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In my latest career mode game I am planning to start a Laythe colony. I am using MKS and USI Life Support, with the lowest levels of Interstellar Extended's power and propulsion tech unlocked. In short, no transit times to Jool that would be less than two years or so, at least while carrying a reasonable (30+) number of passengers per trip. I plan to use the Cycler to only carry colonists, building more as time goes on to eventually have a voyage every year or so. Cargo deliveries can be done with traditional Hohmann Transfers. Unfortunately my math and coding skills are not up to the task of determining masses and orbital parameters for this vehicle. I am hoping you nice folks can help me figure these parts out. My questions are as follows: 1. How many ships would be needed for one to arrive at Jool every year? 2. What would be the parameters of the Cycler's initial orbit? 3. How much Delta-V would I need for course changes, ideally or worst case, per trip? Could I use the Joolian moons to reduce this? 4. Is there a more resource-efficient way of doing this cost-wise? I figure that the Cyclers will pay themselves off within two or three voyages because the fuel and construction costs to carry the supplies and crew would be far greater for a similar ship that had to decelerate at either end of the voyage. Once I unlock the more powerful fusion drives this design will be obsolete, but in the interim I have contracts to do things near Jool, and I want to simulate the rotation of specialist personnel that such a facility would experience. As for off-world infrastructure, I currently have a mining and science base on both the Mun and Minmus, a big orbital fuel processor around Minmus, Science/tourism station orbiting the Mun, a science base on Duna with a fuel plant on Ike, and a fuel depot in Geosynchronous orbit over Kerbin, with smaller tugs to carry fuel to crafts in LKO.