Tomahawks are simple but effective hand-to-hand combat weapons, still used by the elite U.S. Army Rangers, but for the average person they can also be used fruitfully for yard projects like trimming limbs or chopping kindling wood. Here is a guide to building your own throwing tomahawk, roughly based on the U.S. Army Rangers model.
Step 1: Find some scrap steel
Find some scrap steel between 3/16 and 1/4 inch (4.7mm to 6.35mm) thick, and at least 4 inches by 5 inches (10cm by 12.5cm) in size. You may find some in a junkyard or salvage yard, but it is also sold at industrial supply stores. Make sure it is not too heavy, but not too light that you cannot build up speed while swinging