I don't think you can look at propulsion without efficiency. The power plant and fuel (for cruises of days or weeks) will overshadow the pricetag of the propulsion.
As far as VE goes, TL7 hydrojets are less power-efficient than regular or ducted screw propellers of the same TL (less thrust per kW), and just as efficient as light propellers (which are both lighter and cheaper). The ducted propeller is superior to the regular propeller, but it is more expensive as well. However, the development of screws tops out at TL7, since TL8+ systems use the same stats. Hydrojets and MHD tunnels improve from TL7 to TL8, and they improve past the unchanged screws. Conclusion: At TL7, the ducted screw wins. At TL8, hydrojets are the system of choice. _______________________________________________ GurpsNet-L mailing list <[email protected]> http://mail.sjgames.com/mailman/listinfo/gurpsnet-l
