Pyrios is an advanced

Liquid rocket booster A liquid rocket booster (LRB) uses liquid fuel and oxidizer to give a liquid-propellant or hybrid rocket an extra boost at take-off, and/or increase the total payload that can be carried. It is attached to the side of a rocket. Unlike solid rocket ...

concept proposed in 2012 by

Dynetics Dynetics is an American applied science and information technology company headquartered in Huntsville, Alabama. Its primary customers are the United States Department of Defense (DoD), the United States Intelligence Community, and National Ae ...

for use on NASA's

Space Launch System The Space Launch System (SLS) is an American super heavy-lift expendable launch vehicle developed by NASA. As of 2022, SLS has the highest payload capacity of any rocket in operational service, as well as the greatest liftoff thrust of any r ...

heavy-lift launch vehicle. Pyrios was intended to use the

RP-1 RP-1 (alternatively, Rocket Propellant-1 or Refined Petroleum-1) is a highly refined form of kerosene outwardly similar to jet fuel, used as rocket fuel. RP-1 provides a lower specific impulse than liquid hydrogen (LH2), but is cheaper, is st ...

LOX Liquid oxygen—abbreviated LOx, LOX or Lox in the aerospace, submarine and gas industries—is the liquid form of molecular oxygen. It was used as the oxidizer in the first liquid-fueled rocket invented in 1926 by Robert H. Goddard, an applica ...

F-1B, a modernized version of the F-1A engine built by Aerojet Rocketdyne. Developed during the later stages of the Apollo program, the F-1A was test-fired but never flew. Several were created and stored by Rocketdyne. The company has also maintained an F-1/F-1A knowledge retention program for its engineers for the entire period the engine has been mothballed. Dynetics is now performing tests on engine components pulled from storage. Pyrios was intended to use the same attachment points as the five-segment SRBs The name is derived from Greek mythology. Pyrois was a horse that pulled sun god Helios’ chariot".

References

Rocket engines using kerosene propellant {{rocket-stub