Mk2 Bicoupler

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Mk2 Bicoupler
Part image
Liquid fuel tank by
C7 Aerospace Division

Radial size Mk2, Small, Radial mounted
Cost (total) 860.00 Funds
(dry) 676.40 Funds
Mass (total) 2.29 t
(dry) 0.29 t
Drag 0.3-0.2
Max. Temp. 2500 K
Volume  ?
Impact Tolerance 50 m/s
Research Supersonic flight.png Supersonic Flight
Unlock cost 19 800 Funds
Since version 0.25
Part configuration bicoupler.cfg
Outgoing connectors 2
Liquid fuel 180 Units of fuel
Oxidizer 220 Units of fuel
Lift generated 0.3

The Mk2 Bicoupler is a Mk2 to 1.25m adapter and fuel tank containing liquid fuel and oxidizer mixture.

It has the same length, mass, and fuel capacity as the Mk2 Rocket Fuel Fuselage Short and the Mk2 to 1.25m Adapter.

Product description

One engine is not enough? We got you covered!

C7 Aerospace Division


The Mk2 Bicoupler's shape serves two purposes: connecting Mk2 radial sized parts to 1.25m parts (like the Mk2 to 1.25m Adapter), and serving as a bicoupler (like the TVR-200 Stack Bi-Coupler). Unlike other adapters, the Mk2 Bicoupler has straight sides, allowing it to serve as an aligned attachment point for wings, fins, and landing gear.

Because the Mk2 Bicoupler is a Mk2 part, it can act as a wing by providing a lifting surface. However, it provides less lift than a true Mk2 fuselage, such as the Mk2 Rocket Fuel Fuselage Short.

The Mk2 Bicoupler is also a rocket fuel tank containing liquid fuel and oxidizer. It can be used to power liquid fuel rocket engines, like the LV-909 "Terrier" Liquid Fuel Engine. It can be placed both in-line and radially mounted.

When full, one tank can power a single LV-909 "Terrier" Liquid Fuel Engine for up to 112.8 seconds at full thrust, or a single closed-cycle CR-7 R.A.P.I.E.R. Engine for up to 33.2 seconds at full thrust.

One of the most apparent usages of the Mk2 Bicoupler is to attach two engines at the back of an aircraft. Other uses include adding pairs of intakes.


  • The Mk2 Bicoupler originated in the Spaceplane Plus mod, which was integrated into KSP 0.25.


  • Initial Release