Leonardo da Vinci developed concepts for a giant air screw late in the 15th century. This working model uses a bevel gear, also from his drawings, to spin the canopy and support structure, illustrating the way Leonardo thought flight might be possible. A fun and inspiring project from one of the greatest minds of history. Easy to make from pre-cut and pre-drilled sustainable timber. Finished model size is 38cm high by 23 cm wide. While today's scientists believe the design wouldn't fly, this model is a realistic scaled representation of his design. It also integrates well with figurines and can be painted or oiled. A fun and inspiring project from one of the greatest minds of history Easy to make from pre-cut and pre-drilled sustainable timber Finished model size is 38cm high by 23 cm wide While today's scientists believe the design wouldn't fly, this model is a realistic scaled representation his design It also integrates well with figurines and can be painted or oiled