Hey, thanks for your reply. I wish I could tell you more, but let's just say it's "home-built." It's a school project and we have an experienced pilot on our team, and all of us have some pretty significant background in aircraft design.

I guess I should have put this in the fuel engine section, but I saw beginner and thought I should go there. Perhaps if someone could move this thread for me, that would help.

If someone would be able to explain the effects of changing the propeller size and pitch, perhaps I could figure out what I needed. I read in another thread that decreasing the prop diameter would increase the ability of the engine to spin it at a higher RPM. Same goes for decreasing pitch: gives faster RPM. Does this faster RPM mean I'd be getting more thrust/pulling power out of the prop?

How does going with a larger prop or higher pitch effect the thrust? Would a larger prop mean it can pull more air, therefore more power? Would higher pitch also mean the same thing?