Posted on 07/08/2021 7:20:26 PM PDT by BenLurkin
For SLS, two well documented, and visible changes have been made to the boosters, which are technically called Five Segment Reusable Solid Rocket Motor (RSRMV): the addition of a fifth propellant segment and the removal of all recovery and reuse hardware.
The added fifth segment will produce 20% greater average thrust and 24% greater total impulse over the Shuttle-era design and will marginally increase the overall burn time of the five-segment SRBs to approximately 2 minutes 12 seconds, ten seconds longer than Shuttle.
The new segment will increase the overall thrust each booster is capable of producing, with each five-segment SRB generating a maximum of 3.6 million lbf (16,103 kN) of thrust for a total thrust from just the SRBs of 7.2 million lbf (32,027 kN) of thrust.
...SLS boosters will have their propellant grain shaped in such a way to tailor thrust at different parts of flight, allowing the solids to “throttle down” for Max-Q and “throttle back up” thereafter.
Like the new segment caused changes to modeling, the other major difference, not recovering the SRBs for reuse and post-flight inspection, has led to its own set of changes that had to be studied and accounted for.
Data regarding SRB flight performance and information from the web of Development Flight Instrument (DFI) attached to the boosters can no longer be stored on the boosters for review after flight. All of that must now be transmitted to the ground in real-time.
Another element of SLS that relates to the SRBs is the Launch Abort Motor, also built by Northrop Grumman. This motor on Orion’s Launch Abort System would pull the capsule and crew away from a failing rocket — even while the SRBs are burning.
(Excerpt) Read more at nasaspaceflight.com ...
Ping.
Thanks.
Dinosaur tech
For SLS, two well documented, and visible changes have been made to the boosters, which are technically called Five Segment Reusable Solid Rocket Motor (RSRMV): the addition of a fifth propellant segment and the removal of all recovery and reuse hardware.That's in the source article's third paragraph.
I hope "NasaSpaceFlight.com" isn't connected with the actual NASA by anything other than name.
When your chief engineer says neoprene O Rings suck at low temperatures they have not been tested for DON’t LAUNCH !!!
“Dinosaur tech”
Rocket technology has not changed in 75 years.
All designs developed by Von Braun are still in use.
Only scale and guidance is substantially different. And some of the solid fuels.
Remind me again for how many hundreds of millions of years the dinosaurs dominated the Earth?
Regards,
Noticed that, too. College educated writer, no doubt.
I think it was Allan McDonald who is portrayed in the Netflix doc about Challenger. He’s given FAR too much credit for simply voting ‘no’.
He should have rightly committed seppuku after the disaster for not going public before the launch.
The blame lies entirely at the feet of those engineers who chose pensions over safety.
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