Why didn't Leonardo build the Ariel screw?

Leonardo da vinci designed the aerial screw, a conceptual flying machine, but it was never built due to several practical limitations. The technology and materials available during his time were insufficient to create a functioning prototype. Additionally, the design lacked a clear understanding of aerodynamics and propulsion, which would have been crucial for flight. Ultimately, the aerial screw remained a visionary idea rather than a realizable invention.