Mk2 to 1.25m Adapter

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Mk2 to 1.25m Adapter
Part image
Liquid fuel tank by
C7 Aerospace Division

Radial size Small, Mk2, Radial mounted
Cost (total) 550.00 Funds
(dry) 366.40 Funds
Mass (total) 2.29 t
(dry) 0.29 t
Drag 0.1-0.2
Max. Temp. 2500 K
Volume  ?
Impact Tolerance 50 m/s
Research Supersonic flight.png Supersonic Flight
Unlock cost 14 600 Funds
Since version 0.25
Part configuration standard.cfg
Liquid fuel 180 Units of fuel
Oxidizer 220 Units of fuel
Lift generated 0.28

The Mk2 to 1.25m Adapter (formerly the Mk2 to size 1 Adapter) 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 Bicoupler.

Product description

Generic Mk2 to Mk1 adapter.

C7 Aerospace Division


The Mk2 to 1.25m Adapter is used to provide a seamless connection between Mk2 and 1.25m parts, allowing parts such as engines, fuel tanks, reaction wheels, or command modules to be attached to a Mk2 craft (such as a spaceplane). It also serves as an attachment point for wings, fins, and landing gear; however, its angled sides may cause alignment issues.

Because the Mk2 to 1.25m Adapter 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 to 1.25m Adapter 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.


  • The Mk2 to 1.25m Adapter was originally developed for the C7 Spaceplane pack, and has become a stock part since version 0.15 and the introduction of the Spaceplane Hangar.


  • New model and texture
  • Initial release