My most efficient (stock!) Joolian round-trip rocket...

[zombiphylax]

I finally had time to tinker, and this is my (stock! I forgot to mention in the title, this is all stock!) product.

The Jool-X will get you to the Joolian system, with just enough fuel to return. Unfortunately, there's not enough delta V to land on a Joolian moon and return, but it is enough to do a site-seeing trip.

Here's the .craft file. I'd recommend using MechJeb, honestly, just because there isn't much fuel to spare for the common pilot!

Edited October 9, 2012 by zombiphylax

[souza]

Great design, like the wall of spikes on first stage xD

[zombiphylax]

Hah! Thanks! I was trying to make it work without the aerospikes, just because they're a tad overpowered at the moment, but the conventional LFEs just didn't have quite the oomph to get everything into orbit. You can easily use just the design of the middle stack with a lighter orbiter design for a simple and reliable LKO delivery vehicle too!

[Giggleplex777]

They're not overpowered, what are you talking about?

NOOOOOO!!!! Don't tell the devs that! I like the aerospikes just the way the are.

[zombiphylax]

I'm just saying, for something that has a description about trading weight for fuel efficiency, it's pretty light...