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Northrop Grumman buying orbital atk


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10 hours ago, kerbiloid said:

"Civil" Pegasus returns to what it really did always belong to,

(I remember that discussion).

I think we've done this to death (currently going on the Stratolaunch thread).  To put simply, there are only so many options:

"conventional jet" (turbines provide compression) - all in one stage to mach ? (3 or less, and 3 is *extremely* pushing it).  Extremely expensive and must be covered.
rocket stage, ramjet stage, more rocket stages.  Presumably recovery after mach 3 or so makes sense, or you can expend a ramjet to mach 5 or maybe even 6.  Lots of complexity, staging issues, and iffy returns
rocket stage, scramjet stage, more rocket stages.  The scramjet stage that went to mach 6.8 was *tiny* compared to the pegasus derived engine that got it to speed.  Not ready.

The problem with adding a "second" jet stage is that the Pegasus already has most of the jet powered advantages: lower back pressure on the rocket (higher Isp) and lower aero drag.  Trying to squeeze out more delta-v by adding velocity by jet engine is going to be even more expensive.  The up front costs are enormous, and there is a lot of competition now for the tiny market of small satellites (spacex nearly went out of business with the Falcon 1, it needed the CRS contract (and Falcon 9) to make a go of it.  Also companies like Rocket Labs (electron rocket) didn't exist when Orbital launched the first Pegasus.
 

Edited by wumpus
premature post (trying to create single-spaced lines).
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20 hours ago, Scotius said:

More classified, DoD paid launches in the future? Hey, it's another paying customer interested in putting stuff in orbit. More payloads, more launches, cheaper rockets (maybe?).

Attracting a customer who thinks that $1,000 is a reasonable price for a hammer rarely drives down cost, rather the opposite. Doing lots of military contracts didn't drive down launch cost at ULA; having an aggressive competitor did.

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