Table V. Mars surface exploration mission—nuclear thermal rocket (NTR) propulsion Mars evolution mission #2 (manned)—NTR Orbital sequential weights/performance Parametric sizing of stages, brakes Status date: Jan 26, 1989 Trans Mars injection stage—NTR ISP (sec): MPS: 756.0 RCS: 220.0 B/O rate (kg/day): 14.8 Reserves (%): MPS: 2 RCS: 10 Stage: 47 933 (Propuls only) Brake: 6482 Tankset: 64 279 MPV: 99 377 MCSV: 177876 MCL: 89 975 Total Mars P/L: 367 227 Sequential weight Delta V (M/S) Time MPS fluids RCS — Mission event MPS RCS days boiloff Nominal fluids other kg lb Leo departure 896 214 1975 792 MPS earth escape 3880 0 5 -74 -365145 0 -365219 -805162 Drop tankage 0 0 0 0 0 0 -64 279 -64 279 -141 709 Detach Mars piloted vehicle 0 0 0 0 0 0 -99 377 -99 377 -219087 Detach MCSV 0 0 0 0 0 0 -177 876 -177 876 -392 145 Detach MCL 0 0 200 -2961 0 0 -89 975 -92 936 -204 886 Mars aeromaneuver weight 96 529 212 809 MPS post aero correction 15 0 0 0 -195 0 -195 -430 On-orbit staytime 0 0 365 -5404 0 0 -5404 -11913 Rendezvous with MPV 0 0 0 0 0 0 73 679 73 679 162 432 MPS Mars departure 1170 0 0 0 -24031 0 -24031 -52 980 Detach MPV 0 0 200 -2961 0 0 -73 679 -76 640 -168 960 Earth aeromaneuver weight 63 939 140 959 MPS post aero correction 200 0 0 0 -1702 0 -6482 -1702 -3752 Less aerobrake 0 0 0 0 0 0 -6482 -14291 MPS reserves 0 0 0 0 -7821 -7821 -17 243 End of mission, excluding reserves 47 933 105 673 Total 5265 0 770 0 -11399.2 -391073 0 0 -445 810 Fluid reserves -7821 0 Total usable fluid weight—kg | -410294 [ 1___ 0___ 1 Continued on p. 300
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