How about a different approach /Let's assume a F-1X can be manufactured cheaper than 2 RD-180s.If ULA ever gets to that Common Core / Atlas Phase 2 idea, would it be better to use a single F-1X engine instead of the RD-180s ?
Quote from: Lurker Steve on 09/26/2013 05:55 pmHow about a different approach /Let's assume a F-1X can be manufactured cheaper than 2 RD-180s.If ULA ever gets to that Common Core / Atlas Phase 2 idea, would it be better to use a single F-1X engine instead of the RD-180s ?The RD-180 has significant more isp and about same T/W. Consider that current Phase 2 concepts still use SRB for thrust augmentation. Thus, the core works a bit like a sustainer. F-1B works best for no thrust agumented core and high T/W.
You guys are still OT. You have hijacked the thread. No one has even remotely addressed the question that the thread is about. The question is not about Pyrios, it is about DUUS. I am curious to know whether DUUS is appropriately sized such that it could serve as the US on top of Pyrios, and if not whether slight modifications could make it work.I have no interest in discussing Atlas, Delta, or Falcon. If NASA winds up building or purchasing both Pyrios and DUUS (and they wind up both already being in existance), I just want to know whether they could put DUUS atop Pyrios and have a viable LV.
I am not interested in cost, politics, or anything other than the technical aspects. Can you guys stick to that question, please?
I am curious to know whether DUUS is appropriately sized such that it could serve as the US on top of Pyrios, and if not whether slight modifications could make it work.
I think the DUUS is a little too wide for for the 5 meter Pyrios, you'd get an Ares 1 kind of situation. However, the 5 or 7.5 meter CPS proposed for Block 1A would probably fit, and if it has enough thrust it could probably take the role just perfectly.
Liftoff: is the thrust of the first stage sufficient to lift the combination of its own mass and the mass of the second stage?
Part of the problem is you get worked up.
...about myself or someone else discussing the feasibility of of Pyrios with the DUUS on top as it's own LV...but then turn around and say that you want to discuss the feasibility of Pyrios with the DUUS on top as it's own LV.
You guys are still OT. You have hijacked the thread. No one has even remotely addressed the question that the thread is about. The question is not about Pyrios, it is about DUUS. I am curious to know whether DUUS is appropriately sized such that it could serve as the US on top of Pyrios, and if not whether slight modifications could make it work.I have no interest in discussing Atlas, Delta, or Falcon. If NASA winds up building or purchasing both Pyrios and DUUS (and they wind up both already being in existance), I just want to know whether they could put DUUS atop Pyrios and have a viable LV. I am not interested in cost, politics, or anything other than the technical aspects. Can you guys stick to that question, please?
Finally, the Ares-5 Lite is nearly as expensive to develop as the Ares-5, but offers significantly less payload to the moon when used
He did mention the idea of switching out the engine cluster for a J-2X for this application, and having two versions of the stage. You'd have to change a lot, though...
That Pyrios/Delta is one looooonngg, skinny dude, eh?