FL-R120 RCS Fuel Tank

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FL-R120 RCS Fuel Tank
Part image
Monopropellant tank by
Jebediah Kerman's Junkyard and Spacecraft Parts Co

Radial size Small
Cost (total) 330.00 Funds
(dry) 186.00 Funds
Mass (total) 0.56 t
(dry) 0.08 t
Drag 0.2
Max. Temp. 2000 K
Volume  ?
Impact Tolerance 12 m/s
Research Advanced fuel systems.png Adv. Fuel Systems
Unlock cost 4 600 Funds
Since version 0.11.0
Part configuration RCSFuelTankR25.cfg
Monopropellant 120 Units of fuel

The FL-R120 RCS Fuel Tank (originally the FL-R25 RCS Fuel Tank) stores monopropellant for a spaceship's RCS.


Labels on the fuel tank say ominous words like DANGER EXTREME COLD or FILL POINT

The fuel tank provides fuel for all RCS thrusters of the ship. There is no need to place the thrusters directly on the tank. If there are several RCS fuel tanks the lowest will be used first to avoid jettisoning full tanks while preserving empty ones. Similarly, RCS tanks are emptied radially from the outside in. Within a stage, radial position takes precedence over vertical.

Product description

These fuel tanks store monopropellant for RCS thrusters. New advances in plumbing technology made it possible to route RCS lines to any point in the ship. So unlike liquid fuel tanks, RCS Fuel tanks can be placed anywhere.

Jebediah Kerman's Junkyard and Spacecraft Parts Co


Prior to version 0.90.0, somewhat counter-intuitively, two FL-R20 RCS Fuel Tank contained the same amount of monopropellant as a single FL-R120, yet saved 0.05 units of dry mass. The smaller tanks can also be placed radially, which made them the better choice for nearly all applications. Since v0.90.0, the FL-R120 holds slightly more than three times as much monopropellant, with similarly greater mass, edging out the equivalent in FL-R20 by 0.006 units, saving about 0.5% overall.


  • Renamed from FL-R25 RCS Fuel Tank to FL-R120 RCS Fuel Tank
  • Increased tech cost from 2400 to 4600
  • Decreased cost from 600 to 330
  • Decreased mass from 0.15 to 0.08
  • Monopropellant supply decreased from 250 to 120
  • Monopropellant supply increased from 100 to 250
  • Capacity increased to 100, description changed.
  • Retextured, capacity decreased to 25
  • Due to part rebalancing, mass reduced from 0.9 to 0.5, empty mass from 0.15 to 0.1, fuel units from 250 to 200 (This does make the name slightly less meaningful)
  • RCS Fuel Tanks now drain symmetrically if placed using symmetry.
  • Initial release