PEEPER on Instagram: "This video shows a homemade jet-style engine being tested on a small boat, using a gas cylinder as a fuel source. The setup resembles a pulsejet or ramjet concept, where combustion creates thrust by expelling hot gases out the rear. While the physics behind jet propulsion are real, this type of DIY build is extremely dangerous. Improvised fuel systems, lack of pressure control, and no proper heat shielding can easily lead to explosions or fires. These engines also produce i