RL-10

The RL10 is a liquid-fuel cryogenic rocket engine built in the United States by Aerojet Rocketdyne that burns cryogenic liquid hydrogen and liquid oxygen propellants. Modern versions produce up to 110 kN (24,729 lb_f) of thrust per engine in vacuum. RL10 versions were produced for the Centaur upper stage of the Atlas V and the DCSS of the Delta IV. More versions are in development or in use for the Exploration Upper Stage of the Space Launch System and the Centaur V of the Vulcan rocket.

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1961  Wikimedia, Wikidata
RL10
cryogenic rocket engine, 
Sikh Confederacy, 1961, C, A, Ekran, Dong Fang Hong 2, cryogenic rocket engine, Tarshish, Sweden, United States, Persia, Kingdom of Wolaita, Kingdom of Martabam-hongsawatoi, Havilah, Chinland, Calvinist Republic of Ghent, Ashkenaz, 

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Location: KML, Cluster Map, Maps,

Frameless

RL-10 rocket engine

This drawing clearly shows the comparative sizes of the rocket engines used to launch the Saturn vehicles. The RL-10 and the H-1 engines were used to launch the Saturn I rockets.

Rocket Engines Displayed for 1966 Inspection at Lewis Research Center

First developed in 1959, the Pratt & Whitney RL10 was the first hydrogen/oxygen engine, yet it is still the most fuel efficient engine ever made, and the highest ISP engine flying today. .

Scott Manley and his fave artifact – the RL10 Engine

Type	Subtype	Date	Description	Notes	Source
commons	image		RL-10 rocket engine		Commons
commons	image		This drawing clearly shows the comparative sizes of the rocket engines used to launch the Saturn vehicles. The RL-10 and the H-1 engines were used to launch the Saturn I rockets.		Commons
commons	image		Rocket Engines Displayed for 1966 Inspection at Lewis Research Center		Commons
commons	image		First developed in 1959, the Pratt & Whitney RL10 was the first hydrogen/oxygen engine, yet it is still the most fuel efficient engine ever made, and the highest ISP engine flying today. .		Commons
commons	image		Scott Manley and his fave artifact – the RL10 Engine		Commons