[Space/Spaceships] Getting the velocity/Delta V I want with the tech I want

[Humabout]

As promised, Numbers! For lack of better data, I used an initial orbit of 1 AU and a final orbit of 400 AU. If you give me more exact figures, I can give you better information back.

Assuming you achieve a top speed of 300 mps, as you stipulate, you will need about 600 mps worth of delta-V and be capable of about 0.0004 g acceleration. The trip will take you about 8 years - not 4.

Various launch windows will occur about once an earth year, assuming the primary is about one solar mass.