Difference between revisions of "LV-T45 "Swivel" Liquid Fuel Engine"

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{{:LV-T45 Liquid Fuel Engine/Box}}
 
{{:LV-T45 Liquid Fuel Engine/Box}}
  
The '''LV-T45 Liquid Fuel Engine''' is an engine which requires fuel from external liquid fuel tanks, and must be either connected beneath them or be on the receiving end of a fuel line.
+
The '''LV-T45 "Swivel" Liquid Fuel Engine''' is an engine which requires fuel from external liquid fuel tanks, and must be either connected beneath them or be on the receiving end of a fuel line.
 +
 
 +
It is similar in appearance to the RS-56-OSA core sustainer engine used by the late [https://en.wikipedia.org/wiki/Atlas_II Atlas II] rocket.
  
 
== Usage ==
 
== Usage ==
The LV-T45 was the first [[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 specific impulse as the [[LV-T30 Liquid Fuel Engine]], the more complex LV-T45 has slightly less thrust resulting in a longer burn time at the same fuel amount. Parallel ignition of several LV-T30 and LV-T45 engines at lift-off can lead to maximized thrust without losing control.
 
  
However, the LV-T45 has a mass of 1.5 tons and as said before, less thrust compared to the LV-T30, which masses 1.25 tons. This means a worse TWR.  
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The LV-T45 is similar to the [[LV-T30 Liquid Fuel Engine]], but with a slightly smaller thrust chamber, higher expansion ratio, and thrust vector control. Its slightly reduced thrust and considerably increased mass reduces its specific thrust, making it less suitable for first stages.  It is best suited in second stages and the core stage of parallel lift-off configurations, where longer operating times and higher altitudes bring out this engine's advantage in specific impulse.
  
Like LV-T30, the LV-T45 cannot be placed on radial [[decoupler]]s and are typically reserved as a main engine after lift-off. The LV-T45 must be directly below a non-empty fuel tank to produce any thrust.
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There are two excellent applications of this engine: in the core stage of parallel booster configurations, where its thrust vector control allows active control of a vehicle powered chiefly by LV-T30 or [[BACC "Thumper" Solid Fuel Booster|BACC "Thumper"]] solid boosters for lift-off, followed by the LV-T45 engine(s) continuing to operate after the strap-on stages have depleted and separated.  And in the second stage of an aerodynamically stabilized booster started aloft using a suitable solid motor stage where the operation of the first stage is controlled by reaction wheels or the first stage burns out prior to the commencement of the gravity turn.
  
== Description ==
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== Product description ==
 
{{Quote
 
{{Quote
|The LV-T45 engine was considered another breakthrough in the LV-T series, due to its Thrust Vectoring feature. The LV-T45 can deflect its thrust to aid in craft control. All these added mechanics however, make for a slightly smaller and less powerful engine in comparison with earlier LV-T models.
+
|The LV-T45 engine was considered a breakthrough in the LV-T series due to its Thrust Vectoring feature. The LV-T45 can deflect its thrust to aid in craft control. All these added mechanics however, make for a slightly smaller and heavier engine in comparison with other LV-T models.|manufacturer=JKJSP
|Jebediah Kerman's Junkyard and Spaceship Parts Co.}}
+
}}
 
 
[[File:LTV45.png|thumb|right|Pre-0.18 appearance]]
 
  
 
== Changes ==
 
== Changes ==
;{{Version|0.22|}}
+
;[[1.2]]
 +
* Atmospheric Isp decreased from 270 to 250.
 +
* Thrust increased from 200 to 215.
 +
;[[1.0]]
 +
* Isp decreased from 370 s (vacuum) / 320 s (1 atm) to 320 s (vacuum) / 270 s (1 atm)
 +
* Gimbal range increased from 1° to 3°
 +
* Cost increased from 950 to 1200
 +
;[[0.22]]
 
* Electricity production increased to 6.0
 
* Electricity production increased to 6.0
;{{Version|0.18|}}
+
;[[0.18]]
* Retextured
+
[[File:LTV45.png|thumb|right|Pre-0.18 appearance]]
 +
* New model and texture
 
* Alternator added, engine now gains 1.0 electricity
 
* Alternator added, engine now gains 1.0 electricity
;{{Version|0.16|}}
+
;[[0.16]]
 
* Major CFG revision (most notably Isp added)
 
* Major CFG revision (most notably Isp added)
;{{Version|0.12|}}
+
;[[0.12]]
 
* Initial Release
 
* Initial Release
  

Latest revision as of 00:46, 6 July 2017

LV-T45 "Swivel" Liquid Fuel Engine
Part image
Liquid fuel engine by
Jebediah Kerman's Junkyard and Spacecraft Parts Co
Radial size Small
Cost (total) 1 200.00 Funds
Mass (total) 1.50 t
Drag 0.2
Max. Temp. 2000 K
Impact Tolerance 7 m/s
Research Basic rocketry.png Basic Rocketry
Unlock cost 3 500 Funds
Since version 0.12
Part configuration liquidEngineLV-T45
Liquid fuel engine
Maximum thrust (1 atm) 167.97 kN
(vacuum) 215.00 kN
Isp (1 atm) 250 s
(vacuum) 320 s
Fuel consumption 13.70 Units of fuel/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 LV-T45 "Swivel" Liquid Fuel Engine is an engine which requires fuel from external liquid fuel tanks, and must be either connected beneath them or be on the receiving end of a fuel line.

It is similar in appearance to the RS-56-OSA core sustainer engine used by the late Atlas II rocket.

Usage

The LV-T45 is similar to the LV-T30 Liquid Fuel Engine, but with a slightly smaller thrust chamber, higher expansion ratio, and thrust vector control. Its slightly reduced thrust and considerably increased mass reduces its specific thrust, making it less suitable for first stages. It is best suited in second stages and the core stage of parallel lift-off configurations, where longer operating times and higher altitudes bring out this engine's advantage in specific impulse.

There are two excellent applications of this engine: in the core stage of parallel booster configurations, where its thrust vector control allows active control of a vehicle powered chiefly by LV-T30 or BACC "Thumper" solid boosters for lift-off, followed by the LV-T45 engine(s) continuing to operate after the strap-on stages have depleted and separated. And in the second stage of an aerodynamically stabilized booster started aloft using a suitable solid motor stage where the operation of the first stage is controlled by reaction wheels or the first stage burns out prior to the commencement of the gravity turn.

Product description

The LV-T45 engine was considered a breakthrough in the LV-T series due to its Thrust Vectoring feature. The LV-T45 can deflect its thrust to aid in craft control. All these added mechanics however, make for a slightly smaller and heavier engine in comparison with other LV-T models.

Jebediah Kerman's Junkyard and Spacecraft Parts Co

Changes

1.2
  • Atmospheric Isp decreased from 270 to 250.
  • Thrust increased from 200 to 215.
1.0
  • Isp decreased from 370 s (vacuum) / 320 s (1 atm) to 320 s (vacuum) / 270 s (1 atm)
  • Gimbal range increased from 1° to 3°
  • Cost increased from 950 to 1200
0.22
  • Electricity production increased to 6.0
0.18
Pre-0.18 appearance
  • New model and texture
  • Alternator added, engine now gains 1.0 electricity
0.16
  • Major CFG revision (most notably Isp added)
0.12
  • Initial Release