🔥 Flame-Free, Safe for Education & Demonstration Operates with low-temperature heat sources (80–120°C), requiring only hot water—no open flame. Ideal for classrooms, physics labs, and STEM hobbyists seeking hands-on thermodynamics experiences. 🛠️ Precision Alloy Build & Efficient Heat Transfer Features an SUJ alloy steel power cylinder (±0.005mm tolerance) and 105×105mm aluminum base for optimal thermal conduction and stable low-RPM rotation—perfect for long-term mechanical research and engineering tests. 🔄 Dual Flywheel for Smooth Motion Dual-flywheel design improves inertia and balance, resulting in ultra-smooth motion and visible flywheel mechanics—ideal for science fair displays and motion demonstrations. 🎓 Compact Size, Big Educational Value Measuring 140×105×105mm, this portable Stirling engine fits effortlessly into classrooms, workshops, or home research spaces. A meaningful and premium gift for engineering learners and science lovers. ✅ Easy Operation, No Electricity Needed Simply pour hot water into the base and watch the engine run—no batteries, no wires. Showcases external heat-to-motion conversion with 100% natural energy for physics demos and educational fun. Discover how heat becomes motion with this low temperature Stirling engine model. Using only a hot water cup or candle, it transforms external heat into rotary energy through a flywheel and precision piston mechanism. Whether you’re a science teacher, a parent exploring STEM education, or a curious engineer, this Stirling engine makes physics both visual and fun. No electricity, no motor – just clean energy demonstration with elegant engineering. The glass cylinder, flywheel, and smooth rotation bring mechanical beauty to your desk, lab, or classroom. An excellent gift for students, engineers, and science lovers who appreciate free energy, zero emissions, and mechanical design. Simple to use. Fascinating to watch. Real engineering in motion.