Total Members Voted: 173
Voting closed: 06/30/2014 11:30 pm
This includes any crewed test flights to orbit, right?
I thought a man-rated Delta IV was/is out of the question?Both with the current RS-68 and structural margins being below 1.4.
Quote from: AS-503 on 01/07/2014 11:26 pmI thought a man-rated Delta IV was/is out of the question?Both with the current RS-68 and structural margins being below 1.4.Not out of the question. It's good enough for incredibly expensive and incredibly important national security assets (upon which millions of lives depend). We used to launch men on converted ICBMs, remember?
Quote from: Robotbeat on 01/07/2014 11:29 pmQuote from: AS-503 on 01/07/2014 11:26 pmI thought a man-rated Delta IV was/is out of the question?Both with the current RS-68 and structural margins being below 1.4.Not out of the question. It's good enough for incredibly expensive and incredibly important national security assets (upon which millions of lives depend). We used to launch men on converted ICBMs, remember?While I agree with all of your points, sadly they are not relevant to NASA's standards for man-rated.Historically speaking Gemini pulled about 7gs on the way up (steep trajectory) on it's converted ICBM with "black zones" almost the entire way to orbit (even including sitting on the pad). Yes, I remember, but are you really arguing for a return to this type of (non) risk-aversion?After the two STS accidents, it is a safe assumption that all manned flights (on newly designed spacecraft) should be free of black-zones with maximum *practical* abort options.
Quote from: AS-503 on 01/07/2014 11:35 pmQuote from: Robotbeat on 01/07/2014 11:29 pmQuote from: AS-503 on 01/07/2014 11:26 pmI thought a man-rated Delta IV was/is out of the question?Both with the current RS-68 and structural margins being below 1.4.Not out of the question. It's good enough for incredibly expensive and incredibly important national security assets (upon which millions of lives depend). We used to launch men on converted ICBMs, remember?While I agree with all of your points, sadly they are not relevant to NASA's standards for man-rated.Historically speaking Gemini pulled about 7gs on the way up (steep trajectory) on it's converted ICBM with "black zones" almost the entire way to orbit (even including sitting on the pad). Yes, I remember, but are you really arguing for a return to this type of (non) risk-aversion?After the two STS accidents, it is a safe assumption that all manned flights (on newly designed spacecraft) should be free of black-zones with maximum *practical* abort options.Delta IV doesn't have to have "black zones." It's a proven vehicle with a constant flight rate every year, thus I'd argue it is and will always be safer than any vehicle NASA would field.
I'm betting SpaceX 1Q 2016. To achieve this they will make it a priority over FH. This is what Dragon was designed for. It will give them a solid "first mover" advantage in the crew transportation market. And it will keep them visibly progressing towards their corporate Über-Goal.