Difference between revisions of "LV-909 "Terrier" Liquid Fuel Engine"

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{{Partbox
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{{:LV-909 "Terrier" Liquid Fuel Engine/Box}}
|Name=LV-909 Liquid Fuel Engine
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|Role=Liquid Fuel Engine
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The '''LV-909 "Terrier" Liquid Fuel Engine''' is a [[Radial size|1.25m]] [[liquid fuel engine]], with a high vacuum [[specific impulse]] and fuel efficiency.
|Class=LiquidEngine
 
|File=LV-909 Liquid Fuel Engine.png
 
|Costs=750
 
|Mass=0.5
 
|More=
 
{{PB-more|Minimum Thrust|0 N}}
 
{{PB-more|Maximum Thrust|50 N}}
 
{{PB-more|Fuel Consumption|2}}
 
{{PB-more|Gimbal Range|0.5}}
 
|since=v0.14.0
 
|cfg=Parts/liquidEngine3/part.cfg
 
}}
 
  
The '''LV-909 Liquid Fuel Engine''' is used to provide thrust to a rocket and is fueled by [[FL-T250 Fuel Tank]]s.
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== Product description ==
 +
{{Quote
 +
|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.
 +
|manufacturer=JKJSP}}
  
 
== Usage ==
 
== Usage ==
The LV-909 is the second [[Liquid Fuel]] engine with thrust vector control, that allows efficient control of the rocket when it is most needed - during ascent and orbit correction burns. Despite having the same fuel specific impulse as [[LV-T30 Liquid Fuel Engine|LV-T30]] and [[LV-T45 Liquid Fuel Engine|LV T-45 Liquid Fuel Engines]], the much smaller and lighter LV-909 has dramatically less thrust (and longer burn time at the same fuel amount). 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. More importantly, the LV-909 is short enough that [[LT-2 Landing Struts]] can extend past it. Because of this, the LV-909 is the primary choice for lander engines in 0.14.x.
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The Terrier is the first true vacuum engine unlocked in the [[tech tree]]. While its [[specific impulse]] (I<sub>sp</sub>) at sea level (85&nbsp;s) is unusably low, its vacuum I<sub>sp</sub> (345&nbsp;s) is significantly higher than almost any engine of its size (apart from the [[T-1 Toroidal Aerospike "Dart" Liquid Fuel Engine]]). In addition, it has the lowest mass of any [[Radial size|1.25m]] engine, lower than that of the [[LV-T30 "Reliant" Liquid Fuel Engine]] or [[LV-T45 "Swivel" Liquid Fuel Engine]]. This makes it the most efficient engine for many medium-size crafts; using a Terrier engine will help maximize available delta-V.
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 +
The Terrier is short enough that [[LT-1 Landing Strut]]s can extend past it. Combined with the Terrier's thrust vectoring, this makes it a good choice for lander engines. However, the Terrier's thrust is low; for large ships, it may not provide enough thrust in high-gravity environments.
 +
 
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The thrust vectoring on this engine tends to be less useful than on the Swivel, due to the Terrier'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 Swivel and Reliant, the Terrier does not have an alternator, meaning it cannot produce [[electric charge]]. Another source of power (even if just [[battery|batteries]]) is therefore strongly recommended for any spacecraft that uses it.
  
Like LV-T30 and -45, the LV-909 are not placeable on [[Radial Decouplers]]. The LV-909 must be directly below a non-empty [[FL-T500 Fuel Tank|FL-T500]] or [[FL-T250 Fuel Tank]], or fed by a [[FTX-2 External Fuel Duct|fuel line]] to produce any thrust.
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== Variants ==
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As of {{version|1.6}} this engine has three models that can be switched in the editor.
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 +
{{multiple image
 +
|align=left
 +
|width=200
 +
|image1=LV-909_Shroud.png
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|alt1=Shroud variant
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|image2=LV-909_TrussMount.png
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|alt2=TrussMount variant
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|image3=LV-909_Bare.png
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|alt3=Bare variant
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|footer=The different variants of the engine
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}}
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{{clear|left}}
  
The thrust vectoring on this engine tends to be less useful than on the LV-T45, due to both the reduced gimbal range, and use on lighter rockets.
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[[File:LV909.png|thumb|right|Pre-0.18 appearance]]
  
== Description ==
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[[File:LV-909_v1.5.png|thumb|right|Pre-1.6 appearance]]
{{Quote
 
|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.
 
|Jebediah Kerman's Junkyard and Spaceship Parts Co.}}
 
  
 
== Changes ==
 
== Changes ==
''see also: [[Version History]]''
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;[[1.6]]
; v0.14
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* New model and texture
* Part introduced
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* Added 3 variants
 
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;[[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
  
 
{{Parts}}
 
{{Parts}}
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[[Category:Demo parts]]
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[[Category:Liquid fuel engines]]

Latest revision as of 06:45, 21 September 2021

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
Volume  ?
Impact Tolerance 7 m/s
Research Advanced rocketry.png Advanced Rocketry
Unlock cost 1 600 Funds
Since version 0.14
Part configuration liquidEngineLV-909.cfg
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 1.25m liquid fuel engine, with a high vacuum specific impulse and fuel efficiency.

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.

Jebediah Kerman's Junkyard and Spacecraft Parts Co

Usage

The Terrier is the first true vacuum engine unlocked in the tech tree. While its specific impulse (Isp) at sea level (85 s) is unusably low, its vacuum Isp (345 s) is significantly higher than almost any engine of its size (apart from the T-1 Toroidal Aerospike "Dart" Liquid Fuel Engine). In addition, it has the lowest mass of any 1.25m engine, lower than that of the LV-T30 "Reliant" Liquid Fuel Engine or LV-T45 "Swivel" Liquid Fuel Engine. This makes it the most efficient engine for many medium-size crafts; using a Terrier engine will help maximize available delta-V.

The Terrier is short enough that LT-1 Landing Struts can extend past it. Combined with the Terrier's thrust vectoring, this makes it a good choice for lander engines. However, the Terrier's thrust is low; for large ships, it may not provide enough thrust in high-gravity environments.

The thrust vectoring on this engine tends to be less useful than on the Swivel, due to the Terrier'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 Swivel and Reliant, the Terrier does not have an alternator, meaning it cannot produce electric charge. Another source of power (even if just batteries) is therefore strongly recommended for any spacecraft that uses it.

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