LV-909 "Terrier" Liquid Fuel Engine

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LV-909 "Terrier" Liquid Fuel Engine
Part image
Liquid fuel engine by
Jebediah Kerman's Junkyard and Spacecraft Parts Co
Radial size Small
Cost (total) 390.00 Funds
Mass (total) 0.50 t
Drag 0.2
Max. Temp. 2000 K
Impact Tolerance 7 m/s
Research Advanced rocketry.png Advanced Rocketry
Unlock cost 1 600 Funds
Since version 0.14
Part configuration liquidEngineLV-909
Liquid fuel engine
Maximum thrust (1 atm) 14.78 kN
(vacuum) 60.00 kN
Isp (1 atm) 85 s
(vacuum) 345 s
Fuel consumption 3.55 Units of fuel/s


Thrust vectoring 4 °
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 LV-909 "Terrier" Liquid Fuel Engine is a liquid fuel engine.

Usage

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 and 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 Struts can extend past it. Because of this, the LV-909 is a good choice for lander engines.

Like LV-T30 and -45, the LV-909 cannot be placed on radial decouplers. The LV-909 must be directly below a non-empty liquid fuel tank, or fed by a fuel line, to produce any thrust.

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.

Be aware that unlike the LV-T30 and -45, the LV-909 does not produce electric charge. Another source of power (even if just batteries) is therefore strongly recommended for any spacecraft that uses it.

Prior to version 1.6, the LV-909 was one of the few parts in Kerbal Space Program covered in multi-layer insulation.

Product description

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.

Variants

As of version 1.6 this engine has three models that can be switched in the editor.

Shroud variant
TrussMount variant
Bare variant
The different variants of the engine
Pre-0.18 appearance
Pre-1.6 appearance

Changes

1.6
  • New model and texture
  • Added 3 variants
0.18
  • New, higher quality model applied.
0.17
  • Max thrust increased from 20 to 50; vacuum ISP reduced from 400 to 390.
0.14
  • Initial Release