An easy-to-build flying machine with an idle top propeller would likely be a gyrocopter (or autogyro). Gyrocopters are lightweight, simple aircraft that utilize a free-spinning top rotor (which is not powered) to generate lift, and a rear-mounted propeller (powered) to provide thrust.
The main rotor on a gyrocopter works passively, meaning it rotates through autorotation as the aircraft moves forward due to airflow, like a windmill. This greatly simplifies construction and operation compared to helicopters, where the top rotor must be actively powered and controlled.
Here are the key reasons why a gyrocopter is considered the easiest flying machine with an idle top propeller:
Simplified Rotor Mechanics: Since the top rotor spins freely without being powered, you avoid the complexity of engines or transmissions driving the rotor.
Forward Thrust Propeller: A separate engine (often placed at the rear or front) powers a standard airplane-style propeller for forward motion, similar to a small fixed-wing aircraft.
Low Cost and Simplicity: Gyrocopters are often smaller, lighter, and cheaper to build or buy compared to helicopters. They are also popular in ultralight aviation circles.
Stable Flight: The autorotating rotor provides excellent stability and glide characteristics even if the engine fails, which makes it safer and more forgiving for beginners.
DIY Potential: Gyrocopter kits are widely available, making it feasible for aviation enthusiasts to construct them without needing highly specialized tools or engineering knowledge.
For someone seeking the simplest flying machine with a top rotor that idles and spins passively, a gyrocopter is the most practical and accessible option.
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