Author Topic: DARPA Experimental Spaceplane 1 (XS-1) Program  (Read 260650 times)

Online TrevorMonty

Re: DARPA Experimental Spaceplane 1 (XS-1) Program
« Reply #780 on: 01/04/2018 03:14 AM »
You try to compare apples with orangeds. Shuttle was booster engines + upper stage + crew and had to handle LEO reentry speeds. The XSP is engine, fuel tanks reentry speed is only 10-20% of Shuttle.

The ARJ engines maybe 30-40yrs old but they haven't been stored in a barn for last 30years.

Offline UltraViolet9

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Re: DARPA Experimental Spaceplane 1 (XS-1) Program
« Reply #781 on: 01/08/2018 08:06 PM »
BTW I've met Jess Sponable and I liked him a lot.

I just noticed today that Jess left DARPA and XS-P around November last year (2017).

The new PM is Scott Wierzbanowski, who was the SETA lead for XS-P under Jess and who also took over GREMLINs.

https://www.darpa.mil/program/experimental-space-plane

Jess's LinkedIn profile indicates that he's been consulting through his own LLC since last November.

My read is that the program is being redirected unsubtlely. It provides a means for a response to certain threats, at a different scale than intended, and compromises on the economics of operation to get there.

I don't know if Jess's leaving has anything to do with that.

But I'd be interested if anyone else has an insight.

Offline john smith 19

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Re: DARPA Experimental Spaceplane 1 (XS-1) Program
« Reply #782 on: 02/18/2018 04:41 PM »
BTW I've met Jess Sponable and I liked him a lot.

I just noticed today that Jess left DARPA and XS-P around November last year (2017).

The new PM is Scott Wierzbanowski, who was the SETA lead for XS-P under Jess and who also took over GREMLINs.

https://www.darpa.mil/program/experimental-space-plane

Jess's LinkedIn profile indicates that he's been consulting through his own LLC since last November.
Oh dear. That does not bode well for a programme going to completion and getting something built.  :(
BFS. The worlds first Methane fueled FFORSC engined CFRP structured A380 sized aerospaceplane tail sitter capable of flying in Earth and Mars atmospheres. BFR. The worlds biggest Methane fueled FFORSC engined CFRP structured booster for BFS. First flight to Mars by end of 2022. Forward looking statements. T&C Apply So, you are going to Mars to start a better life? Picture it in your mind. Now say what it is out loud.

Online Davidthefat

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Online envy887

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Offline Elmar Moelzer

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Re: DARPA Experimental Spaceplane 1 (XS-1) Program
« Reply #785 on: 06/05/2018 04:49 AM »
First AR-22 engine assembled.

http://rocket.com/article/first-engine-assembled-darpa-and-boeing-reusable-experimental-spaceplane
The amount of progress over the past year is truly staggering /sarkasm

Offline deruch

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Re: DARPA Experimental Spaceplane 1 (XS-1) Program
« Reply #786 on: 06/06/2018 10:08 PM »
First AR-22 engine assembled.

http://rocket.com/article/first-engine-assembled-darpa-and-boeing-reusable-experimental-spaceplane
The amount of progress over the past year is truly staggering /sarkasm

My favorite bit is that they went to the trouble to give metric conversions, but then converted pounds-force to kilograms instead of newtons.  :-[

Quote
The AR-22 engine is capable of generating about 375,000 pounds (170,097 kg) of thrust

Should be ~1.67 MN.
Shouldn't reality posts be in "Advanced concepts"?  --Nomadd

Offline hkultala

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Re: DARPA Experimental Spaceplane 1 (XS-1) Program
« Reply #787 on: 06/07/2018 05:11 AM »
[offtopic]

It always amused me that Shuttle had a stack mass of about 4000 000lbs and a payload (in the bay) of 55 000. IE it had the performance of an SSTO and the mass of a multi stage ELV. IOW the worst of both worlds.  :( It was however the only way to deliver a vehicle on the budget without going Biemese or Triemese.

Was it really? wouldn't expendable S-IC booster with J-2S based serial-staged orbiter have been much cheaper to develop?

Not done because expending S-IC was considered to be too expensive, but might in the end have actually been much cheaper for total costs as the flight rate ended up being much smaller than originally planned.

[/offtopic]

Offline john smith 19

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Re: DARPA Experimental Spaceplane 1 (XS-1) Program
« Reply #788 on: 06/07/2018 05:52 AM »
[offtopic]

It always amused me that Shuttle had a stack mass of about 4000 000lbs and a payload (in the bay) of 55 000. IE it had the performance of an SSTO and the mass of a multi stage ELV. IOW the worst of both worlds.  :( It was however the only way to deliver a vehicle on the budget without going Biemese or Triemese.

Was it really? wouldn't expendable S-IC booster with J-2S based serial-staged orbiter have been much cheaper to develop?

Not done because expending S-IC was considered to be too expensive, but might in the end have actually been much cheaper for total costs as the flight rate ended up being much smaller than originally planned.

[/offtopic]
Within the constraint the system be at least partly reusable.
BFS. The worlds first Methane fueled FFORSC engined CFRP structured A380 sized aerospaceplane tail sitter capable of flying in Earth and Mars atmospheres. BFR. The worlds biggest Methane fueled FFORSC engined CFRP structured booster for BFS. First flight to Mars by end of 2022. Forward looking statements. T&C Apply So, you are going to Mars to start a better life? Picture it in your mind. Now say what it is out loud.

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