# DG Technical Specification

Thrust rating | Flight model
--- | ---
easy | complex
Main thrust [kN] | 2 x 180 | 2 x 150 (vacuum) 2 x 120 (1 bar)
Retro thrust [kN] | 2 x 34 | 2 x 34 (vacuum) 2 x 27.2 (1 bar)
Hover thrust [kN] | 3 x 83.3 | 3 x 66.7 (vacuum) 3 x 53.3 (1 bar)1
ISP [m/s] | 4·104 | 4·104 (vacuum) 3.2·104 (1 bar)

1) Requires total mass < 16300kg to allow vertical liftoff from Earth's surface.

Mass |
--- | ---
Empty mass [kg] | 11.0·103
Main tank capacity [kg] | 10.4·103
RCS tank capacity [kg] | 600
Scramjet fuel capacity [kg] | 3.0·103
Max. takeoff mass [kg] | 25.0·103