TT-38K Radial Decoupler (Demo)

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The TT-38K Radial Decoupler is a Decoupler that allows for staging rockets horizontally and in parallel.


The TT-38K adds a stage to the rocket and when activated will jettison the Decoupler as well as anything attached to it, much like the TR-18A. In the past Liquid Fuel system modules could not be attached to a TT-38K, however you could attach TT-38K's to Liquid Fuel system modules. An easy workaround used by many was simply attaching a Solid Rocket Booster to the TT-38K and then stacking Liquid Fuel system modules below.

Since version 0.13 however the stock liquid fuel systems have been radially attachable and either fuel engines below them, or through use of the FTX-2 External Fuel Duct fuel line, also introduced in this version.

Radial Symmetry

In game Symmetry Modifier

Unlike a stack decoupler, a radial decoupler can be combined with symmetry to an interesting effect. Using the symmetry feature found in the VAB, one can attach 2-8 symmetrical pieces onto their main fuel engine, to allow for more balance in precision in placing your initial booster stages. See example. Pieces however, whose collision mesh collide with one another will not stay onto their respective decoupler; this means you'll have to use fewer decouplers per stage, and more stages if you want more pieces.


The TT-38K Radial Decoupler, like most other decouplers, is equipped with a (hopefully) small explosive charge, that will sever the structural linkage between itself and whatever it's connected to.

O.M.B. Demolition Enterprises


→ See also: Version History


  • Removed parent-wise fuel crossfeed from Radial Decouplers. Fuel Lines made that obsolete.


  • (undocumented) EjectionForce decreased from 15 to 5.


  • (undocumented) Radial decouplers can now cross-feed fuel.


  • Radial decouplers now have their own module (they used to share modules with the stack decoupler)
  • Tweaked the Radial Decoupler separation. It can now eject lit SRBs safely away from the ship and not kill the crew every time.


  • Initial Release

Template:Demo Parts