Responding to questions:

>...could you do the aerocapture in
>multi-steps?

Yes. Multistaged heatshields have been used in the past (Fire-II). Heatload is the big problem with aerocapture. The idea is to take the heatload in an outer shield that is separated by an insulating layer. Blow the first heatshield off and expose the next heatshield down. Continue as required.

>The first step would be to use
>resistance of Titan's atmosphere to
>help to capture the spacecraft into a
>Saturn-orbit.

It makes sense to aerocapture Tian's atmosphere to Titan orbit. Saturn also has an atmosphere and Titan is far from Saturn.

>Dunno how much energy you have to lose >to orbit Saturn, and how much Titanian >atmosphere you can plow through.

Lots! Typical entry speed to Titan is 6 km/sec while typical orbital velocity around Titan is 1.4 km/sec. Energy scales as velocity squared so we're talking about lots of energy being dissipated into Titan's atmosphere (that's why aerocapture works so well for this case).

Gary