The polymath thought that if a screw-like structure can rotate fast enough, it will 'drill' into the air and fly.
The design for the armoured car features the most important military requirements: reliability, portability and great firepower.
Leonardo based the design of the flapping wing on birds' wings and a faulty hypothesis.
Leonardo was not only a master artist, but also an accomplished military engineer.
The aim of this extraordinarily complex study was to mimic the different phases of the flight of birds.
Leonardo also designed a wide variety of artillery weapons.
The mechanical wing is one of the masterpieces among Leonardo's sketches related to aviation.
Karaliai Darijus ir Kserksas Persijos armijos reikmėms per Bosforo sąsiaurį statė pontoninius tiltus.
Types of bridges include beam-, arch-, suspension-, cantilever and truss bridges.
Pakabinamas tiltas, kuris driekiasi virš sąsiaurio tarp San Fransisko įlankos ir Ramiojo vandenyno, buvo atidarytas 1937 m.
The Széchényi Chain Bridge, named after István Széchenyi, was the first permanent bridge across the Danube between Pest and Buda.