>Dragan,
>
>That's sort of suprising, back in high school I'd read that the jet engine is the second most efficient means to transport mass, it's only beaten by a bicycle. That statistic might have changed in the last 30 years though.

I've found that somewhere in one of Arthur Clarke's novels, maybe the "Fountains of Eden" (or so), but it was rocket-propelled-in-vacuum vs bicycle.

For a jet, it still has to work a lot against gravity etc.