Easiest way to race with other people is to join the official UHL server 'www.uhlhydroplanes.com'. I believe there is a way to set up your own server but it's a hassle and above my skill level.
Best posts made by DJ-Miller
RE: System Requirements?
It might be worth while taking some sort of survey of the regular players to see what their specs are and what frame rate they get. Maybe then we could get a better idea of what it takes to currently run the game well beyond the vague "decent gaming PC".