AAWSAP DIRD, Aneutronic Fusion Propulsion I, November 2010
DOW-UAP-D145 · page 41 of 50
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-- I I -) ./'/ - - --- l,_.....---"'" ~L---1 I 0 UNCLASSIFIED//POlt Offl@IAL HS& QptkY Figure 13. Maximum Achievable Velocity Versus Fuel Usage. c:: 0 ·p Cs:! 0 .9 .... Q) Q) u 0.8 ---------------------------------10.s ~ ca 0.7 c:: 0 ·.c Cs:! 0.6 ..... 0.6 ·;;:: ~ 0.5 0 -"' /\ ., 0.4 0.4 t µ.i \ .§ 0 ---- Cl 0.3 0 E-< ·p Cs:! 0.2 0.2 .... Q) Q) u 0.1 u <r.: -~.....___.___ ___.____.___.....____......__ __...____.____.__ ___.o 0 0 5 10 15 20 25 30 35 40 45 50 Time (years) Measured in the Ea1th Reference Frame Figure 14. Acceleration and Rocket "Clock" Ratio versus Mission Time on Earth. Another item to consider is the value chosen for the constant acceleration of the spacecraft. We cannot exceed 1 g for crew safety, yet higher accelerations mean 33 UNCLASSIFIED/fF&A 9FFI€il.t.k Y&li QptkY t:: '@) 0.9 ;.:3 '8 08 "8 g_ 0.7 U') 0 0. 1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Mass ofFuel Consumed / Total Initial Rocket Mass