TR-18A Stack Decoupler

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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
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
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