Boring the Prop Shaft Hole Unicorn will be moved thru the water with a propeller powered by an inboard electric motor. While the drive system layout uses modern components, boring the prop shaft hole was done with very low-tech tools. (Yes, I'm skipping over the fiberglassing effort for now because a)it's not quite done yet, and b)it looks awful. 😕 More on that in the next post. ) Here's a picture of the tools used to bore the prop shaft hole. The thing in the foreground is a modern version of an ancient hand drill, a Brace (sometimes called a Carpenter's Brace). This simple tool can produce the large twisting force needed to turn the 7/8" diameter auger bit I used. The picture is from after the hole was bored, but you can see extending out of the Brace is a 24" drill extension. The 17" auger bit in this picture is already completely inside the keel and hull. Here's the setup of the process. The goal is to bore the hole exactly down the center of the...