ZR-1 Net Registry Forums - View Single Post - Assembling a 12 milion horsepower engine in 2 minutes

Hog · 06-06-2015

And here is the January 2015 test of Development engine 0525

https://www.youtube.com/watch?v=hG8odscqlfI

And same engine being testing in May 2015. 6 more tests (8 total) for DE-0525, totaling 3,500 seconds, then testing will begin on DE-0528, with a scheduled 10 tests for a total of 4,500 seconds..

https://www.youtube.com/watch?v=Xz1L2-CjsIo

Interesting tidbits about the RS-25 engine

Minimum Power Level (MPL)=67% 316,100 lbs.
Rated Power Level (RPL)=100% 470,800 lbs.
Nominal Power Level (NPL)=104.5%=491,900 lbs.
Full Power Level (FPL)=109%=512,900 lbs

Each Percent of throttle= approx. 4,700lbs
Throttle range 67%-109%
Chamber pressure at 109%=3008 psi

The Space Launch System will run each of the 4 RS-25 engines at 109% Full Power Level, whereas Shuttle ran its 3 RS-25s at 100% for liftoff then throttled up to 104.5% once the Shuttle stack cleared the tower. The only time Shuttle would have run her engines at 109% would have been during a very serious contingency, such as 1 or 2 engines going down requiring Full Power to save the crew and vehicle. 109% FPL was very hard on the Main Propulsion System(MPS) causing damage. Since the RS-25 will be used in the expendable role during SLS usage, and not fully reuseable like it was during Shuttle, 109%FPL on all 4 engines will be used.

Pegasus barge which was used to transport Shuttle External Tanks(ET) to KSC has been lengthened in order to transport new core stages(with its 4 engines) from Stennis after "green testing- or firing all 4 engines at once on a test stand-similar to F-1 tests of Saturn V 1st stages to KSC for launch.

Test of the Sound Suppression Water System(SSWS) at Launch Complex 39-B. 300,000 gallons of water are released onto the MLP/pad just before engine ignition and for a few seconds after the Shuttle/SLS rocket clears the tower. The water being flashed to steam helps to reduce/absorb acoustical energy that could otherwise damage the vehicle during engine/SRB ignition.

Picture of the modified Mobile Launch Platform(MLP) with its tall Launch Umbilical Tower, and an upgraded 6,000,000 lb.Crawler Transporter(CT). The CT was modified increase its lifting capacity from 5,400,000 kgs to 8,200,000 kgs or 12,000,000lbs to 18,000,000 lbs.

Artists impression of a Crewed version of SLS launching from LS 39-B.

06-06-2015	#2
Hog Join Date: Jul 2010 Location: Woodstock, Ontario, Canada Posts: 1,271	Re: Assembling a 12 milion horsepower engine in 2 minutes And here is the January 2015 test of Development engine 0525 https://www.youtube.com/watch?v=hG8odscqlfI And same engine being testing in May 2015. 6 more tests (8 total) for DE-0525, totaling 3,500 seconds, then testing will begin on DE-0528, with a scheduled 10 tests for a total of 4,500 seconds.. https://www.youtube.com/watch?v=Xz1L2-CjsIo Interesting tidbits about the RS-25 engine Minimum Power Level (MPL)=67% 316,100 lbs. Rated Power Level (RPL)=100% 470,800 lbs. Nominal Power Level (NPL)=104.5%=491,900 lbs. Full Power Level (FPL)=109%=512,900 lbs Each Percent of throttle= approx. 4,700lbs Throttle range 67%-109% Chamber pressure at 109%=3008 psi The Space Launch System will run each of the 4 RS-25 engines at 109% Full Power Level, whereas Shuttle ran its 3 RS-25s at 100% for liftoff then throttled up to 104.5% once the Shuttle stack cleared the tower. The only time Shuttle would have run her engines at 109% would have been during a very serious contingency, such as 1 or 2 engines going down requiring Full Power to save the crew and vehicle. 109% FPL was very hard on the Main Propulsion System(MPS) causing damage. Since the RS-25 will be used in the expendable role during SLS usage, and not fully reuseable like it was during Shuttle, 109%FPL on all 4 engines will be used. Pegasus barge which was used to transport Shuttle External Tanks(ET) to KSC has been lengthened in order to transport new core stages(with its 4 engines) from Stennis after "green testing- or firing all 4 engines at once on a test stand-similar to F-1 tests of Saturn V 1st stages to KSC for launch. Test of the Sound Suppression Water System(SSWS) at Launch Complex 39-B. 300,000 gallons of water are released onto the MLP/pad just before engine ignition and for a few seconds after the Shuttle/SLS rocket clears the tower. The water being flashed to steam helps to reduce/absorb acoustical energy that could otherwise damage the vehicle during engine/SRB ignition. Picture of the modified Mobile Launch Platform(MLP) with its tall Launch Umbilical Tower, and an upgraded 6,000,000 lb.Crawler Transporter(CT). The CT was modified increase its lifting capacity from 5,400,000 kgs to 8,200,000 kgs or 12,000,000lbs to 18,000,000 lbs. Artists impression of a Crewed version of SLS launching from LS 39-B.