@roddy_fcts: It looks like these blades should collide on the very first rotation. But they can't. This is a synchropter — a twin-rotor design where the blades pass through each other. One gearbox. Rigid synchronization. Zero chance of collision. No tail rotor means every horsepower goes to lift. The K-MAX lifts 2,700 kg — more than its own weight. What engineering anomaly should I break down next? 🚁 #facts #aviation #engineering #physics #helicopter