Difference between revisions of "RK-7 "Kodiak" Liquid Fueled Engine"

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(Changed instances of the word “Russian” relating to the construction of the RD-107 to “Soviet,” as to not discount the engineers from the other republics who likely assisted with the project (Eg: Ukraine, Kazakhstan, Belarus etc.))
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{{:RK-7 "Kodiak" Liquid Fueled Engine/Box}}
 
{{:RK-7 "Kodiak" Liquid Fueled Engine/Box}}
  
The '''RK-7 "Kodiak"''' is a liquid fueled engine similar in performance to the [[LV-T30 "Reliant" Liquid Fuel Engine]], but with a "Soviet" theme. It allows for greater visual and thematic variety in Making History scenarios, and usually is used in conjunction with the [[RV-1]] vernier.
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The '''RK-7 "Kodiak"''' is a liquid fueled engine similar to the [[LV-T30 "Reliant" Liquid Fuel Engine]], but with improved first-stage performance and a "Soviet" theme.
  
 
== Usage ==
 
== Usage ==
Prior to 1.6, the RK-7's thrust, mass, Isp, and lack of vectoring make it almost identical (if more expensive) than the LV-T30, meaning it can in principle be used in the same situations. The high cost and position on the tech tree, however, make it an inferior choice in most situations.
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The Kodiak has the same weight and cost as the Reliant, but its atmospheric [[specific impulse]] is 7.5% higher, and it can burn fuel 12% faster; these combine to give it 20% higher thrust at sea level. Its high atmospheric thrust-to-weight ratio is only outmatched by five engines, all of which are much more expensive.
  
After changes in 1.6, RK-7 have an increase in thrust, giving it a better ASL TWR and ISP, while the cost is lowered to make it identical to LV-T30. While it still high on the tech tree, due to its lower cost compare to vector and possibly better TWR than Skiff (craft dependent), once aesthetic is ignored it becomes a good engine for use in career mode.
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Its vacuum I<sub>sp</sub> is lower than the Reliant's; the crossover in Kerbin's atmosphere is at 7km above sea level. So the Kodiak is best used as a first stage engine or a liquid booster. (Particularly, it can be attached to the [[FL-C1000 Fuel Tank]], imitating the appearance and role of the [[w:R-7 (rocket family) | Soviet R-7 boosters]] which inspired both of these Kerbal parts.)
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The Kodiak has no thrust vectoring / gimbal range. Visually, it is meant to pair well with the [[RV-1 "Cub" Vernier Engine]], which imitates Soviet vernier engines from the same era.
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The Kodiak does have the disadvantage of being unlocked late in the tech tree (level 6, versus the Reliant's level 3). It was also considerably less useful prior to the changes made in version 1.6.
  
 
== Product description ==
 
== Product description ==
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== Variants ==
 
== Variants ==
As of {{version|1.4.1}} this engine has three models that can be switched in the editor.
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This engine has three models that can be switched in the editor. The Bare and Shroud Big variants are [[radial size]] medium, while the Shroud Small is size small.
  
 
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== Trivia ==
 
== Trivia ==
While bears are often used as a symbol of Russia, [[https://en.wikipedia.org/wiki/Kodiak_bear kodiaks]] live exclusively in the United States.
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While bears are often used as a symbol of Russia, [[w:Kodiak bear | Kodiaks]] live exclusively in the United States.
  
 
=== Real-world comparison ===
 
=== Real-world comparison ===

Latest revision as of 00:23, 7 October 2023

RK-7 "Kodiak" Liquid Fueled Engine
Part image
Liquid fuel engine by
Reaction Systems Ltd

Radial size Medium, Radial mounted
Cost (total) 1 100.00 Funds
Mass (total) 1.250 t
Drag 0.3-0.2
Max. Temp. 2000 K
Impact Tolerance 9 m/s
Research Heavier rocketry.png Heavier Rocketry
Unlock cost 4 400 Funds
Since version 1.4.1
Part configuration LiquidEngineRK-7.cfg
Maximum thrust (1 atm) 247.00 kN
(vacuum) 260.00 kN
Isp (1 atm) 285 s
(vacuum) 300 s
Fuel consumption 17.68 Units of fuel/s
Thrust vectoring No
Electricity generated 5.0 ⚡/s
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
Packed volume None

The RK-7 "Kodiak" is a liquid fueled engine similar to the LV-T30 "Reliant" Liquid Fuel Engine, but with improved first-stage performance and a "Soviet" theme.

Usage

The Kodiak has the same weight and cost as the Reliant, but its atmospheric specific impulse is 7.5% higher, and it can burn fuel 12% faster; these combine to give it 20% higher thrust at sea level. Its high atmospheric thrust-to-weight ratio is only outmatched by five engines, all of which are much more expensive.

Its vacuum Isp is lower than the Reliant's; the crossover in Kerbin's atmosphere is at 7km above sea level. So the Kodiak is best used as a first stage engine or a liquid booster. (Particularly, it can be attached to the FL-C1000 Fuel Tank, imitating the appearance and role of the Soviet R-7 boosters which inspired both of these Kerbal parts.)

The Kodiak has no thrust vectoring / gimbal range. Visually, it is meant to pair well with the RV-1 "Cub" Vernier Engine, which imitates Soviet vernier engines from the same era.

The Kodiak does have the disadvantage of being unlocked late in the tech tree (level 6, versus the Reliant's level 3). It was also considerably less useful prior to the changes made in version 1.6.

Product description

A bear of an engine. This quad-nozzled beast comes with multiple cowling options, and no gimbal. Don’t forget those verniers.

Reaction Systems Ltd

Variants

This engine has three models that can be switched in the editor. The Bare and Shroud Big variants are radial size medium, while the Shroud Small is size small.

Bare variant
ShroudBig variant
ShroudSmall variant
The different variants of the engine

Trivia

While bears are often used as a symbol of Russia, Kodiaks live exclusively in the United States.

Real-world comparison

The RK-7 was inspired by the Soviet RD-107 engine.

Changes

1.6
  • Increased unlock cost from 4200 to 4400
  • Decreased cost from 1300 to 1100
  • Increased crash tolerance from 6 to 9
  • Increased EC generation from 3 to 5
  • Increased ASL thrust to 247
  • Increased vacuum thrust from 240 to 260
  • Improved Isp
1.4.5
  • Added ModuleTestSubject
1.4.1
  • Initial Release