Good tips. I like the idea of using a pusher setup with a three bladed prop. I have a TT .42 on it, what would be a good three bladed prop? The 10X6 two bladed prop that I have on it works well. The shrike I have already has rudders on it, but the servo for them is on the bottom of the plane. I'll have to move that inside too. I can just extend one of the rudders down for a water rudder. Where do you think I should put the engine? I think on the Northstar the prop disc is right above the CG. Is that right? Is that where I should put this? I'm not going to start this project until its too cold to fly, but thanks for the tips. It will make things easier when I do start in on this.