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| − | {{:LV-909 Liquid Fuel Engine/Box}}
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| − | The '''LV-909 Liquid Fuel Engine''' is a [[liquid fuel engine]].
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| − | == Usage ==
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| − | The LV-909 is a liquid fuel engine with thrust vector control, allowing efficient control of the rocket when it is most needed: during ascent, descent, and orbit correction burns. It has a slightly better specific impulse in vacuum than [[LV-T30 Liquid Fuel Engine|LV-T30]] and [[LV-T45 Liquid Fuel Engine|LV-T45]] engines and is much smaller and lighter than them, but it has dramatically less thrust. The low thrust makes the LV-909 unsuitable as a main engine on most lower stages, but the low mass allows for more efficient upper stages. Furthermore, the LV-909 is short enough that [[LT-1 Landing Strut]]s can extend past it. Because of this, the LV-909 is a good choice for lander engines.
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| − | Like LV-T30 and -45, the LV-909 cannot be placed on [[radial decoupler]]s. The LV-909 must be directly below a non-empty liquid fuel tank, or fed by an [[FTX-2 External Fuel Duct|fuel line]], to produce any thrust.
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| − | The thrust vectoring on this engine tends to be less useful than on the LV-T45, due to the LV-909's reduced gimbal range and the fact that it is often used on lighter rockets, which can be turned easily by the [[SAS]] torque provided by the command pod or probe body.
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| − | Be aware that unlike the LV-T30 and -45, the LV-909 does not produce electric charge.
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| − | == Product description ==
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| − | The LV-909 is one of the few parts in Kerbal Space Program that is covered in [[w:Multi-layer insulation|multi-layer insulation]].
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| − | [[File:LV909.png|thumb|right|Pre-0.18 appearance]]
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| − | {{Quote
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| − | |The 909 model was initially received with some skepticism by spacecraft engineers, as it defied the long-standing convention that "More Power!" is always better. Despite this, the 909 series has found its place in the spacecraft construction world, being particularly useful as a final stage and landing engine.
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| − | == Changes ==
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| − | ;[[0.18]]
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| − | * New, higher quality model applied.
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| − | ;[[0.17]]
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| − | * Max thrust increased from 20 to 50; vacuum ISP reduced from 400 to 390.
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| − | ;[[0.14]]
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| − | * Initial Release
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| − | {{Parts}}
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| − | [[Category:Demo parts]]
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| − | [[Category:Liquid fuel engines]]
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