How to do Non-hohmann transfer?

[enroger]

So I want to send something from Mun to Minmus fast, the usual Hohmann transfer (takes about 300m/s) takes about 24 days, but I want it there in less then 10 days and have tons of dV to spare (>1500m/s). But after a long time tweaking around with the maneuver node I'm still having trouble getting an encounter with Minmus, any tips?

Edited May 12, 2015 by enroger

[Tripod27]

Having trouble getting an encounter at all or having trouble getting a fast encounter?

Maybe send some pics of the problem node?

[AlexinTokyo]

I'd recommend alexmoon's KSP transfer window planner, or TriggerAU's ITWP mod (which is basically an in-game implementation).

Both of these can generate 'pork-chop' plots for Mun-Minmus transfers, which will allow you to find the correct ejection angle at which to start burning for any given transfer (including high-energy, non-Hohmann ones)

If you have trouble using those tools, post back here and I'll see if I can help.

[enroger]

Having trouble getting an encounter at all or having trouble getting a fast encounter?

Maybe send some pics of the problem node?

I can get an encounter at T-24 days, but that is too long for me. So yeah I can't get a fast encounter. I was trying to increase both radial and pro-grade velocity to get a fast encounter, and increase normal to match inclination. To get fast encounter I'd probably have to get it into kerbin escape trajectory, but I can't find an encounter with that.

I didn't save the game at that time so no picture yet, I'll try to get picture when I attempt it again....

[n0xiety]

You can go easy and try mechjeb. It has an advanced transfer option where you can choose between asap and minimal dv usage transfers. It will show you a graph with how many days it will take and how much dv will be used. You can choose at any point you like to on the graph and leave the burn to mechjeb.

[enroger]

Thanks everyone! Problem solved, got transfer window planner. Turns out I need to burn retrograde to Mun's orbital velocity, felt stupid to not tried that the first place. Took 700m/s and encounter in 2.5 days, Rocket to Minmus!