That Balsa USA Northstar is a cool design! I'm sure you'll have a blast flying it. Using a 3-blade prop to overcome clearance issues is usually quite helpful. I've flown 3-blade props for the same reason on my Tiger Stick .40, and always liked the way it flew with the 3-blade.

Most folks think that 3-bladed props are less efficient than 2-bladed props, but I had a guy with a PhD in physics who used to work for NASA write me a four-page long proof about why 3-bladed props are better. I don't care either way really, I'm just happy to be flying.