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{{infobox rocket engine
|image=Shuttle Main Engine Test Firing.jpg
|image_size=250
|image_alt=A rocket engine firing. A blue flame is projecting from a bell-shaped nozzle with several pipes wrapped around it. The top of the nozzle is attached to a complex collection of plumbing, with the whole assembly covered in steam and hanging from a ceiling-mounted attachment point. Various pieces of transient hardware are visible in the background.
|caption=Space Shuttle Main Engine test firing.<br/><small>(The bright area at the bottom of the picture is a [[Mach disk]].)</small>
|name=RS-25
|country_of_origin={{USA}}
|manufacturer=[[Rocketdyne]]
|predecessor=[[:en:HG-3 (rocket engine)|HG-3]]
|first_date=April 12, 1981 ([[STS-1]])
|associated=[[Space Shuttle]]<br/>[[Space Launch System]]
|type=liquid
|fuel=[[Liquid hydrogen]]
|oxidiser=[[Liquid oxygen]]
|thrust(SL)={{convert|418000|lbf|kN|abbr=on|sigfig=3}}<ref name= "aerojet"/>
|thrust(Vac)={{convert|512300|lbf|kN|abbr=on|sigfig=4|lk=on}}<ref name= "aerojet"/>
|specific_impulse_vacuum={{convert|452.3|isp}}<ref name= "aerojet">Aerojet Rocketdyne, [https://www.rocket.com/rs-25-engine RS-25 Engine] (accessed July 22, 2014)</ref>
|specific_impulse_sea_level={{convert|366|isp}}<ref name= "aerojet" />
|chamber_pressure={{convert|2994|psi|MPa|abbr=on}}<ref name= "aerojet" />
|cycle=[[Staged combustion cycle (rocket)|Staged combustion]]
|nozzle_ratio=69:1 <ref name= "aerojet" />
|length={{convert|168|in|m}}
|diameter={{convert|96|in|m}}
|dry_weight=<!-- {{convert|7,774|lb|kg}}{{cn|date=November 2013}} --><!-- no source supports the 7,774 lb number. The Wade/Astronautics source suggests it as only 7004 lbs, but then not clear that it may not have been a larger mass in later engines -->
|status=Inactive since [[STS-135]]
|references=<ref name="P&WFS">{{cite web|url=http://www.pw.utc.com/products/pwr/assets/pwr_SSME.pdf|title=Space Shuttle Main Engine|publisher=Pratt & Whitney Rocketdyne|accessdate=November 23, 2011|year=2005|format=PDF}} {{dead link|date=January 2014}}</ref><ref name="EASSME">{{cite web|url=http://www.astronautix.com/engines/ssme.htm|title=SSME|first=Mark|last=Wade|publisher=Encyclopedia Astronautica|accessdate=October 27, 2011}}</ref>
|notes=Data is for RS-25D at 109% throttle.
}}
'''RS-25''', atau dikenal sebagai '''Space Shuttle Main Engine (SSME)''' atau '''Mesin Utama Pesawat Ulang alik''', adalah sebuah [[mesin roket]] bahan bakar cair kriogenik yang digunakan pada Space Shuttle NASA dan direncanakan akan digunakan pada penggantinya, Space Launch System. Dibangun di Amerika Serikat oleh Rocketdyne, RS-25 membakar hidrogen cair cryogenic & propelan oksigen cair, dengan masing-masing mesin memproduksi 1.859 kN (418.000 lbf) daya dorong di lepas landas.
== Referensi ==
{{Reflist}}
{{reflist|2}}
{{Rocket Engines}}
==External Links==
{{Commons category|Space Shuttle main engines}}
{{Include-NASA}}
* [http://nasatech.net/ntSSMEPF_PAGE.html Spherical panoramas of RS-25D in SSME Processing Facility prior to shipping to Stennis Space Center]
[[Kategori:Mesin roket]]
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