I said osage is number one for a selfbow, meaning an unbacked bow. The ipe, beefwood and purpleheart bows that I made were backed with hickory and they made fine bows but I just enjoy building selfbows more than backed bows. I guess they would probably work as an unbacked bow if you found a knot-free board with straight grain. Osage likes to be bent, it bends easily with heat, scrapes easily, it is very forgiving of mistakes during tiller and is very available where I live at. The tropical woods are a beast to bend with heat, hard as a rock to scrape or sand and they are very expensive to buy at a lumberyard.