NASA Space Launch System (SLS)

[TomcatViP]

“SLS will go away," he said. "It could go away during a Biden administration or a next Trump administration… because at some point commercial entities are going to catch up. They are really going to build a heavy lift launch vehicle sort of like SLS that they will be able to fly for a much cheaper price than NASA can do SLS. That’s just the way it works.”
Charlie Bolden, a four-time astronaut, served as NASA administrator from mid-2009 through early 2017.

Charlie Bolden says the quiet part out loud: SLS rocket will go away – Ars Technica

 

[merriman]

Catch up with what? The Saturn-5? Another big piece of disposable ammunition that has yet to fly?

NASA: lead, follow, or get the hell out of the way.

NASA should do the basic research and development. Let the private sector pick and chose what findings have utility and are worthy of exploitation.

David
uninformed Navy type, and Tax Frig'n Payer!

 

[fredymac]

I wonder if anyone has run an actual CFD like this.

 

[TomcatViP]

If that is a solid booster, that's not how combustion takes place.

A better simulation would be scratching a matches and holding it upside down b/w your fingers...

 

[Byeman]

Has anyone already pointed out that Lockheed's "Orion" capsule is after all the capsule that Boeing proposed for the "Orbital Space Plane" program, which Lockheed won with their innovative hypersonic-lifting body design that required parachutes to land because it became unstable at low speed.

No.
A. Lockheed did not win OSP. Both Boeing and Lockheed were still in competition. Downselect to one contractor hadn't occurred at the time of cancelation.
B. Lockheed's current design at the time of OSP cancellation was a capsule and not a lifting body. The change to capsules occurred early in the OSP project.
c. Starliner is basically Boeing's OSP design at the point of cancelation.

 

[Byeman]

Catch up with what? The Saturn-5? Another big piece of disposable ammunition that has yet to fly?

David
uninformed Navy type, and Tax Frig'n Payer!

Just stop with it. Falcon 9 and New Glenn are still disposable rockets.

 

[Moose]

If that is a solid booster, that's not how combustion takes place.

A better simulation would be scratching a matches and holding it upside down b/w your fingers...

It's a decent enough sim, the big SRBs uses by STS/SLS are ignited from the top and burn down through the hollow core.

 

[TomcatViP]

I do admit that it is confusing but:

The fire 2 commands cause the redundant NSDs to fire through a thin barrier seal down a flame tunnel. This ignites a pyro. booster charge, which is retained in the safe and arm device behind a perforated plate. The booster charge ignites the propellant in the igniter initiator; and combustion products of this propellant ignite the solid rocket motor initiator, which fires down the entire vertical length of the solid rocket motor igniting the solid rocket motor propellant along its entire surface area instantaneously.

Space Shuttle Solid Rocket Booster - Wikipedia

en.m.wikipedia.org

 

[RanulfC]

Has anyone already pointed out that Lockheed's "Orion" capsule is after all the capsule that Boeing proposed for the "Orbital Space Plane" program, which Lockheed won with their innovative hypersonic-lifting body design that required parachutes to land because it became unstable at low speed.

No.
A. Lockheed did not win OSP. Both Boeing and Lockheed were still in competition. Downselect to one contractor hadn't occurred at the time of cancelation.

Quite right actually I let my self be draw in by LM's hype near the end.

B. Lockheed's current design at the time of OSP cancellation was a capsule and not a lifting body. The change to capsules occurred early in the OSP project.

Actually near the end of OSP LM had a 'winged' body:

... configuration, (they did in fact state in an official report that a capsule was actually what fit the NASA requirements, better than any lifting or winged body would) that morphed into a hypersonic lifting body design seen here:

At that point Boeing was the only company pushing a capsule and to meet the "Spaceplane" requirement they still offered an "X-37-ish" concept:

that I can't find was every pushed as hard as the capsule design. The LM change to a capsule didn't come till CEV evolved quite a bit.


c. Starliner is basically Boeing's OSP design at the point of cancelation.[/QUOTE]

This being the what essentially both were offering when OSP transitioned into CEV program.

 

[Byeman]

B. Lockheed's current design at the time of OSP cancellation was a capsule and not a lifting body. The change to capsules occurred early in the OSP project.

Actually near the end of OSP LM had a 'winged' body:

... configuration, (they did in fact state in an official report that a capsule was actually what fit the NASA requirements, better than any lifting or winged body would) that morphed into a hypersonic lifting body design seen here:

At that point Boeing was the only company pushing a capsule and to meet the "Spaceplane" requirement they still offered an "X-37-ish" concept:

that I can't find was every pushed as hard as the capsule design. The LM change to a capsule didn't come till CEV evolved quite a bit.

[/QUOTE]

No, capsules were proposed by both Boeing and LM in the summer of 2003, long before there was a CEV program or the end of OSP. I was working OSP launch vehicle integration. I have documents, just can't share them. The requirement that drove the designs to capsule was passive entry. Lifting bodies need active guidance, a ballistic capsule doesn't.

 

[Flyaway]

I should have posted this earlier but more technical issues for SLS & weather issues.

SLS Program hit by Hurricane Zeta while working through Green Run issues - NASASpaceFlight.com

The law of averages caught up to the New Orleans area and the two NASA…

www.nasaspaceflight.com

 

[Grey Havoc]

SLS: Nasa 'megarocket' assembly begins in Florida

Nasa has stacked the first pieces of the Space Launch System (SLS) rocket at Florida's Kennedy Space Center.

www.bbc.com

 

[TomcatViP]

NASA Space Launch System Rocket Proceeding with Green Run Hot Fire

NASA is targeting the final test in the Green Run series, the hot fire, for as early as Jan.17. The hot fire is the culmination of the Green Run test series, an eight-part test campaign that gradually brings the core stage of the Space Launch System (SLS) — the deep space rocket that will power...

www.nasa.gov

 

[TomcatViP]

Aerojet Rocketdyne completes first AR1 rocket engine, but won't test fire until at least 'late 2022'

Aerojet Rocketdyne finished building the first of its AR1 engine series, but lacks both a customer and plans to test-fire until at least late 2022.

www.cnbc.com

 

[mkellytx]

Aerojet Rocketdyne completes first AR1 rocket engine, but won't test fire until at least 'late 2022'

Aerojet Rocketdyne finished building the first of its AR1 engine series, but lacks both a customer and plans to test-fire until at least late 2022.

www.cnbc.com

Don't now whether to laugh or cry, the project officer for that was a fellow captain in EELV we worked the project as risk reduction should the RD-180 go away (he was the PO and I owned the RM process), nothing like a government program that continues after the user chose the BE-4...

 

[Moose]

ULA's rocket is not the last ever to be built, having another high-performance kerolox engine out there ready for use isn't the worst thing in the world.

 

[sferrin]

Aerojet Rocketdyne completes first AR1 rocket engine, but won't test fire until at least 'late 2022'

Aerojet Rocketdyne finished building the first of its AR1 engine series, but lacks both a customer and plans to test-fire until at least late 2022.

www.cnbc.com

Don't now whether to laugh or cry, the project officer for that was a fellow captain in EELV we worked the project as risk reduction should the RD-180 go away (he was the PO and I owned the RM process), nothing like a government program that continues after the user chose the BE-4...

Government efficiency.

 

[mkellytx]

ULA's rocket is not the last ever to be built, having another high-performance kerolox engine out there ready for use isn't the worst thing in the world.

Perhaps, wonder what the SLS throw weight becomes with 4 AR-1's?

 

[mkellytx]

Don't now whether to laugh or cry, the project officer for that was a fellow captain in EELV we worked the project as risk reduction should the RD-180 go away (he was the PO and I owned the RM process), nothing like a government program that continues after the user chose the BE-4...

Government efficiency.

Self licking ice cream cones?

 

[Moose]

ULA's rocket is not the last ever to be built, having another high-performance kerolox engine out there ready for use isn't the worst thing in the world.

Perhaps, wonder what the SLS throw weight becomes with 4 AR-1's?

Studies of SLS withhigh-performance liquid boosters in place of the solids have pointed to something like 10-20t improvement to LEO depending upon the details of the booster. Thats maybe more politically doable with Lockheed backing the engine following their purchase of AJR, maybe.

But I was thinking of the on-again, off-again DARPA and USAF (presumably Space Force going forward) efforts to build a winged fly-back booster. AR-1 would be a great fit for a Lockheed bid on such a vehicle.

 

[TomcatViP]

Seems now LM has all it needs in hands to refresh their X-33

 

[sferrin]

Seems now LM has all it needs in hands to refresh their X-33

Except money and a customer.

 

[TomcatViP]

Capital raising. A private venture.

 

[sferrin]

Capital raising. A private venture.

Don't see how it could compete with Starship cost-wise. Maybe a different mission?

 

[mkellytx]

But I was thinking of the on-again, off-again DARPA and USAF (presumably Space Force going forward) efforts to build a winged fly-back booster. AR-1 would be a great fit for a Lockheed bid on such a vehicle.

Back in 2011 my commander gave me the news that project was my next job, the next week it went through the off-again phase. IIRC AR-1 was supposed to be used on it.

 

[TomcatViP]

Different mission profile

 

[Flyaway]

View: https://youtu.be/PapBjpzRhnA

 

[sean hunter]

i guess the joint venture with nasa was them saying they needed spacex's help. i mean the retunable/landable first stage is kinda cool though.

 

[TomcatViP]

UPDATE #2 – Jan. 16th at 9:25 pm EST
In a post-test briefing, NASA and Boeing officials confirmed that an investigation into the cause of the Major Component Failure on Engine 4 that stopped the hot fire test at 67.7 seconds after ignition is underway, but stated that no further information was known at the time.
NASA Administrator Jim Bridenstine stated that not enough information was known about the abort to determine whether the test can be classed as a success.
If another hot fire test is scheduled, it will take a minimum of 21-30 days to refurbish the engines to fire again.
Administrator Bridenstine also stated that despite not accomplishing major test objectives and the outstanding questions and investigations that now must take place, the agency is not ruling out signing off on the test and sending the Core Stage to Florida for flight this year to “stay on schedule.”

NASA SLS Core Stage aborts high-stakes Green Run static fire - NASASpaceFlight.com

NASA’s Space Launch System (SLS) program and Core Stage prime contractor Boeing were ready for…

www.nasaspaceflight.com

 

[Flyaway]

Green Run hotfire test ends early - SpaceNews

NASA performed a hotfire test of the core stage of the Space Launch System Jan. 16, but the its engines shut down after a little more than a minute.

spacenews.com