TR-18A Stack Decoupler

From Kerbal Space Program Wiki
Jump to: navigation, search
As of version 1.4 this decoupler is only available via pre-made crafts. The decoupler is replaced by the new TD-12 Decoupler.
TR-18A Stack Decoupler
Part image
Decoupler by
O.M.B. Demolition Enterprises
Cost (total) 400.00 Funds
Mass (total) 0.05 t
Drag 0.2
Max. Temp. 2000 K
Volume  ?
Impact Tolerance 9 m/s
Research Engineering 101.png Engineering 101
Unlock cost 1 200 Funds
Since version 0.7.3
Part configuration decouplerStackTR-18A.cfg
Ejection momentum 2500 Ns
Testing Environments
On the surface Yes
In the ocean Yes
On the launchpad Yes
In the atmosphere Yes
Sub orbital No
In an orbit No
On an escape No
Docked No
Test by staging Yes
Manually testable No

The TR-18A Stack Decoupler is a Decoupler that allows for staging rockets vertically and in sequence. It is also the only stack decoupler in the demo version of the game.


The TR-18A adds a stage to the rocket and when activated will jettison anything attached to it. Unlike the TR-18D, the TR-18A remains attached to one side of the rocket - the side facing away from the arrow on the decoupler. It is primarily used for jettisoning spent stages or drop tanks with a 1.25m node.

Product description

The TR-18A Stack Decoupler is equipped with a (hopefully) small explosive charge, that will sever the structural linkage between itself and whatever it's connected to. Painted on its sides are handy arrows indicating which side will detach.


  • Hidden from tech tree and part list
  • New model and texture
  • (undocumented) Stack Decouplers no longer cross-feed fuel by default.
  • Decouplers now obey the second law of physics (Acceleration = Force/Mass)
  • (unimplemented) Increased the ejection force of Decouplers and Radial Decouplers (too underpowered after the physics fix).
  • (undocumented) Decouplers can now cross-feed fuel.
  • Stage decouplers can now share fuel across stages.
  • Fixed a bug where creating a new stage with a decoupler and then removing it would generate errors.
  • Initial Release