Calculation tools for gravitational assists? Multi-assists?

[herbal space program]

Hello all,

I've got an SSTO that I fantasize I can get all the way to Laythe landing and back without refueling, but I will need to use every gravity assist trick in the book to get there with enough fuel. I tried for several hours last night to work out a Kerbin-Eve-Jool or Kerbin-Eve-Kerbin-Jool slingshot maneuver, but was unsuccessful. Has anybody out there posted a calculator for this or even some kind of primer on gravity assists in KSP? Even a list of how much deltaV you can milk out of various bodies would be very helpful. For example, what is the best boost that you can get off of a prograde Munar slingshot? Does it even help you? Does dividing your ejection boost between Kerbin periapsis and your Munar periapsis gain you anything? Etc. Etc. TIA for any help!

[Rhomphaia]

Trajectory Optimization Tool sounds like what you are looking for.

[herbal space program]

Thanks! That looks like a good start.

[A_name]

Hello all,

I've got an SSTO that I fantasize I can get all the way to Laythe landing and back without refueling, but I will need to use every gravity assist trick in the book to get there with enough fuel. I tried for several hours last night to work out a Kerbin-Eve-Jool or Kerbin-Eve-Kerbin-Jool slingshot maneuver, but was unsuccessful. Has anybody out there posted a calculator for this or even some kind of primer on gravity assists in KSP? Even a list of how much deltaV you can milk out of various bodies would be very helpful. For example, what is the best boost that you can get off of a prograde Munar slingshot? Does it even help you? Does dividing your ejection boost between Kerbin periapsis and your Munar periapsis gain you anything? Etc. Etc. TIA for any help!

Can you post pics of your SSTO? How much DeltaV do you have left after achieving orbit?

[herbal space program]

Can you post pics of your SSTO? How much DeltaV do you have left after achieving orbit?

It's a slight variant of this:

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So far my best deltaV on LKO is around 3600 burning the nuke, which would be 27000 on the RAPIERs burning air. I could get to Laythe easily with that doing a regular Hohman transfer to Jool, but if I want to get back off of Laythe I need to find a cheaper way to do it.

[Red Iron Crown]

Check out this 1051m/s Kerbin-Jool transfer path.