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If we achieve advanced nuclear, antimatter propulsion or other advance propulsion it would be possible to achieve near constant acceleration. This would enable travel times to Mars in the 3-8 day range depending upon where Mars was in its orbit relative to Earth. This would be with constant 0.33G acceleration and deceleration.
A Hohmann orbit is the maximum transit time / minimum deltaV mission. Weak spacecraft use this because they do not have a lot of deltaV. All current space probes use Hohmann because currently there ain't no such thing as a strong propulsion system.
A torchship is a spacecraft with more than 300 km/s total delta V and an acceleration greater than 0.01 g.
Performance:
Exhaust velocity: Approximately 20–60 km/s, depending on the design (e.g., specific impulse of ~6,000 seconds yields ~59 km/s).
Thrust: Extremely high due to the explosive force, enabling accelerations well above 0.01 g (potentially up to 1 g or more, though typically lower for crew comfort).
Delta V: For interplanetary missions (e.g., Mars in 125 days), delta V is in the tens of km/s, but interstellar designs (e.g., Freeman Dyson's analysis) suggest velocities up to 10% of light speed (30,000 km/s). With a mass ratio of ~160, a delta V of 300 km/s is feasible, though it requires significant propellant.
Fit for Torchship: Meets both criteria handily, supporting Brachistochrone trajectories (continuous acceleration to midpoint, then deceleration).
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