This from the spacebombardment blog
Payload Fraction
Advanced Interplanetary Orion 10,000 tons
one) 61% 6100 tons to orbit
two) 57% 5700 tons to Lunar landing
three) 53% 5300 tons to lunar surface and back
four) 53% 5300 tons to mars orbit and back
five) 45% 4500 tons to Venus orbit then Mars orbit then Earth orbit.
six) 13% 1300 tons to Enceladus and back
Shuttle – Cargo 1.6% (LEO) to 0.8% (ISS)
ISP Hours ISP seconds
AM-Beam MAX 2,834 10 million
H->Fe Fusion MAX 1,417 5.1 million
H->He Fusion MAX 850 3.1 million
IC-Fusion MAX 283 1 million
ORION MAX 278 1 million
NSWR 90% UTB MAX 133 479,000
AIM 17 61200
mag Orion 8.2 30000
VASIMR (high gear) 8 28800
Mini-Mag Orion 6 21600
ORION Low Altitude 4 14400
Space Shuttle x3 SSME 0 455
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