I feel like i ought to clarify things a little bit. I am an aeronautical and astronautical engineer at my school, and a group of us have gotten together to compete in a nationwide competition among colleges. We dont have any experience in building RC planes, so this is a huge learning experience and we dont expect to do everything right the first time. This competition involves heavy lifting and we are limited to electric motors, hence the large prop. i am not going to go into much detail about our design (just in case any other teams happen to monitor this board) but i can say that we will be doing analysis on everything that goes into it, both mathematically and through wind tunnel testing. Thanks for all the help so far, and you will probably be hearing from me again.