the project lead.
7 years ago @ The Space Review: essa... - The Space Review: Blas... · 0 replies · +1 points
7 years ago @ The Space Review: essa... - The Space Review: Revi... · 0 replies · +1 points
7 years ago @ The Space Review: essa... - The Space Review: Blas... · 0 replies · +1 points
Every effort has been made to disadvantage SpaceX without appearing to actually do so. By ordinary standards, SpaceX should be completely dominating the launch business and driving their competitors to either match them or go out of business. Even with the occasional failure, SpaceX is far less expensive, and the only thing sustaining the competition is the government in the form of the DOD and NASA. If they want true competition and a lively and healthy launch market entirely dominated by the USA, SLS/Orion should be cancelled and the government owned technology, such as it is, turned over to all the remaining launch companies for free. Then, use half of that funding for developing for BEO payloads and the rest for competitive contracts for required technology development for a permanent presence in space. Maintain the ISS until it can be replaced by a maintenance, construction, assembly, and refueling facility for BEO missions and the aforementioned permanent presence. With companies like Bezos and Elon have and others, and the remains of ULA when it has bankrupted or split up or really consolidated, there should be a rich competitive marketplace to sustain our space efforts for NASA and the DOD.
7 years ago @ The Space Review: essa... - The Space Review: Blas... · 2 replies · +2 points
The statement above about attacks on any failure is absolutely correct. It is as if SpaceX deliberately failed to design their rocket and their testing procedures to catch this problem. As if any set of persons would do such. Nonsense. We all await the resolution of this hiccup. Problem it is, disaster it isn't.
7 years ago @ The Space Review: essa... - The Space Review: Blas... · 0 replies · 0 points
7 years ago @ The Space Review: essa... - The Space Review: Blas... · 0 replies · +2 points
The already proven pad abort capability of the Dragon V2 should relieve most worries that people have thrown up about this occurrence for crew operations. I suspect that the cause of this will turn out to be relatively simple and may not be in the rocket at all, so the main delay in further flights will be due to reconstruction of the launch facilities. No matter how you slice it, riding a rocket is like putting a saddle on a bomb.