Features: 1. Innovative stirling helicopter model kit: explore the wonders of engineering with our stirling engine helicopter model kit. This unique toy combines the charm of a helicopter with the ingenuity of stirling engine technology to provide an educational and entertaining experience for all ages.2. Interactive learning experience: gain an in-depth understanding of thermodynamics and mechanical engineering principles while assembling and operating a stirling engine helicopter. Through hands-on construction and operation, this kit provides a fascinating way to learn about energy conversion and propulsion systems.3. Durable and safe structure: the product is made of high-quality and safe materials to ensure durability and peace of mind during use. Each component is designed to withstand hours of exploration and experimentation.4. Easy-to-follow assembly instructions: enjoy a worry-free build, unleash creativity and imagination, and develop independence and problem-solving skills with the detailed assembly instructions included in the kit.5. Creative gifts: experience the thrill of simulated flight and the wonder of stirling engine technology with our model kits. This is the perfect gift for aspiring mechanical engineers, curious minds, and aviation enthusiasts. Specifications: material: aluminum alloy stainless steel brass walnutcolor: as shown in the pictureproduct form: kit component versionproduct weight: 400gproduct size: 250*135*140mmwear-resistant glass piston d...