A popular YouTuber has created the first working lightsaber that uses propane gas burning at around 4,000 degrees Celsius to generate a retractable plasma beam. Canadian James Hobson, known as "Hacksmith," has 10 million users and is dedicated to bringing science fiction to life. Invention of a retractable and Star Wars lightsaber Inspired by his love for Star Wars, he has created a variety of lightsabers, but he wants to create "the world's first retractable plasma" version. To do so, the Internet-famous engineer used liquefied petroleum gas (LPG), a fuel hidden in many sheds and often used to power barbecues. Housed in a custom-made backpack and piped to the device, they are more like early "primitive sabers" than the weapons used by Luke Skywalker and Obi-Wan Kenobi. Hobson said that these backpack-less designs are currently outside the scope of our technology because they require D-cell batteries that ca