/sci/ - Science & Math

>>16209843
Pretty close, starship with no cargo has about 8km/s deltaV.
It takes 5.4 km/s to get into neptunes capture orbit from a direct burn from earth. So starship can do it.
Assuming I'm reading these charts right anyway.

>>15427577
I don't think you understand how wild it is to reach Mars in 39 days with electric propulsion or what it would mean for other planets which are substantially harder to reach as the dV required for just a basic Hohmann transfer pushes the limits of chemical propulsion. This would only benefit in that instance, it wouldn't need to accelerate as rapidly, the power requirement would drop significantly, it would gain more dV or payload. The result would be years being cut from the length of the trip.
>>15427664
You want fuel commonality, you want it to carry around 100t of propellant, and you want to maximize the amount of volume left over for payload. Any hydrolox stage is out of the question but Centaur III does technically fit.