You could do aerobraking in Jool's atmosphere or at Laythe to reduce your dv requirements considerably. You can use gravity assists from other moons to alter your course. There is however a LOT of variation possible. Then work your way back down the Dv tree for each of your other destinations. For example:ģ400dv to launch into Kerbin orbit + 950 to reach the edge of the Kerbin system + 980 to get a fly-by of the Jool system + 270 for a mid course inclination change + 160 to capture into high orbit of Jool + 620 to get a fly-by of Vall + 910 to get into orbit around Vall + 860 to land on Vall + another 860 to take off from Vall again + another 910 to escape Vall's orbit + another 620 to reach a high orbit around Jool again. Ideally, you add up all of the numbers between your starting point and your end point, remembering to add extra for any inclination change corrections you might need (typical inclination change amounts are listed next to the colored bar.) And also add the numbers again if you have to retrace your steps.
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