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− | {{:R.A.P.I.E.R. Engine/Box}}
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− | The '''CR-7 R.A.P.I.E.R. Engine''' (Reactive Alternate-Propellent Intelligent Engine for Rockets) is a hybrid engine. It can change between an [[jet engine|airbreathing jet]] and a [[liquid fuel engine]]. It has the feature to auto adjust, changing between jet and rocket mode automatically when it runs out of intake air. This engine is an in-game counterpart of the real life [[w:SABRE (rocket engine)|SABRE]] engine, which is also visible in the naming as both are named after swords.
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− | This is the first stock engine which has multiple engines incorporated into one part (four in this case).
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− | This is the first engine which has two different manufacturers. Prior to [[0.24]] one of the manufacturers seems to be misspelled. Instead of [[:Category:Rockomax Conglomerate|Rockomax Conglomerate]] an ''o'' was missing attributing it to the Rockmax Conglomerate. However, the description text used the common spelling and the manufacturer entry was fixed in 0.24.
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− | == Usage ==
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− | This engine has two modes of operation. An ''AirBreathing'' mode in which it runs on liquid fuel and intake air like a jet engine and a ''ClosedCycle'' mode in which it runs on liquid fuel and oxidizer like a rocket engine. The engine can either be set to switch automatically to closed-cycle when the intake air runs out or it can be switched manually between the two modes. The hybrid feature makes this engine especially useful for [[single-stage-to-orbit]] designs as it saves the weight of a separate engine.
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− | This engine is one of the few engines that do not provide electric charge when active, another example being the LV-909 engine.
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− | Unlike the other jet engines, the R.A.P.I.E.R. has a rear mounting point.
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− | === Air-breathing ===
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− | Like other jet engines, the air-breathing mode only works in the atmospheres of [[Kerbin]] or [[Laythe]]. The air-breathing mode has lower specific impulse than the other jets, though still a order of magnitude higher than most rocket engines. On the other hand, it delivers better performance than the [[J-X4 "Whiplash" Turbo Ramjet Engine]] at high speeds (~1000 m/s and higher) and altitudes (~17 km and higher), making it a good choice for high-speed atmospheric flight.
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− | === Closed-cycle ===
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− | The closed-cycle performance is merely mediocre. Its specific impulse is in the middle of the pack compared to other rocket engines. As a pure rocket, its thrust-to-weight ratio is worse than any conventional rocket. However, the R.A.P.I.E.R. is lighter and more compact than having a separate jet engine and rocket. This makes the R.A.P.I.E.R a good choice for single-stage-to-orbit (SSTO) where use of the rocket can be kept to a minimum, but poor for extended spaceflight.
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− | == Product description ==
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− | {{Quote
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− | |The R.A.P.I.E.R. (Reactive Alternate-Propellant Intelligent Engine for Rockets) is a joint venture between C7 Aerospace and the Rockomax Conglomerate. Designed to fill a gap in the design requirements for sustainable single stage to orbit aircraft, this engine combines the best of rocket and air-breathing thrust technology.
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− | }}
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− | == Changes ==
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− | ;[[1.0.3]]
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− | * Jet engine I<sub>sp</sub> halved, thrust reduced
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− | ;[[1.0]]
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− | * Mass increased from 1.2 to 2.0; cost increased from 3600 to 6000; maximum jet thrust reduced from 190 to 140; maximum liquid fuel thrust increased from 175 to 180.
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− | ;[[0.24]]
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− | * Cost decreased from 5900 to 3600 (and made meaningful), manufacturer name fixed, mass decreased from 1.75 to 1.2
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− | ;[[0.23]]
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− | * Initial release
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− | {{Parts}}
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− | [[Category:Liquid fuel engines]]
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− | [[Category:Jet engines]]
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