Difference between revisions of "LFB KR-1x2 "Twin-Boar" Liquid Fuel Engine"

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{{:LFB KR-1x2/Box}}
 
{{:LFB KR-1x2/Box}}
The '''LFB KR-1x2''' is the first part that contains both: a [[liquid fuel tank]] and a [[liquid fuel engine]]. Usually only [[solid rocket booster]]s using [[solid fuel]] contain both, because solid fuel can't be transferred. Unlike solid rocket boosters this liquid fuel booster can run longer by pumping additional liquid fuel and oxidizer to the part. It can also be throttled, both: using main throttle and thrust limiter [[tweakable]]. Minimum thrust required for booster to lift its own weight is 17.5%.
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The '''LFB KR-1x2 "Twin-Boar" Liquid Fuel Engine''' is a [[liquid fuel tank]] and a [[liquid fuel engine]]. Usually only [[solid rocket booster]]s using [[solid fuel]] contain both the fuel and engine in one part, as solid fuel can't be transferred. Unlike solid rocket boosters this liquid fuel booster can run longer by pumping additional liquid fuel and oxidizer to the part. It is also throttleable, both by the main throttle and a thrust limiter [[tweakable]]. The minimum thrust level required for this booster to lift its own laden weight is 17.5%.
  
This booster contains two engines at the bottom which are added radially, so the base of the booster is wider than a usual large tank. It also does not allow any parts to be attached below it. It contains the same amount of fuel as the [[Rockomax Jumbo-64 Fuel Tank]]. The thrust is higher than the [[Rockomax "Mainsail" Liquid Engine]] and is thus the most powerful large-sized engine. However, its [[specific impulse|I<sub>sp</sub>]] is significantly (30 s) lower than that of the Mainsail at all altitudes.
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The name ''LFB KR-1x2'' might be a reference to the ''Advanced Boosters'', a future [[w:Space Launch System|Space Launch System]] Block 2 component.
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This booster contains two engines at the bottom which are added radially, so the base of the booster is wider than a usual large tank. It also does not allow any parts to be attached below it. It contains the same amount of fuel as the [[Rockomax Jumbo-64 Fuel Tank]] (2880). The thrust is higher than the [[Rockomax "Mainsail" Liquid Engine]] and is thus the most powerful large-sized engine. However, its [[specific impulse|I<sub>sp</sub>]] is slightly (5-10 s) lower than that of the Mainsail at all altitudes.
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The ''LFB KR-1x2'' is the only part that is simultaneously a liquid fuel tank and engine.
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== Usage ==
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The ''LFB KR-1x2'' is an unusually good engine, once the weight and cost of the fuel + tankage is subtracted out it weighs almost the same as a Mainsail, but has 33% more thrust while actually being 13% ''cheaper''.  It's similar to a pair of lower-efficiency Vectors.  The Twin-Boar also has highest thrust to weight ratio of any liquid fuel engine in the game and the second highest thrust to cost ratio, second only to the [[LV-T30_"Reliant"_Liquid_Fuel_Engine|LV-T30 "Reliant"]].  This makes it an excellent and cost-effective mid-game launcher for larger payloads.
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It is also the best engine in the game for first stage recovery, it has a high impact tolerance of 20m/s and being very tall makes it extremely buoyant in case of a splashdown, this allows skimping on parachutes. Even in the case of a bad landing which results in partial disintegration of the rest of the stage the integrated fuel tank is always recovered so the recovery percentage in case of a crash landing is higher than for other engines.
  
 
== Product description ==
 
== Product description ==
{{Quote|Эта система ускорителей на жидком топливе была разработана, чтобы допустить более хорошее управление пусками, вместо того, чтобы положиться исключительно на единственный двигатель и твердотопливные ракетные ускорители, которая использует два измененных двигателя "KR-1" в качестве источника своей огромной подъемной силы.}}
 
  
{{Quote|Эта система ускорителей на жидком топливе - очень целеустремленная часть разработки. Вместо того, чтобы положиться на единственные двигатели или твердотопливные ракетные ускорители, "KR-1x2" использует два измененных двигателя "KR-1", питаемых встроенной топливной системой, в качестве источника своей огромной подъемной силы. Все эти отдельные улучшения учитываются в стоимости, отсутствие точки крепления на его нижней стороне и невозможность быть настолько же эффективным как указанные двигатели. Это также учитывается во вполне буквальной стоимости.|Kerbodyne 0.24}}
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{{Quote|This liquid fuel booster system is a very purposeful piece of engineering. Instead of relying on single engines or solid rocket boosters, the KR-1x2 employs two modified KR-1 engines, fed by a built-in fuel system, as the source of its immense lifting power. All that self-contained goodness comes at the cost of not having a mounting point for its underside, and not being quite as efficient as dedicated engines. It also comes at quite a literal cost as well.|Kerbodyne 0.24}}
  
 
== Changes ==
 
== Changes ==
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{{Parts}}
 
{{Parts}}
 
[[Category:Liquid fuel engines]]
 
[[Category:Liquid fuel engines]]
[[Category:Liquid fuel tanks]]
 

Revision as of 06:42, 22 December 2018

LFB KR-1x2 "Twin-Boar" Liquid Fuel Engine
Part image
Liquid fuel engine by
Kerbodyne

Radial size Large, Radial mounted
Cost (total) 17 000.00 Funds
(dry) 14 062.40 Funds
Mass (total) 42.50 t
(dry) 10.50 t
Drag 0.2
Max. Temp. 2000 K
Volume  ?
Impact Tolerance 20 m/s
Research Heavier rocketry.png Heavier Rocketry
Unlock cost 65 000 Funds
Since version 0.23.5
Part configuration part.cfg
Liquid fuel engine
Maximum thrust (1 atm) 1 866.67 kN
(vacuum) 2 000.00 kN
Isp (1 atm) 280 s
(vacuum) 300 s
Fuel consumption 135.96 Units of fuel/s


Thrust vectoring 1.5 °
Liquid fuel tank
Liquid fuel 2 880 Units of fuel
Oxidizer 3 520 Units of fuel


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 LFB KR-1x2 "Twin-Boar" Liquid Fuel Engine is a liquid fuel tank and a liquid fuel engine. Usually only solid rocket boosters using solid fuel contain both the fuel and engine in one part, as solid fuel can't be transferred. Unlike solid rocket boosters this liquid fuel booster can run longer by pumping additional liquid fuel and oxidizer to the part. It is also throttleable, both by the main throttle and a thrust limiter tweakable. The minimum thrust level required for this booster to lift its own laden weight is 17.5%.

The name LFB KR-1x2 might be a reference to the Advanced Boosters, a future Space Launch System Block 2 component.

This booster contains two engines at the bottom which are added radially, so the base of the booster is wider than a usual large tank. It also does not allow any parts to be attached below it. It contains the same amount of fuel as the Rockomax Jumbo-64 Fuel Tank (2880). The thrust is higher than the Rockomax "Mainsail" Liquid Engine and is thus the most powerful large-sized engine. However, its Isp is slightly (5-10 s) lower than that of the Mainsail at all altitudes.

The LFB KR-1x2 is the only part that is simultaneously a liquid fuel tank and engine.

Usage

The LFB KR-1x2 is an unusually good engine, once the weight and cost of the fuel + tankage is subtracted out it weighs almost the same as a Mainsail, but has 33% more thrust while actually being 13% cheaper. It's similar to a pair of lower-efficiency Vectors. The Twin-Boar also has highest thrust to weight ratio of any liquid fuel engine in the game and the second highest thrust to cost ratio, second only to the LV-T30 "Reliant". This makes it an excellent and cost-effective mid-game launcher for larger payloads.

It is also the best engine in the game for first stage recovery, it has a high impact tolerance of 20m/s and being very tall makes it extremely buoyant in case of a splashdown, this allows skimping on parachutes. Even in the case of a bad landing which results in partial disintegration of the rest of the stage the integrated fuel tank is always recovered so the recovery percentage in case of a crash landing is higher than for other engines.

Product description

This liquid fuel booster system is a very purposeful piece of engineering. Instead of relying on single engines or solid rocket boosters, the KR-1x2 employs two modified KR-1 engines, fed by a built-in fuel system, as the source of its immense lifting power. All that self-contained goodness comes at the cost of not having a mounting point for its underside, and not being quite as efficient as dedicated engines. It also comes at quite a literal cost as well.

Kerbodyne 0.24

Changes

0.24
  • Changed cost (5900 -> 16400), reduced Isp from 320-360 s to 290-340 s, changed description.
0.23.5
  • Initial release