Rocket engines of the United States

family of cryogenic methane-fueled rocket engines developed by SpaceX

rocket engine by Rocketdyne

The RS-25, also known as the Space Shuttle Main Engine (SSME), is a liquid-fuel cryogenic rocket engine that was used on NASA's Space Shuttle and is used on the Space Launch System.

family of rocket engines developed by SpaceX for use on its launch vehicles

cryogenic rocket engine by Rocketdyne

The RS-68 (Rocket System-68) was a liquid-fuel rocket engine that used liquid hydrogen (LH2) and liquid oxygen (LOX) as propellants in a gas-generator cycle. It was the largest hydrogen-fueled rocket engine ever flown.

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 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.

rocket engine used on the Saturn I and IB

The BE-4 (Blue Engine 4) is a liquid rocket engine developed by Blue Origin. It uses liquefied methane fuel and operates on an oxygen-rich staged combustion cycle. The BE-4 produces of thrust at sea level.

SuperDraco is a hypergolic propellant rocket engine designed and built by SpaceX. It is part of the SpaceX Draco family of rocket engines. A redundant array of eight SuperDraco engines provides fault-tolerant propulsion for use as a launch escape system for the SpaceX Dragon 2, a passenger-carrying space capsule.

family of rocket engines developed by SpaceX for use on its Falcon 1 launch vehicles

family of rocket engines developed by SpaceX for use on its Dragon spacecraft

BE-3 (Blue Engine 3) is a cryogenic rocket engine using liquid hydrogen and liquid oxygen as propellants. Blue Origin began BE-3 development in the early 2010s and the engine completed acceptance testing in early 2015. The BE-3PM variant is used on the New Shepard suborbital rocket, which made its first test flight on April 29, 2015, and had its first crewed flight on July 20, 2021. The BE-3U variant is used on the second stage of the New Glenn orbital rocket, which made its inaugural flight on January 16, 2025.

The RS-27 (Rocket System-27) was a liquid-propellant rocket engine developed in 1974 by Rocketdyne to replace the aging MB-3 in the Delta. Incorporating components of the venerable MB-3 and the H-1 designs, the RS-27 was a modernized version of the basic design used for two decades. It was used to power the first stage of the Delta 2000, 3000, 5000, and the first model of the Delta II, the Delta 6000.

rocket engine

The J-2X is a liquid-fueled cryogenic rocket engine that was planned for use on the Ares rockets of NASA's Constellation program, and later the Space Launch System. Built in the United States by Aerojet Rocketdyne (formerly, Pratt & Whitney Rocketdyne), the J-2X burns cryogenic liquid hydrogen and liquid oxygen propellants, with each engine producing of thrust in vacuum at a specific impulse (Isp) of . The engine's mass is approximately 2,470 kg (5,450 Lb), significantly heavier than its predecessors.

rocket engine used on the first stages of Titan rockets

thumb|An LR105 Atlas sustainer engine on display at the Air Zoo. The LR105 is a liquid-fuel rocket engine that served as the sustainer engine for the Atlas rocket family. Developed by Rocketdyne in 1957 as the S-4, it is called a sustainer engine because it continues firing after the LR89 booster engines have been jettisoned, providing thrust during the ascent phase.

The RS-88 (Rocket System-88) is a liquid-fueled rocket engine designed and built in the United States by Rocketdyne (later Pratt & Whitney Rocketdyne and then Aerojet Rocketdyne). Originally developed for NASA's Bantam System Technology program in 1997, the RS-88 burned ethanol fuel with liquid oxygen (LOX) as the oxidizer. It offered of thrust at sea level.

AJ-60A is a solid rocket booster produced by Aerojet Rocketdyne. Up to 2020 they were used as strap-on boosters on all United Launch Alliance Atlas V rocket configurations. They continue to be used on the Atlas V N22 configuration used to launch the Boeing Starliner.

thumb|Rocketdyne LR89 at the Evergreen Aviation & Space Museum The Rocketdyne LR89 was a liquid-fueled rocket engine developed in the 1950s by Rocketdyne, a division of North American Aviation. It was designed to serve as a booster engine the Atlas rocket family. The LR89 was a liquid oxygen (LOX) and RP-1 (kerosene) engine.

Rocket design meant for use on the Titan I missile

largest rocket engine to be designed

U.S. Air Force project in the 1990s and early 2000s