There's a definite lack of Russian engines in KSP. Apart from the Kodiak and Cub there aren't really any. That's a shame because Russian engines are some the best looking and best performing of all. Here's a few I think would make great additions to KSP.   1. RD-170. This is the most powerful rocket engine in the world, and it baffles me how there isn't an equivalent to it in KSP.  For thrust we could be looking at around 2300-2400 kN. Size would be 2.5m.   2.