Mission to laythe advice

[Mait3rz]

Hey guys was just wanting some advice, I'm about to launch a manned mission to laythe and was wondering how much delta V I would need to make it back? I don't need to land on the moon and take back off as I'm leaving a probe on the moon and a science station in orbit. The vehicle I'm using would need to re-establish a stable orbit around kerbin too as its re-usable. Also if I was going to mine one of jools moons which one would be the best to bring ore to laythe orbit?

My current craft has just short of 7000 delta V and would be more efficient after releasing its payload.

Thanks

[cybersol]

Time for a deltaV map. From the one I have handy:

On the way there:

3700 (LKO) + 950 (Kerbin ejection) + 980 (Jool intercept) + 930 (Laythe Intercept)

The below can be mitigated down to almost nothing by the right timing and aerobraking:

270 (inclination) + 160 (Jool capture) + 1070 (Laythe orbit) + 2900 (Laythe landing)

On the way back:

2900 (Laythe launch) + 1070 (Laythe ejection) + 930+160 (Jool ejection) + 980 (Kerbin intercept)

Can be mitigated by timing and aerobraking:

270 (inclination) + 950 (Kerbin insertion)

Plus you should take 20% extra dV because stuff happens and things are not always perfect. Maybe more if its your first time. Total for full landing and return with some wiggle room is much closer to 15k dV than the 7k dV you listed.

Gravity assists could significantly reduce a few of these, at the expense of flight time and planning.

Edited May 31, 2015 by cybersol

[Ferdoni]

+ 2900 (Laythe landing)

Since that there is an atmosphere on Laythe you can use parachutes instead of using faaaar too much delta v on landing

[cybersol]

Since that there is an atmosphere on Laythe you can use parachutes instead of using faaaar too much delta v on landing

Yeah, and you can use them and aerobraking to get rid of almost all the 1070 (Laythe orbit), which is what the line above that says! Its the whole reason those values are on a separate line than the other ones for getting to Laythe.