Kerbodyne KR-2L+ "Rhino" Liquid Fuel Engine

Kerbodyne KR-2L+ "Rhino" Liquid Fuel Engine
Liquid fuel engine by Kerbodyne
Radial size		Extra large
Cost	(total)	25 000.00
Mass	(total)	9.000 t
Drag		0.2
Max. Temp.		2000 K
Impact Tolerance		7 m/s
Research		Very Heavy Rocketry
Unlock cost		68 000
Since version		0.23.5
Part configuration		part.cfg
Maximum thrust	(1 atm)	1 205.88 kN
	(vacuum)	2 000.00 kN
Isp	(1 atm)	205 s
	(vacuum)	340 s
Fuel consumption		119.97 /s
Thrust vectoring		4 °
Electricity generated		12.0 ⚡/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

The Kerbodyne KR-2L+ "Rhino" Liquid Fuel Engine is an extra large liquid fuel engine which has a high specific impulse compared to the thrust. While the specific impulse is lower than the Rockomax "Mainsail" Liquid Engine in atmosphere, the I_sp in vacuum is higher than most of the engines, including the Mainsail and Rockomax "Skipper" Liquid Engine. Only the LV-N Atomic Rocket Motor, Toroidal Aerospike Rocket, LV-909 Liquid Fuel Engine and Rockomax "Poodle" Liquid Engine are more efficient, but only have 12.5% (at most) of this engine's thrust.

The KR-2L might be a reference to the J-2X, a planned upper stage engine for Space Launch System.

This, and the fact that it allows attaching parts on both sides of the engine, make it a very useful engine for high-mass upper stages. Especially because the S3 KS-25x4 Engine Cluster is the only other extra large engine in 0.25 but doesn't allow attaching parts below the engine. It has the second-highest vacuum thrust of all engines available, after the S3 KS-25x4 "Mammoth" Liquid Fuel Engine and tied with the LFB KR-1x2 "Twin-Boar" Liquid Fuel Engine, though the Twin-Boar has better atmospheric thrust.^[outdated]

The fact that the S3 KS-25x4 "Mammoth" Liquid Fuel Engine, although it is on part part in-game, is technically just four Vector Engines, and the LFB KR-1x2 "Twin-Boar" Liquid Fuel Engine, while only one part in-game, is technically two KR-1 Engines, makes this engine technically the largest single engine in the game.

Product description

“

This engine is Kerbodyne's first attempt at a highly advanced engine. The engineers couldn't get it to produce full efficiency at sea level without the engine exploding, so it was repurposed as an upper stage engine. The experience gained here with high efficiency has been repurposed for later models, which feature multiple combustion chambers at higher pressure (that don't go boom). This engine is optimized for lighting mid-flight, although it still provides respectable power at sea level. — Kerbodyne

”

Changes

1.2

• Specific impulse at sea level decreased from 255 to 205.

1.0.3

• Cost increased from 21000 to 25000, mass increased from 8.5 to 9, specific impulse at sea level increased from 170 to 255.

0.24

• Cost increased from 2850 to 20850 (and made meaningful)

0.23.5

• Initial release