R121 Turboshaft Engine
 | Available only with the Breaking Ground Expansion installed. |
| R121 Turboshaft Engine | ||
 | ||
| Turboshaft engine by C7 Aerospace Division | ||
| Radial size | Tiny | |
| Cost | (total) | 500.00 
|
| (dry) | 200.00
| |
| Mass | (total) | 1.215 t |
| (dry) | 0.615 t | |
| Drag | 0.2 | |
| Max. Temp. | 2000 K | |
| Impact Tolerance | 12 m/s | |
| Research |  Aerodynamics
| |
| Unlock cost | 1 200
| |
| Since version | 1.7.3 | |
| Part configuration | RotorEngine_02.cfg | |
| Fuel consumption | 0.4  /s
| |
| Intake air consumption | 18.8  /s
| |
| Intake speed | 75 m/s | |
| Intake area | 0.5 m2 | |
| Electricity generated | 0.4 ⚡/s | |
| Packed volume | None | |
| Intake air | 3
| |
Product description
| “ | This strong turbine engine consumes liquid fuel and outputs angular acceleration. Also emits a pleasently high pitched whine. — C7 Aerospace Division |
” |
Use
This engine consumes intake air and liquid fuel to produce angular acceleration (rotation). When you put a set of propellers on it, you can produce thrust. The engine alone doesn't produce thrust. Setting up the engine is tricky, and doesn't have control via throttle by default. It is recommended to set throttle for propeller pitch instead of rotation or torque. Note that the engine requires intake air, so it only works on Kerbin and Laythe. On planets or moons that have a non-breathable atmosphere (Eve, Duna, Jool), electric motors such as the EM-32 Standard Rotor need to be used for propeller planes.
This engine has a very high torque and relatively low RPM which results in excessive torque effect by Newton's third law and large fuel consumption. This makes single-engine planes roll in the opposite direction of the rotor and reduces endurance. Both problems can be minimized by reducing the engine size/power in editor. On multiple engine craft it is highly recommended to set left and right engines to rotate in opposite directions to minimize torque effect. Don't forget to also reverse the blades position and deploy direction or your plane will just spin on the runway. High engine torque allows it to be used in various non-aircraft related contraptions instead of rotors.
Trivia
Despite the name it's appearance and function resembles more of a turboprop engine
Changes
- Initial Release
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