I don't think you're going at this a very good way. Flying a jet unmanned is NOT a good idea. If it crashes there is just too much of a risk of a fire etc.
Also, a BASIC Stamp is really, really slow. If you use Atmel AVRs (which are much cheaper, ~$5, and much much more powerful) you can get GCC, a C compiler, for free. BASIC is easy to learn & use, but is not intended for such a complicated project.

These sites have some info about hobbyist UAVs:
http://autopilot.sourceforge.net/ - a helicopter that has hovered succesfully (by itself). Code & PCB schematics are available.
http://www.auav.net
http://members.shaw.ca/sonde/ - this one is carried up tail-first by a weather balloon then glides back down (really! you have to see this one.)

OK I think I got the links to work now [img]i/expressions/face-icon-small-smile.gif[/img]