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The fission thrust sail as booster for nuclear fusion-based rocket propulsionfor future starships is studied. Some required aspects of these systems such asneutron moderation and sail regeneration are discussed. First ordercalculations are used together with Monte Carlo simulations to assess systemperformance. When the fusion rocket has relatively low efficiency (~30%) inconverting fusion fuel to a directed exhaust, adding a fission sail is shown tobe beneficial for obtainable delta-v. Also, this type of fission-fusion hybridinterstellar propulsion has the potential to improve acceleration. Otheradvantages are discussed as well.

Fission Thrust sail as booster for high {\Delta}v fusion based propulsion