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The sound produced by the Frontier engine
The flame produced by the Frontier engine
The Frontier Engine is a high-efficiency moderate-thrust engine used mainly for the upper stages of orbital-class rockets. It is the upper-stage counterpart of the Titan Engine and the larger equivalent of the Valiant Engine. It has the second highest efficiency after the Ion Engine.
The engine most likely represents a hydrolox fuel engine, which uses liquid hydrogen alongside liquid oxygen to produce thrust. This is most readily apparent from the transparent blue hue and visible shock diamond of its plume.
Trivia[]
- This engine most likely represents the RS-25 SSME, Rocketdyne J-2, or the Rocketdyne J-2X.
- Before 1.5, the Frontier Engine used the Hawk Engine/Titan Engine's sound as a placeholder. This was changed in 1.5.
- Four clipped Frontier Engines can be a replacement for the Titan Engine. It consumes 18% less fuel than the Titan Engine, but it weighs twice as much as the Titan engine.
