KUMA is T4i's bi-propellant propulsion family, combining 90-95% hydrogen peroxide with kerosene-type fuels. Thrust ranges from 1 N to 500 N across configurations scalable to a few kilonewtons, with specific impulse above 270 s at smaller scale and above 300 s at larger scale.

Systems throttle across a 1:10 range, support multiple restarts and more than 100 seconds of thrust time, and serve orbit raising, station keeping, deorbiting and repositioning. T4i positions KUMA against hydrazine-based units and develops complete customized propulsion modules to customer specifications.