RV-1 "Cub" Vernier Engine

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RV-1 "Cub" Vernier Engine
Part image
Liquid fuel engine by
Reaction Systems Ltd

Radial size Small
Cost (total) 800.00 Funds
Mass (total) 0.18 t
Drag 0.2-0.3
Max. Temp. 2000 K
Volume  ?
Impact Tolerance 7 m/s
Research Precision propulsion.png Precision Propulsion
Unlock cost 3 200 Funds
Since version 1.4.1
Part configuration LiquidEngineRV-1.cfg
Maximum thrust (1 atm) 28.90 kN
(vacuum) 32.00 kN
Isp (1 atm) 280 s
(vacuum) 310 s
Fuel consumption 2.11 Units of fuel/s

Thrust vectoring 22.5 °

The RV-1 "Cub" Vernier Engine is a small side-mounted engine that can be used for aesthetics, thrust augmentation, and additional thrust vector control. It is typically paired with the RK-7 "Kodiak" Liquid Fueled Engine.


The Cub is in some respects an upgrade to the Mk-55 Thud. For its size, the Cub has relatively good Isp and extremely good TWR, more comparable to a size 2 engine than anything else. It also features the highest gimbal range in the game. The trade-off is in the greater relative and absolute cost, and position several nodes farther up the tech tree.

Product description

Mew! These little vernier engines have a huge deflection, but can only gimbal in one dimension.

Reaction Systems Ltd


Real-world comparison

The RV-1 was inspired by the Russian RD-107 engine but made it recognizable as part of a R7 rocket.


  • Moved tech from Heavier Rocketry to Precision Propulsion
  • Increased unlock cost from 3000 to 3200
  • Decreased cost from 1000 to 800
  • Increased crash tolerance from 6 to 7
  • Decreased Vacuum thrust from 40 to 32
  • Improved ASL ISP from 270 to 280
  • Decreased Vacuum ISP from 320 to 310
  • Added ModuleTestSubject
  • Initial Release