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260 inch diameter solid rocket motor - largest ever made

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Winston

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The largest diameter solid rocket motor ever made and the highest thrust rocket motor of any kind ever made. Propellant burned at 6 tons per second rate. It took three months around the clock to fill with propellant using many small batches; elevated temperature cured for three weeks; cooled for two weeks. After the mandrel was withdrawn technicians were lowered into the core to inspect for defects. The SL-3 test produced over 5 million pounds of thrust.

Thrust: 17,695.30 kN (3,978,062 lbf)
Gross mass: 831,345 kg (1,832,801 lb)
Unfuelled mass: 85,321 kg (188,100 lb)
Specific impulse: 263 s
Specific impulse sea level: 238 s
Burn time: 114 s.
Height: 18.29 m (60.00 ft)
Diameter: 6.60 m (21.60 ft)
Exhaust candlepower: 3 million

http://www.astronautix.com/a/aj-260-2.html

http://nasawatch.com/archives/2015/03/nasa-forgot-the.html

GREAT video overview of manufacture and firing:

https://youtu.be/o4BkDQjM2Jc?t=22m4s















 

Nytrunner

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What is that, 50% AE?
An AE17,695(k)....(plugged)? lol

Someone pull Orbital ATK's catalogue and check what the SLS boosters run!
I know they're an AE (5 gr reload), but I don't remember the percentage.
 

ksaves2

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I think one of the empty casings is in the ground there too. Kurt
 

MClark

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There are videos on YouTube where people have recently gone to the site. Motor casing is still in the hole.
 

Winston

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[video=youtube;rmtzFNy1t3U]https://www.youtube.com/watch?v=rmtzFNy1t3U[/video]

[video=youtube;tOYKdJqX1HQ]https://www.youtube.com/watch?v=tOYKdJqX1HQ[/video]
 

Nytrunner

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At 15:50, did anyone else see that small smoke trail and think "There goes the igniter pellet!"?
 

aerostadt

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At 15:50, did anyone else see that small smoke trail and think "There goes the igniter pellet!"?
In a way that was the igniter pellet. I remember a story about this static test years ago. I am thinking it was Life magazine. Anyways, the static test motor was igniting by a vertically flying rocket initially positioned at the bottom of the test motor. When the small rocket was ignited, it flew out of the test motor igniting live propellant all the way up the bore as it flew out. Talk about a novel ignition system.
 
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