Difference between revisions of "CR-7 R.A.P.I.E.R. Engine"
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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. | 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. | ||
| − | This is the first stock engine which has multiple | + | This is one of the first stock engine which has multiple nozzles incorporated into one part (four in this case). |
| − | This is the first engine which has two different manufacturers. Prior to [[0.24]] | + | This is the first engine which has two different manufacturers. Prior to [[0.24]], the "[[:Category:Rockomax Conglomerate|Rockomax Conglomerate]]" in its description was misspelled (missing an o, making it "Rockmax Conglomerate"). |
== Performance and usage == | == Performance and usage == | ||
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. | 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. | ||
| − | This engine is one of the few engines that do not provide electric charge when active, another example being the LV-909 engine. | + | This engine is one of the few engines that do not provide electric charge when active, another example being the [[LV-909]] engine. |
Unlike the other jet engines, the R.A.P.I.E.R. has a rear mounting point. | Unlike the other jet engines, the R.A.P.I.E.R. has a rear mounting point. | ||
=== Air-breathing === | === Air-breathing === | ||
| − | 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 | + | 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 an order of magnitude higher than any stock rocket engines. On the other hand, it delivers better performance than the [[J-X4 "Whiplash" Turbo Ramjet Engine]] at high speeds (~1,000 m/s and higher) and altitudes (~17,000 m and higher), making it a good choice for high-speed atmospheric flight. Despite having 20% lower specific impulse than the Whiplash, its higher cruising altitude results in only about 5% more fuel consumption when traveling long distances. Its top speed is ~2,100 m/s in Kerbin's atmosphere (Mach 6.2). Its most fuel-efficient flight profile is Mach 3.6 at 17,600 m altitude. |
=== Closed-cycle === | === Closed-cycle === | ||
Latest revision as of 02:58, 12 November 2024
| CR-7 R.A.P.I.E.R. Engine | ||
 | ||
| Hybrid engine by C7 Aerospace Divisionand Rockomax Conglomerate | ||
| Radial size | Small | |
| Cost | (total) | 6 000.00 
|
| Mass | (total) | 2.000 t |
| Drag | 0.2 | |
| Max. Temp. | 2000 K | |
| Impact Tolerance | 20 m/s | |
| Research |  Aerospace Tech
| |
| Unlock cost | 35 000
| |
| Since version | 0.23 | |
| Part configuration | rapierEngine.cfg | |
| Maximum thrust | 105.00 kN | |
| Isp | (max) | 3200 s |
| Fuel consumption | 0.67  /s
| |
| Intake air consumption | 4.02  /s
| |
| Thrust vectoring | 3 ° | |
| Maximum thrust | (1 atm) | 162.30 kN |
| (vacuum) | 180.00 kN | |
| Isp | (1 atm) | 275 s |
| (vacuum) | 305 s | |
| Fuel consumption | 12.04 /s
| |
| Thrust vectoring | 3 ° | |
| Testing Environments | ||
| On the surface | Yes | |
| In the ocean | Yes | |
| On the launchpad | Yes | |
| In the atmosphere | Yes | |
| Sub-orbital | Yes | |
| In an orbit | Yes | |
| On an escape | Yes | |
| Docked | No | |
| Test by staging | Yes | |
| Manually testable | Yes | |
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 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 SABRE engine, which is also visible in the naming as both are named after swords.
This is one of the first stock engine which has multiple nozzles incorporated into one part (four in this case).
This is the first engine which has two different manufacturers. Prior to 0.24, the "Rockomax Conglomerate" in its description was misspelled (missing an o, making it "Rockmax Conglomerate").
Performance and usage
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.
This engine is one of the few engines that do not provide electric charge when active, another example being the LV-909 engine.
Unlike the other jet engines, the R.A.P.I.E.R. has a rear mounting point.
Air-breathing
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 an order of magnitude higher than any stock rocket engines. On the other hand, it delivers better performance than the J-X4 "Whiplash" Turbo Ramjet Engine at high speeds (~1,000 m/s and higher) and altitudes (~17,000 m and higher), making it a good choice for high-speed atmospheric flight. Despite having 20% lower specific impulse than the Whiplash, its higher cruising altitude results in only about 5% more fuel consumption when traveling long distances. Its top speed is ~2,100 m/s in Kerbin's atmosphere (Mach 6.2). Its most fuel-efficient flight profile is Mach 3.6 at 17,600 m altitude.
Closed-cycle
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, and has a moderate amount of ISP, comparable to most rocket engines. 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 not practical for extended spaceflight.
Product description
| “ | 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. — C7 Aerospace Division |
” |
Changes
- Jet engine Isp halved, thrust reduced
- 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.
- Cost decreased from 5900 to 3600 (and made meaningful), manufacturer name fixed, mass decreased from 1.75 to 1.2
- Initial release
