Thank you for downloading the SF2000 Preview and giving it a try.
This is an early, simple Preview so there isn't a lot of stuff going on yet. You can get familiar with how the aircraft fly, check out the "Island World", take off and land, and shoot down the other non-aggressive aircraft.
Most of the programming in SF2000 is finished, but a lot of the 3D graphic data is still being completed. So if you see something that looks a bit rough or incomplete, then it probably is incomplete and is still being worked on.
SF2000 requires a PowerMac, RAVE, and a 3D hardware accelerator. (Any current Mac satisfies these requirements.) Works best with ATI brand 3D accelerators.