I need to contact who ever would be authority on propeller design and applications. In short, the Idea is to build a Aluminum prop, 1.2 meters diameter with weight of about 1000 grams. Targeted application would be primarily for powered para gliders. I need some arguments for and against before it leaves blueprint stage. If you can point me in the right direction as to who the best contact for me would be, I would be ever so grateful. If any of you have experiance on the issue, comments are more than welcome.