He designed and printed a very simple propeller, which he intended to power with a brushless ... his battery-powered drill instead. For the shaft tube, he modified an old crutch by drilling ...

More efficient and easier-to-use power drills tackle these jobs now ... It’s the one you need for heavy-duty work like ...

Rotary hammer drills blast through concrete, stone, and masonry with percussion-driven force, making them essential for heavy ...